bluuebunny/crossref_metadata_2025 huggingface dataset:
The Simulation of Ambient Vibration Signal of High-Tech Factory Buildings Ground Base
Authors: Cheng Kai Jen , Lee Shyi Lin , Yang Jie Yu
Published: June 2012

These precision instruments and equipments install inside the high-tech factory buildings have highly tendency of sensitiveness to ambient vibration; therefore, the criteria of ambient vibration have extremely strict requirements in relatively. For comply ambient vibration to have in accordance with the vibration standards, access the principle of increasing the product defect-free rate, the most common solution is applied by enhance the strength of its earth ground base. Nowadays the foundation base design of high-tech factory buildings is not like Seismic Design can be calculated by formulas and acquired the advance ambient vibration results from the software simulations; hence after the finalization of the factory building construction, it is necessary to have in-filed detection with inspection to makeup these improvements. As a matter of fact the weak signal can be hardly detected, so it reply on specific sensor to transform the signal into low current or low voltage then use an amplifier to magnify its amplitude; in the meanwhile, it not only enlarge the required signal but also the unnecessary noise in the whole process. This study apply Ensemble Empirical Mode Decomposition (EEMD) method to analyze the original signal, and the mean period of the Intrinsic Mode Function (IMF) derived partial components to proceed Fast Fourier Transform (FFT) transformation in order to get partial signal frequency; hereafter apply the white noise to substitute the first signal then reorganized it as the source of ambient vibration signal, a comparison is being made between the background vibration value of its actual measurement and the earth ground base response of its real measurement value. It anticipates having control the influential value of ambient vibration of the construction under the phase when design the factory building in order to elevate the reliable degree of foundation construction design in the future.
The Improved Route Optimization Based on Hybrid Optimization Algorithm Based on GA and TS
Authors: Ma Jun , Zhang Li Ying
Published: June 2012

The vehicle routing planning in the process of logistics is a hot issue. There is a lack of traditional genetic algorithm used to solve this issue, so the taboos is introduced to improve it. The improved genetic algorithm based on taboos get high-search speed compared to the traditional genetic algorithm, and this improvement is verified by the example.
Research on Stability Mechanism of Fissured Loess Slope Influenced by Rainfall and Evaporation
Authors: Jin Ai Bing , Deng Fu Gen , Li Long Fu , Zhang Min Zhe
Published: June 2012

Based on saturated-unsaturated seepage mechanism, the features of pore-water pressure, strain and displacement of fissured and fissureless slope are analyzed by using the finite element method. At the same time, pore-water pressure, displacement and safety factor of fissured and fissureless slope as well as fissured slope with different depth and width are comparatively analyzed under the condition of rainfall and evaporation. The research results show that, under rainfall condition, the existence of fissures could change the boundary of soil infiltration and seepage filed distribution, lead to stress concentration and make plastic strain around the fissures area. In addition, as the rainfall response time increasing, the plastic zone around the fissures will spread to the surrounding, thus, the new micro-fissures would be produced during the process of the fissures expansion. Evaporation will reduce the shallow soil water content, increase suction and slope stability. Under the condition of rainfall and evaporation, slope stability is affected more seriously by the fissure depth, but less by the width.
Interval Back Analysis on Mechanical Parameter of Geotechnical Engineering
Authors: Liu Shi Jun , Wang Hong Chun
Published: June 2012

The measured data and mechanical parameters were considered unknown but bounded property and interval numbers were used to denote the measured data and mechanical parameters. The interval parameter perturbation method was presented to solve interval FEM and the interval inverse analysis model was established. Based on the interval parameter perturbation method, the mean and deviation of the mechanical parameters were obtained by the back analysis. For the example of the mechanical parameter back analysis of rock mass cave in the large hydro-electric power station, the effect on the measured data precision was studied. From the results it can be found that the method is reasonable and feasible.
Analysis on the Influence of a Deep Excavation in Tianjin on Surrounding Environment
Authors: Liu Jie , Zhou Da Yong
Published: June 2012

In this paper, which was based on a deep excavation project in Tianjin, the factors and laws of surrounding buildings and surface subsidence during the excavation were discussed through the real-time monitoring and comprehensive analysis of the subsidence of structures, underground pipelines, ground surface and some other items. The results show that the main influence scope of the excavation to surrounding areas is about 2 times the depth of the pit, and enhancing the stiffness of surrounding buildings can increase the resistant capacity against deformation, which will provide a reference for the allied projects.
The Impact of Stress History on Reinforced Silty Clay
Authors: Wang Jian Xiu , Huang Tian Rong , Liu Wen Bai
Published: June 2012

The interfacial characteristic of reinforcement plays a significant role in reinforced engineering, and stress history is one of the key factors affecting the interfacial characteristics. By using the comprehensive geosynthesis test apparatus, a series of pull-out tests were carried out by using reinforced soil composed of silt clay and biaxial polypropylene geogrid. Base on the results of the tests and their curve between shear force and displacement, the impact of stress history on the interfacial characteristics of reinforced soil was explicitly discussed in both qualitative and quantitative manner. It is revealed that the soil’s stress history has great impact on the interfacial parameter of c (cohesive force) and  (internal frictions angle )of the reinforcement; the interfacial parameter of c and  in silty clay is increased by 12.10% and 8.56% respectively when the OCR (over consolidation ratio) increase from 1 to 2; and methods like increasing the thickness of cover soil or increasing the times of rolling to form over-consolidation can reach more higher shear strength in specified project. The results of this research should be a guide to the test, design and construction of reinforced silty clay engineering.
The Interaction Analysis of the Middle-High Multi-Ribbed Composite Wall-Shear Wall Structures and Pile-Raft Foundation
Authors: Zhang Yin , Zhang Cai Yang , Zhang Qi , Zhang Deng Fei
Published: June 2012

Composite structure of mufti-ribbed composite walls-shear walls is composed of Multi-ribbed composite walls and shear walls which form a new kind of resisted load structure together. The paper analyzes the interaction of composite structure of mufti-ribbed composite walls-shear walls and pile-raft foundation with elastic-plastic mode of D-P. The load of superstructure is combined in the raft by substructure method, Finally，the paper obtain the distributed regularity of pile-raft foundation stress, strain by analyzing the influence of force performance which got by the large finite element software ANSYS analyzing interaction of superstructure and the pile-raft foundation-groundwork.
Study on the Characteristics of Elastic Wave Velocities of Rockmass under Different Test Methods
Authors: Ding Wu Xiu , Wang Hong Yi , Xie Bing
Published: June 2012

There are many methods of testing elastic wave velocities of engineering rockmass such as the elastic wave penetration test between adits, elastic wave test on the adit wall and the borehole sonic method etc, but the test results vary with different test methods. It is important to understand and apply appropriately the test results. Based on the field tests, the characteristics of elastic wave velocities under different test methods are studied. The research indicates that the main influence factors of different test methods on wave velocities include the rockmass occurrence environments and the test conditions. For the elastic wave penetration test between adits, the rockmass occurrence environments are basically unchanged, and the influences of the test conditions are little, so the wave velocity obtained by this method is more scientific. The study results are important for the reasonable evaluation of engineering rockmass.
Optimization and Sensitivity Analysis on Estimated Parameters for Slope Engineering
Authors: Liu Wen Tsung , Chang Chia Chyi , Hsieh Zhong He
Published: June 2012

The site is located at mileage 50K +650, Tai-174 Road near the mountain slopes. The vertical range is about 150m and the area is 30000 m2. The present study adopted the finite element method program "the PLAXIS 8.2” to analysis. The contents include: (1) To analysis the slope stability on condition that to increase groundwater level is the antecedent of building a function which is the least squares difference between changing slope value and calculated value. Then this study explored the effect of the soil parameter values in different soil layer, parameter sensitivity, to the objective function. Simultaneously, this study sought the optimal parameters of the finite element model in this site in order to be the post-conditions analysis; (2) In order to prove the correctness, this study analyses and compared the data from sliding surface and tilt tube.
Research Status and Prospect of Concrete Acoustic Emission Technology
Authors: Zhang Qing , Zhang Yang
Published: June 2012

By discussing the current research status of the concrete acoustic emission technology from four aspects as: the concrete acoustic emission of different conditions; the characteristics of the concrete acoustic emission; the Kaiser effect and Felicity effect of the concrete acoustic emission and the analysis of the concrete acoustic emission data. The concrete acoustic emission research should be done with the practical project, and establish effective processing and analyzing technology of the concrete acoustic emission, to apply the concrete acoustic emission technology better to the measurement of real project.
Experimental Study on Slope Stability with Soil Mixed Rocks under Rainfall
Authors: Zhu Fang Cai , Yang Yue , Chen Chun Ming
Published: June 2012

Rainfall is a key factor that triggers failure of slopes. Due to development of western China, there are more and more slopes with soils mixed rocks, with rainfall effect, some of them will fail, which will lead to loss of life and property. In this paper, a laboratory model was used to simulate to study slope failure of this type under rainfall. Along with rainfall, water infiltrated into the slope, and water content increased steadily and kept almost constant, settlement of inner zone increased with different magnitude and reached almost constant value, and cracks formed on the top, small scale failure occurred.
Study on the Mechanical Properties of Backfill Cream-Body during Coal Mining
Authors: Chen Shao Jie , Guo Wei Jia , Wang Hai Long , Zhong Yi Tao
Published: June 2012

In order to research the mechanical properties of the backfill cream-body under engineering conditions in the coal mine, the uniaxial compression test of backfill cream-body with different ages abtained from the filling locale of Daizhuang coal mine is conducted with MTS815.03 rock test system. The characteristics of backfill cream-body in the limited space and a certain environment are studied. Research shows that, the strength of backfill cream-body is high, but coagulability is bad and the discreteness of mechanical properties is different; Uniaxial compressive strength is 2.3 ~ 13.17 MPa and the average is 5.436 MPa; The elastic modulus is very low ,which is only 53.66 ~ 2614.35 MPa and the average is 645.14 MPa. The deformation is bigger when absorbing load; Poisson's ratio is low, which is only 0.0001 ~ 0.2112 and the average is 0.0265, which indicates that the backfill cream-body doesn't need the space of transverse deformation when bearing compression deformation; The mechanical parameters of backfill cream-body with different ages are fitted and regressed. Test results is important to control surface mining subsidence effectively, liberate the coal resources under buildings, railways and waterbodies and protect the ecological environment.
Parameter Design of Anti-Slide Pile Control Method in Floor Heave
Authors: Qiu Yan , Lu Yu Hua , You Chun An , Liu Qiu Yuan
Published: June 2012

Floor heave is a kind of deformation form that rock and soil mass of roadway floor enter a plastic flow state under surrounding stress. Installing anti-slide piles is an effective method to control floor heave. Considering the stress conditions and the characteristic of slip line fields in geometry size when floor heave emerges, some parameters used to design anti-slide piles are proposed to control floor heave, which will provide theoretical basis for further designs of roadway support.
Laws of Influence upon Dynamic Response of High Rock Slope by Seismic Wave Frequency
Authors: Xiao Shi Guo , Zhu Guang Cen , Li Jing Kai
Published: June 2012

On the basis of seismic wave recorded by Wolong Measuring Station in Wenchuan Earthquake occurred on May 12, 2008, and taking a high rock slope (about 1397m in height) at the bank of Zipingpu Reservoir as the specific example, analyses have been made, with Plaxis dynamical simulation analysis program, on characteristics of influence upon acceleration time history, shear strain distribution, principal stresses distribution and stability of high rock slope by original seismic wave, and seismic wave with frequency expanded by 1.5, 2 and 3 times, respectively. Results of the analyses demonstrate that dynamic response characteristics of the slope top are notably influenced by multiplication factor of seismic wave frequency. As far as the real slope in this article is concerned, it generally presents a gradual decrease of PGA of the top of high rock slope, reduction of slope body shear strain and a corresponding drop of dynamic response of slope body as a whole, with the increase of seismic wave frequency.
A Damage Rheological Constitutive Model for Greenschist
Authors: Xing Hui Ge , Tan Da Lu , Xu Fu Gang
Published: June 2012

The stress-strain of triaxial rheological test for rock can be divided into three stages: initial attenuation rheological stabilization rheoligical and speedup rheological stages, the damage is rapid increased in the speedup stage. Damage mechanics is introduced into the Nishihara rheological model, a new rheological constitutive model is established which is combined with the concept of effective stress. The mechanical parameters are recognized by the experimental test data of greenschist. Computing result shows that, the presented model can described the mechanical characteristics in different rheological stage very well, and the error between simulated result and test data is small.
Numerical Simulation Analysis of Dynamic Parameters of the Vibratory Sinking Piling System
Authors: Li Xiao Peng , Meng Xiao Chen , Wang Wei , Zhao Mi Que
Published: June 2012

In the premise of mechanics model and the kinetic equation, the numerical simulation model of pile-soil system has been established with MATLAB, and the numerical analytic solution of kinetic equation has been got by fourth-order Runge-Kutta. And the relationship curves between the pile-soil interface’s friction and time, displacement, acceleration and velocity of the pile have been mainly studied when the exciting amplitude is 100kN, 200kN respectively. With the work, the exciting amplitude will be obtained. In this way, the friction of the pile-soil can be decreased and work efficiency can be improved; besides this paper can also provide a further theoretical basis of pile pressing machine's dynamic optimization.
A Dry Trenching Diaphragm Wall in Soft Soil
Authors: Zou Zheng Sheng , Liu Xin , Zhang Wen Qing , Kong Qing Hua
Published: June 2012

Generally, it is difficult to control the trench stability and panel joint permeability in the construction of a diaphragm wall. The high construction cost is inevitable because of the environmental pollution due to the slurry, waste of water consumption, and debris disposal treatment. A new technique, called the dry trenching diaphragm wall with self-guided double-rectangular-casing, is thereafter developed in the current study to avoid these problems. In this technique, two pieces of rectangular steel casing are driven in sequence and guided each other. The trench is made by squeezing into the soft soil. The panel alignment and straightness are assured without any joints due to the dry concrete pouring instead of the influences of the slurry. Compared to the regular diaphragm wall, the technique is an environment-friendly, less emissive and energy-conserved one by eliminating the slurry pollution with the low cost. It shows that the quality of panel connection is reliable, and the permeation-proof performance is superior with high efficiency in wall-forming due to non-joint interlocking.
The Estimation and Empirical Analysis of CAPM with Errors-in-Variables Problem
Authors: Liu Qiang
Published: June 2012

In many fields such as scientific experiment, economic analysis, etc, the exact measurement of the variables is difficult to obtain owing to the effects of various kinds of factors. In the application of economics, the relationship between the variables is too complex. The problem of dealing with the observed variables with measurement errors has been a vexing problem. In this paper, the estimation method of the capital asset pricing model with measurement errors is given, which effectively solves the problem that variables can not be observed precisely in the capital asset pricing model. The empirical analysis is presented.
Foundation Bearing Capacity Should Include Deformation in the Design
Authors: Zhang Ming Fei , Yang Guang Hua , Wang En Qi
Published: June 2012

At present, foundation bearing capacity used in the practical engineering design is often based on controlling strength, if such it may produce some problems, even accidents. In this article, using Midas-GTS and FLAC3D software to analyse a simplified example of a problematic engineering, we obtain the result that under the conditions of enough strength; the whole structure generates a lot of uneven settlement. On this basis, it explains that the lack of bearing capacity of foundation ideology. And we proposed explicitly foundation bearing capacity should include deformation, in hopes that the influence on the later engineering.
Intelligent Prediction for Side Friction of Large-Diameter and Super-Long Steel Pipe Pile Based on Support Vector Machine
Authors: Zhang Ming Yuan , Liang Li , Song Hua Zhu , Li Yan , Peng Wen Tao
Published: June 2012

In recent years, more and more large-diameter and super-long steel pipe piles are applied in engineering project. But people just know little about the bearing characteristics of super-long piles as it is very difficult to study such type of super-long piles in the laboratory and the accumulated test data of super-long piles in actual projects is very few restricted by test conditions and test cost. In engineering work, design value of bearing capacity of large-diameter and super-long piles is still referred to the calculation theory of ordinary pile that cannot take into account engineering security and economic simultaneously. In this paper, SVM-Q which is an intelligent algorithm based on Support Vector Machines is developed for predicting side friction of large-diameter and super-long steel pipe pile. Result shows that the side friction of longer large-diameter and super-long steel pipe piles with similar bearing characteristics can be effectively predicted by the SVM-Q algorithm after fully learning enough side friction data samples of the limited testing piles with gradually larger length, and boundary length of super-long steel pipe pile in this actual engineering could be qualitatively judged by comparing predictive data with the measured data. This method is very meaningful for initiative predicting the bearing capacity of large-diameter and super-long steel pipe piles in the case that there is no suitable calculation method. The predictive bearing capacity also can be adopted to verify the bearing capacity of large-diameter and super-long steel pipe piles that donot be field-tested by static load tests in actual projects.
Research of Hot Dry Rock on Fracture Temperature Distribution of Storage Layer in Shenyang
Authors: Zhao Jian Bin , Zhao Kun , Feng Xiao Yan , Yan Yan Yan
Published: June 2012

Hot dry rock is more and more appreciated as a kind of newly resource, which is up to the low carbon idea. Storage layer is the heat origin in heating system, is the exchange place for hot dry rock and water. So the temperature distribution tendency of the happening of storage layer and the heat exchange, the prediction for the service life of storage layer will affect the resource utilization and development. The paper uses one - dimensional simulate heat conduction formula based on FenDun mountain hot dry rock research, combined with deep rock parameters and heat conduction parameters of Shenyang to determine that using heat conducting research in storage layer of hot dry rock can simplify reservoir parameters for calculation. And then to get the temperature distribution discipline of storage layer of hot dry rock when hot exchanged.
Influences of Abnormal Climates on Engineering Characteristics of Expansive Soil
Authors: Wang Hui , Cheng Jian Hua
Published: June 2012

Expansive soil is a kind of high plastic clay which is more sensitive to changes of climatic and hydrogeologic conditions, and it has the character of swelling when watering and shrinking when drying out. Such repeated fluctuations from dry to wet induce irreversible deformation ,which will make the shear strength and internal friction of soil drop sharply and cause slope fracture. In recent years, abnormal climatic changes worldwide make foundation stability of expansive soil face severe test . Atmospheric influence depth can supply design basis for slope fracture of expansive soil. But in the situation of abnormal climates , the depth will exceed original design criterion and hazard engineering accidents will happen. Therefore, It has great importance in engineering application of studying influences of abnormal climates to engineering characteristics of expansive soil.
Microscopic Analysis of Sand Shear Band in Direct Shear Test Based on Particle Flow Theory
Authors: Liu Yang , Hu Jie , Wu Shun Chuan
Published: June 2012

In order to analyze the microscopic shear mechanics behavior of sands, a numerical simulation is carried out in sand direct shear test with commercial DEM software PFC2D. By compiling FISH function, PFC2D is able to visualize principal stresses and their inclination inside the sample. In the simulation, particle rotation gradient and particle displacement vector are observed to analyze the microscopic formation mechanism of shear band. The strain and deformation is concentrated in a band whose thickness is about 10 times of average particle diameter and the band is close to the shear plane. The porosity ratio in shear band is higher than other parts of the sample with shear process.
Freezing Pressure and its Influencing Factors of Deep Clay Layer in the Huainan Mining Area
Authors: Shao Wei , Lin Bin
Published: June 2012

Gu Bei coal mine deep shaft freezing pressure of calcareous clay dynamic monitoring showed that the freezing pressure of the calcareous clay fastest grow in the first 2 weeks after the sidewall concrete pouring , freezing pressure has obvious direction . Analysis showed that the layer of freezing pressure is mainly calcareous clay layer deformation pressure, size and the temperature of well has a positive correlation. Maximum freezing pressure of the deep calcareous clay layer approximate the permanent formation pressure values and the maximum frost heave force determined by the frost heave experiments in indoor closed systems ,the average freezing pressure with depth variation of the exponential function can be used to good description.
Numerical Simulation on the Distribution Evolution of Overburden Fractured Zone in Coal Mining and its Visual Detection
Authors: Zhao Tong Bin , Liu Chang Lei , Xiao Zi Yi
Published: June 2012

Based on the mining conditions of Muchengjian Coal Mine in Beijing, the evolution process of the overburden fractured zone was simulated by the distinct element software UDEC. The simulation results show that with the increase of the mining area, fractured expansion space continues to increase upward and is arched distribution. The fracture changes significantly during primary mining and develops slowly latterly. It reaches steadily 8 times thickness of mining coal eventually. The author uses drilling camera detection technology for detecting destruction of overburden and the development situation of the fracture. Based on the results of detection, overburden fracture can be divided into mild fracture zone, moderate fracture zone, and severe fracture zone according to the fracture degree. The fracture develops unevenly in boreholes and shows that the fractured zone and complete zone appeared alternately. The simulation results have a good agreement with the measured data. And the height of stress arch is suit for the upper limit of fracture development, which can be provided guidance for coal mining in the similar conditions.
Soil Strength Reduction Method Induced by Variation of Water Content
Authors: Jiang Peng Ming , Yan Zhong Lei , Li Peng
Published: June 2012

As the complexity of unsaturated soil theory, and it must have a long test period when we study the unsaturated soils, so the conventional design analysis software does not provide such analysis, so we can imagine that such a slope stability analysis does not accurately reflect the actual state of the slope. Based on the known soil moisture content，this paper use the soil water characteristic curve and strength theory of unsaturated soil to calculate the strength reduction parameters of soil which can calculate the stability of the soil slope when using the common calculation method. It is noticeable that this method can be extended and applied if we establish regional databases for this simple method, and these databases can improve the accuracy of the calculation of slope stability.
The Numerical Simulation and Quantitative Study of Testing the Segregation Pile with the Low Strain Method
Authors: Zhang Zhi Qiang , Gu Xue Qian , Yi Nan Gai
Published: June 2012

With ANSYS/LS-DYNA dynamic analyzing method, the 3-D finite element model of testing segregation piles with low strain method is got. By analyzing reflective oscillogram of the segregation layer with the same thickness but different strength, the method to analyze the strength of the segregation layer is got. By comparing the reflective oscillogram of the concrete with the same strength but different thickness of the segregation layer, the method to test segregation thickness is formed. The experiment states that when the pile defect is qualitatively validated as segregation by accurately analyzing the amplitude of the stress wave of the segregation part and the amplitude of the reflective wave of the bottom pile, including the time corresponding to the amplitude. The level of the defect of the segregation layer can be judged quantitatively in a much smaller error range.
Slope Stability Evaluation Based on Projection Pursuit and Attribute Mathematics
Authors: Xu Fei , Wang Ke
Published: June 2012

Evaluation of slope stability is a complex system problem of uncertainty. A new model for slope stability evaluation was established based on the Attribute Recognition Model (ARM) and the Projection Pursuit (PP) optimized by the Particle Swarm Optimization (PSO), which was named as Attribute Recognition Model based on Projection Pursuit Weight (ARM-PP). The attribute measurement of single index was computed through constructing the attribute measurement functions, and the synthetic attribute measurement was calculated by the weight of PP optimized by PSO. Confidence criterion was used to recognize the slope stability. The attribute mathematical theory could successfully resolve the comprehensive evaluation problem with a number of fuzzy attribute. Furthermore, ARM-PP adopted the PP to determine weight, avoiding the subjectivity and randomicity, and ensuring objectivity and accuracy of the evaluation. Case study showed that ARM-PP was feasible and precise in slope stability evaluation.
Character and Dimension Effect of Long Spiral Mud-Jack Bored Pile’s Pressure-Settlement Curve
Authors: Zhou De Quan , Tan Huan Jie
Published: June 2012

With the static load tests of seven piles under the clinic building of the first people hospital in Chang-De city, the character and dimension effect of long spiral mud-jack bored pile’s pressure~settlement curve is analyzed.The result of study shows that the curve may be simulated by Duncan-Chang model so as to obtain exact and alone ultimate load, the increasing of pile diameter can increase the capacity and reduce the settlement more than the increasing of pile length. In order to use the technique widely, the result of the paper can offer the reference in Dong-Ting area.
Influence Elements and Stability Analysis of Bedding Landslide in Strong Rainfall Condition
Authors: Zheng Wei , Wang Yong , Chen Guo Gang , Jin Tao , Zhang Chao Hui
Published: June 2012

Relying on the research of highway engineering of Sichuan province, the disadvantage influence of continuing and strong rainfall on bedding rock slop along the highway in this research is taken into account. In the numerical calculation, both limiting equilibrium analysis and numerical calculation method are used to evaluate the body of landslide stability. According to the result of synthesized methods, the conclusion can be summarized: under the continuing and strong rainfall circumstance, the bedding landslide is easy to lose stability, and this condition becomes an important influence element. The solution schemes of construction based on the conditions of rainfall can be determined.
Research on Fatigue Accumulative Damage of Expansive Soil in the Alternation of Wetting-Drying Environment
Authors: Zeng Zhao Tian , Lu Hai Bo , Zhao Yan Lin
Published: June 2012

The shear strength of expansive soil has the obvious varying property with the changing of seasonal climatic. Based on Palmgrem-Miner linear accumulative damage theory, laboratory experiments on the strength of expansive soil combining with different wetting-drying cycle amplitudes were performed to discuss on the fatigue accumulative damage of expansive soil in the alternation of wetting-drying environment. The results show that：(1)The applying sequence of high (low) cycle amplitudes have significant effect upon the fatigue accumulative damage of expansive soil, and the strength attenuation of expansive soil is mainly controlled by the high circulate amplitude. (2) The Palmgrem-Miner linear accumulative damage criterion can basically reflect the fatigue accumulative damage process of expansive soil in the alternation wetting-drying environment, and the value of damage score “D” is close to 1 when the strength of expansive soil is stabled.
Analysis of Fast Drained and Consolidated Mechanism of Soft Soil under Excessive Pore Water Pressure
Authors: Huang Qing He , Zou Yan Hong
Published: June 2012

Fast drained and consolidated mechanism of soft soil under excessive pore water pressure generate excessive pore water pressure in the soft soil through the addition of vertical and horizontal drainage channel as well as the applied load, because the drainage path is significantly reduced, the seepage velocity speed up and water excreted rapidly under the excessive pore water pressure, also, the effective stress increase rapidly between the soil particles and accelerate consolidation of soft soil so as to improve the strength of soft soil.
Method of Study on Drilling Parameter of Strata Obtained by Photoelectric Encoder
Authors: Tian Hao , Li Shu Cai , Xue Yi Guo , Li Hai Yan , Ning Kai
Published: June 2012

According to complex geological environment of underground space，drilling parameters were obtained based on the research of drilling process. As a sensor for collecting the date of drilling parameter, photoelectric encoder was chosen to combine field test. The change curve of drilling depth with torque in different strata was collected successfully by using photoelectric encoder and can reflect the change of torque during drilling. It is found that there are different response characteristics in different strata, but these response characteristics show the certain orderliness.
Study on Stability and Failure Characteristics of the Slope in Transition from Open-Pit to Underground Mining by Structural Geology
Authors: Wang Yun Fei , Cui Fang
Published: June 2012

According to the impact on the slope characteristics, characteristics of underground ore occurrence, underground ore mining, the open pit slope can be separated by engineering geological zoning. After analyzed the factors that affect the stability of the slope rock, such as the combination relation between the slope surface and the structure surface, deposits of occurrence conditions, structural features and so on. The combination of cutting and under the action of the form may be made of the damage and determine the stability of the various partitions.
The Electro-Osmotic Device for Extensive Soil Dehydration
Authors: Cao Tai Bin
Published: June 2012

In order to improve the electro-osmotic effect in high water ratio soil dehydration consolidation, this paper introduced an electro-osmotic installation system for extensive soil draining which were composed by special power source, electrode, vacuum pump and flow measurement device etc. Among those above, the development of special power source was the core of the system, which was mainly introduced in this paper with power electrical technology and single chip SCM technology and constitutive digital high frequency switch mode power source. The system supported a plenty of technological operations. It was available in worksite.
Arching Effect of Anti-Slide Piles in Non-Cohesion Soil
Authors: Ma Zhi Tao , Wang Yong Ping , Liang Sai Jiang
Published: June 2012

In recent years, Anti-slide pile has been widely used in soil reinforcement works, but the pile soil interaction is not very clear. Numerical simulation was used in this article to analyze the soil arcing effect between anti-slide piles in non-cohesive soil and the main influencing factors, such as soil horizontal pressure, pile spacing and so on were also analyzed. The results show that there has soil arching in non-cohesive soil, and the soil arching effect becomes significantly with the horizontal earth pressure increases, but when the pressure increases to a certain degree, the soil arching will be damaged. The pile spacing is also a major factor to affect the soil arching effect, increases with the pile spacing, the soil arching effect gradually weakened.
Study on Dynamic Strength Characteristics of Malan Loess
Authors: Wang Nian Qin , Liu Xiao Ling , Luo Dong Hai , Yao Yong
Published: June 2012

Vibration effect is a major inducing factor of loess slope hazards and the basis of revealing loess slope mechanism, which often changes loess structure and decreases loess strength. Based on the GDS Lab System, the dynamic triaxial test was performed by using equivalent sine wave under strain controlling. The results are described as follows: ① there is an obvious phenomenon of stress relaxation during the cyclic loading test on Malan loess, and the degree of stress relaxation decreases with the increase of confining pressure and dynamic strain. Under the low confining pressure, Malan loess reaches certain strain only by small dynamic stress within 2% strain ranges. Under high confining pressure, Malan loess will also reach certain strain value by small dynamic stress within 1% strain ranges. At the same time, with the increase of confining pressure, the peak value of dynamic stress increases gradually. ②The dynamic failure stress of Malan loess increases linearly with the increase of confining pressure. The correlation coefficient is 0.99 and the linear regression equation is бd = 0.001б3 + 0.019. ③On the basis of Molar Coulomb failure criterion, the index of dynamic strength was c =3.36kPa, φ=16°. In comparison with the static strength, the internal friction angle decreases significantly while the cohesion slightly.
Properties Uniformity Analysis of Cold Formed Steel Sheet Piling
Authors: Feng Guang Hong , Zhang Hong Liang , Zhang Pei , Zhou Xu Chang , Zhao Yong
Published: June 2012

Through analyzing the molding process characteristics of cold-formed steel sheet piling, mechanical testing and metallographic analysis was made on the curved position of the U-shaped cold-formed steel sheet piling , the following conclusions was drawn: Cold formed steel sheet pile was subjected to the complex cross-section cold roll forming process, resulting in the uneven performance of a steel sheet piling along the horizontal. For the open cold formed steel of asymmetric steel sheet piling and complex cross section, a simple test at flat panel location is difficult to represent the overall performance of cold-formed steel, therefore it is necessary to make a comprehensive performance test on locking. A test method to check the locking occlusion performance on the cold bending steel plate is put forward. The experimental tensile strength of the Q235 level of ordinary carbon steel production of cold-formed steel sheet piling locking bite is 66MPa.
Experimental Study on the Bending Capability of Polyurethane Composite Panel
Authors: Li Hong Qiao , Wang Xiao Ming , Sun Zhi Guo
Published: June 2012

Polyurethane composite panel is a sandwich panel made up of polyurethane and structural surface board, formed by polyurethane foaming. Through bending test on 12 polyurethane composite panels in 4 groups, test results on bending capacity and load-deformation curve for this type of panel are obtained, which set the foundation for further experimental study and theoretical analysis.
Aerated Concrete Block in Engineering Application
Authors: Zuo Jun
Published: June 2012

The autoclaved aerated concrete is a new type of wall material of energy reserve and enviroment protection, it has good economy profit and social profit during basic construction. Basic on application of aerated concrete in Hunan, this paper discussed its application from material, construction, plastering and existing problem. It is reference for relevant design and construction people.
Thermal Fatigue Performance of Steel Fiber Reinforced Polymer High Strength Concrete
Authors: Wang Hai Yang , Huang Pei Yan , Zheng Xiao Hong , Guo Xin Yan
Published: June 2012

To discover the fatigue behavior and durability of the new type fiber concrete named “steel fiber reinforced polymer high strength concrete (SFPHC)”, considering climatic conditions in Guangdong Province, using research method of theoretical analysis combined with experimental study, thermal fatigue behavior of SFPHC used in bridge superstructure in three different temperatures (20°C，50°C，80°C) is discussed and compared with concrete C60 which has similar static mechanical properties at room temperature. The results show that the thermal fatigue performance of SFPHC can be described effectively with the proposed computing formula, and the fatigue performance has been greatly enhanced compared with the C60 concrete.
Development of Mix Proportion for High-Performance Concrete Using Locally Available Ingredients Based on Compressive Strength and Durability
Authors: Bi Jon , Hariandja Binsar , Imran Iswandi , Pane Ivindra
Published: June 2012

Keywords: High Performance Concrete, mix proportions, compressive strength , and durability Abstract. The use of concrete materials to date, remain a key ingredient in such construction work on the construction of building, bridges and infrastructure. One indicator is the increased production of readymix concrete which is nearly 16 billion tons in 2010. But the increased used of concrete, apparently bring the impact of environmental damage. This is due to the fact that production of raw materials contributes greatly to CO2 in the air. One effort to reduce such impact is to use of high performance concretes. Mix proportion of High Performance Concrete are strongly determined by the quality and availablity of local materials. The implications of research result from other countries can‘t be directly used. Therefore is need to the research on development of High Performance Concrete mix using locally available materials. In this research the mix proportions for f’c : 60 and 80 MPa are developed using local materials that are commonly used by readymix producers. The high Performance Concrete is developed based on compressive strength and durability. The result is expected to be applied to readymix industry particularly for construction use in Indonesia.
Water-Soluble Cr (VI) of Solidification-Cured Process and Compressive Strength of Ferrochrome Slag Complex Cement
Authors: Wang Shu Xuan , Li Ning , Wang Fahong , Li Bo , Li Yulong
Published: June 2012

Ferrochrome slag, an essential component in stainless steel, is the by-product of ferrochromium production. The composition of the ferrochrome slag and leaching tests show that the chromium content, 3.68%, is high, although the data of leaching tests under normal conditions is very low. Leaching test was performed on an oscillating shaking table with ratio adjusted to 150r/min at L/S 8 and 80°C, during 5h. The maximum content of water-soluble Cr (Ⅵ) is 2.78μg/g (0.3475 mg/L) from ferrochromium slag under these conditions. The soluble (Cr6+ and Cr3+) content rise in the solidification process，with the increase of ferrochrome slag. The Water-soluble Cr (Cr6+ and Cr3+) under different cured times can’t be detected. The content of ferrochrome slag reached 10% is the best ratio by comprehensive consideration of water-soluble Cr (Ⅵ) of all processes, compressive strength and relevant national standards.
The Effect of UV Light and Xenon Lamp on Anti-Aging Properties of Recycled Milk-Cartons/PE Composite Siding
Authors: Li Jing Jing , Li Da Gang , Guo Yong
Published: June 2012

The colour change and flextural properties of recycled milk-cartons/PE composite siding after tested in UV light accelerated aging champer and xenon lamp accelerated aging champer were studied. It showed that:(1)The ΔE value of samples in UV light champer was higher a little than it in xenon lamp champer after tested in later 1000h, which indicated UV light accelerated aging had more serious damage on material compared with xenon lamp accelerated aging; (2)The MOE of samples reduced 26.24%、39.82%、45.44% respectively after tested in UV light champer for 500h, 1000h, 1500h, with the MOR reducing 18.39%、19.01%、30.65%; while the MOE reduced 11.91%、29.60%、44.94% respectively after tested in xenon lamp champer for 500h, 1000h, 1500h, with the MOR reducing 8.53%、8.21%、26.02%, which showed that the effect on flextrual properties of UV light champer was greater than xenon lamp champer; (3) FTIR analysis showed it appeared carbonyl absorption peak on sample’s surface and methylene content increased a lot, which indicated polymer molecular chains had degraded into samll molecular chains.
Study of Stress Annealing on Giant Magneto-Impedance in Glass-Covered Co-Based Amorphous Microwires
Authors: Tian Bin , Xia Yin Li
Published: June 2012

The glass-covered Co-rich amorphous wires was annealed by an applied stress during the current annealing process. The influence of stress and dc current annealing on the giant magneto-impedance (GMI) effect were investigated by the magneto-impedance. Our experiments showed that the magentic anisotropy is reduced by the annealing treatments, furthermore, the maximum GMI value is increased to 105 %.The GMI value is enhanced by increasing the outer domain volume and inducing a transverse anisotropy due to the changing of inner stress.
Study on the Mechanism of the Soybean Adhesive Improved by Micro/Nano Fibrils and the Bond Strength of the Poplar Plywood with it
Authors: Liu Cong , Zhang Yang , Li Wen Ding
Published: June 2012

The micro/nano fibrils was used to modify the soybean glue, which was used as the adhesive of poplar plywood. The poplar plywood bond strength were evaluated. To explain the improvement in mechanism, Differential Scanning Calorimetry(DSC) and Dynamic Mechanical Analysis apparatus(DMA) were applied to analyze the influence of poplar macro/nano fibrils on soybean glue. The test of bonding strength results show that the bond strength of poplar plywood was enhanced as micro/nano poplar fibrils was added. And the DMA figures of soybean glue illustrate that poplar macro/nano fibrils has improved the deformation resistence of soybean glue plywood and the heat resistance of soybean glue.
Durability of Cement Stabilized Cold-Recycled of Asphalt Pavement Materials
Authors: Wei Lian Yu , Guo Zhi Yu
Published: June 2012

In recent years, due to the dual pressures of resources and the environment,the clod recycled technology renovation and expansion of the old road and new road construction process increasingly attention increasingly wide range of applications. In this paper, the water stability of the cold recycled materials in asphalt pavement on cement additives, frozen stability, thermal shrinkage resistance, dry Shrinkage thefour indicators of experiments to evaluate its durability, and compared with the typical semi-rigid material. To verify the feasibility of the cold recycled material as road base material.
The Influence of Nano-Kaolin to Cement Performance
Authors: Li Xiu Fen , Chen Hui Qin
Published: June 2012

The paper chooses a suitable dispersion according to NANO-kaolin characteristics, develops a suitable testing program, also analyzes test results to determine NANO-Kaolin’s impacts to cement, and the mechanism is described, some results were put forward.
Experimental Study on Mechanical Performance of Bamboo Fiber Reinforced Concrete
Authors: Zhang Xin , Pan Jian Yun , Yang Bo
Published: June 2012

A series of experiments are carried out to investigate the mechanical performance of bamboo fiber reinforced concrete, including the cubic compressive strength and splitting tensile strength. The experimental results show that bamboo fibers can enhance the cubic compressive strength and remarkably improve the splitting tensile strength of concrete. In addition, the effects of various bamboo fiber content and length on cubic compressive strength and splitting strength are also discussed respectively.
Water-Based Coatings for Building Part II: Preparation and Physical Properties of Fluorosilicone Acrylic Emulsions
Authors: Wang Pei , Zhang Xia Zhen , Yu Teng , Heng Li Na , Chen Xie Wei , Liu Lian
Published: June 2012

This paper presented the synthesis of fluorosilicone copolymer latex with dodecafluoroheptyl methacrylate(G04), vinyl triethoxysilane(DB-151), methyl methacrylate(MMA) acrylic acid(AA), butyl acrylate(BA) by emulsion copolymerization and characterized by FTIR. The physical properties are also measured by particle sizes and distributions, water absorption, pencil hardness, circle adhesion method, etc. The obtained fluorosilicone latex showed us excellent comprehensive performance compared to the common acrylate latex.