bluuebunny/crossref_metadata_2025_split huggingface dataset:
Inverse Prediction on the Deformation of a Typical High Loess-filled Foundation during and after Construction— Taking a Key Profile as an Example
Authors: Zhang Jiwen , Cao Jie , Zhu Caihui , Kang Xiaosen 
Published: March 2020

Abstract
To better predict the deformation of the high loess-filled foundation, the values of the parameters of each layer in the high loess-filled foundation are obtained using changing modulus-iterative method. Based on the parameters, the deformation of the high loess-filled foundation during construction was calculated using ideal elastoplastic constitutive model and visco-elastoplastic constitutive model. Comparison between predicted and measured results indicates that the values of the parameters are suitable for predicting the deformation of the high loess-filled foundation.
The Effect of Overburden Depth on the Damage of Underground Structure during Earthquake
Authors: Rajyaswori Shrestha , Li Xinping , Luo Yi , Kumar Mandal Abhay , Xu Kun 
Published: March 2020

Abstract
Nowadays underground structures are essential components in urban areas and their number are increasing continuously. Generally, underground structures show a better performance during seismic actions than structures above ground. During recent strong earthquakes, some urban underground structures suffered severe damages and collapses. Many researchers have worked in this field. Most of them have a common view of shallow underground structures are more vulnerable. Damages in deep underground structures are negligible compared to the surface structures and shallow underground structure. But there are some case histories, where there is severe damage in deep underground structure too. So we cannot neglect the seismic damage of deep underground structure. Nowadays there are many deep underground structures being constructed and in operation. We need to take into account the safety of the deep underground structure. The influencing factors for causing damages in deep underground structures should be studied carefully. In this paper, various case studies are taken into consideration and their results are observed. And the damages in different underground structures at different locations due to corresponding earthquakes are studied and compared, and the pattern of damage occurrence is reviewed.
Surface Subsidence Monitoring in Mining Area Based on SBAS Method Fusing Distributed Scatterers
Authors: Deng Jun 
Published: March 2020

Abstract
Coal mining in Peixian County, Jiangsu Province has a long history, and the surface subsidence of mining area is obvious. To better grasp the characteristics of long time-series surface subsidence in of mining area, this paper uses SBAS method fusing distributed scattererst to process 14 Sentinel-1A images ranging from October 2016 to April 2017, and obtains the deformation field caused by mining in Zhangshuanglou(ZSL) mine. The results show that SBAS method based on distributed object fusion can effectively monitor the surface subsidence. The maximum subsidence of Zhangshuanglou mining area reached - 209.3 mm in the period from October 2016 to April 2017, and there is a trend of gradual increase of surface subsidence. It needs to be early-warning through time series observation.
Strength Reduction Factor of FS Model Subjected to Near-Fault Pulse-Type Ground Motions
Authors: Dong Huihui , Han Qiang , Du Xiuli 
Published: March 2020

Abstract
This paper focuses on the strength reduction factor spectra for self-centering (FS) model subjected to near-fault ground motions with pulse-type based on nonlinear dynamic analysis of single degree of freedom (SDOF) system. In order to investigate the influence of the the FS model on the strength reduction factor, the ratio of the strength reduction factor of the FS model and that of Elastic-Perfectly-Plastic (EPP) model is evaluated and discussed. The ratio is larger than 1.0 and the maximum value can reach 1.35 during medium and long period. This result indicates that it is conservative for the structural design of the self-centering structure when the strength reduction factor for EPP model is used. The investigations of the effects of the post-yielding stiffness ratio and the energy dissipation ratio of the self-centering model on the strength reduction factor are also carried out.
Analysis of Strata Disturbance of Buildings Reinforced by Grouting under Small Radius Curved Shield
Authors: Zhang Xingang , Zhang Qianli , Li Taifeng , Liu Jingyu 
Published: March 2020

Abstract
The influence of shield tunneling process on surrounding buildings, pipelines and roads is in the final analysis caused by segment disturbance of surrounding soil, so it is of great significance to study the disturbance of shield tunneling process on surrounding soil. Based on the monitoring of the vertical displacement of the soil mass and the horizontal displacement of the inner and outer sides of the segment during the excavation, the disturbance of the surrounding soil mass caused by the small curvature radius turning of the shield machine passing through the pre reinforced building is analyzed. The results show that the maximum settlement of soil disturbance during shield tunneling is 4 mm, the maximum camber is 20 mm, the lateral displacement is 3.9 mm, and the internal displacement is 3.7 mm. Under the double influence of foundation pre grouting reinforcement and small curvature radius turning, the soil has a certain camber. This study provides a reference for the construction of shield machine passing through the pre reinforced section with small curvature radius.
Application of Unloading Fractured Rock Mass under Uniaxial Tension Based on Endochronic Theory
Authors: Yu Li , Tu Bin 
Published: March 2020

Abstract
In this paper, the constitutive relation of fractured rock mass under uniaxial tension is derived, and the corresponding numerical solution is obtained. It is found that the kernel function with the Proney expansion can fit well with the ρ(z)=Cz
−α
. When the parameters of the kernel function are taken from the experimental data, the constitutive equation can be simplified in the initial loading stage, which is in good agreement with Jin Fen α = 0.5 gnian’s experimental data under unloading condition. The simplified equation of the endochronic theory is well verified by the experimental data.
Research of Slope Disaster Chain-Stage and Evolvement Rules
Authors: Wang Yu , Shu Zongying , Li Yongyu 
Published: March 2020

Abstract
The slope disaster chain-stage characteristics are intuitive, visual and vivid, and it is the key of understanding the chain evolvement rules. This paper summary of the slope disasters chain-styled characteristic, and divide the chain-styled developmental stages. The principle and evaluative law of slope disasters are expressed by chain-styled relation, so that chain-cutting disaster reduction can be pertinently controlled based on adequately grasp of the characteristic of each chain-styled stage. When the slope disasters are in the weak environment, we carry out chain-cutting disaster mitigation, which will be able to resist the disaster evil to threaten the human, and have possibility and great significance of disaster prevention.
Analysis on Bearing Capacity Factor Nc of a High Loess-Filled Foundation Using a Unified Elastoplastic Finite Difference Method
Authors: Zhang Jiwen , Kang Xiaosen , He Yuqi , Liao Hongjian 
Published: March 2020

Abstract
To obtain the bearing capacity factor of a high loess-filled foundation in Shaanxi Province, China, a serious of numerical calculations on a nonhomogeneous model were conducted using a unified elastoplastic finite difference method. It was found that the bearing capability factor Nc
increases as the friction angle ratio ξφ
and cohesive force ratio ξc
. Furthermore, the bearing capacity of loess-filled foundation can be improved by increasing the degree of density and adding cementation in construction. As an example, during the construction of the high loess-filled foundation, the bearing capacity was improved by making the degree of density come to 0.93. In addition, the width and depth of the slide surface increase as the friction angle ratio ξφ
and ξc
Research progress of soft soil foundation treatment technology
Authors: Jiang Xiaoyi , Lu Qingrui , Chen Shijun , Dai Renhui , Gao Jinhe , Li Ping 
Published: March 2020

Abstract
With the extensive improvement of infrastructure in China in the past ten years, the soft soil foundation is becoming more and more complicated. Therefore, the improvement of soft soil foundation treatment has become a difficult problem that today’s engineering designers have to face. This paper systematically reviews the development of soft soil foundation treatment technology in our country, and emphatically introduces the development process of foundation treatment at home and abroad, especially in our country in recent years, which embodies the cross and comprehensive application of various foundation treatment technologies and forms a unique composite reinforcement technology.
Influence of stratum simplification on stability reliability index of loess slope
Authors: Liang Yan , Chen Chen , Huo Aidi 
Published: March 2020

Abstract
In the calculation of loess slope stability, most of the studies are based on the simplified calculation of the actual slope stratum, and it will affect the calculation results, so the influence of the simplified method of stratum on the slope stability analysis is discussed. Taking the stability analysis of the South Plateau of Jingyang as an example, the stability safety factor, the probability of failure and reliability index of the measured strata model (MSM) and three simplified models are calculated and analyzed based on the Morgenstern-Price method and Monte Carlo reliability analysis method. After comparing the calculation results, it is concluded that the simplification of the model will not have a great impact on the stability safety factor of the slope (in this example, the variation range is less than 0.026), but it has a significant impact on the failure probability and reliability index (in this example, the maximum difference of the failure probability between the simplified models and the MSM is 54.8%). The simplification method is an important factor affecting the calculation results, and unreasonable simplification will cause changes in the critical slip surface and large differences in reliability index.
Study on Influence of Slope Blasting Excavation on Stability of Adjacent Dangerous Rock Mass
Authors: Peng Xiaoyong , Wang Zhangyun , Ma Kang 
Published: March 2020

Abstract
Through mechanical analysis, combined with the instability mode and failure mechanism of dangerous rock mass, taking into the consideration of the influence of blasting excavation of the dangerous rock mass on the dynamic characteristics of it based on the limiting equilibrium method, the stability equations of dangerous rock mass at adjacent side slope with blasting and excavation under explosion load are derived. The engineering practice shows that the slope blasting has obvious influence on the stability of the adjacent dangerous rock mass, and the distance R between the blasting point and the dangerous rock mass and the explosive quantity Q are the key factors affecting the stability coefficient of the dangerous rock. The stability of the dangerous rock mass increases with the increase of the distance R, and decreases with the increase of the explosive amount Q. It is suggested that the impact of the blasting vibration force on the adjacent dangerous rock mass should be considered when the slope blasting is excavated.
Impact Analysis of the Base Stress Caused by Subgrade Settlement behind Culvert under G-300 Load
Authors: Yang Jiayong 
Published: March 2020

Abstract
In order to analysis of influence of base stress on foundation caused by the subgrade sinking behind the culvert pier under G-300 load. Based on the analysis of the calculation parameters and methods of reinforced concrete slab culverts under the G-300 load, a culvert with a clear span of 4 m, a clear height of 3 m and a filling height from the culvert top of 0.5-8 m was taken as an example for the calculation of base stresses with and without downward frictional resistance. The compared results showed that the base stress increases by 68.2-142.3 KPa when there is downward frictional resistance. Under the action of P6’, σ Max and σ Max’ increased obviously with a large increment, which should be paid attention to in the actual design process. Because the force of the action of P6’, the base stress has exceeded the bearing capacity of the foundation, which caused the foundation induced, or increased the uneven settlement of the culvert foundation. And it finally resulted in the damage and the use of the culvert.
Improved Mechanical Properties of Asphalt Mixture Using Vacuum Compaction Method
Authors: Chen Shibin , Shi Xingtai , Yao Yunshi , Gao Yongchang , Su Pei 
Published: March 2020

Abstract
A novel vacuum compaction method, aiming to improve mechanical properties of asphalt pavement, was developed and compared to common compaction method. A compaction cylinder with a hole of adjusting air pressure was designed and fabricated and was utilized for finishing vacuum compaction and common compaction. Compared common compaction, at vacuum degree of-0.04 MPa air void of the sample after compaction decreases by 6.25% and at vacuum degree of-0.08 MPa it decreases by 10.9%, which indicated that vacuum compaction is more efficient than common compaction. Similarly, the changing of voids in mineral aggregate also exhibited the same trend, which indicated that vacuum degree at -0.08 MPa is the most efficient value. Through splitting test, splitting strength under vacuum compaction was higher than that under common compaction, by 10.2%. Furthermore, the ability of strain-stress increased by 11.55% by applying vacuum compaction. These results prove that the mechanical properties of asphalt pavement were optimized by the use of vacuum compaction instead of common compaction.
Low Temperature Crack Resistance and Fatigue Properties of Asphalt Mixture with Pre-buried Heat Conduction Tube
Authors: Zhuang Chuanyi , Zhao Xiaotong , Ye Yali 
Published: March 2020

Abstract
In order to study the effect of geothermal heat transfer tube on the asphalt pavement performance, a heat transfer tube with a diameter of 8 mm was used, which was placed in an AC-16 hot mix asphalt mixture and crushed into a ruthenium plate test piece, using MTS-810 hydraulic servo test. The system evaluates the low temperature crack resistance and fatigue performance, and compares the performance with the asphalt mixture test piece without the heat conduction tube. The results show that after the heat transfer tube is buried, the failure strain of the asphalt mixture is reduced by 40.9%, and the repeated load of the three-point bending fatigue test is reduced by 53.9%. The low temperature crack resistance and fatigue performance are both larger. The degree is reduced.
Study on Fatigue Performance of Pre-Stressed Concrete Box Girder
Authors: Zhou Hongyu , Ma Quanzhou , Yuan Hui , Zhou Yun 
Published: March 2020

Abstract
In this paper, the design parameters and fatigue loading parameters of pre-stressed concrete box girder are introduced, and the multi-stage variable amplitude fatigue test is carried out. The finite element model of pre-stressed concrete box girder is established by using ANSYS finite element software. Comparing the test results and simulation results, it is found that the load-deflection curve of N=2 million times are in good agreement. The principle of the whole fatigue process analysis method is introduced. On this basis, the cumulative damage under different fatigue times is obtained. The fatigue reliability analysis and sensitivity analysis of random variables are carried out by using the PDS module in ANSYS.
Research on Fatigue Reliability of Prestressed Concrete Beams Considering Size Effect
Authors: Zhou Hongyu , Liu Yanan , Cao Xiaoqing , Liu Hongyu 
Published: March 2020

Abstract
In order to study the fatigue reliability of pre-stressed concrete simple-supported beams that considered the effect of size effect, using the existing method to check the fatigue reliability of the test-piece. The fatigue test of three pre-stressed concrete simple beams was carried on, which the size of the beams was different, and collected the data of the fatigue test. Used hierarchical checking method, a second-order moment method to check the reliability of the beams, compared the results of fatigue reliability which calculated by two different checking methods. Analyzed and summarized the effect of size effect on fatigue reliability.
A Study of Size Effect in Shear Resistance of Reinforced Concrete Beams Based on Machine Learning
Authors: Fan Xuefeng , Wang Shijun , Zhang Zhen 
Published: March 2020

Abstract
Size effect is common in structural engineering where a large component fails at lower stress level than a tiny one made of the same material. As a result, the calculation of the loading capacity of a structural component need to be revised when size effect is considered, especially for the reinforced concrete (RC) beam under shear loading. However, due to inadequate theoretical analysis of the size effect in shear failure, the calculation of shear strength in codes all over the world is far from accurate. In this research, the machine learning method, which can efficiently analyse and process data, is applied to study the size effect in shear strength of beams via exploring the experimental data collected worldwide on shear failure of RC beams. The back propagation (BP) neural network model of shear strength of RC beams is built and trained by the data exist, and then give a prediction of shear strength. The values predicted are compared with the values calculated from codes and Bažant size effect formulas and the experimental data, which indicates the feasibility and superiority of machine learning method in dealing with size effect in shear failure.
Influence of Particle Shape on Mechanical Properties of Coal Measure Soil by Discrete Element Method
Authors: Zhang Bang , Feng Haoran , Zhang Hong 
Published: March 2020

Abstract
On the basis of the discrete element theory, PFC3D was used to generate five particle models of different shapes. The impacts of particle shape on the macroscopic physical and mechanical properties of soil mass were analyzed through the numerical simulation of triaxial test as well as from a microscopic point of view. The results showed that the shear strength of irregularly shaped particles is higher than that of spherical particles, and that among the irregularly shaped particles, the shear strength of cylindrical particles is higher than that of ellipsoidal particles. Since spherical particles are associated with relatively large rotation angles during loading, samples have obvious dilatancy. However, among the irregularly shaped particles, since the inter-particular interlocking is strong and the rotation angles are relatively small, samples does not display significant dilatancy. The more irregular is the particle shape, the greater will be the energy dissipated by damping, indicating that the lesser is the kinetic energy stored in samples, the less likely the particles will move, and the more stable the sample will be.
Strength of Cement Mortar Solidified Soil and Prediction
Authors: Wang M , Yang J J , Zhao M Q , Liu H , Li S C 
Published: March 2020

Abstract
Strength is an important index to evaluate the solidification effect of cement soil and engineering design and construction inspection. The unconfined compressive strength test of cement mortar solidified soil was carried out. The results showed that the strength growth rate of cement mortar solidified soil increased linearly with the sand content, which was the maximum at 7d, and tended to be stable after 14d. The strength of solidified soil increased with age, and the initial growth rate was relatively fast. Compared with cement soil, the coefficient of deformation of cement mortar solidified soil did not slow down obviously in the later period. Taking cement mortar solidified soil as cement soil for strength calculation, the strength prediction equation of cement solidified soft soil at full age could well reflect the strength growth rule of cement mortar solidified soil.
Standardization and Diversification of Precast Concrete Facade Panel
Authors: Li Feng , She Long , Wang Huan 
Published: March 2020

Abstract
Standardization is a major feature of the performance of fabricated building facades, which can achieve high-efficiency construction, reduce costs, and simplify production and construction difficulties. However, excessive standardization restricts the diversification of facades. Through a comparative study of Chinese and foreign completed cases, we seek a balance between standardization and diversification, avoid the limitation on facade diversification of standardization, explore performance potential of precast concrete facade panel in China, and achieve the integration of standardization and diversification of precast concrete facade panel.
Review on The Progress of Expansive Soil Improvement in Ten Years
Authors: Pan Yaosen , Li Mingdong , Dai Renhui 
Published: March 2020

Abstract
In the past ten years, due to the property of expansive soil foundation is worse than the general foundation, a series of new problems have been encountered in the improvement treatment, and the research and solution of these new problems have promoted the sustainable development of technology. The characteristics of various methods and their effects on the improvement effect were summarized. Soil displacement is suitable for projects with high engineering requirements and thin expansive soil layer. For projects with weak expansive soil improvement and high environmental protection requirements, fiber improvement and wind-blown sand improvement can be adopted. The longer the curing period, the better the lime improvement effect. The solid waste improvement should be adopted according to the local waste situation. When the effect of single improvement is not good, compound method can be adopted.
Experimental Studies on Thermo-mechanical Coupled Behavior of Pile-Clay Interface
Authors: Wang Jingkai , Zhang Zhichao 
Published: March 2020

Abstract
The thermo-mechanical coupled behavior of pile-soil interface is very important for the mechanical performance of energy pile. It is studied in this paper by the thermo-mechanical coupled direct shear tests with a temperature controllable concrete specimen in the top shear box and a Kaolin clay specimen in the bottom shear box. The results show that the strength of pile-clay interface significantly depends on the temperature, the temperature cycle number and the over-consolidation ratios of clay. With the heating-cooling cycles, the interface strength can increase and decrease monotonically or non-monotonically depending on the stress state and history of clay, which is generally a thermo-elasto-plastic process. It is shown that the thermo-mechanical coupled pile-clay interface behavior is the net effect of the pore water transportation and the rearrangement of clay particles near the interface as well as the thermal consolidation/expansion of clay.