bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis and Safety Assessment of Lining Thickness Defects in Highway Tunnels
Authors: Jiang Xinghong , Li Ke 
Published: March 2020

Abstract
Linings are the main structure of a tunnel to withstand pressure from surrounding rock and their thickness is representative of their load carrying capacity. Tunnel lining thickness defects will have a direct impact on the long-term stability of the tunnel project. Existing research on lining thickness defects focuses on analysis of crown thickness defects using failure load as criteria and is applicable to theoretical research with a lack of guiding significance to actual projects. Based on the test results of lining thickness defects in multiple tunnels of the Liangping-Zhongxian Expressway in Chongqing, this paper covers analyses of thickness defect location and extent and numerical analysis of the effects of different thickness defects on structural performance. The analysis results show: under the same surrounding rock conditions the probability of tunnel lining thickness defects occurring at the hance is similar to at the crown; the probability of thickness defects increases as surrounding rock conditions worsen; when thickness defects exceed 10%, the thickness defect percentage is inversely proportional to the safety factor. The research findings are of practical significance and can provide guidance to NDT, defect treatment and safety assessment.
Scale Model Study on Water Seepage from Cracked Lining Structure
Authors: Ding Hao , Jiang Xinghong , Li Ke 
Published: March 2020

Abstract
The calculation of water pressure behind a cracked lining structure requires determination of the crack width, amount of water seepage and the value of water pressure. Regarding the relationship among lining structure crack, water seepage and water pressure, self-made concrete splitting specimens and Chongqing University developed cavitation acoustic shock test system are used to study water seepage in the specimens. The test results show: water pressure and crack width are main factors influencing water seepage; at a given crack width, excessive water pressure imposes local load on the lining structure, aggravating its cracking; when the crack is excessively wide, water pressure changes slightly but flow rate increases considerably affecting traffic in the tunnel. Meanwhile, increased pressure from surrounding rock compresses the crack in the lining structure and reduces flow rate. The study results can provide reference to treatment of defects in tunnels at different depths in different areas.
Safety Analysis for Construction of Building Structures in Close Proximity to Existing Tunnel
Authors: Shengzhong Wu , Xinghong Jiang 
Published: March 2020

Abstract
As a core component of urban public transport, rail transit must meet very strict requirements for operational safety. Constructing houses over an operating subway tunnel will result in changes in structural load. Improper design and construction would have bad social implications from structure cracking to tunnel collapse. In the context of Cangbai Road Community Building Project in Chongqing, analyses are performed of the performance of existing Line 6 section tunnel and Yuzhong connecting tunnel under axial force and bending moment and deformations of surrounding ground and structure during the project construction to assess the safety implications of the building structure on the existing tunnel structure underneath. The results show: the rail tunnel experiences a maximum horizontal displacement of 0.93mm and vertical displacement of 3.87mm during construction of the community building; after the community building is completed, the verified sectional factor of safety is 2.9 and maximum crack width is 0.18 for Yuzhong connecting tunnel and the sectional factor of safety is 3.0 and maximum crack width 0.11 for the rail tunnel, meeting specified control requirements. Through strict construction control and intelligent monitoring measurement, main structure of the project has been completed without inducing any rail safety accident. The successful development of this project provides helpful experience to similar projects and more reference for multi-purpose development of urban land.
Research on Influence of Pile-arch Conversion Structure on Existing Tunnel
Authors: Deng Zhiheng , Gao Xiliang , Yang Menggen , Yan Feiyue , Qi Xingxin , Qiu Wenge 
Published: March 2020

Abstract
Based on the actual project of Chongqing North Station project, this paper uses the software Flac3D to construct the excavation conditions of the foundation pit near the tunnel. A pile-arch conversion structure was applied above the tunnel. By examining the stress and axial force of the tunnel and calculating its safety factor, the advantages of the arch structure over the flat beam were explained, providing guidance and reference for similar projects in the future.
Seismic Response and Damage Mechanism of the Subway Station in Rock and Soil Strata
Authors: Chen Juntao , Hao Kun , Chen Jiabao , Ma Jianyun 
Published: March 2020

Abstract
Numerical simulations are carried out to study the seismic response of a subway station in rock and soil strata. In addition, during the numerical simulation, Drucker-Prager yield criterion and the constitutive model for concrete are introduced to be able to adequately describe the yield failure of surrounding rock and damage behavior of concrete. Based on the numerical results, the time histories of principal stresses, distribution of principal stresses at particular moments, the plastic deformation of surrounding ground and the damage of structure are fully studied. According to results and discussion, it can be concluded that the largest tensile stress generally occurs at corners including the spandrel, top of sidewall and the bottom of the sidewall. In addition, large shearing deformation is observed at the interface of rock and soil layer, due to the incongruous deformation. Structure damage is mainly observed at corner area in symmetrical distribution.
Analysis of the influence of super high-rise building construction on large-span tunnels adjacent to overlapping tunnels
Authors: Yu Shun , Xiao Bo , Zheng Xixi 
Published: March 2020

Abstract
A building site consists of a garage and two super-high-rise towers. Two-way six-lane municipal double-arch tunnel and single-tunnel double-line long-span metro tunnel overlap above and below the building site. Finite element software is used to simulate the influence of surface construction on the two tunnels. The calculation results show that the construction above the tunnel has little influence on the structural deformation of the two tunnels, and the structural displacement of the metro tunnel meets the requirements of the safety control index of the rail transit structure; because the metro tunnel bears large rock, soil and building loads above, the structural design of the metro tunnel should be strengthened to meet the bearing capacity requirements.
Study on Prediction of Burst Hazard Associated with Advancing a Tunnel through Goaf
Authors: Cheng Liang , Ding Hao , Jiang Xinghong 
Published: March 2020

Abstract
To prevent gas burst disasters while advancing a tunnel through the goaf, the technology for predicting burst hazard associated with advancing a tunnel through the goaf is presented in this paper. First, the safety control distance of prediction holes in each zone before the tunnel is advanced through the goaf is established via numerical simulation to further determine the number and arrangement of prediction holes. Then, burst prediction indicators are determined and prediction results are obtained through analysis. Prediction of burst hazard associated with advancing the left tube of Huayan Tunnel of Chengdu-Chongqing Motorway through the goaf of coal seam K1 of South Zhongliangshan Mine at ZK3+130 was performed and it was found that none of the prediction indicators exceeded critical values, thus concluding there was no burst hazard. With more pre-support measures put in place, the proposed technology ensured the safety in advancing the tunnel through the goaf of coal seam K1.
Development and Application of Tunnel Apparent Distress Monitoring System Based on Video Image Analysis
Authors: Ang Hongsheng , Ma Fei , Su Junwei , Guo Hongyan , Li Ke 
Published: March 2020

Abstract
With a lack of complete system and hardware equipment for long-term monitoring of distresses in an operating tunnel to address theoretical and technical issues, it is necessary to develop an IoT-based integrated system for long-term monitoring of lining crack, water leakage and spalling in an operating tunnel using video image processing technology and technique in conjunction with computer programming languages. Use of video image processing methods of this monitoring system allows rapid, accurate identification of distresses and the extent thereof. It is concluded that linear array CCD is the best option for engineering surveillance cameras since such CCD is able to accurately capture both static and dynamic targets; the use of higher-definition cameras provides for tiny target identification under remote monitoring conditions and the addition of temporary storage module for field data.
AHP and Casualties Calculation Based Research on Road Tunnel Fire Risk Evaluation
Authors: Xia Yangyuyu , Wang Bufan , Ma Fei 
Published: March 2020

Abstract
On the basis of classic risk theories this paper proposes a more pertinent and practical fire evaluation model for road tunnels. According to causes for tunnel fire, an index system for assessment of tunnel fire probability and rating criteria are established based on tunnel properties, environmental conditions, traffic status and vehicle performance. By fine modelling of tunnel fire smoke spread and personnel escape behaviour, a calculation method and rating criteria for consequences of tunnel fire are established. The research results suggest this method is a feasible means to assess road tunnel fire risks.
Analysis of controlled blasting for Large-span Tunnel Passing beneath Cultural Relics Building
Authors: Xiong Jun , Si Junling , Zheng Yuchao 
Published: March 2020

Abstract
The section of No.3 Tunnel of Nanya Road passing beneath the botanical garden is very close to the cultural relic buildings and other buildings in the garden. Based on the project, the influence of blasting vibration on the cultural relic buildings is studied, and the blasting control measures are put forward through the FLAC3D finite difference software. The results show that the corresponding blasting parameters are designed reasonably, which have a good effect on the blasting control.
Study on the optimization of the approaching construction of the four-hole large-section municipal tunnels crossing railway tunnel
Authors: Gong Lun , Yu Jingwen , Sun Xuefei , Zhang Zhixin , Wu Jinlin 
Published: March 2020

Abstract
In order to analyse the safety of the two main line tunnels and two ramp tunnels crossing the existing Bajiaogou tunnel in Chongqing University City, the plane and three-dimensional models were established to study the impact on the existing railway tunnels by strength reduction method and structure analysis method. Research results: the influence of different excavation bench lengths (6m and 12m) on the existing tunnel is analysed, and suitable excavation bench length is 6m. According to the deformation rule of the lining rigid body structure, the displacement control value of the C35 lining structure is 5.9mm. Various excavation procedures have different effects on the structure and the overall stability of the surrounding rock, so optimizing the excavation process can reduce the impact of construction. Optimization principles are derived from the structural displacement time history curve of the optimal conditions. The principles: interval excavation of approaching large-section tunnels, avoiding multiple disturbances in a short time, excavating the distant tunnel before the vicinity and excavating the upper tunnel before the below. The conclusions have guiding significance for the optimization of the four large-section tunnels’ approaching construction.
Design Method of English Corner Based on Virtual Community Technology
Authors: Zhang Jingzhi 
Published: March 2020

Abstract
The English Corner has always been an important foundation for college English learning. However, with the development of social development and the updating of modern methods, many college students have more and more forms of communication, and this form of face-to-face English communication has been increasingly ignored. As an important foundation for developing students’ independent learning and innovative skills, the university is the second English part of English acquisition and an important training place in addition to regular courses. Student learning breaks the rich teaching model of traditional teachers, but not many students practice English. The purpose of this article is to study the English corner through virtual community technology. In this paper, the fuzzy weighted evaluation method is used to obtain the weight allocation results of the virtual learning community knowledge sharing evaluation index system, and this is used as a quantitative basis for the fuzzy comprehensive evaluation method to evaluate the actual virtual learning community. And through the design and development of corresponding questionnaires, the virtual community and the application of the case “virtual English corner” related questionnaire surveys to obtain data, fuzzy comprehensive evaluation method to process the data. Finally, it is concluded that in the evaluation of the effectiveness of learning using the “virtual English corner”, the analysis finds that the ineffective is zero, 26.6% think it is very effective, and 93.7% think it is above intermediate level (3 points and above). It can be seen that the community members surveyed are quite satisfied with the effectiveness of the “Virtual English Corner” learning. We believe that the “Virtual English Corner” provides an online platform for effective learning.
Application Research of Project-based Teaching Based on Working Process in Oracle Database Teaching
Authors: Cai Xiaoyan , Shen Wei , Cui Yanping , Meng Xianyu , Zhang Weiqing , Yan Zhizhi 
Published: March 2020

Abstract
This paper combines the design and development of student management system and integrates project-based teaching based on working process into the course of Oracle database technology. It guided by the working process and regarding the project as the carrier, and in accordance with the principle of “task-driven, practice-connected, work-integrated and strengthening ability”, combing the online and offline teaching integrates with “teaching, learning and doing”, fully arouses students’ learning enthusiasm and initiative, and enhances their comprehensive ability and sustainable development ability.
Research on Teachers’ Knowledge Sharing Features Based on Departmental WeChat Group
Authors: Wei Dandan , Qiu Lexing , He Jianting 
Published: March 2020

Abstract
The article analyzes the knowledge sharing process and behavior of teachers in the network professional community through social network analysis and content analysis. A semester of interactive data is selected as a sample in the college WeChat group. It analyzes social network structure of network professional community knowledge sharing and the interactive relationship from the aspects of community map, density, centrality, cohesive subgroups, core-edge, etc. The article analyses that, teachers’ knowledge sharing in departmental WeChat group presented the characteristics about complexity of shared subjects, unity of shared knowledge, missing interactions and sharing potential.
Dynamic Hurst Parameter Estimation of Multi-fractional Processes in Impulse Noise Environment
Authors: Zhao Shuyuan , Sheng Hu , Qiu Tianshuang 
Published: March 2020

Abstract
Hurst parameter estimation is the key issue for long range dependent system modeling and data prediction. Dynamic Hurst parameter estimation of data with impulse noise is difficult. In this research, the Dynamic Hurst parameter of multi-fractional signal is estimated using sliding windowed R/S method and generalized Hurst exponent. Simulation results show that sliding windowed R/S method and generalized Hurst exponent can effectively analyze the Hurst parameter of impulse noise contaminated signals.
Design and Implementation of Web-based Independent Learning Platform
Authors: Huang Yanyan , Huang Guanhang 
Published: March 2020

Abstract
With the continuous maturity of Internet and computer technology, it has had a profound impact on people’s lives. At present, the Internet also plays an extremely important role in education. Its application in teaching promotes the transformation of teaching mode and breaks the limitation of traditional classroom teaching. Especially in recent years, in order to adapt to the teaching reform, cultivate learners’ awareness of independent learning and improve learners’ comprehensive learning ability, people have established various types of independent learning platforms based on the Internet. However, as far as the existing learning platform is concerned, it still pays too much attention to the role of teachers, and the personalized needs and interactivity of users of the independent learning platform are not reflected. The purpose of this paper is to explore the design of the Web3.0 environment independent learning platform and strive to build an independent learning platform that ADAPTS to the development of The Times. This paper first gives an overview of Web3.0, and then designs and analyzes the independent learning platform. Then it proposes the specific implementation of the independent learning platform, and tests the platform with the help of data fusion algorithm. The experimental results of this paper show that the research and development of the Web3.0 environment independent learning platform can meet learners’ personalized needs, promote learners’ independent learning and effectively stimulate learners’ interest in learning.
Research on the application of “O2O” teaching mode based on mobile communication platform in the course of air transportation geography
Authors: Li Wei 
Published: March 2020

Abstract
Although smart phones have greatly changed people’s way of learning, it will also affect classroom teaching if it is not used normally. At present, this paper proposes an innovative teaching mode, which can connect classroom learning and extracurricular learning through mobile communication platform. The O2O teaching mode not only solves the problem of improper use of mobile phones, but also expands the breadth and depth of students’ autonomous learning. First of all, this paper analyzes the teaching organization of O2O teaching mode in the aviation transportation geography course. Then, this paper puts forward some problems in O2O teaching. Finally, some suggestions are put forward.
Research on the application of video technology under the digital media technology
Authors: Zhang Xin 
Published: March 2020

Abstract
Digital media technology is one of the most important information technology, which plays an important role in video technology. At present, video technology is the focus of the development of new generation electronic technology. Therefore, we must optimize the video technology, which will improve the visual effect of video. However, there are many problems in traditional video technology, such as poor visual effect and long running time, which need to optimize the video technology in the digital media technology environment. By analyzing the overall structure of the video technology structure, we can analyze the digital media processor, which will optimize the video technology. First of all, this paper analyzes the characteristics of digital media technology. Then, this paper analyzes the optimization technology of video technology. At last, this paper introduces the application of video technology.
The construction mode of China’s science and technology financial service platform under the background of internet finance
Authors: Li Ximei 
Published: March 2020

Abstract
With the rapid development of science and technology in China, the development potential of science and technology enterprises in China has gradually increased. Under the background of Internet finance, how to provide better service for science and technology finance has become a new research topic. By providing personalized services, we can optimize the regional financial ecological environment, which will alleviate the financing problem of small and medium-sized technology-based enterprises. Therefore, science and technology finance can improve the ecological system of science and technology enterprises. First, this paper analyzes the main background of the current technology finance platform. Then, according to ZhongGuanCun science and technology financial service platform model, this paper constructs a service platform model suitable for other regions. Finally, some suggestions are put forward.
Development of Online Music Education Supporting Autonomous Learning
Authors: Tian Lei 
Published: March 2020

Abstract
Through the investigation and study on the autonomous learning of music major students in the network environment, the characteristics of generality and individuality of music major students in autonomous learning under the network environment are analyzed in this paper, and some problems are identified. After research, solutions to these problems are proposed to guide students of music majors to use scientific and advanced online learning styles to learn music theory knowledge and skills, make up for the insufficiency of traditional teaching methods and achieve the purpose of promoting and improving learning efficiency.
Analysis on the Construction of Online Marketing Platform for Performing Arts Ticketing under the Background of Big Data
Authors: Ding Jiaran , Yu Lin 
Published: March 2020

Abstract
With the development of Internet technology and mobile information technology, the era of big data is coming. Technological innovation drives the transformation of marketing mode. In the era of big data, more efficient marketing mode has changed consumers’ habits of obtaining information and consumption. At present, China is vigorously promoting the construction of e-ticketing network system. The introduction of big data integrated marketing concept has a positive reference value for the transformation and upgrading of traditional e-ticketing network platform and the cultivation of performance industry market.
Practice of “Internet +” in Biology Teaching
Authors: Chen Weili , Lin Fanhui , Zhan Lili 
Published: March 2020

Abstract
The digital teaching resources represented by MOOCs (Massive Open Online Courses) have great potential to subvert traditional classrooms. Excessive digital teaching cannot promote teaching effectively. Hence, the Internet is used as a medium in this paper to analyze the advantages and disadvantages of online learning of the MOOC platform and the classroom teaching comprehensively. The principle of complementary advantages is adopted to explore the establishment and application of teaching mode for biology teaching courses. In specific practice, the online teaching contents of the online platform account for 35%. The feedback information after one round of application suggests that the teaching effect of mixed courses is good, and students are generally willing to accept the mixed course teaching mode.
The Effective Application of Big Data Analysis in Supply Chain Management
Authors: Yao Cenglin 
Published: March 2020

Abstract
In today’s world, the use of big data is almost everywhere. It has been widely used. Under the background of big data, how to carry out supply chain management based on big data technology and obtain scientific and effective valuable information has become an urgent problem for enterprises. This paper first analyzes the influencing factors of big data in the application of supply chain, and then studies the effective application of big data analysis in supply chain management.