bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Safety Management of Construction Site Based on BIM
Authors: Yu Zhihong 
Published: April 2021

Abstract
With the development of social economy at this stage, the construction industry has also increased certain progress, in the construction engineering construction, construction safety management is very important. Compared with the traditional construction safety management, BIM Technology can find the hidden danger in the construction project in time, and check the potential safety hazard in time, so as to ensure the safety of construction. In this paper, BIM Technology is used to manage the safety management of construction site in time and space, and the fall protection control based on BIM is studied. Hope to be able to provide a certain reference and reference for future related project safety management, so as to ensure that the overall construction safety management ability and quality of the construction project can meet the requirements to the greatest extent.
Experimental Research on the Vibration Absorption Performance of Medium Damping Fasteners in Metro Shield Tunnel
Authors: Zeng Zhiping , Guo Wuji , Ying Huatuo , Huang Xiangdong , Wu Zhipeng 
Published: April 2021

Abstract
Medium damping fasteners have the advantages of low cost, easy maintenance, and convenient in gauge adjustment, etc., which are gradually and widely used in metro construction. In order to study the performance of medium damping fasteners in a driving environment, we performed measurement on site about the vertical and lateral displacement of the rail, as well as the vertical acceleration of the rail and the tunnel wall on a straight and curved metro cross-section with medium damping fasteners. By comparing with the results of ordinary fasteners, it can be seen that: (1) The medium damping fastener has a vibration reduction effect on the vertical acceleration level of the tunnel wall in the frequency range of 6.3∼31.5Hz and 50∼80Hz; moreover, it has a vibration reduction effect on the lateral acceleration of the tunnel wall in the frequency range of 5∼31.5 Hz and 50∼80 Hz. (2) The vertical and lateral displacement of the rail and the gauge change with the medium damping fasteners are larger than those of the ordinary fasteners. (3) The maximum Z vibration level measured from the tunnel wall is most suitable for evaluating the source strength of the metro, wherein the source strength of this metro line is 88.42 dB.
Comparative Study between Chinese and British Design Codes of Cup-Lock Scaffolding System
Authors: Hao Jianbing , Qu Tianshi , Chang Peng , Bi Xuelin 
Published: April 2021

Abstract
A comparison study between Chinese and British codes for cup-lock scaffolding and formwork system were carried out. The analysis results show significant difference between these national codes regarding falsework management and design methodologies. The difference in the management is mainly focusing on whether the execution should be performed by main contractors or the falsework specialists. The difference in design, however, is the design methodologies of concrete lateral pressure on formwork, wind load and the capacity of the cup lock pipes. Mix use of different design codes can cause unreliable change of system safety margin and negative impact to the project cost. A case study is also provided to show the difference in the safety margin which can leads to opposite results if different codes are adopted in the projects.
Investigation of Structural Stress Monitoring System on Excavator under Impact Loads
Authors: Peng Liang , Chen Zhenlei , Shi Yongkang , Li Ganggang , Zheng Daiwei 
Published: April 2021

Abstract
Displacement and pressure sensors were used to measure the displacement and pressure variations of the hydraulic cylinders in an excavator under impact loads. Taking the measured cylinder displacement as a driven boundary condition, the kinematics simulation is completed in the LMS Virtual Lab. Taking the measured cylinder thrust and the simulation results of the kinematics as driven boundary conditions, the dynamic simulation of the excavator is carried out. The CAE dynamic stress analysis of the boom and arm of the excavator is performed using ABAQUS inertial release approach under the loads on the sub-structure obtained from the above multi-body dynamic simulation and the measured data, it provides a reference for the material selection of each part of excavator boom. The good agreement between the analytical and testing results demonstrates that the present method is accurate, efficient, cost effective, and able to monitor the stress status and access the health of an excavator instead of using field testing techniques.
Numerical Simulation of Borehole Slotter Layout Optimization
Authors: Li Yong-song , Ai Kai , Niu Lin-xin , Liu Wei 
Published: April 2021

Abstract
This paper briefs the basic principle, current methods and test process for measuring in-situ stress by the borehole slotter method. Studies are carried out to optimize the slot’s cutting depth and layout by means of 3D numerical simulation. Such simulation results show that when the original stress field is parallel to the slot, the required cutting depth to fully release the stress on both sides of the slot reaches its peak (16 mm). In order to avoid interaction between slots and enhance reliability, only one slot is arranged at a given drilling depth and the space between slots should generally be greater than 200 mm. Based on such results, the in-situ stress measurement was conducted by means of the borehole slotter method in an underground laboratory in Jinping. The tested rock mass is in stress concentration area in a tunnel face, and the acquired vertical component of the stress is found greater than the self-weight of the overlying rock mass. This field test shows that such test rock mass is under extremely high stress condition, which is in compliance with disked rock cores discovered during tunneling.
Experimental Study on Critical Moisture Content of Octadecylamine Modified Expansive Soil
Authors: Ao Weichao , Wang Maosheng , Liu Jiaming , Li Jie , Wu Junhua 
Published: April 2021

Abstract
Taking weak expansive soil as the research object, octadecyl primary amine (octadecylamine) was mixed into remolded expansive soil as a water repellent, and modified samples with different octadecylamine content and initial moisture content were configured. The dripping water penetration time method was used to determine the water repellency grade of the modified expansive soil, and the critical moisture content test of the modified expansive soil was carried out to analyze the relationship between different octadecylamine content and the initial moisture content of the expansive soil. The results show that with the increase of the initial moisture content, the water repellency of the modified expansive soil first increases and then decreases. When the octadecylamine content is 0.8%, the limit moisture content is 33.33%, and the peak moisture content is 29.51%. The bottom water content is 0%, and its interval value is 3.78 times larger than when the octadecylamine content is 0.2%.he above research results can provide a test basis for the engineering application of modified expansive soils.
Influence of Hollow Effect on PPV of Wall Rock under Blasting Load
Authors: Cai Jun , Qiu Xiuli , Su Ying 
Published: April 2021

Abstract
The purpose of writing this thesis is to solve the problem that the hollow effect of blasting construction affects the PPV of tunnel wall rock. Based on the law of energy attenuation and seismic wave propagation, the calculation equation of PPV of wall rock in excavation area and no-excavation area under blasting load is derived, and the variation law of PPV of wall rock under different loads is calculated by FLAC3D software. The results show that: (1) The accuracy of the calculation equation is verified by the calculation results of the software; the error between those is less than 6%; (2) In the range of twice the distance from the Heading Face, the hollow effect of wall rock is directly proportional to the load value; (3) The blasting load of 0.8MPa makes the maximum void effect concentrated in the wall rock 8m away from the face. The difference of PPV between the excavated area and the uncut area caused by void effect is 2.23 cm/s, and the quotient is 1.21 times.
A Study on Constitutive Model of the Cohesive Soil Considering Soil-Structure Interactions
Authors: Wang Haibo , Cheng Yongfeng , Lu Zhicheng , Zhu Zhubing , Xue Yaodong , Zhang Shujun 
Published: April 2021

Abstract
Transformer is key equipment in the power transmission and transformation system. When the seismic calculation is carried out, the foundation soil is generally considered to be absolutely rigid, and the bottom of the structure is considered as the fixed end, the soil-structure interaction is ignored. This paper is aimed to study the soil-structure interaction’s impact on the seismic performance of the transformer and other power facilities by carrying out cyclic shear test on cohesive soil, simulating the dynamic response of clay soil under the seismic load, and get the nonlinear dynamic characteristics parameters of the soil in the loading process of seismic cycles. On the basis of the study, the fitting equation of the dynamic shear modulus and damping ratio of the soil is put forward through analyzing the cohesive soil dynamic hysteresis constitutive model.
Mechanical Modeling of Progressive Failure of Tieshansi Slope
Authors: Kou Huanjia , Lu Yingfa , Liu Gan , Huang Wansong 
Published: April 2021

Abstract
With the rapid development of china economy, the mining environment improvement is a hot research topic. The traditional unbalanced thrust method is generalized, the partial strength reduction method (PSRM), the perfect elasto-plastic model (PEPM) and the complete process constitutive model (CPCM) are employed; the progressive failure process of a slope is simulated by the proposed generalized slice method; the safety factor of the extended slice method is closely related to deformation of a slope, the characteristics of the critical stress state movement can also revealed by the proposed generalized slice method. Taking the Tieshansi slope of Huangshi City as an example, the evolution characteristics of the physical and mechanical variables in progressive failure process of the slope are revealed by the proposed generalized unbalanced thrust method with the two sorts numerical simulations (PSRM with PEPM and CPCM); the search results show that: The proposed generalized slice methods can describe the progressive failure process of the Tieshansi slope.
The Undrained Shear Strength Evaluation of Vinh Chau Clay in Vietnam Coast
Authors: Wang Weilong , Du Wenbo , Wang Kuanjun , Wang Zhenhong 
Published: April 2021

Abstract
In the foundation design, the geotechnical engineering parameters are of great importance. As a case study, the laboratory test results of two locations (Banpu and Lac Hoa) in Vinh Chau coast of Vietnam were analysed to acquire the accurate strength for clayey soil. Due to the sample disturbance, the undrained shear strength s
u from unconfined compression test are not so reliable, while su from direct quick shear tests (DSq) are more representative in Vinh Chau. A regression analysis between the DSq tests and soil depth had been carried out, good linear correlations are provided for all the three clayey layers in Banpu and Lac Hoa, the results are relatively similar for each clay layer, indicating a same sedimentary and stress history. Furthermore, the normalised undrained shear strengths s
u/σ
v0’ presented negative linear correlation of liquidity index, and the regression equations have been provided to rapid and cautious estimation of Vinh Chau clay in the future, using the liquidity index.
The Influence of Steel Bracing on the Stability of Foundation Pit Excavation under Dewatering Condition
Authors: Chen Xiaopeng , Lu Qingrui , Jiang Xiaoyi , Liu Jinling , Li Ping 
Published: April 2021

Abstract
In order to analyze the stability of under the condition of rainfall in tunnel excavation, a Phase of foundation pit in Fuchun River as the research object, according to the engineering quality condition and the excavation depth, using ABAQUS to the groundwater seepage of foundation pit, the process for the process of the change of the bearing capacity of foundation pit excavation, foundation pit precipitation is analyzed under the condition of using steel support and steel support in both cases the stability of foundation pit, to the wall and the interaction of surrounding soils including even the wall deformation of ground surface subsidence It is necessary to set steel support in large deformation area to provide certain basis for the smooth implementation of similar projects.
Effects of Mesoscopic Structure on Crack Resistance of Asphalt Mastic and Calibration of Contact Parameters
Authors: Zheng Chuanfeng , Teng Guocui , Chen Xiangyin , Li Xuan 
Published: April 2021

Abstract
This paper investigated the effects of mesoscopic structure on crack resistance of asphalt mastic basing on the bending failure simulation with discrete element method. A Dynamic Link Library wrote by C++ is proposed for the modelling process of particle filling. Response surface and variance analysis are used to calibrate mesoscopic mechanical parameters of contact model, determine the influence of different parameters on deformation in bending failure test and the relationship between the parameters is fitted by mathematical formula. The effects of air void content and fine aggregate surface texture on crack resistance of asphalt mastic at -10 °C were studied then. It was proved that the adhesive strength and bonding area between fine aggregates co-influence the ultimate bending failure load, and the contact stiffness influences the ultimate bending deflection. Mathematical correlation formula between the radius of binding area and the critical stress that satisfies the ultimate load of asphalt mastic beam can be fitted in same form. The flexural strain energy density of asphalt mastic is increased with the decrease of air void content. The results are of positive significance for improving the mechanical properties of asphalt road in cold regions.
Analysis of Modal Characteristics of Long-Span Suspension Bridges with Ruled Surface Spatial Cables
Authors: Zhang Honglei , Xu Wenping 
Published: April 2021

Abstract
In this paper, new concepts of single-leaf hyperboloid spatial cable suspension bridges and hyperbolic parabolic spatial cable suspension bridges are proposed. Combined with the 4000 m long-span Messina Strait Bridge, dynamic modal analyses of the spatial cable suspension bridges are carried out. The results show that the spatial suspension bridges have a torsional vibration mode appearing much later, a torsional-bending frequency ratio greatly improved, a critical wind speed for flutter greatly improved, and better wind stability, as compared with the parallel suspension bridge.
Layout and Optimization of the External Prestressing Tendons of Hybrid Beam Rigid Frame Bridges
Authors: Xu Guixiu , Zeng Minggen , Su Qingtian 
Published: April 2021

Abstract
External prestressing tendon systems can be set to alleviate the problem of excessive mid-span deflection of hybrid beam rigid frame bridges in the long-term use. Based on the Anhaiwan Bridge in Quanzhou of Fujian province, the effects of external prestressing tendons on reducing the deflection of the main span and improving the stress of concrete sections were studied by the shell- solid finite element models. Then the effects of the external prestressing tendons in the steel beams and the concrete beams were analyzed respectively. The effects of each prestressing tendon were further calculated. The final optimized layout was obtained by these studies, which can be used as a design reference for the external prestressed tendons of the hybrid beam rigid frame bridge. Finally, the deflection of the steel beam of the hybrid beam rigid frame bridge was analyzed under the impact of long-term effects such as shrinkage and creep. The comparative analysis of the different tensioning schemes for the external prestress tendons was carried out in order to provide a reference for the operation and maintenance management of the bridges.
Abrasion Resistance and Rutting Resistance of Micro-Surfacing with Crumb Rubber of Dry Process
Authors: Ye Yali , Hao Yan , Zhuang Chuanyi 
Published: April 2021

Abstract
In order to improve the common micro-surfacing is easy to loose and fall off, and improve the wear-resistance and anti-rutting performance of pavement, this paper uses waste rubber powder as the filler of micro-surfacing mixture, and adopts the method of dry adding. The test of micro-surfacing with crumb rubber of dry process based on APA test was carried out at 40 °C without water. Asphalt pavement analyzer shows that the micro-surfacing with crumb rubber of dry process has better wear-resisting and anti- rutting performance.
The Deterioration Laws of Flexible Base Asphalt Pavement Performance under 1/3 Scale Accelerated Loading Test
Authors: Zhuang Chuanyi , Zhao Shuqian , Wang Baoqun 
Published: April 2021

Abstract
To study the fatigue characteristics and the deterioration laws of asphalt layer under the repeated action of wheel loading, by using 1/3 proportional scale accelerated loading equipment to test the structure of graded crushed stone base asphalt pavement that was paved, tracking, monitoring and collecting the bottom strain of asphalt layer with different wheel loading times. The results show that the bottom strain of asphalt layer undergoes a change course of first compression, then tension and finally stabilization in the process of driving wheel load rolling. Under the repeated rolling action of wheel load, the change of bottom strain of asphalt layer is basically the same as that of temperature. When the asphalt layer is damaged, the bottom tensile strain curve deviates from the temperature curve with the wheel load times. The change of asphalt bottom strain and pavement temperature slope are taken as the basis to judge whether the asphalt bottom cracks or not, which is a beneficial supplement to the long-term performance observation of asphalt pavement.
Seismic Vulnerability Analysis of Isolation Bearing for Curved Continuous Girder Bridge
Authors: Huang Bowen , Li Zhengying , Wu Peitao 
Published: April 2021

Abstract
Based on a curved continuous girder bridge project, this thesis employed the seismic vulnerability method to analyze the isolation bearings which were usually considered as the fragile member of bridge. Laminates rubber bearing (LNB) was selected for analysis. The mechanical model and damage index are determined. The vulnerability curve of the bearings could be formed with the traditional reliability method based on logarithm linear regression analysis. Determined the mechanical model and damage index of the bearing, and the nonlinear dynamic analysis model of the bridge is established. Selected ten records of earthquake and amplitude modulated according to the requirements of incremental dynamic analysis method. Then, respectively formed the bridge - ground motion random sample with the bridge random sampleThe analysis results indicated that the position of isolation bearings and the direction of seismic inputting had different level effect on damage probability of bearings.
Numerical Study on Thermal Insulation of a Roadway Tunnel at Southeast Edge of the Qinghai-Tibet Plateau
Authors: Yu Hong , Zhang Kun , Zhu Xiaoming , Tian Zhizhuo , Mu Yanhu , Bi Guiquan 
Published: April 2021

Abstract
Tunnels in seasonal frost regions are heavily affected by damage related to icing problem and cyclic freeze-thaw of surrounding rock. To mitigate frost related damage, thermal insulation is widely used at entrance and exit section of tunnels. In thermal insulation design, length of the insulated section and thickness of the thermal insulation layer (TIL) are two important parameters. In this study, a coupled mathematical model of heat and moisture transfer was built for tunnels in cold regions. Then, field observed air temperatures at entrance section of a roadway tunnel at Altun Mountain, southeast edge of the Qinghai-Tibet Plateau, were collected and analysed. Based on the mathematical model and field observed inside air temperatures, seasonal freeze-thaw of surrounding rocks of the tunnel entrance was numerically investigated with consideration of the thicknesses and thermal conductivities of insulation layer. The results showed that, within the tunnel, the air has its mean annual temperature increase and the its amplitude decrease with increase in the distance from the entrance. The significant variations mainly occurred within the section 375 m from the entrance. Without the TIL, the maximum seasonal freeze depth of surrounding rocks at the entrance can reach to 1.5 m. To ensure that the surrounding rocks do not experience freezing, the minimum thickness of the TIL with a thermal conductivity of 0.037 W/(m·°C) should be 7 cm. While when the thickness of the TIL is 5 cm, its thermal conductivity should be not greater than 0.014 W/(m·°C).
Research on Waterproof Performance of Prefabricated Utility Tunnel with Different Types of Joints
Authors: Li Liangcheng , Zhang Yongyong , Zhou Wenyan , Song Li , Li Yuankun 
Published: April 2021

Abstract
In the waterproof system of prefabricated utility tunnel, rubber gasket is usually used at the joint of adjacent pipes. The waterproofing effect of prefabricated utility tunnel joint is mostly judged by the field water injection test and the practical effect of former project. In this paper, the finite element software ANSYS is used to carry out the finite element simulation for three types of joint waterproofing of prefabricated utility tunnel. Considering the uneven settlement of utility tunnel foundation, the influence of different staggered joint installation spacing on the waterproofing of the joints is analyzed. Thus, suggestions are provided for the selection of utility tunnel joint. For the prefabricated utility tunnel with side+end face and double-side joint waterproof type, the longitudinal distance between socket joints should be constrained within 3mm after the joint is installed. It is suggested that the end face+side joint waterproof type should be used for the collapsible foundation, and the longitudinal displacement of the control socket and socket should be less than 3mm. For non-collapsible and settled foundation, double-end joint waterproof type or side+end joint waterproof type can be selected.