bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental Study on Vibration Platform under the Coupling Action of Soil-Metro Upper Cover Structure
Authors: Han Xuechuan , Tao Lianjin , An Shao , Zhang Yu 
Published: April 2021

Abstract
In order to study the seismic response law of the Upper Cover Structure station system, the shaking table test was carried out on the silty sand site with the subway superstructure system and single subway station structure as the research objects. Firstly, the general situation of shaking table test is introduced. Then, the seismic response of subway station structure is studied from two aspects including acceleration and strain, and the test results are compared. The test data show that: (1) With the increase of input seismic intensity, the acceleration peak value of soil and monitoring points of the same structure increases gradually, while the acceleration amplification coefficient decreases gradually. (2) With the increase of earthquake intensity, the tensile strain amplitude of the superstructure-subway station structure increases gradually. In the model, the tensile strain amplitude at the end of the column is the largest, followed by the side wall and the floor is the smallest. (3) The acceleration and strain of the superstructure-subway station system are less than those of the single subway station structure, in which the acceleration variation law is roughly the same. The difference of strain amplitude gradually increases with the increase of earthquake intensity, and the change rate of strain peak value gradually increases and converges.
Wind Stability Analysis of 4000m-Span Suspension Bridge with Carbon Fiber Spatial Cable System
Authors: Yuan Weiwei , Xu Wenping 
Published: April 2021

Abstract
In order to solve problems of the low utilization ratio of the material of main cable and wind instability of suspension bridges with super-long-span steel main cables, ANSYS is used in this paper to establish models of a spatial cable suspension bridge and a parallel cable suspension bridge respectively. The dynamic mode, static wind stability and flutter stability of the models are compared by the software. The results show that the spatial suspension bridge has tensional vibration appearing much later, a higher frequency of the cable system, and a higher critical wind speed and a higher critical wind speed for the flutter, compared with the parallel cable suspension bridge. Therefore, the spatial suspension bridge has better wind stability.
Traffic Accident Risk Factor Identification Based on Complex Network
Authors: Chen Yang , Deng Yuanchang 
Published: April 2021

Abstract
Identifying the risk characteristics of traffic accidents is of great significance for in-depth understanding and promotion of traffic safety. 85 serious traffic accidents were selected from the road traffic accident liability certification and serious accident reports issued by the traffic police department, and 110 risk points and 218 triggering relationships were abstracted based on network theory analysis to establish a traffic accident risk network. Analyse and compare indicators such as network density and network diameter to reveal the overall nature of the traffic accident risk network. The key risk factors of the risk network are analysed and identified using node indicators such as degree and betweenness. The results show that most traffic accidents are triggered by human factors, among which the driver factor is the main factor. Speeding and improper emergency measures are the two most important factors that need to be controlled. Based on the results of this analysis, this article puts forward management suggestions to improve the level of traffic safety.
Research Progress on Safety Control of Surrounding Rock-Support System in Deep Buried Soft Rock Tunnels
Authors: Li Jianhe , You Wanmin , Wu Song , Li Jian , Han Jian 
Published: April 2021

Abstract
The deep-buried soft rock tunnel has large deformation degree and long duration, which makes the surrounding rock-support very difficult. How to formulate effective design countermeasures to control soft rock deformation is one of the important technical problems in the design and construction of deep-buried soft rock tunnels. There are three critical problems in the research of soft rock deformation control, i.e. the bearing mechanism of the surrounding rock-supporting system of the soft rock tunnel, the safety control indexes and control standards of the surrounding rock-supporting system, and the reasonable support timing and support rigidity. Remarkable achievements have been made in the deformation control of deep-buried soft rock tunnel by theoretical analysis, field tests and numerical simulation over the past decades. By summarizing the research progress related to these three critical problems, the form of surrounding rock pressure is discussed, and the safety control indexes and standards for surrounding rock-supporting system are established. It is believed that based on the load-bearing law of the surrounding rock-support system and its safety control standards, an in-depth study of the reasonable support timing and reasonable support rigidity of the surrounding rock under different geological conditions is the critical and difficult problem for the safety control of deep-buried soft rock tunnels.
Experimental Investigation on the Sand Deposit Foundation of an Immersed Tube Tunnel by Using a Sand Flow Model
Authors: Li Bo , Fang Yingguang , Li Wei 
Published: April 2021

Abstract
Sand flow is a mainstream construction method to treat the foundation of immersed tunnel. The characteristics of the sand deposit foundation, including its size and compactness, as well as fullness degree, are key indicators for estimating the effect of foundation treatment on the immersed tube tunnel. In this study, three series of model tests were conducted. The characteristics of fullness degree and compactness were elaborated. In addition, tunnel uplift and its prevention, the effect of surface roughness of tunnel on the compactness and size of sand deposit, and the effects of different injection sequences on the fullness degree were investigated. Valuable practical suggestions were drawn from the test results. First, the incidence of tunnel uplift can be avoided by monitoring the hydraulic pressure under the bottom of tunnel with water pressure gauges. Second, the surface roughness of tunnel should be decreased to allow for a sand deposit with a large radius and consequently enhance construction efficiency. Third, the difference in injection sequences barely influences the fullness degree of sand deposit; therefore, injection sequences can be flexibly designed to provide convenience for construction.
Nonlinear Numerical Analysis on Seismic Performance of New-type Outer Hoop Box Column Joints
Authors: Pan Xiuzhen , Dou Tong , Li Hao , Chen Shiwei 
Published: April 2021

Abstract
The connection between the upper and lower structure is the key to seismic design of RC frame-lightweight steel mixed structure. This paper proposes a new type of outer hoop box column joint for this kind of mixed structure, which aims to strengthen the connection between exiting and new building, reduce the stiffness mutation and facilitate construct. In order to study the seismic performance of the new type of joint, the ABAQUS finite element software was used to carry out the numerical analysis of the new type of joint under the action of low-cycle cyclic loading with a 1/2 scale model, and the factors that affect the seismic performance were discussed in-depth. The results show that the hoop effect of the outer hoop steel plate strengthens the restraint on the core area of the joint and its surrounding members, which causes the plastic hinge position of the concrete beam to move outward, effectively protects the core area of the joint, and is beneficial to the bearing capacity of the new joint. Appropriately increasing the axial compression ratio can increase the bearing capacity, initial stiffness and yield displacement of the new joints to a certain extent.
Analytical Solution for Monopile Supported Offshore Wind Turbines Considering Soil-Pile-Water Interaction
Authors: Wang Piguang , Chang Yifu , Zhao Mi , Xi Renqiang , Zhang Chao 
Published: April 2021

Abstract
Offshore wind turbines (OWTs) are dynamically sensitive systems and vulnerable to external excitations such as aerodynamic and hydrodynamic loadings. These loadings may lead to excessive oscillation for the support structure of OWTs. Therefore, it is essential to evaluate the natural frequencies of the system to keep them away from excitation frequencies of external vibration sources. This paper investigates the natural frequencies and seismic responses of the OWT system. The soil-structure interaction (SSI) is modelled by three coupled springs and fluid-structure interaction (FSI) is simulated by the added mass. Then a closed-form solution of the natural frequencies is derived to consider the variation of cross-section. Furtherly, seismic responses of the system are obtained by mode superposition method. Effects of SSI, substructure mass and axial loading are finally investigated. The results indicate that substructure mass can significantly decrease the frequencies of the structure while axial loading plays only a small part in the process. SSI has an important effect on the seismic responses of OWTs. It is essential to consider the cross-coupling spring to analyze the seismic responses for accuracy.
Numerical Analysis on the Effect of Vital Design Parameters on the Seismic Performance of Shear Walls with Horizontal Ring Connection
Authors: Zhou Jian , Zhang Tao , Li Liming , Guo Zhipeng , Shi Qiancheng 
Published: April 2021

Abstract
Prefabricated shear walls are currently widely applied in mid-to-high-rise structures. As a new type of structural form of assembled shear walls, the ring connection assembled concrete shear wall has clear mechanical mechanism, easy construction and better performance and other significant advantages, which are gradually being applied in actual engineering. However, few systematic studies are carried on this new type of shear wall structure, and a complete theoretical system for guiding the design could not be given, especially in terms of mechanical mechanism and seismic performance, more detailed research work is needed. This paper uses numerical simulation as the main method to study the influence of different design variables such as shear span ratio, buckle size, axial compression ratio on the mechanical properties of the connection area in shear wall and the overall seismic performance of the structure. In this way, the theoretical basis for further optimizing the structural performance of the shear wall connection with ring connection.
Comparative Study on Layout Scheme of High Head Diversion Power Station----Taking the Yamu River-I Hydropower Station as an Example
Authors: Pan Shaohong , Wu Yunen , Ding Fengfeng 
Published: April 2021

Abstract
The small hydropower stations on most tributaries in the middle reaches of Salween River are mostly high-head diversion hydropower stations, and the choice of hub arrangement scheme is an important content of the preliminary construction project. Taking Yamu River-I Hydropower Station as an example, this paper compares and analyzes the layout scheme of the main hub of the project from the aspects of dam site, dam type, regulation scheme, diversion route and site selection, and summarizes the optimization ideas and characteristics of the layout scheme of the main hub of the project, so as to be helpful for the preliminary design of similar hydropower stations.
Influence of Seawards Water and Sediment Conditions on the Turbidity Maximum Zone in Yangtze Estuary
Authors: Huang Libing , Zheng Baoqiang 
Published: April 2021

Abstract
On the combined influence of runoff and tide, seawards sediment forms the turbidity maximum zone (TMZ) nearby the sandbar of Yangtze estuary. The water and sediment transport of the sandbar has important theoretical and practical significance for ecosystem, waterway regulation, and so on. According to the situation of seawards water and sediment variation, and based on the ECOMSED simulation of flow and suspended sediment dynamic process, the relation of the seawards water and sediment and the TMZ, and the law of water and sediment motion after the Three Gorges Project are discussed. It enhances the comprehension of suspended sediment concentration (SSC) variation law of the TMZ always seawards discharge. As the lower seawards sediment concentration, the SSC of the TMZ center is gradually decreasing with the increasing discharge. As the sediment concentration is higher than some critical value, the SSC of the TMZ center is gradually increasing with the increasing discharge.
The Simulation Analysis on Pressure Characteristics of Internal Leakage in Hydraulic System of Heavy Vehicles
Authors: Zhang Hongzhuang , Feng Suli , Li Yang 
Published: April 2021

Abstract
The internal leakage of hydraulic cylinder severly effects the normal operation running of hydraulic system. At present, the diagnosis approaches of internal leakage of hydraulic cylinder still have some problems. It is to make test slow when leaking or it is difficult to diagnosis when leaking weakly. A method to determine internal leakage using pressure change characteristics is proposed. Based on hydraulic system simulation software Automation Studio 6.1, this paper makes simulation analysis on normal status and fault status of hydraulic system operation, aiming to achieve time domain and frequency domain features. Accompanying with experimental test, the results of simulation are consistent with experiment results, which provides a new way for the detection for internal leakage of hydraulic cylinder.
Wind Tunnel Experiments on Flight Characteristics of Windborne Debris upon Low-Rise Building
Authors: Sun Songtai , Huang Peng , Qiao Haoshuai 
Published: April 2021

Abstract
In strong wind events such as hurricanes and tornadoes, windborne debris is the main cause of disasters and buildings destruction. Roof slabs, tiles, and other enclosure components may become potential windborne debris. In the present research, a series of wind tunnel experiments were carried out to investigate the flight characteristics (i.e., the trajectory distribution and the flight speed) of debris released at different positions on the windward roof of a low-rise building. The results show that the initial position of debris has an important influence on the trajectory distributions and flight speed. Along the Y-axis, the trajectory distribution of debris released near the central axis of the roof is wider than those of debris whose initial positions lying closer to the side. As for debris which is closer to the central axis of the roof, a wider trajectory distribution in the vertical direction and higher flight speed are observed when the debris is released closer to the windward eave. And for debris whose initial positions have the same distance from the windward eave, the closer the initial positions to the central axis, the lower the total speed is. The total speed of the debris is mainly composed of the vertical (Z-axis) speed component at the beginning of the flight, and gradually, the proportion of horizontal (X-axis) speed keeps increasing with time passing by.
Application Research of Terrain Mapping Based on RIEGL 3D Scanning System
Authors: Wu Yunen 
Published: April 2021

Abstract
Based on the RIEGL 3D scanning system, this paper studies the key technical methods of 3D laser scanning technology in the whole process of data acquisition, data processing and topographic mapping, and forms an effective technical route of 3D laser scanning technology in large scale topographic mapping.The transformation relationship among the coordinate system of the scanner itself, the engineering coordinate system, the global coordinate system and the image machine coordinate system is explained.The point cloud data registration, “non-topographic point” filtering technology, arbitrary point cloud data network construction technology and other technical methods are introduced.Better results can be achieved through multi-station acquisition and the combination of GPS and ground 3D laser scanning system.
Distribution Characterization Study of the Heavy Metals for a Mining Area of East Tianshan Mountain in Xinjiang Based on the Kriging Interpolation Method
Authors: Du Qingsong , Li Guoyu , Zhou Yu , Wu Gang , Chai Mingtang , Li Fayong 
Published: April 2021

Abstract
In order to understand the impact of mining development on the environment, a metal mine at east Tianshan Mountain in Xinjiang province was used as the object of study. The heavy metal content data were obtained from field sampling and indoor measurements, and the data were compared with the heavy metal background values, applying the geostatistic method and Kriging spatial interpolation theory to map the heavy metal distribution in the study area. The results show that the overall heavy metal contamination in the mining area is serious, with significant accumulation of As, Cd and Cr, which is a threat to local human and animal health. And there are obvious correlations and synergies between the distribution of these heavy metals, mostly showing positive correlations, which should be taken into more account in the subsequent environmental rehabilitation of the mine site.
Experimental Research on the Rheology Slip Damage Mechanical Properties of Sandstone under the Dynamic Loading
Authors: Hu Hua , Wu Xuan 
Published: April 2021

Abstract
The soft sandstone is taken as samples, and the RLW-2000M triaxial rheological testing machine is used as the main equipment to test the axial stress-strain, the axial rheological deformation in this paper. The axial strain is selected as damage variables, the damage degree expression is derived, and the effect of each factor on damage degree is studied. Research results show that axial deformation increases with the passage of time, and the hysteresis curve change from sparse to dense under the action of the dynamic loading. The axial deformation increase with the increase of the dynamic loading amplitude, and it increases with the decrease of frequency. The damage degree of specimen tends to be stable after mutation and increases with the increase of the dynamic loading amplitude. The research results will provide the scientific basis for us to disclose the rule of rheology-damage evolution of sandstone under the action of dynamic loading.
Experimental Research on Shear Strength Characteristics of Unsaturated Coal-Bearing Soils under Dry-Wet Circulation
Authors: Fan Yakun , Zheng Mingxin , Wu Junhua 
Published: April 2021

Abstract
In this paper, the shear strength experiment of unsaturated coal-bearing soil under dry-wet circulation was carried out on the conventional direct shear apparatus, the relationship between shear strength and its index parameters and water content of unsaturated coal-bearing soil was obtained. The tests show that the total stress shear strength of unsaturated coal-bearing soil was obviously affected by moisture content, and the shear strength decreases with the raise of moisture content, and the total cohesion and total internal friction angle of unsaturated coal-bearing soil are greatly affected by moisture content, which decreases with the raise of water content.
Research on 3D Hydrodynamic Model Based on Adaptive Mesh
Authors: Wang Ming , Dong Huili , Zhang Fangxiu 
Published: April 2021

Abstract
In this paper, a three-dimensional hydrodynamic model based on adaptive mesh was established. The cubic mesh based on octree structure was adopted to solve the three-dimensional Navier-Stokes equation by the step-by-step pressure decomposition method, which realized the automatically encryption and coarsening of the grid. The calculation of three-dimensional square cavity flow showed that the calculation results of this model are in perfect agreement with those of Chen, and the calculation accuracy is high. Through the calculation of three-dimensional flow around a cylinder, the model can automatically encrypt the grid near the complex boundary, and can refine and coarsen the grid reasonably through the vorticity field. Meanwhile, it can also reduce the calculation amount and improve the calculation speed while maintaining the calculation accuracy.
Variety-Specific Soybean Yield with Respect to Nitrogen-Fixing Symbiosis on the Northern Boundary of the Crop’s Geographical Range
Authors: Churakov A A 
Published: April 2021

Abstract
The effects of inoculating nitrogen-fixing symbionts on soybean yield were tested in the experimental field of the Krasnoyarsk State Agrarian University, 50 km north of Krasnoyarsk. Strain 634 was tested in 2017–2018 on the Zaryanitsa variety. Strain 634 and Spontaneous, discovered in Krasnoyarsk forest steppes, were tested in 2019 on the precocious Zaryanitsa and Eos varieties (Siberian ecotype). Treating Zaryanitsa soybean with Strain 634 induced a yield of 0.197 kg/m2 compared to the control yield of 0.167 kg/m2 (p = 0.037). The number of nodules peaked in Zaryanitsa inoculated with the biological Spontaneous: 104 nodules per root. Spontaneous reduced the height of Zaryanitsa plants (p = 0.0606) but increased the seed weight (p = 0.0282). Eos was inoculated with two strains; compared to the controls, it had lower productivity metrics such as the number of branches (p = 0.0771), beans (p = 0.0483), seeds (p = 0.0142), and seed weight (p = 0.0381). However, the preservation rates were 16% higher in case of Strain 634, 22% in case of Spontaneous. Factor analysis (varimax rotation) identified two factors: one comprised the indicators related to the development of photosynthesis organs (the number, weight, and area of leaves) and to nodulation (the number, weight, and moisture of nodules). The other one comprised the yield structure components and the number of plants per unit of area. Eos yield rose by 0.02 kg/m2 and 0.048 kg/m2 when inoculated with Strain 634 and Spontaneous, respectively.
The Numerical Implementation of the Method for Determining the Thermal Impact of Gas Blowout Fire, Considering the Wind Direction
Authors: Dzhumagaliev R M , Kokushev O K , Dzhumagaliev T R 
Published: April 2021

Abstract
The article provides a method for calculating the irradiation coefficient of a gas flame, inclined under influence of the wind, an arbitrarily located object in relation to the ground, the distance from the fire and the direction of the wind. The flame is brought to a circular inclined cone. A person was selected as a potential object of risk. The calculation of the irradiance coefficient was made by a numerical method. To check the adequacy of the adopted model, a calculation was made according to the well-known formula for approximating a flame by a vertical cylinder, considering it a particular case of a cone. When comparing the calculation by numerical integration method with calculation by formula, the match of results was found. We also provide directions for further research in this area.