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Optimization of anchorage support parameters for soft rock tunnel based on displacement control theory

Journal of Mountain Science 2023年第7期20卷 2076-2092页

作者： LI Gan MA Wei-bin YU Chang-yi TAO Zhi-gang wang feng-nian School of Civil&Environmental Engineering and Geography Science Rock mechanics Research InstituteNingbo UniversityNingbo 315000China Railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing 100081China CCCC First Harbor Engineering Company Co.Ltd.Tianjin 300461 CCCC-Tianjin Port Engineering Institute Co.Ltd.Tianjin 300222 State Key Laboratory for Geomechanics&Deep Underground Engineering Beijing 100083China Shanxi Transportation Technology Research and Development Co. LTDTaiyuan 030032China

In the construction of a soft rock tunnel,it is critical to accurately estimate the pre-stressed anchor support parameters for surrounding rock reinforcement;otherwise,engineering disasters may *** paper presents a support parameter selection method that aims to allow deformation as a control objective,which was applied to the tunnel located in Muzailing Highway,Min County,Dingxi City,Gansu Province,*** theoretical analysis,we have identified five factors that influence pre-stressing *** selection of mechanical parameters for the rock mass was carried out using an inverse analysis *** with the measured data,the maximum displacement error of the numerical simulation results was only 0.07 *** length of anchor cable,circumferential spacing of anchor cable,longitudinal spacing,and pre-stress index are adopted as the input parameters for the support vector machine neural network model based on particle swarm optimization(PSO-LSSVM).Besides,the vault subsidence and the maximum deformation of surrounding rock are considered as output values(performance indices).The goodness of fit between the predicted values and the simulated values exceeds ***,all support parameters within the acceptable deformation range are *** optimal support variables are derived by considering the construction cost and *** field application results show that it is feasible to construct the sample database utilizing the numerical simulation approach by taking the displacement as the control target and using the neural network to specify the appropriate support parameters.

关键词： Displacement control theory Anchorage support parameters Numerical simulation PSOLSSVM Tunnel construction

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Movement and deformation characteristics of overlying rock mass in deep coal seam

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Journal of Mountain Science 2023年第6期20卷 1725-1741页

作者： LI Yong ZHENG Jing wang feng-nian HU Chao-wen YANG Fan MA Xin-gen TAO Zhi-gang College of Geoscience and Surveying Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China Shanxi Provincial Transportation Technology Research and Development Co.Ltd. Key Laboratory of Highway Construction and Maintenance Technology in Loess AreaTransportation IndustryTaiyuan 030000China Huaneng Coal Technology Research Co.Ltd. Beijing 100083China State Key Laboratory for Geo Mechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

The 110 mining method is an innovative and useful coal mining *** mainly relies on two technologies to improve coal mining rate:Top cutting and pressure relief,Negative Poisson’s ratio anchor cable(NPR anchor cable)*** study develops a large-scale physical model test using the speckle monitoring system(DIC),the stress-strain monitoring system,and the infrared thermal imaging system to deeply investigate the roadway deformation and failure law of the 110 mining method,the displacement movement mechanism of the overlying rock mass,and the change law of rock *** showed that pillarless coal mining utilizing mine pressure and rock fragmentation and expansion characteristics,the use of cut top pressure relief and NPR anchor stress compensation technology in the kilometer level of deep underground coal mining still has a positive effect along the tunnel *** addition,they can reduce surface subsidence,provide a scientific basis for ecological protection,and develop other kilometer-level deep soft rock high-ground stress underground projects.

关键词： Cut seam Displacement NPR anchor cable Physical model Numerical simulation

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Problems and Countermeasures of Academic Journal Covers

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Journalism and Mass Communication 2018年第3期8卷 129-135页

作者： wang feng-nian Tsinghua University BeijingChina

There are some problems in current academic journal covers,such as the unreasonable layout,volume of digital chaos,incomplete information,the proportion between the necessary information and images unmatched,rough cover from uncoordinated production,the lack of continuity of the publication style,and cover color matching *** to the normative principle,academic principle,simplicity principle,characteristic principle,certainty principle,aesthetic principle,innovative principle,stability principle,it is necessary to improve the cover design of the academic journals,such as,a reasonable match between the color and the content,the coordination from the front cover to the back cover.

关键词： academic journal cover cover design improved cover design

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Problems and Solutions Related to the Titles of Academic Papers

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Journalism and Mass Communication 2014年第1期4卷 72-75页

作者： wang feng-nian Tsinghua University Beijing China

There are some problems related to the titles of academic papers, such as, titles incorresponding to the contents, and titles being too general or colloquial. It is imperative to increase the title quality of an academic paper through peer-review, or by checking grammar mistakes with computer tools. The editors should also aim to improve their academic level of knowledge.

关键词： problems of academic paper titles principles for academic paper titles solutions of improving academic paper titles

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Experimental study on the movement law of overlying rock non-pillar coal overhead mining

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Journal of Mountain Science 2023年第6期20卷 1759-1773页

作者： LI Yong ZHENG Jing wang feng-nian MA Xin-gen ZHANG Rui-xue SUN Ying-ying YIN Jian-bin TAO Zhi-gang College of Geoscience and Surveying Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China Shanxi Provincial Transportation Technology Research and Development Co.Ltd. Key Laboratory of Highway Construction and Maintenance Technology in Loess AreaTransportation IndustryTaiyuan 030000China Huaneng Coal Technology Research Co.Ltd. Beijing 10o83China State Key Laboratory for Geo Mechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 10083China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

Pillarless coal mining technology is a new practical *** on the compensating mechanical behavior of the Negative Poisson’s Ratio(NPR)anchor cable on the roof,the roadway was successfully retained by the top cutting and pressure relief *** study utilizes the Digital Speckle Monitoring(DIC monitoring),stress-strain monitoring,and infrared thermal imaging systems to conduct physical model experiment of similar materials from the displacement,stress-strain,and temperature fields to investigate in depth the fracture change law of the overlying *** addition,it uses FLAC3D numerical simulation to invert the surface displacement *** results show that the non-pillar overhead mining under the 110 mining method has little influence on the rock crack in the middle of the coal seam,and the crack development area is mainly concentrated in the overlying rock mass of the upward coal *** compensatory mechanical behavior of NPR anchor cable and the dilatation characteristics of rock mass have a good effect of retaining roadway along goaf,and can also reduce surface *** 110 mining method provides a scientific basis for ecological environment protection and the development of other kilometer deep soft rock high ground stress underground projects.

关键词： No pillar mining Overhead mining NPR anchor cable Physical model of similar materials FLAC3D Numerical simulation Motion of overburden

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East Asian summer monsoon changes in subtropical China since late Pleistocene:Evidence from the Ailuropoda-Stegodon fauna

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Journal of Mountain Science 2022年第2期19卷 418-432页

作者： LI Zhi-wen SUN Li LI Bao-sheng wang feng-nian DU Ding-ding SONG You-gui ZHANG Hui-Juan CHEN Liu-qin XU Dan School of Environmental and Chemical Engineering Foshan UniversityFoshan 528225China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China School of Geography South China Normal UniversityGuangzhou 510631China School of Geography and Tourism Huizhou UniversityHuizhou 516007China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China

Previous studies on the amplitude of East Asian summer monsoon(EASM)changes mainly focused on northern China(represented by the Loess Plateau).However,a rare investigation centered on the subtropical zone of southern China,where the important route for EASM moved northward or southward,especially addressing a lack of the research on *** Ailuropoda-Stegodon fauna is a representative mammal fauna in southern China since the late *** indicates the southern mid-subtropicaltropical forest environment with tropical climate characteristics,and its southward or northward movements in the subtropical zone imply the changes of EASM *** on previous research,combined with the species characteristics and distribution range of the Ailuropoda-Stegodon fauna with tropical animals during the marine isotope stage 5(MIS5),MIS3,MIS2,and MIS1 Megathermal periods,this paper mainly investigates its evolution and the fluctuations of *** conclusions include:(1)The distribution geometric centers in the MIS5,MIS3,MIS2,and MIS1 Megathermal periods are(26°14′N,111°22′E),(24°35′N,107°30′E),(22°48′N,112°01′E),and(26°19′N,112°25′E),respectively.(2)Compared with the MIS5 period,the EASM of the MIS3 and MIS2 moved 180 km and 380 km southwards,and that of the MIS1 Megathermal period moved about 10 km *** EASM movement indicated by the fauna migration happened synchronous with the climate records of stalagmites in subtropical China,the sporopollen from eastern China,and oxygen isotopes from Sulu *** also correspond to the peaks and valleys of the total solar radiation at 35°N in the winter *** suggests that the migrations of the Ailuropoda-Stegodon fauna are consistent with the changes of the global climate,and the driving force is mainly from the changes of total solar radiation at 35°N in the winter half-year.

关键词： Late Pleistocene to Holocene Subtropical China the Ailuropoda-Stegodon fauna Tropical animals migration East Asian summer monsoon changes The total solar radiation

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The Design of PBL Network Teaching System based on Multi-Agent

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International Journal of Technology Management 2013年第7期 55-60页

作者： Ke Yu Xiao hong Li Yihua Du feng wang nian Ye Sichuan Luzhou Medical College of Clinical Medicine

With the utilization of computer technology and network technology in building network teaching system approaching perfection, PBL teaching model is gradually applied to network teaching. On the basis of PBL teaching theory, this paper proposes a network teaching system based on PBL via network teaching model, using C/S structure and Java language to develop the prototype model and adding multi-agent application level to C/S structure in system designing in order to meet the requirements of the utilization of PBL method in network teaching. This new system successfully implements the innovative application of a problem-based network teaching.

关键词： Multi-agent PBL Online Education System Design

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生态价值视野中的环境教育——从生态价值看我国的环境教育

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自然辩证法研究 2007年第5期23卷 74-77页

作者：王丰年清华大学<清华大学学报>编辑部北京100084

把自然因素列入价值体系将完善传统的价值观;把自然价值纳入环境教育体系不仅完善现行的道德体系,而且将引起办学模式和办学方向的转变,引起人类知识体系的转变。工业革命以前的价值观以损害自然的形式表现,具有“反自然”性质。在此价... 详细信息

把自然因素列入价值体系将完善传统的价值观;把自然价值纳入环境教育体系不仅完善现行的道德体系,而且将引起办学模式和办学方向的转变,引起人类知识体系的转变。工业革命以前的价值观以损害自然的形式表现,具有“反自然”性质。在此价值观的误导下,环境教育存在诸多弊端,应该探讨如何有效地完善现行的环境教育。

关键词：生态价值价值观环境教育

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论生态补偿的原则和机制

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自然辩证法研究 2006年第1期22卷 31-35页

作者：王丰年清华大学<清华大学学报>编辑部北京100084

文章分析了生态补偿的含义,考察了生态补偿的产生过程、经济学理论依据及其必要性,探讨了建立生态补偿机制的原则,研究了生态补偿的误区和症结,从提高自然资源的产权意识、完善生态税收制度等角度探讨了建立生态补偿的对策。

关键词：生态补偿生态税生态价值可持续发展

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Case study on the mechanics of NPR anchor cable compensation for large deformation tunnel in soft rock in the Transverse Mountain area,China

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Journal of Central South University 2024年第6期31卷 2054-2069页

作者： LI Yong ZHENG Jing HUO Shu-sen wang feng-nian HE Man-chao TAO Zhi-gang College of Geoscience and Surveying Engineering China University of Mining and Technology(Beijing)Beijing 100083China State Key Labortaory for Fine Exploration and Intelligent Development of Coal Resources China University of Mining and Technology(Beijing)Beijing 100083China State Key Laboratory for Tunnel Engineering China University of Mining and Technology(Beijing)Beijing 100083China Shanxi Provincial Transportation Technology Research and Development Co.Ltd. Key Laboratory of Highway Construction and Maintenance Technology in Loess AreaTransportation IndustryTaiyuan 030000China

A study was conducted to analyze the deformation mechanism of strongly weathered quartz schist in the Daliangshan Tunnel,located in the western Transverse Mountain area.A large deformation problem was experienced during the tunnel *** mitigate this problem,a support system was designed incorporating negative Poisson ratio(NPR)anchor cables with negative Poisson ratio *** model experiments,field experiments,and numerical simulation experiments were conducted to investigate the compensation mechanical behavior of NPR anchor *** large deformations of soft rocks in the Daliangshan Tunnel are caused by a high ground stress,a high degree of joint fracture development,and a high degree of surrounding rock fragmentation.A compensation mechanics support system combining long and short NPR anchor cables was suggested to provide sufficient counter-support force(approximately 350 kN)for the surrounding rock inside the *** the NPR anchor cable support system with the original support system used in the Daliangshan tunnel showed that an NPR anchor cable support system,combining cables of 6.3 m and 10.3 m in length,effectively prevented convergence of surrounding rock deformation,and the integrated settlement convergence value remained below 300 *** study provides an effective scientific basis for resolving large deformation problems in deeply buried soft rocks in western transverse mountain areas.

关键词： soft rock large deformation NPR anchor cable physical model numerical simulation compensation mechanics

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