bluuebunny/crossref_metadata_2025 huggingface dataset:
Comprehensive Effect of the Property Indexes on the Saturated Original Loess Liquefaction
Authors: Wang Qian , Wang Lan Min , Wang Jun , Ma Hai Ping , Su Yong Qi
Published: November 2012

In this paper, the effects of the main property indexes on the saturation original loess liquefaction is analyzed through the dynamic triaxial test by using the WF-12440 testing system, combined with the experimental results, the influence of density-grain degree coupling on saturated loess liquefaction is comprehensively analyzed. The result shows that the influence of density-grain degree coupling on saturation loess liquefaction has a feature of segmentation, plastic index plays the main role for loose loess, whereas density is the main control factor to dense loess; Moreover, the influence of density-grain degree coupling on saturated loess liquefaction controlled by cyclic numbers of the vibration, plastic index plays the leading role while the vibration times is small, while the more vibration times, the bigger density and higher strength of liquefaction.
The Review of Experimental Studies on Non-Coaxial Soil Behaviour Using HCA
Authors: Cai Yan Yan , Yu Jin , Yang Lin Tao , Mu Kang
Published: November 2012

Non-coaxiality has been recognized as an important feature of grain materials in geotechnical engineering. Without considering the non-coaxiality in structure design will lead to an unsafe result. Studies on the non-coaxial soil behaviour have been carried out both using numerical simulation and experimental testing by several researchers. To discuss the non-coaxiality of sand, it is essential to carry out tests under various stress paths. HCA is a valuable device to investigate the soil behaviour under various stress paths. In this paper, a review of the experimental work on non-coaxial soil behaviour especially using HCA is presented to help the understanding of both non-coaxiality and the use of HCA.
Ground Behaviors due to Seepage Force of Groundwater
Authors: Meng Ling Yu , Yamamoto Haruyuki
Published: November 2012

Well pumping leads to both horizontal and vertical displacement, and fluctuation of groundwater level can cause serious damage to structures in a lagre affected area. Ground behaviors due to seepage force in traditional methods were rarely considered. This paper presents a numerical solution of ground displacement behaviors due to unsteady groundwater flow in unconfined aquifer by considering the effect of capillary zone based on the saturated-unsaturated seepage theory, and the numerical simulation code implemented by FORTRAN is applied to predict the flow velocity distribution and the results of ground displacement. The model uses the finite element method and finite difference method to study the problem. The analysis shows that the seepage force and the effect of capillary zone play a very important role in both seepage flow and displacement field.
Experimental Study of the Rotary Filling Piles with Large-Diameter under the Axial Load
Authors: Zhou Wan Qing , Ouyang Shun Pei
Published: November 2012

Based on the experimental study of rotary filling piles with large diameter subjected to axial load in deep soft soil, the bearing capacity behavior and load transfer mechanism were discussed. Results show that in deep soft soil foundation, the super–long piles behave as end-bearing frictional piles. The exertion of the shaft resistance is not synchronized. The upper layer of soil is exerted prior to the lower part of soil. Meanwhile, the exertion of shaft resistance is prior to the tip resistance. For the different soil and the different depth of the same layer of soil, shaft resistance is different.
Research Status and Prospect of Strain Monitoring Method of Geotechnical Engineering
Authors: Wu Jian Chuan , Hu Xin Li , Sun Miao Jun , Hua Shuai
Published: November 2012

This paper summarizes the importance of strain monitoring, points the characteristics and the main difficulty in strain monitoring of geotechnical. From the current situation in Strain monitoring of geotechnical engineering, it analyzes and summarizes the principle and the practical application of the advantages and disadvantages of strain gauges, fiber Bragg grating and distributed optical fiber. Finally, it designs an overview of geotechnical engineering strain monitoring system, nine principles of strain monitoring system to be put forward, and the direction of geotechnical engineering is the development of strain monitoring system and application.
Numerical Analysis on Loading History Correlation for Large Deformation Control within Deep Soft Rock
Authors: Yuan Yue , Wang Xu Chun , Liu Xin
Published: November 2012

The correlation of the load history in the nonlinear large deformation mechanical design method is discussed. Then the different schemes of support construction process which are used to control the nonlinear large deformation of the east wing main haulage roadway in -1000m level of a certain coal mine are simulated by the program of 3D finite difference. The results show that the deformation results, the displacement distribution characteristics and the stress concentration degree of surrounding rock are significantly different due to the different construction sequence. After plastic large deformation occurs in deep soft rock ,the mechanical response characteristics of the surrounding rock closely related to the entire loading history. And different construction sequence will produce different deformation control effect. Therefore, the use of large deformation mechanical design method for the supporting design of deep soft rock is necessary, then based on the proposing of the mechanical countermeasures the best construction process is determined, and the optimization of support parameters must be for this process.
Evolution Mechanism Study to the Loose-Fractured Rockmasses of Badong Group in Fengjie New Town
Authors: Yang Le , Peng Hai You , Zhou Mo Lin , Yang Jian Guo , Wu Meng
Published: November 2012

The loose-fractured rock mass of Badong formation exposed stratum in New Fengjie county is a typical unsteadiness rock group, possessing unique formation and evolution mechanism of rock mass structure and engineering properties. This paper mainly aiming at the influencing factors such as the tectonic action, formation lithology, the effect of water and so on, analyzes and researches the causes and evolution mechanism of the loose-fractured rock mass of Badong formation in New Fengjie county.
Study on Surrounding Rock Deformation Characteristics and Control Technology in Deep Soft Rock Roadway
Authors: Zha Wen Hua , Hua Xin Zhu
Published: November 2012

To explore support technical problems in deep soft rock roadway, according to deep complicated geological conditions in 102 transport rise of Yuandian Mine, obtaining deformation characteristics of roadway in the initial support scheme under conditions, analysing the reasons of instability and failure of surrounding rock, proposing the surrounding rock control technology of step-by-step strengthen co-supporting, determining secondary anchor cable strengthen support time and grouting delay distance, optimizing the parameters of roadway support. Industrial practice show that the control effect of deformation was obvious,which provide the reference for deep soft rock tunnel support decision.
Influence Analysis of Salt Resource Exploitation on Geological Environment in Huai’An
Authors: Zhang Yuan , Wang Ying Li
Published: November 2012

Huai’an salt mining industry exploitation is introduced in this paper. We analysis the problems and influence factors of geological environment, such as rock-salt cavity roof collapse, the pollution to environment, brine leak and based on huai’an geological structure and the current method of rock salt mining process. In the analysis, the reasons due to the problems is be shown in details. We put forward the corresponding suggestions and countermeasures of prevention and control according to these geological environment problems as the references for related engineering design, construction, operation and environmental protection of the local salt mining enterprise and Huaian bureau of land and resources,. and so on.
Calculation and Analysis of Rock Stress State near the Bit
Authors: Li Wei , Yan Tie , Li Si Qi , Zhang Ling , Xu Xing Hua
Published: November 2012

Underbalance drilling has been applied to each oil field at home and abroad, due to the advantage of increasing the penetration rate substantially, protecting the reservoir effectively and reducing the drilling costs. But in respect of rock stress state characteristics near the bottom, relatively speaking, the study was rarely.Take the borehole near the bottom in underbalance drilling as the research object, analyze the influence of terrestrial stress, pore pressure and fluid column pressure on mechanics characteristic of rock in the bottom, to study the rock crushing efficiency, well deviation and hole stability of non-permeable wellbore and permeable wellbore in underbalanced drilling. The result shows that the mechanical properties of rocks near the bottom are subject to terrestrial stress, pore pressure and fluid column pressure. In non-permeable rock, the rock crushing efficiency, the penetration rate and the concentrated force of well trend to increase, the well trends to inclination. In permeable wellbore, with the permeability increasing, the rock crushing efficiency, the penetration rate and the concentrated force of well trend to decrease, the tendency of inclination becomes lower.
Stress Analysis of Grain Steel Silo with Hole
Authors: Peng Qi Feng , Wang Fan
Published: November 2012

The stress of the grain steel silo is complex. Recently, many grain silos scraped during their service life. The results of finite element analysis by COMSOL show that the cause of the structure failure is the stress concentration caused by the expanding of the hole. Analysis on different hole on the wall of the silo and different frame to strengthen the hole was also studied. Considering the impact of the weight of the structure, the pressure and friction force caused by the storage of the grain and wind load. The analysis turn out that, if the frame of the hole is identical, the stress level and the first principal strain in condition of circular hole is lower than that of rectangular condition, and the maximum vertical displacement of circular hole is smaller than rectangular. In addition, if the hole is the same, the stress level and the first principal strain in condition of U-shaped frame is lower than that of square condition, but the maximum vertical displacement U-shaped frame is bigger than square frame. Therefore, we can’t reduse the stress level by strenthening the frame.
The Overall Stability Calculation Method for Sway Frame
Authors: Tian Wei Feng , Hao Ji Ping , Fan Chun Lei
Published: November 2012

There are three levels in stability calculating for sway frame. The first level is the traditional effective length method. The second level is the effective length method considering interaction of columns in one story and the third level is the effective length method considering inter-story interaction. The traditional effective length method may lead to unsafe design. Using the concept of equivalent negative stiffness, story stiffness to negative stiffness ratio factor and story support factor were proposed. Through the story stiffness to negative stiffness ratio factor, the weak-story and the inter-story support relationship can be found. Then, a formula for calculating the elastic stability capacity of sway frame is proposed, by which the inter-column interaction and inter-story interaction can be considered, and the finite element buckling analysis for stability capacity can be avoided. Through the stability capacity, the column effective length can be calculated. The results show that this simple calculation method has good precision and accuracy, can be used for engineering design and theoretical calculations.
Discussion on Effect Factors and Formula of Bearing Capacity of Reinforced Mixing Pile
Authors: Sheng Gui Lin , Zhang Ya Ge
Published: November 2012

Based on the reinforced mixing pile soil interaction mechanism, the effect of the reinforced mixing pile bearing capacity factors are analyzed; and on the basis of experiment and theoretical analysis the results of reinforced mixing pile with core rate optimal optimum core pile length and ratio; in the analysis of experimental data based on the present, on single pile the bearing capacity calculation formula and puts forward some suggestions.
Finite Element Analysis of Mass Concrete Temperature Crack Mechanism
Authors: Xu Zhi Hua , Sun Da Wei , Xiao Hai
Published: November 2012

With the large-scale continuous development of economic, mass concrete structure plays an important role in the architecture construction field. This paper simulates the mechanism of temperature crack which is caused by temperature stress due to the change of temperature, introduces the generative principle of temperature crack simply and could provide references for control the temperature crack effectively.
Parametric Study of Beam to Column Extended Endplate Connection in Fire
Authors: Wang Meng
Published: November 2012

In this paper, numerical study results using ABAQUS are presents to demonstrate the failure modes and the behaviour of endplate connection with different parameters at elevated temperature. Numerical models and simulation methodology are first validated by the comparison to experimental data. Then the behaviour of beam and the failure modes endplate connection with different parameters- including beam span, beam load ratio, column cross section, endplate type- are studied. It can be concluded that all these parameters has a effects on the behaviour of the connection, while some parameters has a great influence on the survivability of the joint.
Analysis of Failure Mode and Ultimate Bearing Capacity of Steel Truss Coupling Beam
Authors: Qiang Hu , Deng Zhi Heng , Qian Lin , Xu Dong Xiao
Published: November 2012

A calculation model about failure mode and ultimate bearing capacity of steel truss coupling beam is proposed based on compatible distortion and balance conditions, second-order effect, elastic-perfectly plasticity and strain state about eight specimens when these specimens fail under low cyclic reversed loading. And then this model is applied to analyzing influences of height, span and chord stiffness on bearing capacity of truss. Some valuable results are obtained such as advantageous range of span-to-height ratio and influence laws of chord stiffness on ultimate capacity.
Analysis of the Fire-Resistance of Beam String Structure
Authors: Zhang Feng
Published: November 2012

The mechanical properties, such as yield strength, modulus of elasticity of steel cable and its mechanics model were obtained based on the mechanical properties of steel cable under the high temperature test results. Nonlinear finite element numerical analysis method was established based on the time integral effect considering. The characteristics of temperature field distribution, displacement and stress are discussed. The reuslts show that: BSS has better spatial work performance, the weak area of the structure is near the far side, the main reason of large deformation is the reduce of stiffness and strength.
Dynamic Nonlinear Analysis of an Out-of-Code Highrise Building
Authors: Hu Kai , Qu Ge
Published: November 2012

The most common analysis methods of complex high-rise buildings are the response spectrum analysis, elastic time history analysis, pushover analysis and etc. Meanwhile, for the analysis of those high-rises whose height is higher than 200 meters, period is longer than 4 seconds, the dynamic nonlinear analysis would be more accurate. In this paper, the dynamic nonlinear analysis was executed in use of the Perform-3D program. The results show that the maximum top displacement can meet the national codes; most tie beams and the frame beams of the upper structure yielded in the IO~IS stage and parts reached the CP stage; both the laminated columns and the frame columns had a good performance on the shear behavior; and it is also proposed to strengthen the reinforcement at the reducted storeys. By all these above, it can be judged that the structure reached the codes’ seismic performance objectives.
Nonlinear Dynamic Analysis of the Damping Frame Structure System
Authors: Hong Gan , Li Mei , Yang Yi Zhen
Published: November 2012

Abstract. In the paper, take full account of energy dissipation operating characteristics. Interlayer shear-frame structure for the analysis of the Wilson-Θmethod ELASTOPLASTIC schedule, the design of a nonlinear dynamic time history analysis procedure. On this basis, taking into account the restoring force characteristics of the energy dissipation system, the inflection point in the restoring force model treatment, to avoid a result of the calculation results of distortion due to the iterative error. A frame structure seismic response time history analysis results show that: the framework of the energy dissipation significantly lower than the seismic response of the common framework, and its role in the earthquake when more significant.
A Measure to Imitate the Boundary Condition of Local Structure in Modal Analysis
Authors: Song Yu Chao , Yang Biao , Yu Hong Liang
Published: November 2012

The static element in static deformation analysis was used to simulate the boundary condition of local structure when studying the modality of local structure. Using this method, the vibration modality of a beam system and the main engine lubricating oil tank were researched. The results show that the usage of static element in dynamic analysis can solve the vibration modality of local structure accurately, the difference ratio of first order frequency is less than 1/10000 in the beam model analysis, and the modal analysis of main engine lubrication oil tank has a good performance, which is a helpful base for the coupling vibration research in ship structure.
Study on the Treatment Measures of Expansive Rock Slope
Authors: Zhao Er Ping , Jia Xiao Bing
Published: November 2012

Expansive rock is a special gneis with problems, spread widely in our country. Currently the government is carrying on constructions of infrastructure such as railways and transfer project of south water to the north. Such defective rock can disturb the construction process: due to its extreme sensitivity to temperature, humidity and stress field, swell rock has big potential harm to the project construction; a slight change in external factors could bring great damage to the project construction. Based on the analysis of the project characteristics, The thesis gives the treatment measures of expansive rock slope. The study is quite meaningful for the stability of the expansive rock slope.
Dynamic Response of the Glass Curtain Wall of the Cable Truss under Wind Loads
Authors: Liu Ruo Fei , Huang Cheng Wei , Huo Zhi Peng
Published: November 2012

The point-supported cable truss curtain wall is widely applied in today's high-rise construction structural design. The wind load is the main loads which are bore by Point supported glass curtain wall structure. When the curtain wall glass panels are subject to wind load, the panel will transform form surface loads to point load by spider claws passed to the supporting structure. This paper adopts the method of time domain and ANSYS software to analyse point-supported glass curtain wall cable truss structure of wind-induced vibration response.
In-Plane Dynamics of Multilayer A-Type U-Shaped Corrugated Structure Materials
Authors: Liu Yong , Sun De Qiang , Pan Xiao Yong , Yao Guo Hong
Published: November 2012

The finite element methodology is conceived to obtain the mechanical parameters about dynamic performance of multilayer A-type U-shaped corrugated structure materials under the in-plane crushing loadings with various impact velocities. A simplified energy absorption model is proposed to evaluate the energy-absorption performance. The evaluation model shows that the optimal energy absorption per unit volume is mainly determined by the dynamic plateau stress. The homogeneous deformation mode, transition deformation mode and dynamic deformation mode are gradually observed with the increasing impact velocities. These three different deformation modes are presented in detail. The in-plane dynamic plateau stress depends on the impact velocity for the multilayer A-type U-shaped corrugated structure materials with a given fixed cell wall thickness. From the physical analysis and discussion of the numerical results, the empirical formula of dynamic plateau stress is suggested in terms of impact velocity.
New Rural Community Planning in the Process of Urbanization
Authors: Zhao Tian Ying , Wang Dan , Wang Ai Feng
Published: November 2012

China has entered a stage of rapid urbanization, which brings rapid development to the economy and society. It also produces many social problems:a large number of migrant workers influx into cities; “a ticket hard to buy”in Spring Festival; education problems of “Children lefe behind”; later life problems of “Empty nesters”,and so on. Sixteenth Congress of Communist Party of China puts forward the urbanization with Chinese characteristic—New Urbanization. It lies in not at the expense of agriculture and food, ecology and environment, and it focuses on the peasants, coveres rural, and realizes urban and rural infrastructure integration and public service equalization to promote economic and social development and realize common prosperity. In the process of the new urbanization, the new rural community planning and construction is an effective grasper of the new urbanization. At present, the new rural community planning is still in the exploratory stage, researching the new rural community planning is of great significance. From the new urbanization perspective, the paper studies the new rural community planning level and main contents: Spatial Development Planning; Regulatory Detailed Planning; Construction of Detailed Planning and Stage Construction Planning. These have certain guidance on the new rural community planning and construction, and advance the urbanization to develope healthy and orderly.
The Research of Chinese Living Space Based on Phenomenology
Authors: Chen Xing , Yang Hao Zhong
Published: November 2012

Science manipulates things and gives up living in them. It is human but not science that lives in architectural space. But, this household is ignored in architectural designing process sometimes, especially in some modern architectural design. How to get architectural space and get the space around architecture out of the controlling of science is the main problem to research. Through analyzing Chinese living space based on phenomenology theories, we got something beneficial to the quality of the internal space and external space of buildings. These things have closed relationship with our body, such as our eyes, our ears and someone else all set up our senses and feelings. And, it is the senses and feelings that detect whether living space comfortable or not. Based on these researches, we set up the new mindsets about architectural space to get out of the restrictions from science.
The Study of Renewal Strategies for Urban Public Space
Authors: Luo Jing , Guo Wei Min
Published: November 2012

This paper analyzes the reasons of decline and loss of urban public space from the perspective of material space design, human behavior and mental activity. And on the basis of analyzing and inducing urban public space renewal cases at home and abroad, this paper summarizes the main strategies of the current urban public space renewal: improving street traffic; replacing place functions; focusing on human-oriented design and harmonizing ecological environment. These strategies have different targeted and practical characteristics, and can provide important reference for future urban public space revitalization practice.
Research on the Flexural Behavior of BFRP Concrete Beams
Authors: Huo Bao Rong , Yang Guang Ning , Zhang Xiang Dong
Published: November 2012

In order to prolong the useful time of the building structure, as well as increase the ability of resisting kinds of architectural diseases, BFRP is used to replace steel, and finished the research tests of BFRP reinforced concrete simply supported beams with different reinforcement ratios. According to the test results and theoretical analysis, we put forward: The BFRP bar is one kind of brittle material without obvious yielding point, but the BFRP reinforcement concrete beam has bigger deformation before the beam collapses. The deflection produced can be approximately viewed as two straight lines which bound the cracking point. As the elasticity modulus of the BFRP is low, the longitudinal tension is mainly borne by the BFRP bar in the last loading stage, the strain of the BFRP becomes large, large deformation will occur on the beam specimen before the damage occurred, so such reinforced concrete has obvious omen and good ductility. As is assumed that the bond strength between the BFRP bar and concrete is enough, the two kinds of materials can work together better, and thus the bearing capacity of the beam specimen can be greatly improved. But as the bonding performance in the test can not be that ideal, the strength advantage of the BFRP can not be embodied. The stripping between the BFRP rebar and concrete is the biggest obstacle which restricts its application, it is necessary to improve the process to produce a better non-stripping BFRP bars. On the same loads, the deflection of the beam specimens are all large, it is mainly due to the fact that the elastic modulus of the BFRP tendons is small, its tensile strength is high, but not fully utilized, so the emphasis should be put on the use of prestressing bars when designed. The design and application recommendations given by the results are of important theoretical and engineering significance to improve the fiber composite concrete structure design theory.
Effect of Sliding Speed on Friction and Wear Behaviors of Copper Rubbing against Carbon Material with Electric Current
Authors: Ding Tao , Li Yu Mei , He Qiu Dong , Xuan Wen Jing
Published: November 2012

In this paper, many experiments on effect of the sliding speed on friction and wear behaviors of pure carbon strip/copper contact line under the AC electric field are conducted on a ring-on block high-speed sliding tester. The result indicates that coefficient of friction increases with increasing sliding speed. And the friction coefficient without electric current is much larger than that with electric current. While the wear rate of pure carbon strips without electric current is much smaller than that with electric current. And wear rate slightly increases with the increase of the sliding speed. Comparison of worn surface profiles in different electric current, it can be found that the profile of worn surface increases with increasing electric current.
Study on the Interaction Mechanism between Screw Conveyor and Asphalt Mixture
Authors: Ma Deng Cheng , Liu Hong Hai , Chen Zheng
Published: November 2012

From the aspect of mechanics characteristics and the tumbling mechanism of the transportation process, the force, the acceleration, the friction and the speed characteristics of asphalt mixture flow were analyzed by using theoretical mechanics and hydromechanics. The influence of the working speed and diameter-to-pitch ratio of the screw conveyor and mixing effect of the material was researched; the relation between the working speed of screw conveyor and the material conveying performance was discussed under the condition of ensuring even flow rate of material. The segregation technical reasons of asphalt mixture and improvement measures were derived. In the experiment, the full-scale test was conducted by using the AC25 mixture. And through changing the using parameters compare the paving operations, the reasonable parameter will greatly improve the uniformity of paving, and the surface proportion of structural depth of mixture decrease at 2.13-1.60. The design method of the screw conveyor with variable diameters and variable pitches is proposed, and the parametric design model of the screw conveyor with variable diameters and variable pitches is established, and which provides a theoretical basis for the structure design of screw shaft with variable diameter and variable pitch.
Study on Frost-Salt Resistance of Fly Ash Concrete
Authors: Sun Cong Tao , Li Wei Hua , Hou Bao Rong
Published: November 2012

Accelerated frost-salt tests of fly ash concrete were carried out, through which the influence of water-binder ratio, volume of fly ash, air-entraining content on the frost-salt resistance of concrete were discussed, and the variation of surface characteristics, weight loss rate, relative dynamic modulus of concrete elasticity with the number of freeze-thaw cycles were investigated. The weight loss of specimens is above 5 percent; Water-binder ratio has decisive influence on the frost-salt resistance of concrete; concrete with suitable volume of fly ash can also increase the standard of frost-salt resistance; there is a critical air-entraining content which can improve the frost-salt resistance by the greatest extent. The relationship between dynamic modulus of elasticity and compressive strength are established. And also, calculation formula for the cycle number of frost-salt resistance is proposed.
An Experimental Analysis of Reinforced Mechanism of Polypropylene Fiber Reinforced EPS Concrete
Authors: Liu Yuan Chun , Hou Wei Jun , Wang Hong Tao
Published: November 2012

The reinforced mechanism with polypropylene fiber reinforced EPS concrete was researched, based on mechanical experiments and photograph analysis of the Scanning Electron Microscopy with HITACHIS-3400N. Polypropylene fiber with 15-mm length and six volume fractions of 0%, 0.10%, 0.14%, 0.18%, 0.2% and 0.25% were used, and consequently, the resultant effects on the mechanical behavior of these concretes were analysed. The results demonstrate that compressive strength of EPS concretes increase with the rise of the percentage of the fiber volume. It is shown that using 0.15~0.2% polypropylene fiber in cement mixture greatly increases compressive strength. Scanning electron microscope images show that the reason for this improvement is that polypropylene fiber can increase bonding strength at the matrix–inclusion interface.
Dynamic Viscoelastic Properties of SBS Modified Asphalt Based on DSR Testing
Authors: Guo Yong Mei , Chen Wei
Published: November 2012

Five SBS modified asphalts and one base asphalt were selected to carry out frequency sweeps over a wider frequency range using the dynamic shear rheometer (DSR). Six asphalt binders were subjected to sinusoidal loading at 30°C-90°C within the linear viscoelastic limits, and master curves of complex modulus (G*) and phase angle (δ) could be constructed by means of the time-temperature superposition principle (TTSP). The results show that the G* values of SBS modified asphalts are significantly greater than those of base asphalt at low frequencies, but are slightly smaller at high frequencies. Compared with the base asphalt, SBS modified asphalts have narrower master curves of complex modulus, and their phase angles are much smaller within the whole frequency range. This indicates that various properties of SBS modified asphalts, such as high-temperature property, low-temperature property, temperature susceptibility and elastic recoverability, are superior to those of the base asphalt. The G* values of the rolling thin-film oven (RTFO) aged asphalt are larger than those of the unaged asphalt in the whole range of frequencies, demonstrating that the anti-rutting performance of asphalt binder is improved after short-term aging.
Cracking Simulation of Asphalt Mixtures Using a Finite Element Micromechanical Model
Authors: Liu Jing Hui
Published: November 2012

Cracking in the surface layer of asphalt pavement has been shown to be a major source of distress in roadways. Asphalt mixture is typically a heterogeneous material composed of aggregates, binder and air voids. Previous cracking studies have not considered the material heterogeneity. Digital Image Processing techniques is a powerful tool to describe the microstructure of the material. A micromechanical cohesive zone model that introduces ductility at the crack tip has been used to simulate the cracking of asphalt mixtures. ABAQUS software is a convenient finite element method to conduct simulations of particular laboratory specimens such as Indirect Tensile Tests(IDT) considering the micromechanical model. Simulation results of the IDT compared favorably with experimental results. Even though this study presented a attempt of a numerical simulation of a simple IDT test, the theory and methods adopted by the study can be applied to the fatigue damage study under the complicated loading considering the material heterogeneity, and then would effectively allow researchers link the micro-scale damage observed on the local scale with the real pavements fail on the global scale.
A Numerical Investigation on Delamination Buckling Behavior in Laminated Composites under Compressive Load
Authors: Xu Zhong Hai , Wang Rong Guo , Liu Wen Bo , Dai Cheng Qin , Zhang Lu , He Xiao Dong
Published: November 2012

In this paper, we predict the delamination buckling behavior in slender laminated composite with embedded delamination under compressive load by using the finite element method (FEM). For the different delamination size and depth position, we illustrate the various parameters effects on buckling behavior.
The Discussion of the Concept of Sustainable Development of Ecological Architectural Aesthetics
Authors: Gan Shen Qi , Zhang Hong
Published: November 2012

This paper introduces the basic concepts of ecological aesthetic, pointing out that the ecological aesthetic comes from population, resources, environment and other factors, understanding the natural beauty from the harmonious compatibility between man and nature, the environment, perception, greatly improving the aesthetic value of taste. This paper introduces the core categories、aesthetic standards and the three characteristics of ecological architectural aesthetics in detail, interpret the ecological architecture and its aesthetic theory.
Effects of Chlorine Dioxide on the Bioactivity of Planktonic and Attached Bacteria Grown in Annular Reactor System
Authors: Shue Meei Fang , Chen Lih Fu , Chen Jen Jeng , Tseng Li Ho , Yang Bo Ming , Lai Wen Liang
Published: November 2012

Annular reactor; Epifluorescent microscope; Adenosine triphosphate(ATP)；Chlorine dioxide; Abstract: The artificial solution, including organic molecular weight cut-off less than 5 K added indigenous bacteria taken from biofilter conducted in bench-scale experiment, was drawn by peristaltic pump pumped into Annular Reactor system (ARs) with flow rate 20 mL/min and rotating velocity of 134 rpm. ARs could reach stable at the operational time of 40 hrs. Then, chlorine dioxide was added into ARs to keep system consisting of three chlorine dioxide dosages , including 0.5, 1.0 and 1.5 mg-ClO2 as Cl2/L. Live-Dead microorganisms in this research were measured using both kinds of dye, such as CTC (5-cyano-2,3-diolyl tetrazolium chloride) and DAPI (4’,6-Diamidino-2-phenylindole dihydrochloride), observed under fluorescence microscopy having G-2A filter (EX 510-560 nm, DM 575, BA 590 nm) for CTC, and UV-2A (UV-2A (EX 330-380 nm, DM 400 nm, BA 420 NM) for DAPI. Of course, the measurement of ATP (Adenosine triphosphate) was used as another parameter to evaluate the bacterial activity. Current data shows that when initial chlorine dioxide of 0.2 mg-ClO2asCl2 /L could not effectively control the bacterial cells, especially that the remaining dosage decreased to zero at longer reaction time. In contrast with low chlorine dioxide dosage, 1.0-1.5 mg-ClO2asCl2 /L could not only control the planktonic bacteria but also inhibit the growth of respiring cell attached on the slide. Parameter using Dead-Live cells and ATP to express bacterial activity could show the similar performance while chlorine dioxide was applied into ARs.
Activity of Deinococcus radiodurans on Chromium Ions
Authors: He Yun Xiao , Chen Xiao Ming
Published: November 2012

This study investigated the resistance of Deinococcus radiodurans to Cr6+ and Cr3+, the redox activity of this bacterium for Cr6+ and Cr3+ and the contributions of various bacterial components to the observed chromium resistance. The results showed that at 0.2 and 0.5 mmol/L of Cr6+, D. radiodurans displayed high growth with an early logarithmic phase. This organism also exhibited moderate growth at 2 mmol/L Cr3+. This strain exhibited strong reduction activity against Cr6+. At 0.2 mmol/L Cr6+, the 8-hour Cr6+ clearance rate was 92.13%. However, the clearance rate decreased sharply with increasing concentrations of Cr6+. At 0.5 mmol/L Cr6+, the 24-hour clearance rate was only 32.81%. By studying the effects of the cellular environment and individual bacterial components on the level of Cr6+, we discovered that D. radiodurans counteracted the effects of Cr6+ primarily through reduction and secondarily through adsorption. The primary activity was found to occur in the extracellular space and the cell culture supernatant. D. radiodurans had no significant oxidation effects on Cr3+. In conclusion, this study showed that D. radiodurans strongly reduces and is highly tolerant of Cr6+ and that the primary reducing agent is secreted from the cell.
Correlate the Toxicity of PAHs with Physical and Chemical Propertie QSAR Descriptors by PCR Method
Authors: Li Xiao Li , Li Xiao Peng , Li Yu
Published: November 2012

The Quantitative Structure Activity Relationship (QSAR) was used to correlate eleven physical and chemical properties (GTCi, Vc, BP, MP, Hf, Tc, Pc, MW, MV, logKOWand logKOC) with toxicity of polycyclic aromatic hydrocarbons (PAHs). A multi-parameter regression model was conducted to simulate the toxicity of PAHs after minimization of the multicollinearity among the ion characteristics using principal component regression (PCR). The toxicity of PAHs increased with the positively correlated variables including GTCi, Vc, BP, MW, MV, logKOWand logKOC. The regression model provided the high simulate ability, with Nash-Suttcliffe simulation efficiency coefficients (NSC) of 0.89 for the modeling. The model may be successfully employed to predict the toxicity of PAHs and be used for further analysis.
Numerical Estimation of Corrosion Environment by Airborne Sea Salt Particles
Authors: Liu Chen Chen , Obata Makoto
Published: November 2012

Anticorrosion of steel bridges has been an increasingly important problem in Japan. For a proper anticorrosion and maintenance program, it is important to estimate corrosion environment of steel bridges. In Japan, airborne sea salt generated from ocean is a predominant factor. Authors have been working on establishing a consistent framework to estimate corrosion environment numerically. It consists of a local and a global approach. While adhesion of airborne sea salt particles to bridge structures are simulated locally by a CFD analysis, the large scale analysis yields a boundary conditions of the local analysis and is given by a part of a mesoscale meteorological analysis. The objective of this work is to numerically investigate reliability of such large scale analysis in estimation of corrosion environment caused by airborne sea salt particles.
Removal of VOCs Using Sludge-Based Adsorbents
Authors: Fang Ping , Cen Chao Ping , Zhang Hong Tao , Tang Zi Jun , Chen Ding Sheng , Chen Zhi Hang , Chen Zhao Lin
Published: November 2012

Efficient and cost-effective sludge-based adsorbents were developed and the adsorption of VOCs on the sludge-based adsorbents was studied in a fixed bed reactor. The results indicate that the adsorption of VOCs on sludge-based adsorbents is typical physical adsorption, the dynamic adsorption capacity of VOCs on adsorbents sharply increases as the VOCs concentration is increased at first, then increasing gradually, at last retains stable with the change of VOCs concentration. The dynamic adsorption capacity of sludge-based adsorbents for VOCs is O-Xylene > Butylcetate > Toluene > Ethylacetate > Benzene > Propanone > n-Hexane, the maximum dynamic adsorption capacity is 0.247, 0.225, 0.192, 0.186, 0.180, 0.176, 0.133g/g, respectively. Meanwhile the adsorption of VOCs on sludge-based adsorbents corresponds to the Langmuir adsorption isotherm equations. The sludge-based adsorbent is a low-cost alternative to activated carbon for VOCs treatment, and this technology is a promising method for the VOCs removal.
Indirect Anodic Oxidation Applied for the Treatment of Simulated Wastewater Containing Reactive Dyes
Authors: Yang Bo , Du Dan , Xie Hui , Sun Ye
Published: November 2012

The treatment of simulated wastewater containing reactive dyes was carried out by indirect anodic oxidation with Ti/IrO2 electrode. The influences of pH value, voltage, electrolysis time and NaCl dosage on the degradation performance were studied. The results show that under the condition (pH=3, voltage=20V, NaCl=2.5g/L), for reactive orange X-GN and yellow X-R, their solutions almost complete bleach after being treated for 30 min, and the removal rates of COD is 68% after being treated for 60 min; for reactive black KN-B, decolorization rate is up to 100% and the removal rate of COD reaches 60% after being treated for 60 min.
Lab-Scale Study on Removal of Phenol from Contaminated Groundwater by Chlorine Dioxide Oxidation Technology
Authors: Wang Qi Shan , Xu Ze , Zeng You Wen , Yue Shang Chao , Zhang Yi Ran
Published: November 2012

A series of experiments were conducted to investigate the optimal technical parameters for phenol removal by chlorine dioxide (ClO2) oxidation. Results demonstrated that ClO2 could removal phenol effectively, both for simulated phenol contaminated groundwater and practical phenol contaminated groundwater. ClO2 dosage and reaction time were found to have a significant impact on phenol removal, while pH only affected slightly between 6.5 to 7.0 . Under optimal reaction conditions, the removal rate could reach an extremely high level of 97.5% within 30 min at a ClO2 dosage of 0.6 mg/L for the simulated phenol contaminated groundwater with initial phenol concentration of 0.2 mg/L. For the practical phenol contaminated groundwater the removal rate could reach 96% within 60 min at a ClO2 dosage 1.0 mg/L. This study provides a feasible chemical method to removal phenol from contaminated groundwater.
Remove of Congo Red from Wastewater by Adsorption onto Eggshell Membrane
Authors: Liu Jin , Cheng Xian Zhong , Qin Peng , Pan Ming Ying
Published: November 2012

The performance of native eggshell membrane in removing of Congo Red (CR) from aqueous solution was investigated. The effect of pH, adsorbent concentration, temperature, and contact time were performed by static testing. The maximum biosorption was both observed at pH 7.0 on the eggshell membrane. Optimal adsorption capacity (112.3 mg g-1) at initial concentration 10 mg L-1 and rate (99.17%) was obtained at pH 6.8. Characterization of the bioSuperscript textsorbent eggshell membrane was performed using scanning electron microscope (SEM), and Fourier transform-infrared (FTIR) spectroscopy. The kinetic and equilibrium studies suggest that the adsorption follows Langmuir isotherm model.
Determination of Reduce of Arsenic (III) Toxicity to Pseudomonas fluorescens Using Iron by Combined Methods
Authors: Wang Fei , Yao Jun , Chen Hui Lun
Published: November 2012

A series of microcalorimetric experiments were performed to evaluate the As(III), Fe(II), P and their joint effects by analyzing the thermodynamic parameters, microbial growth rate constant k, total heat evolution QT, inhibitory ratio I and highest heat flow Pmax. They were obtained from power-time curves of the growth of P. fluorescens. The effect of mixed As(III), Fe(II) and P were moderate, compared with control, single As(III) or Fe(II). In addition, FT-IR spectra of dry P. fluorescens after the adsoption of As(III) and Fe(II) and their mixture showed that Fe influenced the C-H bonds of the functional groups on the cellwall, the As(III) caused litter effect.
Purification Effects of Artificial Vegetated Floating Bed on Polluted Water
Authors: Li Yan Qiang , Jiang Ying He , Li Zhao Hua
Published: November 2012

Four species of ornamental plants, namely Thalia dealbata Fraser ex Roscae, Hydrocotyle vulgaris L., Iris pseudacorus L. and Canna indica L. were planted on the ecological floating bed, respectively, so as to study their effects of removing pollutants from polluted water. The experiment lasted for 42 days. The results indicate that the four plant species are adaptable to grow in polluted water and their fresh weights, heights and roots increased significantly at the end of the experiment. The growth rates are in the sequence of Canna > Thalia dealbata > Iris > Hydrocotyle vulgaris. The four test plant species have different effects on DO concentration in water, and the influence degrees are in the sequence of Hydrocotyle vulgaris > Thalia dealbata > Canna > Iris. All of the four plant species have a strong ability to remove NH4+-N, TN, TP and CODcr,, which is higher than that of the control treatments (P<0.05). The efficiencies of removing NH4+-N TN, TP and CODcr, by Hydrocotyle vulgaris , Thalia dealbata , Canna and Iris are 96.83%, 90.32%, 82.75% and 78.73%; 78.98%, 76.15%, 70.87% and 62.43%; 62.28%, 56.57%, 60.00% and 54.84%; 93.99%, 92.96%, 92.45% and 92.39%, respectively. Seeing that they have significant removal efficiencies on pollutants, the four plant species are recommended as ornamental plants applicable to ecological restoration engineering of polluted water in urban areas.
Study on Sulfur Dioxide Atmospheric Environmental Capacity of Chengdu Urban Agglomeration
Authors: Wang Wen Yong , Ma Xiao Juan , Ke Bo Jun
Published: November 2012

located in the west of Sichuan Basin and composed of Chengdu City, Mianyang City, Deyang City, Ziyang City, and Meishan City, Chengdu urban agglomeration is an area where industry, population and motor vehicles are densely distributed. Therefore, there are acute conflicts between the economic development and atmospheric environmental protection. On one hand, lots of pollutants emitted by industry and motor vehicles enter the atmosphere and adversely affect the environmental air quality. On the other hand, the dense population needs good air quality. Since the current environmental air quality standards cannot fully protect human health and ecological balance, in the calculation of the atmospheric environmental capacity for urban agglomerations, in addition to pollution control investment and environmental quality up to standards, the pollution hazard losses should also be considered. In the present paper, according to the specific conditions of Chengdu urban agglomeration, a multi-source mode and dual-objective optimized atmospheric environmental capacity model was developed with the minimum pollution control investment and pollution hazard losses serving as the objective function and the environmental air quality up to standard serving as the constraint. The Sulfur Dioxide atmospheric environmental capacity of Chengdu urban agglomeration was calculated by using this model so as to provide basic data for the total capacity control of Chengdu urban agglomeration.
Study on the Resource Comprehensive Utilization of Mine Solid Waste
Authors: Liu Yin , Chen Jun Tao , Yao Shu Yang , Zhang Cheng Xiang
Published: November 2012

Mine solid waste is the great potential resource, but unreasonable resource development leads to the loss of solid waste and then does harm to environment. There are many ways of environmental management and comprehensive utilization of mine solid waste; recover useful elements, produce building materials, secondary energy recovery, fill the mine pit and collapse pit, paving, etc. However, many problems exist such as backward technology, lack of market competition due to low value-added products, government support which remains to be strengthened, less awareness of reasonable development of resources and effective environment protection, backward laws and regulations. Based on these problems, some relevant proposes were put forward.