bluuebunny/crossref_metadata_2025_split huggingface dataset:
Deformation and Numerical Simulation Analysis of Deep Foundation Pit Excavation of Nanjing Yangtze River Floodplain Metro Station
Authors: Liu Jiangtao , Nie Meijun , Li Cunjun , Yan Jinpeng 
Published: April 2021

Abstract
Based on the foundation pit excavation construction of a subway station under the soft soil layer of the Nanjing Yangtze River floodplain, Numerical simulation of foundation pit construction process is carried out to study the deformation law of surrounding soil and surrounding structure during foundation pit construction. The research shows that the established finite element numerical model can better predict the structural and stratum deformation caused by the excavation of the foundation pit; the lateral displacement of the ground wall and the ground settlement behind the wall based on different constitutive models are different, but the overall trend is the same. The lateral displacement of the diaphragm wall presents a “bulging” pattern. The surface settlement around the pit shows a settlement trough at a certain distance from the connecting wall. The horizontal displacement of the diaphragm wall increases with the increase of the excavation depth of the foundation pit, and the maximum horizontal displacement occurs above the excavation surface. The conclusions obtained have certain guiding significance for subsequent construction and parameter optimization.
Review on Research Progress and Application of Reinforced Soil
Authors: Cui Meng , Hu Linna , Fu Xiao , Liu Hailin 
Published: April 2021

Abstract
Reinforced soil structure is particularly popular in the field of construction engineering because of its remarkable social, economic and environmental benefits, and is one of the current research hotspots. As a new type of geotechnical structure, reinforced soil has its mechanical characteristic affected by various complex factors, such as the type of reinforced material, the length of the reinforced material, the spacing between the reinforcements, the water content, the drawing directions, the earthquake, the traffic load and so on. Based on studying papers and books, this paper expounds the structural strength characteristic, the interface characteristics and stability of reinforced soil from three aspects, which include basic theory, experimental research and numerical analysis, and the applications of reinforced soil structures in geotechnical engineering are listed. Finally, in view of the current research status and development trend of reinforced soil, the focus and direction that need further research in the future are put forward.
Theoretical Study on One-Dimensional Consolidation of Underconsolidated Marine Clay Induced by Ramp Loading
Authors: Yu Ziye , Wu Wenbing , Zong Mengfan , Zhai Guojun , Xu Meijuan 
Published: April 2021

Abstract
The position of maximum excess pore water pressure is found to be a critical indication in the design of horizontal drainage systems for saturated soil, controlled by the drainage capacity at the boundaries and the self-weight of soil both of which are often ignored. In sea reclamation works, however, the dredged clay used is mostly under consolidated and will undergo the self-weight consolidation. In this paper, an exponentially time-growing drainage boundary condition is adopted, based on which the analytical solution of one-dimensional consolidation of underconsolidated soil under a ramp loading is obtained by using the eigenfunction expansion technique. The obtained solution is verified and a parameter analysis is later carried out. It turns out that when considering the self-weight of the soil subjected to the ramp loading, the variation of the position of maximum excess pore water pressure over time depends heavily on the symmetry of the boundary conditions. The smaller the over consolidation ratio (OCR<1), the shorter the distance of the plane of maximum excess pore water pressure to the bottom surface of the soil layer. Moreover, the larger the loading rate, the higher the plane of maximum excess pore water pressure at the loading stage.
Numerical Analysis of Deep Foundation Pit Excavation Process
Authors: Jiang Xiaoyi , Lu Qingrui , Chen Xiaopeng , Liu Jinling , Li Ping 
Published: April 2021

Abstract
Based on the background of a subway project to be built in a certain city, finite element analysis software Abaqus 6.1.4 was used to simulate and analyze the displacement changes of deep foundation pit excavation, underground diaphragm wall, steel support and other supporting structures. The results show that the maximum horizontal displacement of the diaphragm wall and the vertical displacement (settlement) of soil around the foundation pit occur at the midpoint of the long side of the foundation pit. The maximum horizontal displacement of the underground diaphragm wall reaches 13.9 mm, and the maximum horizontal displacement occurs 16m from the top of the wall. The maximum vertical displacement (settlement) of soil around the foundation pit is 9.5 mm and occurs 8m away from the edge of the foundation pit. For the deep foundation pit with large length and width, the deformation of the middle point and the end section of the long side of the underground diaphragm wall is relatively large compared with other positions, so a reasonable alarm value should be set separately. The axial force of steel support on the excavation layer will increase significantly, which is a focus of close attention in design and construction. The above results can provide some reference for the design and research of deep foundation pit excavation support in soft soil area.
Influence of Shield Tail Clearance on Surface Settlement during Shield Construction in Soft Soil Area
Authors: Li Ping , Lu Qingrui , Chen Xiaopeng , Jiang Xiaoyi , Liu Jinling , Xie Binbin 
Published: April 2021

Abstract
The shield construction process of shield tail gap caused by formation damage, the formation damage caused by the settlement is as long as the part of tunnel subsidence analysis, therefore in the finite element software analysis of shield construction settlement value, the shield tail clearance simulation is an important link in the entire model, this article analyzes three common finite element simulation method, shield tail clearance displacement convergence method based on non-uniform distribution and actual matches are higher than layer such as generation method and stiffness discount subtraction. Finally, the displacement convergence method is used to simulate the grouting effect of shield tail on the surface settlement.
Study on Surface Settlement of Water-Rich Sand Pebble Bed Shield Construction in Nanchang
Authors: Xie Binbin , Lu Qingrui , Chen Shijun , Li Ping , Jiang Xiaoyi , Liu Jinling 
Published: April 2021

Abstract
Water-rich sand layer is a kind of common bad geology that is difficult to control and has great harm. It is easy to cause serious problems such as collapse, water inrush and sand burst, and surface collapse, etc. Through the analysis of shield tunnel of water-rich sand layer in Nanchang city, a numerical model was established to study the influence of different working conditions on surface settlement. The results show that the influence of boundary conditions should be considered more than other soil layers, the influence of different grouting pressures on the surface settlement of the sand and gravel soil layer is not obvious, the surface settlement caused by the water level reduction is greater than that caused by the water level reduction, and increasing the grouting pressure has a certain control effect on the ground settlement after precipitation.
Supporting Condition Evaluation Method of Cable-Stayed Bridges Based on Modal Assurance Criterion
Authors: Ma Yaozong , Zou Qian , Wang Longlin 
Published: April 2021

Abstract
In order to identify the supporting condition of cable-stayed bridges with semi-floating system by using the measured mode shapes, this paper proposed an actual supporting condition evaluation method of cable-stayed bridges based on the indicator of modal assurance criterion (MAC). Firstly, the measured mode shapes and theoretical mode shapes under different supporting conditions could be obtained. Then the corresponding MAC indicator values were calculated, which would be compared to evaluate the supporting condition of bridges. The experiment results revealed that the MAC values between the measured mode shapes and theoretical mode shapes were in good agreement with MAC values above 0.9, which indicated that the actual structural support condition was consistent with the theoretical calculation condition. The experimental results of actual bridges proved that the proposed method in this paper is feasible and effectiveness.
Influence of Subgrade Splicing Mode and Width on Differential Settlement of Pavement Subgrade
Authors: Liu Jiarong , Wang Kai , Cui Shiping , Shu Shiqi 
Published: April 2021

Abstract
In order to study the influence of subgrade splicing mode and width on differential settlement, the large-scale finite element analysis software ANSYS is used to establish the subgrade settlement model, in which the parameters are determined according to the actual subgrade width, widening mode and engineering geological conditions of the widening project of Anxin expressway. The influence of unilateral widening and bilateral widening on the settlement of widened subgrade, the maximum differential settlement on the top of widened subgrade and the influence on horizontal displacement of widened subgrade are systematically evaluated. The results show that for unilateral and bilateral widening, with the increase of widening width, the settlement of the middle line of the old road gradually increases, and the double side widening can make the weight of the widened embankment distribute to both sides of the old subgrade, which greatly improves the settlement coordination of the old and new Subgrade, and is beneficial to the stress of the pavement structure.
Experimental Study on the Characteristics of Air Voids of Asphalt Mixture under Vacuum Compaction
Authors: Hu Min , Jia Wenyuan , Liu Zhonghua , Zhang Jianxiong , Yao Yunshi , Shen Zhenzong 
Published: April 2021

Abstract
In order to improve the compaction quality of asphalt mixture, a vacuum compaction technology is studied. Under different vacuum degrees (0 MPa, -0.04 MPa, -0.06 MPa, -0.08 MPa and negative pressure), the vacuum compaction process was used to prepare asphalt mixture samples and their characteristics of air voids were tested. The test results show, when the vacuum degree increases from 0 to -0.08 MPa, the air voids decrease with the increase of vacuum degree. The middle and upper air voids are small, and between 9-25 layers, average air voids under vacuum degree of -0.08 MPa and negative pressure is 13.2%, which is 41.6% lower than that under non vacuum; The average diameter is controlled at 1.88∼2.19 mm under vacuum degree of 0.08 MPa and negative pressure, which is 43.3% less than that under non vacuum. Those results show that vacuum compaction can effectively improve the characteristics of micro air voids of asphalt mixture, which will also improve the compactness.
Experimental Study on Interlayer Mechanical Properties of Semi-Rigid Base Asphalt Pavement Using Interlayer Treatment Method
Authors: Jia Wenyuan , Hu Min , Liu Zhonghua , Li Taotao , Chen Shibin , Gao Jun 
Published: April 2021

Abstract
In order to improve the interlaminar mechanical properties of semi-rigid layer and asphalt layer in asphalt pavement, the method of the base surface treated pits was studied and their properties at different temperatures were explored. The experimental results show that at 20 °C, compared with the base surface untreated, the interlayer shear strength of the base surface treated 9 pits of q>20 mm was increased by 27.95%, and the tensile strength was increased by 57.51%. Within a certain range, increasing the diameters of the pits can improve the bonding effect between the layers. In the temperature range of 0 °C-40 °C, the interlayer bonding effect of the base surface treated 9 pits of q>20 mm and spread oil is been better than the other three interlayer treatment methods in the experiment. These results show that the base surface treated the pits can form mortise structure, which can improve the mechanical properties between layers and weaken the negative effect of high temperature on the adhesion between layers.
Research on Application of Chinese Codes in Asphalt Pavement Design of French Speaking Countries
Authors: Tang En-kuan , Cai Kang , Qu Lian-feng , Zhang Run-yao , Zhang Peng 
Published: April 2021

Abstract
In this paper, based on the calculation of asphalt pavement of North-South Expressway in Algeria, the applicability of Chinese code in asphalt pavement design of French speaking countries is studied. Although there are differences in pavement design methods between China and France, by adjusting the pavement design parameters and asphalt mixture, it can be transformed into representative indicators applicable to the Chinese code in a targeted manner. The Chinese code was used to design and check the asphalt pavement of the North-South Expressway in Algeria. The results show that it is feasible to design asphalt pavement in French speaking countries by using Chinese codes, which provides basis and reference for the application of Chinese codes in French speaking countries.
Disease Analysis for “Single Plate Bearing” in Plate Girder Bridge and Its Strengthening Scheme
Authors: Zhao Man , Li Yiqiang 
Published: April 2021

Abstract
The phenomenon of “single plate bearing” is one of the diseases in plate girder bridges. In order to study its mechanical characteristics and strengthening schemes, with the help of finite element software ANSYS, “single plate bearing” of plate girder bridge is simulated numerically in this section. Firstly, models are simulated with beam element, and transversal distribution rule of load is analysed. Then according to the mechanical behavior of plate girder bridge and the reason leading to “single plate bearing”, five strengthening schemes are proposed to delay or avoid “single plate bearing” and their spatial models are built with solid element Mechanical behaviors such as displacement, stress are contrasted and analysed. Furthermore, transversal stress at hinged joints is analysed in detail, and it is proposed that the adhesive strength between new and old concrete should be applied to test transversal stress at hinged joints. At last according to the merit and demerit of five strengthening schemes, feasible schemes for “single plate bearing” are given.
The Formation Mechanisms of Road Traffic Noise in Urban Historic Districts: A Case Study of Grand Tang Dynasty Ever-Bright Block in Xi’an, China
Authors: Ding Xin , Li Bofeng , Zhang Qi 
Published: April 2021

Abstract
The formation mechanisms of road traffic noise in urban historic districts are comprehensively studied through analyzing the superposition of influencing factors with the characteristics of historical districts. Then both the gray related theory and spatial syntax theory are used to construct the screening method of road traffic noise causes which can combine accurate quantitative data and spatial structure selection probability, while the empirical study of Grand Tang Dynasty Ever-bright block in Xi’an is conducted then. The research indicates that the formation mechanisms of road traffic noise in urban historical districts are due to complex stratification in which the traffic flow of motor vehicles, non-motor vehicles and pedestrians affect the noise formation by individual or as a whole under different conditions, as well as the disturbances of landscape nodes and road attributes. Moreover, it is believed that accurate identification of non-quantitative factors is the key to design road traffic noise screening method in historical districts rather than motor vehicle traffic flows.
Influence of Unit Length on Pavement Roughness Evaluation Results Based on Driving Vibration Data
Authors: Chen Guanghua , Zhang Jinxi 
Published: April 2021

Abstract
The method of evaluating pavement roughness with vibration acceleration data collected by smart phones is influenced by many factors, of which the length of pavement evaluation unit is an important one. In order to explore the influence of evaluation unit length on pavement roughness evaluation result with vibration data, this paper carried out a driving experiment, used the self-developed smart-phone APP acquisition running-vehicle vibration of data, used the multi-function checkout automobile detection of pavement smoothness, and established the relationship models of pavement roughness — vibration index and speed index when the evaluation unit length are 100 m, 500 m and 1000 m respectively. The results showed that when the unit length is 1000 m, the accuracy of the evaluation model is the highest, and the determination coefficient reaches 0.876. The verification experiment also proved that the evaluation model has good accuracy and stability. And also it was showed that the accuracy of the pavement roughness evaluation model increases with the increase of the length of the evaluation unit, which may be related to the matching error between the vibration data and the pavement roughness. How to improve the accuracy of the evaluation results about the short unit is the key content to be studied in the future.
Study on the Efficiency of Prestressing Application in Prestressed Composite Bridges
Authors: Qi Bing , Zhang Chao , Dong Shun , Chen Quansheng , Tang Jian 
Published: April 2021

Abstract
In order to study the proportion of prestressing between concrete slab and steel girder in different forms of prestressed composite bridges, this paper analysed the distribution of prestressing between concrete slab and steel girder when conventional prestressing method and post-tensioned prestressing method were used in the negative moment region respectively, against the background of a certain project. The results showed that 43.65% of the total prestressing applied by the conventional prestressing method was transferred to the steel girder, and nearly half of the prestressing tendons failed to reduce the tensile stresses in the concrete slab; the use of post-tensioned prestressing reduced the number of prestressing tendons by 65.6% relative to the traditional prestress application method.
Research on the Deformation Behaviour of the Track Interlayer Structure during the Deviation Correction of the Offset Ballastless Track
Authors: Liu Hao , Liu Jing , Jiang Ziqing , Wang Hanmin , Zhang Yongchao , Song Song , Li Ying 
Published: April 2021

Abstract
In view of the problem that the large deviation of the ballastless track structure affects the smoothness of the line due to the complex geological environment, in order to realize the deviation correction and repair of the offset ballastless track within the skylight time to restore the smoothness of the line, we researched the technology and process of ballastless track structure deviation correction and repair based on polymer chemical debonding, and the deformation and evolution behavior of the ballastless track interlayer structure during deviation correction and repair. The results show that by polymer chemical debonding and lifting technology, it ensure that the track structure is completely separated from the cement graded gravel layer, and significantly reduce the adhesion and friction between the base plate and the surface of the foundation bed, which creates conditions for the successful implementation of deviation correction. By the step-by-step loading and synchronous push control, the track slab and support layer are uniformly stressed and deformed synchronously. There is no track structure cracking loss, interlayer bonding failure or dislocation damage. The engineering tests show that the developed deviation correction technology can ensure the deviation correction and repair of the offset ballastless track structure without damaging the ballastless track structure.
Effect of Carbon Fiber on Microwave Deicing Efficiency of Pavement Concrete
Authors: Meng Xin , Bai Erlei , Xia Wei , Huang Zhe , Wang Zhihang 
Published: April 2021

Abstract
Snow and icing on roads in winter will bring serious consequences to traffic safety. Microwave deicing, as a new type of environmentally friendly road surface deicing method, has the characteristics of environmental protection, pollution-free, and high ice removal rate, but its low deicing efficiency limits its use. Carbon fiber has good electrical and thermal conductivity, wear resistance, etc., and can provide a new composite material for road surface deicing. Taking carbon fiber concrete as the research object, the effect of different carbon fiber length on the microwave heat absorption efficiency of concrete is studied. The results found that: as the length of carbon fiber increases, the temperature rise at the same time increases exponentially, the higher the efficiency of carbon fiber concrete for absorbing and heating.
Full-Scale Model Experimental Research on Concrete Construction Technology of Steel Shell Immersed Tube Tunnel
Authors: Xia Fengyong , Song Shenyou , Xu Wen , Zuo Wenqiang , Xie Biao 
Published: April 2021

Abstract
A full-scale model experiment was carried out to research the effects of the Self-Compacting Concrete (SCC) construction technologies including SCC working performances, casting speeds and the arrangement methods of vent holes on the filling quality of the steel shell immersed tube tunnel compartments. The experimental results showed that in order to guarantee the bearing capacity of structure mainly by reducing the voids as many as possible to meet the related requriements of Guide, the total area ratio of voids with the depth more than 5.0 mm in the whole top surface of compartments must be less than 5%, the initial slump flow of SCC should be improved to 670±50 mm on account of the flowability loss caused by the particle migration of coarse aggregates during pumping and at least ten vent holes distributed around the top plate of a steel shell compartment parts of which were located on the both ends of T ribs far from the pouring holes are needed, simultaneously the appropriate pouring speeds of SCC are respectively 30 m3/h and 15 m3/h when the distances from fresh concrete level to compartment roof are more and less than 20 cm.
Vibration Measurement and Analysis of High Speed Railway Based on Wavelet Analysis
Authors: Song Rui 
Published: April 2021

Abstract
In order to better study the vibration characteristics of railway viaduct, field test and pulsation test are carried out for the bridge vibration caused by the operation of a high-speed railway train. The natural vibration frequency of the bridge is analyzed, and 1 / 3 octave analysis and wavelet analysis are carried out for the vibration signal caused by the train excitation. The analysis results show that: the measured value of vertical frequency of bridge is close to the theoretical value, and the measured value is slightly larger than the theoretical value; the wavelet analysis results show that the vibration energy of the measured points is mainly concentrated in the third frequency band (15.625 ∼ 31.25 Hz), the fourth frequency band (31.25 ∼ 62.5 Hz) and the seventh frequency band (250 ∼ 500 Hz). Compared with the urban viaduct, the vibration and noise analysis of high-speed railway bridge should be appropriately extended to 500 Hz. The time-frequency diagram shows that the main vibration frequency range of the bridge is about 30-60 Hz.