bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modeling and Analysis of CTCS-1 On-board Subsystem Based on Simulink/Stateflow
Authors: He Yangyang , Liu Zhongtian 
Published: April 2020

Abstract
According to the structure of the CTCS-1 train control system and the complexity of its on-board subsystem functions, a model-based method was used to implement the modeling and simulation of the on-board subsystem that using the combination of Simulink and Stateflow in MATLAB software. Then this paper analyses the emergency braking distance and the actual running curve of the train when the following trains at different speeds exceed the emergency braking trigger speed. The results show that the braking distance generated by the established emergency braking trigger model meets the requirements given by train manufacturers, and has a certain safety margin, which also verifies the correctness of the model. The modeling method is intuitive, efficient, visual, and easy understand that the model can well describe the characteristics of the system. The simulation results can provide certain support for the design, research and implementation of the on-board control subsystem of the CTCS-1 train control system.
BDS triple-frequency carrier phase combination smoothing pseudo-range algorithm
Authors: Meng Fanjun , Li Shujun 
Published: April 2020

Abstract
The carrier phase smoothing pseudo-range algorithm can effectively reduce the influence of multi-path effect and observation noise on pseudo-range positioning and improve the accuracy of pseudo-range positioning. Aiming at the problem that the existing classic Hatch filter smoother is susceptible to the cumulative interference of ionospheric delay in the pseudo-range smoothing process, the ionospheric delay and observed noise of the original double-difference observation are further weakened by constructing the optimal Beidou triple-frequency linear combination. The triple-frequency double-difference carrier phase combination are used to smooth the pseudo-range combination to replace the original observations. Finally, four groups of Beidou triple-frequency measured data with different baseline lengths, including 4m, 14.4km, 61.7km and 131.6km, are used to verify the algorithm. The theoretical derivation and effectiveness of the algorithm are verified by comparing and analyzing the smoothing effect of the algorithm in the following four groups of baseline conditions.
Ways to Correct the Errors in Posture of Multi-beam Sounding Resulted from Water Flow
Authors: Wang Xin , Feng Chengkai , Yu Jiayong , Tian Maoyi , Fu Pingwei 
Published: April 2020

Abstract
Multi-beam bracket deformation is caused by factor like water flow and speed of ship. Such deformation also leads to the axle offset of relative attitude indicator of transducer, which may influence the accuracy of results. As for this phenomenon, the paper proposes a method that calculates water velocity and output speed of ship according to the navigation data, in order to fit the attitude deviation and correct the results of depth measurement. First of all, water velocity and output speed of ship of two adjacent stripes without abnormal sounding results in the testing zone in good sea condition are calculated respectively according to navigation data, and then the errors in posture of these two stripes in different time are worked out respectively based on discrepancy in elevation of the overlapping portions of the stripes; secondly, a modifier formula of water velocity, output speed of ship and errors in posture is formulated; finally, this formula is applied to solving errors in posture and correcting the sounding data of stripes in the testing zone. According to the experimental results, the proposed method can eliminate errors in posture effectively, with the average of discrepancy in elevation reduced from 0.188m (before) to 0.032m (after). The stripe splicing effect is improved and the data accuracy is enhanced enormously.
Application Research of Earth Volume Calculation Based on 3D Laser Point Cloud Data
Authors: Wang Yan , Fan Zixian , You Yingchun 
Published: April 2020

Abstract
the accurate calculation of earth volume is a very important work in engineering construction. The traditional calculation of earth volume requires the use of RTK measurement to collect a large number of data, which makes the workload outside the page very large and seriously affects the efficiency. 3D laser scanning technology is now widely used in many areas. This paper uses a 3D laser scanner to collect data from a school experimental site and calculate the earth volume. Then compare with traditional RTK measurement methods. The results show that the three-dimensional laser scanning technology has a fast speed, high precision and good results. This technical method has achieved good results and is worth promoting.
Characteristics and Prevention Measures of Loess Geological Disasters in Longdong Region
Authors: Yang Yang , Liu Wanfeng , Hu Aiping , Zhang Binwei , Yang Hongping 
Published: April 2020

Abstract
In recent years, loess geological disasters in Longdong region occurred more and more frequently. On the basis of investigation on loess geological disasters in Longdong region and analysis of basic physical characteristics of loess geological disasters, landslide, collapse, debris flow and loess collapsibility are identified as the main geological disasters in Longdong region. The causes of four types of loess geological disasters in Longdong region are studied and corresponding prevention measures are proposed.
Experimental Study On Mechanical Properties Of Polyacrylonitrile-Polypropylene Thick Fiber (PAN-PPTF) Concrete With Different Thickness
Authors: Liang Cao , Yun-fei Zhang , Zhen-shu Li 
Published: April 2020

Abstract
In order to improve mechanical properties of concrete and reduce the use of steel, in this experiment, polyacrylonitrile fiber (PAN) and polypropylene thick fiber (PPTF) were mixed to replace the use of steel fiber, and the thickness of the PAN-PPTF concrete was changed. The results showed that the compressive strength of concrete test blocks decreased with the increase of the thickness of PAN-PPTF concrete, but the split-tensile strength and bending strength of test blocks both increased. When PAN-PPTF concrete was 1/3 of the test block, the compressive strength decreased by 5.62%, but the split-tensile strength increased by 36.08%, and the bending strength increased by 38.48%.
Research on Field vane Shear Strength of Marsh Peat Soil in South America
Authors: Zhang Ruiqi , Chen Yuntao , Zhu Shengli 
Published: April 2020

Abstract
According to high backfilling project in South America, through a large number of laboratory tests data and field vane shear test results, the engineering characteristics of marsh peat soil in this area are analyzed, and the variation of the shear strength of the peat soil along the depth and the sedimentary characteristics are demonstrated. The selection principle of the calculation index of the foundation for the high-filling operation of peat soil foundation is proposed. It has reference significance for similar engineering construction.
Technology for Rapid Consolidation of Shallow Ultra-soft Soil
Authors: Tianyun LIU 
Published: April 2020

Abstract
The shallow ultra-soft soil needs to be consolidated quickly to form the early working layer in more and more land reclamation. Through the innovation and improvement of the conventional vacuum preloading method, the technology for rapid consolidation of the shallow ultra-soft soil is created, which adopts auxiliary measures such as erection of foam floating bridges, construction of water retaining dams, and laying of geotextiles on the mud to realize the manual construction of plastic drain plates, and innovatively applies of the recyclable tri-planer geonet instead of the sand cushion. The technology has been successfully applied to the practical reinforcement engineering of the shallow ultra-soft soil and achieved good effect, which has a good prospect of popularization and application.
Seismic Behavior of a Novel Prefabricated Concrete Sandwich Panel System
Authors: XU Zilong , Xie Qun , YU Xiaowei , Zhang Shoushuo 
Published: April 2020

Abstract
An innovative sandwich wall panels as structural load-bearing elements have been presented. Besides the conventional configuration of sandwich panel, this new panel system has some distinctive characteristics including core column reinforced by spiral stirrup along the panel cross-section with spacing 650mm, foamed concrete as insulation layer, self-compacting concrete used in external layers. Furthermore, to improve the global strength and stiffness of panel, 3D steel wire system which is composed by two vertical steel wire meshes connected by horizontally short steel bar has been uniquely employed in concrete layer. An experimental campaign has been carried out to investigate the seismic behavior of this new panel system. According to the analysis of load-bearing capacity, hysteretic behavior, skeleton curves and stiffness degradation, conclusions could be drawn that the new prefabricated concrete sandwich wall system has comparable performance with traditional concrete solid wall.
Study on deformation characteristics of permafrost roadbed considering the influence of temperature field
Authors: Li Bin , Liu Zhao 
Published: April 2020

Abstract
Taking ha-da railway passenger line as the research object, the temperature field of the subgrade in frozen soil area is simulated by numerical calculation method, and the influencing factors and distribution of the temperature field of the permafrost subgrade are analysed. Finally, the following results are obtained: with the increase of climate warming temperature, the temperature field in the roadbed changes slowly, and the temperature at different depths increases. When the maximum freezing depth appeared after 20 years, the roadbed was in full positive temperature due to the influence of climate warming. The settlement of roadbed after construction under the action of temperature field and force field does not exceed 15mm, which meets the requirements of the code.
Finite element analysis of rutting on full depth asphalt pavement in port area considering temperature field
Authors: Chunhua Hu , Yuhao Chen 
Published: April 2020

Abstract
To investigate the rutting of the full depth asphalt pavement in the port area, finite element software is used to establish a temperature field model. The vertical deformation of the pavement structure is calculated under five axial load level. Numerical analysis results show that for the proposed pavement structure, vertical deformation is more obvious on the upper layer of the pavement. And it is mainly reflected in the positive deformation of the center of the wheel gap and the negative deformation of the tire centre. In the pavement structure, the middle layer contributes the most to rutting, and the methods for reducing rutting can be explored for this layer of material. The magnitude of the axle load has a great influence on the rut, and the road at the P
1 level in the port area is more suitable for full depth asphalt pavement. During the period of 220,000 to 400,000 axle loads, the increase in rut deformation is the largest, and the prevention of rut problems on the road can be carried out at this stage.
Research and analysis on residual shear strength of surrounding rock base on elastic-plastic softening model
Authors: Zhou Heng , Zhang Ying , Liu Bo , Di Shengjie , Huang Peng 
Published: April 2020

Abstract
The excavation of caverns caused the unloading of the surrounding rock, which decrease the strength of the rock mass. In this paper, an ideal elastic-plastic stress-strain softening model is used to analyse the shear strength sensitivity of the surrounding rock during cavern excavation, in order to research the relationship between deformation, stress, plastic zone and the strength parameters. The results show that the values of each shear strength parameter have a significant effect on the distance of the plastic zone, and the sensitivity of the plastic zone distance shows that the influence of peak internal friction angle, residual internal friction angle, residual cohesion and peak cohesion decreased successively.
Study on physical and mechanical properties of flowing mud in the Shenzhen area
Authors: Ai-rong ZHENG 
Published: April 2020

Abstract
Flowing mud is a kind of special soil with fluidity under gravity. It is found that the flowing mud has ultra-high water content, high limit moisture content, and its strength is very low due to the large amount of free water. Therefore, the shear strength evaluation is not appropriate. With the increase of preloading load, the shear strength increases continuously. However, the coefficient of consolidation is small and the consolidation time is long.
The influence of excavation of the dredged foundation of transmission towers on the stability of Yanzi landslide
Authors: Yingbo Zhou , Hang Chen , Qiupeng Zhou , Zhiqiang Duan , Xiaojing Gao , Lisong Gao , Yongqiang Zhou 
Published: April 2020

Abstract
With the construction of the national network project, transmission towers are inevitably erected on the landslide body. Excavation of transmission tower foundation often causes disturbance to the soil of the slope and reduces the stability of the slope. At the same time, the unfavorable stacking of construction spoil is also an unfavorable load to the slope. Under the combination of various unfavorable factors, slope instability accidents are prone to occur, causing losses to the grid operation. In order to reduce the amount of excavation and to minimize the impact of foundation excavation on the landslide, generally, dredged foundation is the selected excavation method of the transmission tower foundation. Therefore, this article takes the Yanzi landslide and 500kV transmission tower as the research object. Firstly, the mechanical parameters of the soil of the Yanzi landslide were analyzed, and then the influence of the excavation of dredged foundation and the spoil pile loading on the stability of the landslide was studied by 2D finite element method. Finally, 3D finite element method was used for verification and supplementation. The results show that the foundation excavation of transmission tower has negligible effect on total landslide stability, but local potential landslides need to be considered.
3D printable ‘just-add-water glass and water’ geopolymer-an experimental research based on extrusion-based 3D printing practices
Authors: Yin Xiaohong , Liu Kaiyuan , Zheng Shuyi , Zhuang Kunde , Wang Xiaodong , Fang Yuan , Ding Zhu 
Published: April 2020

Abstract
The application of 3D printing technique has been bringing construction to a new stage. Development of suitable materials and suitable printing process of printable mixtures are very important issues. The present study aims to understand the strategies for the application of ‘just-add-water glass and water’ geopolymer in extrusion-based 3D printing. The 3D printing practice showed that the satisfactory printing quality, including extrudability, shape retainability, and buildability, can be achieved by adjusting water-to-binder ratio and gap time between layers for the ‘just-add-water glass and water’ geopolymer in fly ash – slag binary system.
Validation of MODIS C6 Aerosol Optical Depth in China
Authors: Zhang Tianqi , Cao Hongye , Song Huaiqing , Shi Haixia 
Published: April 2020

Abstract
The accuracy of MODIS Collection 6 (C6) aerosol optical depth (AOD) products in China is validated by using AERONET (Aerosol Robotic Network) ground observation data. The scatter plots and linear fitting results of each ground site are obtained, and the research area is divided into five parts. Analyzed the retrieval effects of MODIS C6 AOD products in different areas. The results show that: (1) In North China and Southeastern coastal, the difference between MODIS and AERONET AOD is small, and the retrieval accuracy is good. (2) The Northwest and Central and Eastern are uncertain due to the diversity of topography and landforms. (3) The accuracy of the Qinghai-Tibet Plateau is poor and there is a serious overestimation. Compared with the previous MODIS version of AOD products, the accuracy of C6 products in various regions of China has been significantly improved, which can provide data support for aerosol spatial-temporal distribution and atmospheric particulate matter retrieval research.
Study on spatial variability of soil nutrient and the evaluation of soil quality based on GIS
Authors: Xiao Hai , Tan Chunhong 
Published: April 2020

Abstract
In this study, geostatistics and GIS were applied to analyze the spatial variability of soil nutrient and the soil quality combined with the research variability property and spatial data in research area. The purpose of this paper is to study the spatial variability regulations between soil quality conditions and soil nutrient. The results show that the spatial variability degree of organic matter (OM), total nitrogen (TN), available potassium (AK), available phosphorus (AP), alkaline nitrogen (AN) and pH is 42%, 33%, 31%, 67%, 58% and 13%. pH is weak variability, TN and AK is low variability, all OM, AP and AN are moderate variability. The spatial distribution of soil nutrient is different, but there are some relationships in partial area.
Correlation Analysis between the Control Degree of the Construction Project Department to the Labor Subcontracting Team and the Construction Quality
Authors: Daxiao XU , Dongming XU , Pengfei LI 
Published: April 2020

Abstract
As the labor subcontracting team is the most basic organizational unit on the construction site, which can have an impact on quality, safety, construction period and cost, the management of the labor subcontracting team by the construction project department is a very important part of the project management. The construction quality of construction engineering is also a hot issue studied by many scholars. From the existing research results, we can know that there are many factors that affect the construction quality. This paper sets up the concept of control degree, which indicates the comprehensive management level of the construction project department to the labor subcontracting team, establishes the control degree and construction quality evaluation system, and calculates the weight and comprehensive score of each evaluation index of the control degree and construction quality evaluation system by using entropy weight method. The correlation between control degree and construction quality is analyzed by using SPSS software, which provides reference for construction project management.
Investigation of the Effect of Fissure Angle and Temperature on the Strength and Deformation of Rock-like Material
Authors: Hongwei Wang , Qiang Ge , Lizhuang Cui , Yongyan Wang , Jianguang Li 
Published: April 2020

Abstract
In order to investigate the effect of fissure and temperature on deep-seated rock, uniaxial compression experiments were conducted on rock-like material with different fissure angle at different temperatures. We investigated the influence of fissure angle and temperature on strength and the influence of fissure on failure mode of the rock. Also, we simulated the uniaxial compression experiment of rock-like material with ABAQUS. The results of experiments and simulations confirmed that the strength of rock-like material decreased with increasing temperatures and the strength decreased first then increased with increased fissure angle. The crack initiation started from the tips of the pre-existing fissure and we could speculate via the simulation that the reason of the crack initiation was stress concentration on fissure tips.
Research on optimization design of underground garage comprehensive pipeline based on BIM technology
Authors: Li Pengfei , Yu Yingxia , Xu Daxiao 
Published: April 2020

Abstract
In order to explore the layout of the underground garage comprehensive pipeline and optimize the layout of the underground, this paper takes the complex large underground garage project as the research background, establishes a 3D visual information model by using BIM technology, and proposes the corresponding optimization principle and optimization process to optimize the design of the comprehensive pipeline in the complex area of the underground garage. On the premise of satisfying the use function of the pipeline and the internal height of the underground garage, it also takes into account the beauty and other requirements. The application of the optimized model in this study to guide construction fully meets the acceptance requirements, reflects the superiority of BIM technology, and has good practical guidance significance.
Research on construction technology of frame structure in construction engineering
Authors: Wu Wei 
Published: April 2020

Abstract
With the rapid development of the construction industry, the building technology needs to be improved day by day. The application of reinforced concrete frame structure is suitable for all kinds of projects for its strong seismic capacity, good integrity and durability. This paper introduces the characteristics of the frame structure, discusses the problems existing in the two important works of reinforcement and formwork, and introduces the correct construction technology. Finally, it expounds the construction method of the frame structure of the construction engineering, and the affectivity was demonstrated in concrete frame structure cases.
Design towards the conversion between land sports and ice sports in infield space of arena
Authors: Qiao Lin , Liu Deming 
Published: April 2020

Abstract
In order to speed up the realization of the development goal of “300 million people participate in winter sports“, winter sports facilities have been built all over the country. The construction of arena combined with ice sports is also one of the measures to increase ice sports facilities. The article compares the arena combined with ice sports to the common arena, and analyzes its advantages. In view of the special characteristics of ice and land sports, the article summarizes the main factors that need to be coordinated in design and technical aspects of ice sports arenas from the aspects of site, athlete’s room, equipment room, site structure and thermal environment, and comes up with design strategies.
Key Technologies of Metro Construction in Complex Geological Areas
Authors: Hongbo Li , Gelin Liu 
Published: April 2020

Abstract
In recent years, China's underground rail transit has developed rapidly, especially with the construction of urban subway tunnels, submarine traffic lanes, water conservancy and hydropower, and municipal public tunnels. The construction of underground tunnels by shield method has been widely used. However, in some complex geology, the construction of the shield method still encounters many problems, including ultra-shallow covering and connecting through the group houses. How to solve these practical engineering problems is a topic that people are very concerned about. Based on this, this paper has carried out related research work on three common problems, including the ultra-shallow soil-pressure-balanced shield lake bottom tunnelling technology, the shield tunnelling control technology for the close-crossing group buildings, and the construction technology of complex geological and extra-large subway stations. Through the review of existing cases and theoretical research, it provides references for similar construction problems in the future.