bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance and Economic Comparative Study of Interlocking Block and Clay Brick Buildings
Authors: Chaimoon Nida , Lertsatitthanakorn Chareonporn , Chaimoon Krit
Published: September 2013

This paper presents the results of an inquiry into the comparative thermal performance and economic viability of interlocking block and clay brick. To this end, two test rooms of 2.4 m width, 2.4 m length and 2 m height were built. The first room was constructed using interlocking block wall whereas the second room used commercial clay brick wall. Data recorded included room temperature, inside and outside surfaces temperatures of all walls, and solar intensity. The experimental results showed that heat conducted better through the interlocking block than through the clay brick. This was not surprising because the thermal conductivity of the interlocking block is 234% higher than the clay brick. However, the cost of interlocking block wall was lower than the clay brick wall by 34.5%. An economic analysis indicates that the payback period of the clay brick in tandem with a 1 ton, split-type air-conditioner depends on the indoor set-point temperature. The payback period extends over a considerable time, and as such, the interlocking block represents the most cost effective alternative for wall construction.
Research on the Properties of Sea Sand Concrete
Authors: Hong Chu Jian , Fan Yi , Zhang Rong Hui , Wu Huan Ting
Published: September 2013

With the rapid development of construction, the amount of sand used in construction is increasing, and the river sand resources is difficult to meet the growing demand for river sand. With the awareness of ecological protection in recent years, the country have gradually taken measures to limit the over-exploitation of the river sand. Using sea sand to produce building materials is a general trend, such as sea sand concrete. In this paper, using sea sand and river sand to make concrete, and comparing the performance of them. Studies have shown that, compared with the ordinary concrete, the strength of the sea sand concrete modified by colloidal crystal has improved significantly.
The Bearing Capacity of Footings near Slope Considering the Footing-Soil Interaction
Authors: Jiang Yang , Dong Yun , Sun Wen Bin , Chen Bao Hai
Published: September 2013

In some cases, structures are built on or near aslope. The ultimate bearing capacity of the foundations for these structures issignificantly affected by the presence of the slope. In this paper, the ultimate bearing capacity of footings near slopes is investigated by the finiteelement method. Consideration is given to the effect of slope angle, height ofslope, the distance from the edge of the slope to the footing, soil propertiesand the interaction between the soil and footing. Conclusions are drawn: Ingeneral, the dimensionless bearing capacity qu/γB increases with theincrease of the ratio cu/γB, the increase of L/B, and decrease ofthe slope angle β. Thecurves describing the relationship between cu/γB and qu/γBcan be characterized using three main properties, namely a linear section, anon-linear section, and zero bearing capacity point. Within the linear section,local bearing capacity failure contained to within the face of the slope; theheight of the slope does not influence the bearing capacity. In the non-linearsection, the curves of the relation (cu/γB, qu/γB) isgoverned by overall slope failure.
Early-Age Free Deformation of Cellular Ceramisite Concrete at Ambient Temperature
Authors: Ni Kun , Geng Ji Chuan , Fang Shan Qi , Shi Yun Xing , Song Zhong Nan , Ding Yi Ning , Zhang Yan Gang
Published: September 2013

The free deformation of cellular ceramisite concrete at early-age was measured with untouched micro-displacement sensor. The results showed foam lacking stability led to shrinkage immediately after casting. Then the concrete presented expansion. After that it would shrink except thermal expansion. The change of ambient temperature led to the deformation of concrete, and a small quantity of sand had negligible effect on this type of deformation. The rate of thermal expansion was faster than that of thermal contraction.
Anti-Sliding Stability Analysis of Saturated Rock Slope
Authors: Luo Wei , Chen Jia Qi , Zhao Lian Heng , Cheng Pan
Published: September 2013

Based on the assumption of the improved groundwater pressure distribution, the calculation expression of anti-sliding stability factor for typical water-saturated rock slope is deduced through limit equilibrium method. Considering the combined effect of slope overload, seismic load, anchoring effect, ice frost, slip surface drag force and slope groundwater pressure, the comparative analysis of typical rock slope sliding stability under waterless and saturated conditions shows that, the outflow joint blocking and the groundwater levels rising have obvious adverse effects on the anti-sliding stability of rock slope. Figures about the relationship of stability factors and geometric factors were drawn and the anti-sliding stability factor can be directly obtained from these figures. All would be the references for the similar engineering projects.
Possibilities of Dry Shell Construction in the Area Family and Residential Houses
Authors: Kovářová Barbora
Published: September 2013

The article deals with the use of flat layered structure with the structure-based panels for building of houses, making extensions to family houses or apartment with a flat roof. There are summarized the advantages and disadvantages of this structural system in comparison with other technologies of construction family houses and residential houses. The article is focused primarily on the suitability of the construction of self-help and the speed of construction.
Study on the Preparation of Flexible Graphite Composites
Authors: Lin Xue Mei , Zhang Bin , Deng Hao Ran
Published: September 2013

Flexible Graphite Composite (FGC) was prepared using flexible graphite as the basic material. The influence of the contents of binder and carbon fiber, and forming temperature and pressure was discussed on the mechanical properties. The experimental results showed that the optimum technologic conditions are binder A content 3%~10%, carbon fiber 0.5% ~1%, forming temperature 500°C~900°C, forming pressure 18MPa~25MPa. The density, tensile strength, compressive strength, and bending strength are optimal under these conditions.
Exergy Analysis of a Compressor Assisted Triple-Effect Absorption Refrigerating Cycle
Authors: Geng Chun Jing , Liu Ying Fu
Published: September 2013

Adding a compressor to basic in-counter-series triple-effect lithium bromide absorption refrigerating cycle is an effective solution to reduce the temperature of high pressure generator and slow down the corrosion situation. Exergy analysis based on thermodynamic analysis shows that the compressor placed between the low pressure generator and the condenser is the best, which help the system get the highest energy efficiency.
Analysis on Stability of the Expensive Soil Cutting Slope Based on ANSYS
Authors: Tan Bo , Zhang Rui , Lai Yan Ting
Published: September 2013

Landslide of expansive soil slope is a serious disease and difficult to correct in highway construction. And the mechanism of landslide of expensive soil cutting slope is complex, so the traditional slope analysis method is unable to analyze it to obtain the reasonable explanation. But the numeric analytic method can obtain the stress, strain and plastic zone of side slope analysis the distortion process of earth slope and the latent sliding plane reasonably, adopt the safety factors to evaluate the slope stability, The paper based on ANSYS and adopts the nonlinear and elastoplasticity model of soil, and use the theory of the shear strength reduction method with FEM to analysis the rule of NanYou road expansive soil landslide. Keywords:Expensive soil landslide of cutting slope swelling force FEM
The Application of Network RTK Technology in Road Construction Survey
Authors: Qian Yue Lei
Published: September 2013

With the rapid development of the global satellite positioning technology, computer technology, networking and communications technology, the network RTK has been becoming increasingly mature, with its application span increasingly enlarged as well. Accordingly, the application of network RTK in the relevant engineering survey are becoming more and more increasingly popular, along with its efficiency, high precision and reliability wining the favor of the majority of surveyors. This article illustrates the principles of network RTK, processes and the application of the measurement in road construction, hoping that could provide relevant theoretical references for technical staff.
The Determination of Sc, Se and Re in Uranium Ore with ICP-AES
Authors: Yang Jin Hui , Dai Shi Liang , Liu Li , Wang Jin Song , Liu Hai Yan
Published: September 2013

The determination method of ScSe and Re in uranium ore with ICP-AES has been developed. The determination limits of ScSe and Re are 0.03μg/ml0. 03μg/ml0.016μg/ml respectively. The RSD is less than 8% , and the recoveries are 96% ~106%.
Model Tests on the Layout of Punning Position in Dynamic Compaction for Loess
Authors: Cai Jing , Wang Yong Yu , Luo Ming Da
Published: September 2013

To find the influence of the layout of punning position in dynamic compaction for loess, four model tests are performed, which equal in the tamping energy but differ in the layout of punning position. In model tests the settlement, the dry density and the shear strength parameters of the soil samples are measured and analysis of the effects of different test plans is made. The test results manifested that the decrease of the distance between the pounding points might result in an increment of the settlement, the dry density and the cohesive strength but not the angle of internal friction. And from the comparison of the test results, a more efficient layout of punning position is given.
Research and Application of WebGIS System Based on 2D&3D Integration
Authors: Wu Feng Hua , Zhang Ya Ning
Published: September 2013

Article takes the tourist information service system based on 2D&3D intergration as an example, and shows the development method and process of WebGIS system based on the combination of the 2D GIS and 3D GIS; and emphasis on the data import, coordinate setting, format conversion, etc in the process of building 3D model.
Analysis of the Evolution of Xiaomiaohong Based on Remote Sensing Axis Line Method
Authors: Gu Yan , Li Huan , Gong Ming Jie
Published: September 2013

With the rapid development of tidal flat reclamation and construction of port in the Marine East of Jiangsu project, Xiaomiaohong creek nearby Lvsi port located at radial sand ridges sea area was selected as a typical area for understanding its topographic and morphological evolution, which is conductive to the construction of port. By using the Remote Sensing Axis Line method (RSAL), the Axis lines of Xiaomiaohong creek were extracted based on one MSS image and six TM images in the period of 1979, 1987, 1989, 1993, 1995, 2003 and 2009. The results showed that: (1) on the basis of overlaying generated axis line and DEM (digital elevation model) data both acquired in 2003, axis line can be the substitution of the thalweg line because of similar trend and minor deviation of above two kinds of lines, which is revealed that RSAL was serviceable and effective to understand dynamic evolution of tidal creeks quickly and accurately; (2) deviation between axis line and thalweg line is inevitable because of the slopes of both side is asymmetric. The biased distance depended on the slope degree of creeks. The much larger slope degree is, the further distance is shifted; (3) from 1979 to 2009, the front end of Xiaomiaohong creek were growing and its subordinate branches were eroding. Some new subordinate branches were turned out and developed in southern part caused by the strong hydrodynamic condition. Based on the comparison, the entire tidal creek was relatively stable.
Study of Geographic Information System Applications in the Oil Field
Authors: Wang Zhen Hua , Tian Yu
Published: September 2013

GIS application in petroleum industry is more and more attention, moving from ordinary data management into in-depth geographical analyses. The article briefly introduces the situation several previous studies about GIS applications in oil field ground construction, production forecast and management, geological thematic mapping, reservoirs modeling, ect. Propose the direction and trend of GIS applications in oil industry in the future.
A Semantic Similarity Algorithm for Geographic Information Service Matching
Authors: Wang Shao Yi , Yu Hai Bo , Su Xiu
Published: September 2013

In this paper, based on the analysis of two types of semantic similarity algorithm: the concept of the amount of information algorithm and the concept of distance method, combined with geographic information services matching their own characteristics, one for geographic information services matching semantic similarity algorithm in enhance distinguishing ability of geographic information services at the same time, a substantial increase in the efficiency of service matching. The prototype system experiments prove the feasibility and effectiveness of the algorithm.
GIS Technology Applied to Numerical Model of Tidal Current
Authors: He Jie , Zhao Xin Sheng
Published: September 2013

In order to show the calculated results from numerical model of tidal current easily, the Mapinfo software may be help for the graphics display as its outstanding function, and its relation database also storages and manages the mass data from numerical model expediently. GIS technology would be applied by a square cell in map, and the combined application is discussed in the stage of modeling, computation and demonstration, including the original data in AutoCad document, computed data in numerical mode and graphic data in the table sheet of Mapinfo software. This method is tested in Shizi Yang channel, and the model results can be shown and inquired, which can improve the efficiency of mathematic model in modeling, debugging and after-managing.
Integral Hoisting Technology of Arch Rib of Concrete Filled Steel Tube Arch Bridge
Authors: Zeng Wen Jie , Yang Si Qi
Published: September 2013

The construction of integral hoisting of arch rib of concrete filled steel tube arch bridge has the advantages of simple process, easy quality control, small safety risk and not affecting the river navigation, etc. This paper introduces the construction method of arch rib assembly and arch rib large segment hoisting.
Soil Nailing and Template for the Basement Exterior Wall Waterproof Construction Technology
Authors: Pang Ping
Published: September 2013

For soil nailing armor for outdoor mold technology principle, construction technology of underground practice and the key parts operation are introduced. Through economic analysis, the author points out that this construction method is simple and easy to operate and the waterproof effect and quality can be assured.
Bare Concrete Formwork Striding Shearing Force and Deflection Boundary Design
Authors: Ding Hong Yan , Liu Yuan
Published: September 2013

There are some key points such as important load during design Bare Concrete Formwork, method about achieveing standard on Bare Concrete use Stride Shearing Force and Deflection Boundary theory.
Study of Seepage Properties of Fractured Rock Mass Based on Improved K-Means Clustering Algorithm
Authors: Guo Hai Qing , Wen Bo , Bai Xiao Feng
Published: September 2013

Seepage properties of fractured rock mass are of prime importance for hydraulic engineering and accurate description of rock fracture geometry parameters is an important and basic task in rock hydraulics. In this paper, an improved K-means clustering algorithm for structural plane of fractured rock mass was first brought forward and the corresponding Matlab program for discontinuity orientations partitioning was compiled and then used in the fitting analysis of dominant orientations of certain dam foundation rock mass. On this basis, combining calculation formulas of multi-group fractures, the permeability tensor and principle value was calculated for the actual dam foundation. The results provide a theoretical and computational reference for other similar projects.
Management of Gypsum in Construction Site - Case Study
Authors: Viana Erika T , Ribeiro Lubienska Cristina L.J. , Lintz Rosa Cristina Cecche , Gachet-Barbosa Luisa Andréia , Pires Marta Siviero Guilherme
Published: September 2013

The waste generated by the construction sector have increased significantly, becoming an increasing problem, since most of this waste is deposited irregularly, not giving its proper disposal. Such waste, if not disposed properly contribute to environmental degradation, affecting not only the environment, but also, the quality of life. The gypsum products are among the wastes of this activity. Gypsum is a material that has many applications in the construction and generates significant volume of waste that most often is not reused, and usually has its final destination in landfills or dumps. The objective of this research was check on a construction site what kinds of alternatives are used for the management of waste gypsum in the building. The plaster can be recycled easily, being used in the production of cement. For the realization of recycling, there's the ATT - Transshipment Areas and Screening, in which they receive the plaster and other residues to prepare them for their industrial reuse. This way you can properly allocate the waste gypsum, without causing environmental damage and promoting better management of the construction site.
Keywords: recycling of gypsum, management of construction site.
Simulation of Inspecting Stress Concentration with Thermoelastic Stress Analysis
Authors: Zou Lan Lin
Published: September 2013

The thermoelastic stress inspecting stress concentration was simulated using element plane223 of software ANSYS, comparing the result of simulation analysis and theory calculation, the simulation results of temperature and stress are precise extremely when the specimen is loaded sinusoidal load; the temperature changes of the right node in hole border is 0.305°C and the temperature changes of the bottom node in hole border is 0.098°C, the simulation results error comparing to the theory value are respectively 0.33% and 3.92%，which meets the real need. The temperature change value can be inspected with regular infrared camera, it will be a reliable method for inspecting and locating cracks in steel bridges.
A New Maximal Theorem in Product GFC-Spaces with Application to Systems of Generalized Mixed Vector Quasiequilibrium Problems
Authors: Wen Kai Ting
Published: September 2013

In this paper, a new maximal element theorem is established in product GFC-spaces. As application, a new existence theorem of solutions for systems of generalized mixed vector quasi-equilibrium problems is obtained.
Comparison of Instantaneous Power from Variable Shock Loads in Time Based on the Dissipation Model
Authors: Rajczyk Marlena
Published: September 2013

The results of the analysis of the vibration energy from impact loads varying in time using the dissipation model. On the basis of the solutions resulting from the model of the second order differential equation with variable driving function analysis was performed at the time of the FFT function of the displacement of dissipation points by the adopted and specified matrix values of the masses, elasticity and damping. Spectral analysis is based on the compounds resulting from the vibration energy proportionality, as a momentary power surge force, to the sum of the product of the squares of the displacement and squares of the vibration frequency.
Advances of Research on Mode Localization in Mistuned Cyclically Periodic Structures
Authors: Liu Zhan Hui , Liu Wei , Gao Wei Cheng , Cheng Xiang
Published: September 2013

The mode localization phenomenon in mistuned cyclically periodic structures has been a hot spot in the past few decades. According to numbers of documents, the fundamental concepts, mechanism, main research methods, and the main results of mode localization are introduced; the current research status of the mode localization is summarized. The possiblity of mode localization in a telescope reflector model has been analyzed by using Finite Element Method. We also illustrate the problems for further studies, including: the unified modeling and analysis theory with more extensive applicability and better analytical accuracy; determining how to properly introduce mistuning parameters that can reflect the true state of the structure; constructing mode localization factor which can sensitively and effectively reflect the effect of mode localization; developing new damage identification method considering the influence of mode localization; how to make use of the localization characteristic to control the vibration level of the important sub-structure and improve the sensitivity of the periodic structure to the random detuning.
Single Vortex Simulation around a Square Cylinder
Authors: Liu Zhe , Lin Peng , Zhou Qi , Li Dong Xia
Published: September 2013

This paper presents a numerical method to simulate singel vortex based on unsteady RNAS model, and the influece of such a single vortex on the flow characteristics around a square cylinder is discussed.
Influence of Dilation on the Axial Load of Bolt as Joint Subjected to Shearing
Authors: Chen Wen Qiang , Jia Zhi Xin , Zhao Yu Fei , Zhou Ji Jun , Lin Xing Chao
Published: September 2013

Based on the load transfer mechanism of bolts, the relationship between the axial load and shear displacement of bolt changing with the dilatancy of joint was analyzed, then the theoretical solutions of axial load of the bolt were verified by the direct shear test of bolted rock mass with different normal stress (0.5MPa, 0.7MPa, 1.0MPa) applied on the joint. The results show that the calculated values fit well with the results of tests; the increment of dilation angle can enhance the axial force of bolt quickly, but decrease the length of crushing failure zone.
Hydraulic Characteristic Analysis of 3-Arcs Blades Surface in the Centrifugal Pump
Authors: Lin Yu , Li Hui , Han Shu Ren
Published: September 2013

According to the shape of 3-arcs blade the distribution function equations on 3-arcs blade surface were deduced and the hydraulic characteristics on blade surface were analyzed. Based on the establishment of relative velocity and pressure equations, the step change equations of relative velocity and pressure on blade surface were also deduced on connected line which was formed by the intersection of two cambered surfaces, and the reason and the relationships between control parameters were revealed. The step change value of relative velocity is equal to diameter difference of two intersect arc cylinders. The step change value of pressure is concerned with the position coordinates of initial origin of two intersect arc cylinders. Calculation example confirmed that the step changes of relative velocity and pressure will appear on intersection of two cambered surface.
Use of Fiber Optics for Bubble Studies
Authors: Ryu Yong Uk , Jung Tae Hwa
Published: September 2013

Air-water flows are of importance for all the areas related to fluid mechanics. Especially, although kinematic investigations of the multi-phase flows have been conducted for a long time, velocity measurements are still considered as a very challenging part. This study introduces an imaging technique applying shadowgraphy and coupled fiber optic probes for velocity measurements of air bubbles. The fiber optic probes apply optical fibers to the well-known intrusive phase detection probe with a shape to reduce flow disturbance. The present method is used for bubble plume measurements and obtained velocity result is discussed. Finally, the velocities are compared to examine the reliability of the methods.
Application of ARMA Regression Model of Housing Prices Influence Factors of Xi'an
Authors: Zhi Hui , Wang Yue Fan
Published: September 2013

By selecting the relevant factors affect the real estate price, with the qualitative analysis method to analyze the housing prices changes of Xi'an, and then establish ARMA regression model of the housing price index, found that the factors exist long-run co-integration. In order to better reflect the actual, the government policy as a dummy variable is introduced into the model to make regression results more significantly, showing that government policies play an important role in the control of the impact on real estate prices.
Queuing Systems in Management of Construction
Authors: Ginzburg Alexander
Published: September 2013

Management of construction deals with the issues of time organization of the construction process including logistical support, well-timed delivery of construction material, carcasses and goods to warehouses and construction sites. Thus, the modelling of process includes various problems based on the mathematical processes investigation. The analysis of the process organizational and technological systems in construction proves that most of them come to the queuing systems, that is the systems designated for requirement stream-processing for queuing.
Groove Stability of Diaphragm Wall Excavation in High Confined Water Stratum
Authors: Liu Yu Hong , Xu Kai
Published: September 2013

Based on the construction of diaphragm wall groove of Hangzhou metro station engineering and combined with construction practice, detection and simulation, the groove stability of diaphragm wall in high confined water stratum was studied in aspects of construction parameters and geological conditions. Studies have shown that, the high confined water stratum is an important factor in the groove stability of diaphragm wall, the buried depth of head should be reduced; the deformation of groove wall reduces significantly with increasing in mud specific weight; and the width of groove should be control well.
Project Proposals Decision Model Based on Sustainable Development with Triangular Fuzzy Numbers
Authors: Wu Yu Meng
Published: September 2013

With the serious problems of resources shortage and environmental pollution, researchers in civil have to pay attention to the sustainable development of civil engineering. In order to invest more reasonable and choose the best scheme, a kind of decision-making method is put forward with Triangular Fuzzy Numbers from the angle of sustainable development. And this method was proved applicable by an example.
Study on Unbalanced Bidding of Contractor Based on Engineering Change
Authors: Yan Ling , Zhao Chao Chao
Published: September 2013

Contractor uses the unbalanced bidding strategies for the income-generating, because unbalanced bidding can link the engineering change and income-generating. However the lack of knowledge for the change of project state is the key factor that the contractor can not achieve income-generating successfully. First the thesis identified the opportunity of contractor's unbalanced bidding from the construction plan, design drawings, and project amount. By introducing the trigger mechanism to show the trigger mechanism of the unbalanced bidding, it indicates that only when the unbalanced bidding is triggered by the engineering Change the state of project will execute as expected and the profit of contractor can ultimately change from A''' to B'''. Through analyzing the change of state of project under engineering change, the thesis gives unbalanced bidding strategy for contractor.
The Developer Agent-Construction Mode in Affordable Housing Construction and Management
Authors: Chen Xiao Lin , Zhu Jian , Mao Peng
Published: September 2013

With predominant influence on national welfare and people's livelihood, the construction of affordable housing is one of the most important livelihood projects of government. The developer agent-construction mode is put forward through the analysis of affordable housing's features and current main management modes. The new mode can perfectly adapt to the affordable housing construction with its unique connotation and specialty. And the practical application case of developer agent-construction mode shows its strong advantages, so it can be widely used in the construction and management of affordable housing.
Research on BIM Technology Application in the Construction of a Subway Station
Authors: Li Yan Feng , Wang Hui Chen , Zhao Xue Feng , Zhang Jin
Published: September 2013

In order to ensure the project period, installation quality and economic benefit, Building Information Models (BIM) technology is introduced to solve construction safety problems of subway station project. The purpose of this paper is to propose a BIM framework focusing on the issues of practicability for real subway station projects. From aspects of BIM pipeline comprehensive and 4D construction simulation, contents and methods of BIM application and effect are studied. It has been found the project period can be decreased by 15 percent. However, comprehensive issues in terms of BIM effectiveness need to be further developed.
The Research on Selection of Estimate Methods of Artificial Man-Days Unit Price of Power Construction Project
Authors: Ke Hong , Wang Chuan , Luo Gao Feng
Published: September 2013

The selection of caculation method of the artificial man-days unit price of power construction projects is the focus and hotspot problem of the parties of power construction project and cost management departments. With domestic typical provinces, cities, and industry as the research object, this paper carried out case study and comprehensive analysis of three typical estimate methods of the basic principle, characteristics, application scope etc. The paper gives reference for the selection of estimate method of artificial man-days unit price of power construction project and this research conclusion to estimate method has strong pertinence and guidance.
The Analysis of the Engineering Change Impact on Project Cost Based on the Quantities Bill Valuation
Authors: Li Jing , Xu Zong Rong
Published: September 2013

Engineering change directly impacts on project cost of construction projects. Beginning upon the typical engineering cases based on the quantities bill valuation, the author carried out the quantitative analysis of the impact on project cost under different changes , and find out a effective measure to prevent changes in order to control project cost.
Rent-Seeking Game Analysis and Countermeasure Study of Contractors in Various Stages of Construction Projects
Authors: Li Cheng Zhi , Peng Feng
Published: September 2013

Project quality is affected by many factors,of which the rent-seeking behavior of the contractor is an important one.In this paper,the contractor’s rent-seeking behavior in various stage of construction projects and its effect to social welfare is analyzed based on the game theory and rent-seeking theory.After building a game model among the owner,contractor and supervisor,some suggestions are propounded to forestall such behavior from the point of equilibrium solutions.
Numerical Simulation of Damage and Deformation Characteristics of Rock Mass with Transfixion Joint
Authors: Wang Lei , Yu Jiang , Han Jian Xin
Published: September 2013

Use FLAC3D, the interface command to define joint surface, set up rock mass models with 15 °, 30 °, 60 °, etc. different dip joint, and in accordance with the laboratory test data of rock and joint surface for a variety of strength and deformation parameters setting, carries on the numerical simulation of uniaxial compression. Got failure mode, plastic zone evolution and the stress strain curve of rock mass with different dip joint, and the result compared with the actual test has a higher similarity, to prove the feasibility of the numerical simulation method.
Study on Measures to Retain the Deep Foundation Pit for Soil-Rock Composition with Weak Intercalated Layers
Authors: Wang Jing , Sun Feng Ming , Chen Jin You , Xu Chang Jie
Published: September 2013

Aiming at a deep foundation pit in soil-rock composition with weak intercalated layers, in this paper, using the limit-balance method and finite element method to analyze the stability and deformation. The safety factor of foundation pit under the absence of retaining is much less than 1 through the limit-balance method, but through some retaining measures can guarantee its safety. According to the excavation of the foundation pit in special geological conditions, it takes pile-anchor retaining structure in upper and soil nailing in the lower part. Using the finite element to carry out dynamic simulation for the whole project, the results show that: this form of retaining can be very good to ensure the excavation of the foundation pit in the geological conditions, and it may be helpful for similar projects
A New Parameter to Evaluate Liquefaction Resistance of Saturated Sand under Complex Dynamic Stress Paths
Authors: Huang Bo , Chen Xing Yao , Wang Qing Jing , Ling Dao Sheng
Published: September 2013

Foundations are often subjected to complex dynamic stresses which result from ocean wave, vehicle or seismic loads. In this paper, four series of tests under different dynamic stress paths were carried out on Fujian standard sand with hollow cylinder apparatus, to investigate its liquefaction resistance. Test results showed different strength of specimens under different dynamic stress paths, when using the traditional evaluation index: maximum cyclic shear stress. A concept named as load efficiency (E) was proposed in this paper, which is defined as definite integral of dynamic shear stress on time in a single cycle.Eis a new parameter to characterize liquefaction resistance of non-cohesive soil, attempting to normalize the effect of different shear modes, in which the shear stresses are constant or change periodically under different dynamic stress paths. Test results showed that in the isotropic consolidation condition, the relationship betweenEand failure cycleNfis nearly linear in the dual-log coordinate.
The Application of Ground Penetrating Radar Detector Technology in Breakwater of Nuclear Power Station
Authors: Wei Chao , Zhou Guo Liang , Li Tie Ping
Published: September 2013

Based on the analysis of the causes and characters of common security risks in nuclear power stations breakwater, using the ground penetrating radar (GPR) to detect breakwater, and to explore the applicability and accuracy. The analysis showed that ground penetrating radar as a non-destructive detection method for the detection of the breakwater is feasible, and the detection accuracy meet the actual requirements of the project, the results can be used for the safety detection and maintenance of the breakwater.
Analysis of Bearing Capacity of Ashes Foundation's Prospect
Authors: Xie Xin Ying , Yin Xin Sheng
Published: September 2013

This paper introduces the research status of bearing capacity of ashes foundation,presents the purpose of bearing capacity ashes foundation,and shows the research content and may encounter difficulties. The study on bearing capacity of ashes foundation will change the history that the ashes can't be directly used as the foundation, which finds the cheaper the foundation material for some area, and saves a lot of money. The study also can solve the problems of housing which has been built to provide references for the study of civil engineers.
The Application on Stress Relief Method in Deviation Correction of Buildings
Authors: Yang Hai Tao , Zhou Li
Published: September 2013

Combined with the project cases, introducing the principle the method and controlling process of stress relief, indicating the feasibility in the application in the soft soil area.
Application of Depth-Measurable Prefabricated Vertical Drains for Soft Ground Improvement
Authors: Cao Yong Hua , Yu Jian
Published: September 2013

A kind of depth-measurable prefabricated vertical drains (PVD) was applied for soft ground improvement in Tianjin, China. Test was conducted to check the effectiveness of impulse method for detection of installation depth of PVD. The PVD were set into two groups in length: 20 m and 8 m. The installation depth of PVD was checked in 24 hours since they were installed. The tests result revealed that the measuring precision of impulse method is fairly good but it can be effect by the installation depth. The measuring precision can be controlled in 2% for most PVD when the installation depth was about 20 m. There is a fall down of precision when the installation depth was about 8 m. There is no need for additional construction measures when the PVD for impulse method are installed. All of the PVD installed can be checked for installation depth easily, so the apparatus and measuring method are good in operability and stability.
Application of Limit Equilibrium Method to Stability Analysis of Jinping I High Arch Dam Abutment on 3d Multi-Grid Method
Authors: Li Jing Wei , Chen Chen , Wei Wei
Published: September 2013

Based on nonlinear finite element analysis, three-dimensional elastoplastic numerical simulation of Jinping I high arch dam is developed. By using the method of multiply mesh, the stress result of FEM is transferred to any sliding surface (flat or curved), and the safety factors of sliding blocks are computed. The elastic-plastic calculation results indicate that the stress and displacement distributions are basically symmetrical to the river valley. The minimal safety factor of the left abutment under the basic condition is 4.88(larger than 3.5), which appears in the 1740m elevation in the temperature drop condition. However, the minimal safety factor of the right abutment under the basic condition is 3.41(less than 3.5), appearing in the 1710m elevation in the temperature rise condition, which means the necessity of the reinforcement measures to the right abutment.
Performance of the Inducing Joints in Xiaowan Arch Dam with Reservoir Impounded to Normal Water Level
Authors: Lu Zheng Chao , Li Li Bing , Shang Feng , Jiang Yun Hui
Published: September 2013

To reduce the tensile stress at dam heel, inducing joints have been set in Xiaowan arch dam; they were designed to work without water pressure. After the reservoir was impounded to the normal water level of E.L.1240m, monitoring data showed that almost half of the inducing joints were working with water pressure, but leakage remained small. It also indicated the opening and shear deformation of all the inducing joints were small, and the joint surface remained in compression although the compressive stress was decreased by 2.03MPa~9.29MPa. So it can be concluded that the inducing joints are generally working at closing and compressive state. However, some abnormalities were detected: large seepage pressure and increasing crack width in block No.16 which is at the right end of the inducing joints; 5 small cracks appeared with leakage water at the downstream inner surface of the inspection gallery of the inducing joint in block No.22. Therefore, close attention has to be paid to the crack propagation around the inducing joints for the safety monitoring in future.
Stability Analysis and Treatment Design of Meng Dumei Landslide
Authors: Ma Yu Fei , Chen Jian Ping , Zhang Wen , Niu Hong Zhi , Xu Peng , Li Yan Yan , Zhang Jing , Yao Kang
Published: September 2013

The landslide is one of common geological disasters, and it brought about enormous damages to the society. Taking Meng Dumei landslide in Jilin Province for example, cutting slope and filling earth counter pressure were applied in the landslide treatment based on the stability analysis in GeoStudio. The results shows that the landslide is under stable state when the thickness of cutting slope is 28m. This method was shown to be effective and economic on the premise of safety.
Formation Mechanism and Stability Analysis of a Landslide in the Three Gorges Reservoir Area
Authors: Dai Tian Fan
Published: September 2013

the paper introduces the basic characteristics of the landslide, analyzes the formation mechanism of the landslide, I think that the thick and loose efflorescent colluvial deposit on landslide offer material source of the landslide; Steep hill provides effective free surface for the landslide ; Heavy rainfall and human engineering activities are the main factors for the stability of the landslide. According to rock physical mechanics test and stability calculation results under different working conditions, afford a stability evaluation for the landslide. The results show that the landslide may lose stability when cutting slope in the leading edge, loading in trailing edge and suffering heavy rainfall, we should take the necessary measures to prevent and control.
Weight Analysis on Influencing Factors of Reservoir Basin Deformation
Authors: Zhao Er Feng , Zhang Li Bing
Published: September 2013

Reservoir basin deformation monitoring data of some high arch dams has shown that the upstream of the dam subsided while the downstream warped upward slightly. Therefore, combining reservoir basin with high arch dam and foundation, the widespread finite element model is built and the reservoir basin deformation and its influence factor weight are determined through the simulation of the bedrock depth, the extending length of the upstream and downstream and different water levels based on an improved entropy method. The engineering simulation model has proved the reservoir basin deformation mechanism. Moreover, the reservoir basin deformation will tend to converge when the simulation model expands to certain extent. The research can provide suggestions for deformation doubts occurring during the high arch dam operation.
Experimental Study on Shear Strength Considering Initial Void Ratio and Plasticity Index
Authors: Wang Xing Chen , Xu Ri Qing , Zhu Jian Feng
Published: September 2013

A series of drained triaxial compression tests under different conditions were performed to quantitatively study the influence of the initial void ratio and plasticity index on the shear strength of remolded saturated clays. The test results show that both the peak stress friction angle and peak deviatoric stress decrease with increasing initial void ratio and plasticity index of the soil under the same confining pressure; whereas, they increase with increasing confining pressure of the soil under the same initial void ratio and plasticity index. A new synthesized physical parameter λ, which simultaneously represent both the type and the condition of remolded saturated clays, is defined based on the test results in this work. The functional relationships among the parameters φd and peak deviatoric stress in Mohr-Coulomb equation and the parameter λ are established to develop a modified Mohr-Coulomb equation by considering physical properties of soil. In this equation, only two input parameters, i.e., λ and the confine pressure, are needed to predict the shear strength of the soil. In order to check the accuracy of the proposed equation, laboratory tests were conducted to evaluate against the predicted results. The results show that the peak shear strength of remolded saturated clays can be well described by the proposed equation. Key words: shear strength; Mohr-Coulomb equation; remolded saturated clays; initial void ratio; plasticity index.
Elastic Distortional Buckling Stress of Steel Channel Column
Authors: Wang Chun Gang , Zhang Nai Wen , Ma Ping
Published: September 2013

In order to investigate the simple calculative method of channels with complex edge stiffeners for the elastic distortional buckling stress under axial compressive load, a total of 90 cold-formed thin-walled steel channels with Σstyle web stiffeners and complex edge stiffeners , channels with complex edge stiffeners and intermediate V type stiffeners in the web were analyzed by finite strip software CUFSM. The influence of the parameters for the elastic distortional buckling stress was analyzed. Simplified formulas for calculating the elastic distortional buckling stress of Σstyle channels with complex edge stiffeners, channels with complex edge stiffeners and intermediate V type stiffeners in the web under axial compressive load were provided. The availability of the formulas was verified.
Modelling the Dynamic Load Process in the Building Technology Process
Authors: Rajczyk Jarosław
Published: September 2013

Vibration is a priority in the field of construction machinery in the process group dynamic load processing of different materials. Presented here are models with basic mathematical relationships that we utilize to describe phenomena in the task of modeling any process of dynamic loads acting on the treated medium. In the presented material, diagrams are considered necessary when dealing with specific parameters modeling of real processes of rheological effects on the body: elastic-inertial, viscous-inertial and yielding-inertial on, for example, treatments of concrete mixes.
Shear Test and Nonlinear Finite Element Analysis of Hybrid Fiber Reinforced HPC Deep Beams
Authors: Liu Sheng Bing , Xu Li Hua , Lu Hai Lin , Tan Hao
Published: September 2013

The shear behavior of 18 different groups of hybrid fiber (steel fiber and polypropylene fiber) reinforced HPC deep beams and 2 groups of HPC deep beams without fiber were discussed through experimental study and nonlinear finite element analysis. The shear tests were made under the static load and the finite element analysis software ABAQUS was used in numerical simulation. Results illuminate that hybrid fiber can significantly increase the diagonal cracking load and the ultimate shear load of deep beams although it can not change the brittleness of shear damage. Good agreement are found between test results and simulative results, including failure mode of hybrid fiber reinforced HPC deep beams, load-displacement curves, stress distribution of steel bars and concrete, etc.
Splash Erosion Properties of Compacted Cohesive Soil
Authors: Sun Kai , Zhang Ji Ru
Published: September 2013

The effects on different rainfall characteristics and soil properties of rainfall splash erosion were studied by using indoor simulated rainfall device and compacted cohesive soil test model, and then the function relation between them was summarized. The results show that, in the single rainfall process, raindrop size and rainfall splash erosion amount have power function relationship, bigger raindrop diameter, greater splash erosion amount. Soil initial water content and slope show parabola relationship with rainfall splash erosion amount. In the individual rainfall process, there is the same effect law as the single rainfall process. In addition, splash erosion law is consistent whether the soil surface crust or not, but when there is no crust, rainfall splash amount is more than that when there is crust, which illustrates crust can reduce rainfall splash erosion in some extent.
The Damage of Gas Explosion on the Structure
Authors: Li Qin
Published: September 2013

With the development of science and technology and the improvement of people's living standard, Natural gas has been widely applied to daily life. But the sharp increase in natural gas explosion accident. In this paper, Analysis of the effects of gas explosion on the structure, and the safety of the structure was evaluated. By detecting the damage phenomena of gas explosion in a civil building, use the characteristics and law of the gas explosion and finite element simulation analysis method.
Study on the Characteristics of Shock Wave Pressure Caused by Underwater Blasting
Authors: Hao Ming Sheng , Liu Hong Lei
Published: September 2013

By analyzing the characteristics of shock waves in underwater blasting of two bridge piers and monitoring their pressures, this paper found the rule that shock wave pressure varies with different distances from the explosion source. The method of comparison was applied in this study. Based on the characteristic parameters such as pressure amplitude and positive action time, the attenuation formula of shock wave in shallow water was proposed. The results of this paper are of great importance to the engineering design and construction as well as environmental safety assessment.