bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experiment Study on the Compression Resilience of Loess
Authors: Xu Yali 
Published: September 2020

Abstract
Due to structure form of particles and the characteristics of loess, such as high strength and incomplete consolidation, in order to research the influence of structure on compression and resilience characteristics of loess, the compression resilience test for undisturbed soil and remoulded soil and compression resilience recompression test for undisturbed soil is carried out under five kinds of different water content. The results show that: the structure has great influence on the compression and resilience characteristics of loess, especially after or before the structure damage. And the structured yield stress is bigger, resilience characteristics is more and more strong. Moreover, when pre-consolidation pressure is ascertained, the structure must be considered. The research of compression and resilience characteristics of loess lays a foundation for proposing a new method of ascertaining pre-consolidation pressure.
Research on the Law of Stress and Strain Response of Surrounding Rock of Underground Powerhouse Cavity Excavated by Layered Cutting
Authors: Lin Xue , Gao Yang , Jiang Yanbo , Shi Zhenyue , Zhao Xinyue , Wu Kun , Zhang Jie , Yuan Cheng , Ge Xuze , Wang Qingbiao 
Published: September 2020

Abstract
As an important part of the construction of hydropower stations, underground powerhouses are increasingly perfected and synchronized with their construction methods. Layered cutting and excavation methods have emerged at the historic moment. This article takes Wendeng Pumped Storage Power Station as an example, using theoretical analysis, numerical simulation and other methods to study the influence of the layered cutting method on the change of stress and strain of surrounding rock, and draws the following conclusions: (1) The cave is from the first floor to the first during the eight-layer excavation, the tensile stress of the side walls on both sides is symmetrically distributed and there is a maximum on the same layer, and the compressive stress reaches the maximum at the bottom plate; with the increase in the number of excavation layers, the tensile stress on the side walls on both sides increases first and then decrease, the surrounding rock compression stress of the vault and floor continue to decrease. (2) During the excavation of the cavern, the strain of the vault on the same floor reaches the maximum value, and the strain continues to increase with the increase of the number of excavation layers. The excavation of the eighth floor has increased to 4.94mm; The strain changes less with the increase of the number of excavation layers, and is always maintained at 2.50~2.75mm; the floor strain decreases layer by layer. (3) By comparing the on-site monitoring and numerical calculation data, analyze the changing trend of the on-site measured arch strain and the side wall stress around 2.50mm up and down, and calculate the difference ratio between the numerical simulation and the measured data. The excavation time difference ratio reaches the maximum value of 29.1%, which verifies the correctness of the simulation experiment and provides a supporting scheme for the underground powerhouse in harmony with the deformation law.
Research on Application Model of Marine Geological Sampling Model Based on Object-Oriented Relational Mapping
Authors: Chen Chen , Sun Yuxi , Tan Jun 
Published: September 2020

Abstract
In the study of marine geology, the sampling technology and preservation are very important links. Marine geology is developed on the basis of marine sediment sampling technology. ORM (Object-Relation Mapping) technology is an effective method to solve the “impedance mismatch” between object model and relation model. The research on object-relation mapping technology has become a research hotspot in the field of software architecture. The development of object-relational database has enhanced the ability of database to support complex data types, making the integrated storage of spatial data, topological relations and attribute data a reality. This paper proposes a class hierarchy based on the technical framework of object-relational mapping, and explains all kinds of classes. The application of this framework can simplify the mapping mechanism on the premise of meeting the requirements of marine geological sampling, thus providing users with an object-oriented way to intuitively access the database.
Interaction and Research of Biological Organic Fertilizer on Agricultural Soil Geological Improvement Preparation
Authors: Yu Wujiang , Lou Jinyong , Song Chunyan 
Published: September 2020

AbstractBased on the characteristics of bio-organic fertilizer material composition, the paper carried out an experimental study on the improvement of poor soil geology. Through the study of the geological background, stratigraphic characteristics and Quaternary characteristics of poor soil, and through petrification analysis, it was found that quartz in soil geology accounts for a large proportion, high silicate content, severe weathering, and insufficient fertility. At the same time, this article discusses the mechanism of bio-organic fertilizer to improve soil geology, and clarifies that the addition of sludge increases the content of soil geological organic matter, which is beneficial to increase the soil geological aggregate structure and humic acid content, and promote the optimization of geological ecosystem.
Effects of Soil Remediation Agents and Microbial Agents on Soil Enzyme Activities
Authors: Han Lin , Zhai Yuying 
Published: September 2020

Abstract
Soil remediation agents and microbial agents can improve crop yield and improve crop quality, and amaranth is rich in a variety of nutrients, many of the body needs vitamins, proteins and various minerals. Therefore, soil remediation agent and microbial agent were used to treat amaranth. The results are as follows: In the cultivation process of amaranth, if the soil remediation agent is applied, the applied concentration should be 2 g·L−1; If the application of microbial agent, the application of concentration should be 1 g·L−1.
Application of Carbon Isotopes in Loess-paleosol Sequences in Paleoenvironmental Research
Authors: Hu Yi 
Published: September 2020

Abstract
Loess-paleosol sequences at the Chinese Loess Plateau have been proved the best-preserved carriers of paleoenvironmental information. Studies on carbon isotopes in loess-paleosol sequences could obtain useful information for paleobotany and paleoclimatology and reconstruction of paleoenvironment. This literature review points out some imperfections of previous studies and suggests that future studies regarding relationship between carbon isotopes and other climate factors, carbon isotopic fractionation during transformation of plant materials to soil organic matter under different ecological conditions, and carbon isotopes in modern soils of Chinese Loess Plateau should be given priority.
Design of Underground Displacement Measurement System Based on Mutual Inductance and Hall Effect
Authors: Wang Feng , Shentu Nanying , Li Qing , Wang Sheng 
Published: September 2020

Abstract
Deep displacement monitoring of rock and soil is important for landslide warning. By using mutual inductance effect and Hall Effect, the author designed the underground displacement sensing unit through the solenoid and permanent magnet and the Hall sensor. The author designed the Hall voltage measurement circuit and installation device, and used the mutual inductance voltage measurement circuit that the laboratory has realized, which can accurately collect the mutual inductance voltage and the Hall voltage in real time. Through the 485 communication, the collected data is transmitted to the upper computer, the mathematical model established by the curve fitting method can be used to measure the real-time displacement of the deep part of the rock and soil. The experimental result shows that the horizontal displacement measurement range is 0-40mm, and the measurement accuracy can reach 1.5mm. It can measure the underground displacement within a reasonable error range.
Method Verification of Soil Volatile Organic Compounds
Authors: Chen Tianqing , Wang Zhao 
Published: September 2020

Abstract
In this paper, purge-and-trap / gas chromatography-mass spectrometry is used to verify the analysis of six volatile organic compounds in soil, including 1,1-dichloropropene, benzene, and 1,2-dichloroethane. The feasibility of purge and trap / gas chromatography-mass spectrometry for the determination of VOCs in land Engineering was discussed. The results show that in the linear relationship, the response value and concentration of the volatile organic target object show a good linear relationship with a correlation coefficient of 0.9951 to 0.9996; the detection limit is 0.8 to 1.9 μg/kg and the quantification limit is 3.0 to 7.6 μg/kg. The relative standard deviation of 6 volatile organic compounds in precision is: 3.0% to 12.3%; the recovery rate of 6 volatile organic compounds in accuracy is: 112.4% to 127.0%. The verification results show that the linear relationship, detection limit, precision, and accuracy all meet the requirements of “Soil and Sediment-Determination of Volatile Organic Compounds Purge and Trap Gas Chromatography/Mass Spectrometry Method” (HJ605-2011). The purge-and-trap/gas chromatography-mass spectrometry technology can be used to achieve fast, accurate and sensitive detection of target substances, and can meet the detection requirements of trace volatile organic compounds, so it can be applied to environmental testing work such as soil.
Risk assessment model of underground engineering based on Delphi-AHP
Authors: Lei Xu 
Published: September 2020

Abstract
Underground engineering is an extremely complex system engineering, with many uncertain factors and extremely many and complex risk factors. In order to ensure the smooth completion of the organization and construction of the whole underground engineering, risk management is bound to be carried out, and in the process of risk management, risk analysis and assessment undoubtedly plays a crucial role. This paper on the study of underground engineering construction risk scholars both at home and abroad are reviewed, and then briefly summarizes of underground engineering risk analysis evaluation model at home and abroad, sum up experience, to establish universal underground engineering construction risk to risk factors to choose his own table, proposed a based on Delphi-AHP fast universal model of quantitative analysis for underground engineering construction risk to provide the basis for decision-makers quickly.
Analysis and Application of Isolation Layer of a School in Highly Fortified Area
Authors: Li Peng , Meng Zhaohu , Li Juhui , He Lu , Li Jianning , Li Yan , Wang Zhigang , Zhang Qinxiong , Han Guangzhao , Liu Tao , Yang Rong 
Published: September 2020

Abstract
A school complex building is located in an area with a seismic fortification of 8 degrees, with six floors above the ground and two floors below the ground, and has a frame structure. Using YJK calculation program and elastic time history analysis method, the calculation model is established. Through the comparison and verification of the isolated model with the isolated unit and the non-isolated model, the isolation scheme is determined, and the isolation scheme is determined through analysis and research. The isolation layer is arranged on the top of the basement column, and an isolation support is arranged on the bottom surface of each column of the isolation layer to separate the upper structure from the top of the basement column or the top of the beam so as to isolate the seismic energy and reduce the seismic action of the upper structure.
Field direct shear tests on a backfill soil slope and finite element analysis of its reinforcement schemes
Authors: Zhang Zhichao , Ye Longzhen , Chen Zhichao , Xu Shangrui 
Published: September 2020

Abstract
The field direct shear test was used to analyze the backfill soil strength of a filling slope, and the slope controlled by different reinforcement conditions was simulated by finite element method base on the shear strength by the field test. The results show that the shear strength parameters of the backfill soil are friction angle φ = 15° and cohesion c = 25 kPa. Reinforced by anti-slide pile with different lengths, the maximum horizontal displacement of the slope can be reduced by 79.7% ~ 81.3% compared with that of the unreinforced slope. The maximum shear strain of the soil is also reduced to some extent, and the sliding surface characteristics and the strain amplitude are weakened.
Field Test and Numerical Analysis of Flexible Retaining Wall of Shoulder Geocell
Authors: Pang Zhe 
Published: September 2020

Abstract
In order to study the stress and deformation characteristics of the shoulder type geocell flexible retaining wall, a three-dimensional numerical model of the geocell flexible retaining wall is established based on the reconstruction project of Zichang County urban transit section of Provincial Road 205 in Shaanxi Province, and the numerical calculation results are compared with the field monitoring results. The results show that the base pressure of the flexible retaining wall of the shoulder geocell increases with the increase of the filling height of the retaining wall, and decreases slightly after the completion of the construction; the horizontal earth pressure on each layer of the retaining wall is not evenly distributed, the horizontal earth pressure in the middle of the retaining wall > the horizontal earth pressure inside the retaining wall > the horizontal earth pressure outside the retaining wall; the horizontal earth pressure and the horizontal deformation after the stability are along the height of the retaining wall The drum distribution is the largest at the height H / 2 of the retaining wall.
Research on a Non-destructive Testing Technology for the Foundation of Transmission Tower Based on Rayleigh Wave Method
Authors: Wang Longlin , Wang Hua , Wu Changxia , Peng Xi 
Published: September 2020

Abstract
There are more and more accidents of transmission tower collapse caused by the defects of foundation. The safety of the foundation of transmission tower has gradually attracted the attention of relevant departments. However, for the existing concrete foundations of transmission towers, the conventional detection methods will not only cause structural secondary damage, but also have extremely low efficiency, which is not conducive to actual large-scale detection. Therefore, this paper aims to propose a non-destructive testing technology for the foundation of transmission tower based on Rayleigh wave method. The non-destructive testing theory for the foundation of transmission tower based on Rayleigh wave method was firstly introduced. And then the non-destructive testing procedure of the foundation size of transmission tower based on Rayleigh wave method was described in details. The proposed non-destructive testing technology for the foundation of transmission tower based on Rayleigh wave method was verified through an actual foundation model of transmission tower. The experimental results prove that the proposed method in this paper is feasible.
Research on structure and performance of polyurethane elastomer/superfine talcum powder composite
Authors: Ma Qixiang , Zhu Jingrong 
Published: September 2020

Abstract
The structure and performance of polyurethane elastomer/superfine talcum powder composites were investigated by X ray diffraction ( XRD), FTIR spectra and thermogravimetric analysis ( TG - DTA, DSC ). The results showed that talcum powder and polyurethane elastomer formed com pound structure of heterogeneous nucleation when the content of superfine talcum powder was right(such as 15% ), which caused the soft segments, hard segments and talcum powder of polyurethane elastomer to form interactional congeries system and the integrated mechanical properties and thermostability of polyurethane elastomer were improved.
Experimental Study on Humidity Structure and p-value of Undisturbed Loess in High-risk Slope
Authors: Jia Yajun , Tang Zhihong , Chen Cunli , Liu Naijun 
Published: September 2020

Abstract
A long-term dry-wet cycle will cause changes in the internal structure of the loess, which will affect its permeability coefficient and slope properties. In this paper, through the dry-wet cycle test, the changes of permeability coefficient P value, porosity and dry density of undisturbed loess and remodelled loess under the action of dry-wet cycle are studied. Under the condition of dry-wet cycle, the permeability coefficient of undisturbed loess in high-risk slope decreases, and the permeability coefficient of remoulded loess increases. Remoulding the original loess of high-risk slopes due to soil erosion is more likely to cause gullies and internal erosion, accelerating the occurrence of original loess landslides and collapse of high-risk slopes.
The risk assessment of tunnel surrounding rock deformation based on entropy weight method and extension matter element method
Authors: Hou Shoujiang 
Published: September 2020

Abstract
The deformation of surrounding rock is an expected geological hazard when the tunnel passes through the area with unfavorable geological conditions. If the surrounding rock deformation is too large, it will lead to serious safety hazards. In this paper, the entropy weight method is adopted to calculate the weight of each index. Based on the extension theory, the risk evaluation model of tunnel surrounding rock deformation is established. Five evaluation indexes, such as surrounding rock grade, tunnel depth, groundwater status, the uniaxial compressive strength of rock, and rock integrity, were selected to evaluate the deformation risk of surrounding rock in 10 sections of Sheta Village tunnel of Zhangjihuai high-speed railway. The results show that the surrounding rock deformation is high in 2 of the 10 cavities to be evaluated, and the workers must take reinforcement measures to strengthen the surrounding rock, which is of considerable significance to guide the scientific and reasonable construction of the tunnel.
Technical Specifications for Natural Grassland Improvement of Karst Area in Guizhou
Authors: Yang Xuedong , Li Li , Ding Leilei , Liu Jiajia , Liang Xianyi , Liu Jiming , Wang Puchang 
Published: September 2020

Abstract
In order to strengthen the protection of ecological environment in Guizhou, speed up the development of ecological animal husbandry, and improve the standardized production level of natural grassland in Guizhou, based on the summary of practical production and scientific research achievements, this paper stipulates the methods and measures of natural grassland improvement in Guizhou karst mountainous areas, as well as their application scope and operation steps. Specific requirements are put forward for forage sowing, field management and utilization of improved grassland in the process of natural grassland improvement. The formulation of this technical regulation has practical significance for scientifically guiding the standardization, standardized development and utilization of natural grassland in Guizhou karst mountainous areas.
Near-field directional seismic waves based on tunnel environment
Authors: Yue Yongao , Ren Dongxu , Chen Yongqian , Li Zhengfeng , Zhou Gaofeng , Cui Lujun , Han Chun 
Published: September 2020

Abstract
In this paper, a near-field directional seismic wave (NFDSW) method based on near-field application environment is proposed. Different from the far-field directional seismic wave technique, the time-delay parameter of near-field directional seismic wave is not a single fixed value, but a variation value. In this paper, the accurate delay parameters of target signal are estimated by cross-correlation method, then the phase axis of target signal is leveled by delay parameters, and finally the final target signal is obtained by array element superposition and inverse correction. Numerical simulation shows that the near field directional seismic wave technology can separate the target signal well and improve the quality of target signals significantly in the near field environment.
Stability analysis of the middle wall in process of double-arch tunnel construction
Authors: Gao Haidong , Li Gang , Guo Yanbing , Gao Peng 
Published: September 2020

Abstract
As the main bearing components of double-arch tunnels, the stability of the middle wall is related to the construction safety of double-arch tunnels during construction and operation. Different construction methods of double-arch tunnel have great influence on the stability of middle wall, especially when the excavation span is large and the buried depth is very shallow. Based on an ultra-shallowly buried double-arch tunnel with extra-large spans in Xiamen, China, the mechanical response and deformation law of the middle wall are obtained. Furthermore, the performance of the CRD method and the double-side-drift method for optimizing the deformation and stress state of the middle wall are compared. The results can serve as initial guidelines for the for the selection of double-arch tunnel construction schemes.
Application of BIM in Pipeline and Equipment Project of an Energy Centre
Authors: Zhao Yu , Zhao Na , Ma Jian , Ma Fan 
Published: September 2020

AbstractThis paper is based on BIM chemical plant upgrade project energy centre plant design, BIM Technology is applied to the project pipeline comprehensive design, using the Revit to complete the professional system modelling, using Naviswork to analyse the collision conflict between various disciplines and generate collision conflict report, through the pipeline comprehensive adjustment optimization model, improve the design quality.
Titanium-doped MoS2 monolayer as highly efficient catalyst for hydrogen evolution reaction
Authors: Shi Wenwu , Wang Zhiguo 
Published: September 2020

Abstract
The effects of Ti dopants on the catalytic activities of the hydrogen evolution reaction (HER) in monolayer MoS2 basal plane were investigated using density functional theory. Our study shows that Ti dopants that substituted Mo atoms in MoS2 have small formation energy, and the complex dopant structures involving multiple Ti sites are energetically more stable than the isolated ones. Doping Ti atoms greatly improves the catalytic performances of MoS2 with a near-ideal hydrogen-adsorption Gibbs free energy. Projected density of states analysis revealed that the mechanism for the improvement of catalytic activity is due to formation of the density of states near the Fermi energy level upon increasing dopant concentrations. It can be expected from the current results that excellent catalytic performance can be obtained by atomic composition modifications, such as Ti doping in the HER reaction.
Application of collaborative modelling method in Pile-Beam-Arc of Subway station
Authors: Luo Qingfei , Cao Quan , Li Wei , Zhao Chunsheng , Xue Qingwei , Zhang Mengheng , Shen Peng 
Published: September 2020

Abstract
Taking Pile-Beam-Arc of Harbin Metro Line 2 Shengzhengfu station as an example, through the Midas GTS NX, different methods are used to establish the numerical model of PBA method. The results show that the quality of the model generated by the collaborative modelling method is better and the modelling efficiency is higher. The specific embodiment is that the number of units generated by the collaborative modelling method is less than that of auto-solid method, and the operation time of the model is reduced. The quality of the model generated by the collaborative modelling method is better than that of auto-solid method, which improves the model convergence and accuracy. The efficiency and application conditions of collaborative modelling method are better than those of plane element expansion method.