bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental Study on Resistivity Characteristics of Compacted Loess
Authors: Li Xiangning , Ni Wankui , Zhu Min , Wang Haiman 
Published: March 2020

Abstract
In order to study the resistivity characteristics of compacted loess, the resistivity values of 36 groups of samples were measured under six different dry densities. It was found that there was a good exponential relationship between resistivity ρ and water content w. At the same time, the SWCC and Fredlund curve equation of soil water in the process of soil moisture increasing are obtained by using the self-designed loess moisture increasing and decreasing device. The results show that, for compacted loess, the resistivity and suction ψ of soil are closely related to its water content. By comparing the ρ - w curve and SWCC, It is found that the relationship between soil resistivity and suction satisfies the expression ψ = u · ρ λ, u, λ are fitting coefficients. The formula shows that the suction value can be obtained indirectly by measuring the soil resistivity, which avoids the difficulty of suction test and has good applicability.
Study on the Supporting Features of Composite Soil Nailing Wall
Authors: Wang Bo , Jiang Xiaoming , Liu Qilu 
Published: March 2020

Abstract
This paper was based on a deep foundation pit support project in Beijing. FLAC3D software was used to simulate the excavation and support process of the foundation pit in detail according to design parameters and geological conditions. The experiment data of the horizontal and vertical displacements of walls, the axial forces of soil nailing and prestressed anchor cables during excavation and support process of the foundation pit provided a technical reference for the site construction and ensured the safety of the whole project.
Experimental Study on Shear Resistance of Rubber Concrete Brick Masonry
Authors: Wang Fengchi , Chong Bowen , Ding Junsheng 
Published: March 2020

Abstract
In this paper, the shear properties of two kinds of brick masonry specimens are studied, including rubber concrete brick masonry (RBM) and common fired brick masonry (CBM). The specimen is a double shear specimen composed of three layers of nine bricks, with the size of 179 mm × 240 mm × 365 mm. Through the shear strength test, the failure forms of masonry are obtained, and the failure types are classified. According to the experimental data, the shear strength of RBM and CBM are compared, and the factors that affect the shear strength are analyzed. The influence of mortar on the shear strength of rubber concrete brick masonry is obtained. Through regression analysis, the recommended equation of RBM shear strength average value, RBM shear strength standard value and RBM shear strength design value are obtained.
Study on Disintegration Characteristics of Improved Ancient Site Soil by Sticky Rice Solution
Authors: Niu B , Liao H J , Lv J , Wu J , Dong Y D 
Published: March 2020

Abstract
Some ancient sites in northwest China are exposed outdoors and damaged by rainwater erosion. To reduce the damage rate of the earthen sites, based on the principle of minimal intervention, the disintegration characteristics of compacted loess samples were improved by sticky rice solution. To analyze the effect of different concentrations of sticky rice solution on the disintegration characteristics of compacted samples, a series of disintegration experiments were carried out. The experiments results showed that the disintegration phenomenon had a significant inhibition in improved loess samples. The disintegration volume of unimproved samples was more lager than improved samples under the same time. The initial disintegration rate of improved samples was greatly reduced because of hydrophobic film formed by sticky rice solution in the surface. This paper showed that it was feasible to improve the disintegration characteristics of ancient site soil with sticky rice solution, which provided a theoretical basis for the application of sticky rice solution in the protection of earthen sites.
The Research on Bridge Engineering Risk Management and Assessment Model Based on BP Neural Network
Authors: Wang Xin , Wang Yilin 
Published: March 2020

Abstract
Bridge engineering risk research is an important part of bridge engineering management. This paper establishes the risk indicators system of bridge project, and then introduces BP neural network theory into bridge risk evaluation. By using the neural network toolbox of MATLAB, a risk assessment model of BP neural network is bulit. The validity and feasiblility of the risk evaluation model is verified by a practical example.
Study on Influence of Vertical Position of Steel Bracing in Foundation Pit of Open Cut Railway on Deformation of Envelope Structure
Authors: Wang Qingbiao , Ma Pengcheng , Shi Zhenyue 
Published: March 2020

Abstract
The influence of different vertical position of steel support on the retaining structure of deep foundation pit is studied, and the deformation and deformation of retaining pile under multi-supported support conditions are revealed, which provides support design and excavation optimization design for deep foundation pit engineering. in accordance with. Through the calculation of the rational deep foundation pit calculation software and FLAC3D numerical simulation software, the deformation law of the retaining structure under different vertical position of steel support is studied. The research results are as follows: (1) Different vertical positions of the steel support to the retaining pile the deep horizontal displacement of the pile has a great influence. Appropriate encryption of the lower steel support is conducive to the stability of the retaining structure. (2) The influence of the vertical position change of the steel support on the horizontal displacement of the pile top is limited, but the first two supports are vertical. When the position is unchanged, the third steel support is moved down by 1m, which can effectively limit the horizontal displacement of the pile top, which is beneficial to the stability of the retaining structure.
Research on Guarantee Technology of Measuring Accuracy of Highway Bridge Expansion and Contraction Installation Test System
Authors: Liu Lu , Wang Shuai , Liu Jing 
Published: March 2020

Abstract
The highway bridge expansion and contraction installation is the guarantee for the stability of the bridge structure, using a reasonable detection methods is the key to ensure the accuracy of the test of highway bridge expansion and contraction installation. This paper through the investigation and summary of the status quo of the use and measurement of the highway bridge expansion and contraction installation test system, the accuracy of the measurement results of the highway bridge expansion and contraction installation test system is tested and determined, the measurement technical parameters are determined. Through the establishment of the “highway bridge expansion and contraction installation-highway bridge expansion and contraction installation test system standard dynamometer-national force measurement standard” traceability chain, it can meet the needs of calibration of highway bridge expansion and contraction installation test system.
Research on Selection of Prefabricated Lining Design for Single-Track Tunnel of High Speed Railway
Authors: Zhang Shenglong , Wang Zhiwei , Chang Kai , Zhao Peng , Wang Zihong , Tang Qichao 
Published: March 2020

Abstract
Research on selection of prefabricated lining design for 350 km/h single-track tunnel of high-speed railway was carried out. The finite element calculation software was used to analyze the internal force characteristics of the whole lining under different surrounding rock pressure conditions based on the “load-structure” model. On this basis, consider reducing the original lining stress forms as much as possible, and dividing the lining structure into 8 parts at the small bending moment corresponding to the overall lining, and analyzing the surrounding rock pressure under the surrounding rock loads of III, IV and V and the force and deformation characteristics of the block assembly structure under joint stiffness. Compared with the overall lining structure, the prefabricated lining structure increases the maximum axial force by 0.3%, 1.6% and 2.4% respectively, increases the maximum bending moment by 16.8%, 11.1% and 0.9% respectively, increases the maximum lateral displacement by 143.1%, 129.2% and 101.1% respectively, and increases the maximum vertical displacement by 14.3%, 17.7%, 8.3% respectively. The safety coefficients of the assembled lining all meet the requirements of the specification, and the joint stiffness has little effect on the lining safety factor.
Experimental Study on Smoke Exhaust of Circular Fire Lane in Underground Vehicle Base of Urban Railway
Authors: Liu Xin , Lu Shichang , Huang Yiliang 
Published: March 2020

Abstract
To discuss the natural ventilation design parameters of fire lane for underground car parking, a full scale experiment is adopted in this study to analyse the heat release rate and minimum clear height of underground fire lane. As a supplement, FDS numerical simulations are carried out to further study the smoke exhaust effect of natural ventilation under different external wind speed. Analytical results of full scale experiment and FDS numerical simulations show that the natural ventilation of underground circular fire lane of this case can effectively discharge the flue gas due to combustion. Through the results of this study, the natural ventilation design parameters of fire lane for underground car parking are determined primarily, which will provide reference for the fire protection design and approval of the underground car parking in the future.
Finite element analysis on the support system of cast-in-place continuous box girders for high-speed railways
Authors: Lu Mingqi , Yan Yu 
Published: March 2020

Abstract
Continuous box girders of high-speed railways are constructed by the cast-in-place method, which often need to provide a supporting structural system to bear the upper construction loads. Therefore, it is necessary to ensure the structural safety of the supporting system during the construction. In the past, the calculation of supporting structures was usually only analyzed on a single member, and the method cannot take into account both the overall structure and partial members. In this paper a finite element analysis method for the overall calculation of the supporting structure was proposed and was applied in a practical project. It can be seen from the case analysis in practical engineering that the proposed method can not only consider the overall stability of the supporting structure system comprehensively, but also be used for the calculations of the deformation and stress of specific members. That indicates the method is feasible.
Research on Variation Law of Back-Calculation Modulus of Asphalt Pavement Layer
Authors: Guo Licheng , Zeng Guodong , Yan Xiangpeng , Wu Wenjuan , Wei Jincheng 
Published: March 2020

Abstract
Based on in-situ FWD testing and laboratory dynamic modulus test, the influence of loading level, position and pavement temperature on FWD back calculated modulus and the relation between bacalculated modulus and dynamic modulus was analysed. The structure combination of asphalt layer was determined based on pavement temperature profile and the composite modulus was calculated based on laboratory modulus test and in-situ measured pavement temperature. The results show that loading level had little influence on bacalculated modulus and testing position had much more influence on bacalculated modulus than loading level. The backalculated modulus and composite modulus decreased with temperature increase, when temperature was low backalculated modulus was greater than composite modulus, when temperature was in room temperature backalculated modulus was equal to composite modulus and when temperature was high backalculated modulus was less than composite modulus. For relation between bacalculation modulus and temperature, temperature correction coefficient for bacalculation modulus was developed and for relation between backcalculation modulus and composite dynamic modulus, correction coefficient model between them was developed.
Risk Analysis of a Railway Station in Shenyang with Cover Excavation and Top-Down Method
Authors: Wang Fengchi , Chen Jiaxi , Wen Yizhen 
Published: March 2020

Abstract
In this paper, for the water-rich sandy soil layer, ABAQUS finite element software is used to simulate the actual engineering background and the impact of different construction stages on different risk terms. The results shown that the settlement curve shows a large amount of soil settlement near the foundation pit, far the tendency of the settlement of the soil at the foundation pit is smaller; during the construction process, the vertical stress distribution of the entire soil changes; as the excavation depth of the subway station gradually increases, the settlement of the hotel increases accordingly, and The amount of settlement near the station side is always greater than that far from the station side; the force form of the ground connecting wall is consistent with the simplified diagram of the equivalent beam theory. And as the excavation depth of the foundation pit increases, the position of the earth pressure zero point gradually decreases.
Application Research of BIM Technology in Subway Power Supply and Distribution Construction
Authors: Dang JiaoTe , Zou Chao 
Published: March 2020

Abstract
In recent years, with the great attention and vigorous promotion of BIM technology in relevant departments, the application and research of BIM technology has brought huge economic benefits to the development of the construction industry in China. Even so, the application of BIM technology in the field of urban rail construction is still in the exploration stage. Taking “X subway station” as an example, through the analysis of the difficulties in power supply and distribution construction and the surrounding environment of subway stations, fully integrates the advantages of BIM technology, including 3D visualization, construction simulation, work coordination and information sharing. This paper puts forward the application of BIM technology in power supply and distribution equipment hoisting, cable laying, parametric design of family components, visual construction guidance and information management. Through the BIM technology of information management, the smart construction and lean management of urban subway construction can be realized, thus verifying the good application value and development prospect of BIM technology in subway power supply and distribution construction.
Analysis on the Parameter of Transition Section of Metro Trapezoidal Sleeper Track
Authors: Zhang Shenglong , Liu Li , Wang Wenbin , Li Yulu , Wei Zhiheng , Zhou Yongzhi 
Published: March 2020

Abstract
The length of transition section of Metro trapezoidal sleeper track bed affects the overall stiffness of the track. This paper establishes the Metro vehicle-rail coupling model and compares the calculated results of the trapezoidal sleepers of different transition lengths with the field measured data to verify the correctness of the model. The calculation results show that: The maximum vertical displacement of the track bed at the length of 0, 3, 6, and 9 meters is 2.55, 2.53, 2.01, and 1.92 mm, respectively, the maximum vertical displacements of the transition rails at the length of 0, 3, 6, and 9 meters are 2.53, 2.44, 2.31, 2.30 mm, respectively, the maximum rotation angles of the 0, 3, 6, and 9 meters transition sections are 1.01 rad ‰, 0.96 rad ‰, 0.90 rad ‰, 0.84 rad ‰, respectively. Considering the safety of the track and other factors, the length of the trapezoidal sleeper transition section should not be less than 9m.
Study on Vibration Isolation Effect of Periodic Pile Arrangement on Subway Ground
Authors: Zhang Shenglong , Wang Wenbin , Wu Zongzhen , Dai Yuanting , Li Yang , Zhou Anguo 
Published: March 2020

Abstract
For the environmental vibration caused by urban rail transit, this paper proposed a new type of periodic vibration isolation pile as the path vibration isolation measure. The finite element model is used to analyze the vibration damping performance of the periodic pile under the impact of the subway ground source. The measured vibration source strength is used as the excitation input to study the effects of different buried depths and different numbers of rows on the damping effect of the piles. The calculation results show that under the impact of the subway vibration source, the maximum Z-magnitude of the free-field vibration increases exponentially with the increase of the distance; the optimal arrangement of the periodic vibration isolation piles is: pile length: 14 m, number of rows: 3 and arranged close to the vibration source; the vibration damping effect is more than 5 dB within 15 m behind the pile.
Simulation Analysis of Mechanical Behavior during Treatment Construction of Tunnel Collapse
Authors: Zhu Junxun , Song Xie , Li Yuanxiang 
Published: March 2020

Abstract
Combined with Shenjiashan tunnel collapse accident in Guanggan highway, the paper analyzes the construction simulate the mechanical behavior of rock collapse segment caused stress field, displacement field and variation of the plastic zone calculated by FLAC3D numerical software. The conclusions are as follows: (1) The maximum tensile stress occurs in the vault 60°range and the central backplane while the maximum compressive stress occurs in the middle part of the foot of the tunnel arch; (2) Vault subsidence maximum displacement is mainly distributed in the range of 60°vault, floor uplift maximum displacement is mainly distributed in the 1/3 of the central bottom. (3) As the excavation proceeds, the central cavity collapse begins to appear plastic zone (tensile yield based), the arch plastic zone (shear yield based) significantly increase the scope and depth of rock to develop. If unchecked, the arch part of shear failure may occur. The results show that the support system of advance pipe shed support +cavity grouting reinforcement + steel arch played an active role in the collapse of governance throughout the process, and the foot of the tunnel arch and vault 60°range are the focus of the site in support of this collapse treatment construction.
Tunnel Design for Suzhou 3rd Metro Line across Jinji Lake
Authors: Zhang Sijiang , Wang Shijun , Li Wei , Wang Jun , Chen Yuhong 
Published: March 2020

Abstract
This article aims to make a preliminary design for the tunnel of Suzhou Metro Line 3 crossing the Jinji Lake. It describes the key factors to consider. First, select the appropriate route and the model of the shield machine for the specific geological conditions, and then analyze the tunnel dimension, concrete segmental linin and so on. Calculate the earth pressure, water pressure and analyze the stability of the excavation face. Finally, this article deals with the problems in the construction process and corresponding solutions.
Analysis of Supporting Mechanism of Steel Arch Frame in Tunnel Collapse
Authors: Song Xie , Zhu Junxun 
Published: March 2020

Abstract
As the steel arch can withstand the rock load immediately, this is widely used in tunnel collapse treatment. Firstly, the steel arch mechanism and mechanical model in tunnel collapse supporting had been studied. Then the modeling points and solutions of the finite difference software FLAC3D were pointed out, and the effects of steel arches and steel arches with different spacings were simulated. This paper analyzed the stress field of rock, displacement field of rock and stress behavior of steel in different conditions, the following conclusions: (a) Steel arch can inhibit stress concentration of the foot arch, while the dome appears to reduce the scope of the low stress areas, and it can effectively inhibit the vertical displacement of the vault and floor; (b) The maximum axial force and bending moment were increased with the increase in the arch steel arch spacing; (c) The maximum axial force steel arch occurs mainly at the crown, while the maximum bending moment occurs mainly in the arch and vault at the waist, and arch at the moment was very small. There were basically consistent with the mechanics calculations.
Comparative Analysis of the Influence of Building Vibration on Human Comfort Caused by Blasting and Subway Train Loads
Authors: Xiong Yilei , Zhang Shenglong , Wu Zongzhen , Wang Wenbin , An Zilong , Wei Zhiheng 
Published: March 2020

Abstract
In order to compare the difference between impact of the building vibration on human comfort caused by blasting and subway train load, the finite element model is established and two kinds of excitations are applied to analyze and evaluate the dynamic response of building structure under two working conditions. The research results show that the building vibration caused by train load has a long duration and relatively low vibration amplitude; the building vibration caused by blasting load has a short duration and relatively high vibration amplitude. Both vibrational energies exceed the standard limits and have adverse effects on residents from the perspective of sustainability and impact.
Numerical Study on Comparison and Selection of Water Tunnel Section Types
Authors: Liu Qi , Zhi Chengjie , Yan Tianyou 
Published: March 2020

Abstract
In order to study the mechanical deformation response law and stability difference of surrounding rock induced by the unloading effects of tunnel excavation with different section types, the 3D numerical tunnelling simulation was conducted. The results show that the plastic zone depth and deformation value of the surrounding rock of the circular tunnel are the smallest, and its stress distribution is uniform. The plastic zone depth and volume of the surrounding rock of the horseshoe-section tunnel are slightly larger, the rock deformation is about 10% larger than that of the former, and its stress distribution is relatively uniform. However, the plastic zone depth of the surrounding rock of the gate-section tunnel is 0.7-1.2m larger than that of the circular tunnel, and plastic zone volume increases by about 28.5%. Meanwhile, the surrounding rock deformations at the sidewall and floor of the gate-section tunnel are larger, and its deformation gradient is higher. The stress concentration phenomenon at the intersection of the floor and the sidewall is also significant. Therefore, the surrounding rock stability of gate-section tunnel is considered to be most unfavourable among the three tunnel section types. In consideration of tunnel stability, construction difficulty and economy, the horseshoe section type is recommended.