检索结果-南通市图书馆

Study on the disaster caused by the linkage failure of the residual coal pillar and rock stratum during multiple coal seam mining:mechanism of progressive and dynamic failure

引用

International Journal of Coal Science & Technology 2023年第3期10卷 122-135页

作者： Yunliang Tan Qing Ma Xiaoli Liu Xuesheng Liu Derek Elsworth Ruipengg Qian Junlong Shang College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China Department of Energy and Mineral Engineering G3 Center and Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA16803USA James Watt School of Engineering University of GlasgowGlasgowG128QQUK

Multi-seam mining often leads to the retention of a significant number of coal pillars for purposes such as protection,safety,or water ***,stress concentration beneath these residual coal pillars can significantly impact their strength and stability when mining below them,potentially leading to hydraulic support failure,surface subsidence,and rock *** address this issue,the linkage between the failure and instability of residual coal pillars and rock strata during multi-seam mining is examined in this *** controls include residual pillar spalling,safety factor(f.),local mine stiffness(LMS),and the post-peak stiffness(k)of the residual coal *** separating the two forms of failure,progressive versus dynamic,are *** failure results at lower stresses when the coal pillar transitions from indefinitely stable(f,>1.5)to failing(f,<1.5)when the coal pillar can no longer remain stable for an extended duration,whereas sud-den(unstable)failure results when the strength of the pillar is further degraded and *** transition in mode of failure is defined by the LMS/k *** transitions from quiescent to dynamic as LMS/k.<1,which can cause chain pillar instability propagating throughout the *** study provides theoretical guidance to define this limit to instability of residual coal pillars for multi-seam mining in similar mines.

关键词： Multi-seam mining Residual coal pillars rock stratum Linkage instability mechanism Local mine stiffness

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Study on the pipe friction resistance in long-distance rock pipe jacking engineering

引用

Underground Space 2023年第2期9卷 173-185页

作者： Peng Chen Xinrong Liu Zhiyun Deng Ninghui Liang Libing Du Han Du Yedi Huang Lingyun Deng Gaoyang Yang School of Civil Engineering Chongqing UniversityChongqing 400045China Chongqing Municipal Design and Research Institute Co. Ltd.Chongqing 404100China State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China Powerchina Chengdu Engineering Co. Ltd.ChengduSichuan 610072China Wuhan Branch of China Construction Steel Structure Co. Ltd.WuhanHubei 430000China

Previous studies on pipe friction resistance are mainly concentrated in the soil layer,whereas the study on that in the rock stratum is *** estimate the pipe friction resistance in the rock stratum,the calculation models of pipe friction resistance and their applica-tion conditions were compared *** the friction resistance calculation model for pipe jacking in the rock stratum was established and ***,the measured(FM)and the computed(FN)pipe friction resistance was compared to validate the simplified friction resistance calculation *** following conclusions can be drawn:(1)The existing calculation methods of pipe friction resistance can be well verified in the soil layer but cannot be applied in the rock stratum.(2)Sediment,pipe–rock friction coefficient and mud buoyancy are the main factors affecting the pipe friction resistance in long-distance rock pipe jacking engineering.(3)The simplified calculation model established by Deng et *** estimate the pipe friction resistance in different rock strata at different jacking stages with satisfac-tory *** research on the pipe-rock friction coefficient in different rock strata with different pipe–rock contact conditions merits further investigation to better predict the pipe friction resistance in the rock *** research results have certain practica-bility and can provide a reference for similar projects.

关键词： Pipe jacking Calculation model Friction resistance Pipe-rock contact state rock stratum

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ground-borne vibration generated by high-speed train viaduct systems in soft-upper/hard-lower rock strata

引用

Journal of Central South University 2021年第7期28卷 2140-2157页

作者： XING Meng-ting WANG Ping ZHAO Cai-you WU Xue KANG Xiu-shan Key Laboratory of High-Speed Railway Engineering(Ministry of Education) Southwest Jiaotong UniversityChengdu 610031China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China China Construction Third Engineering Bureau Co.Ltd Wuhan 430000China

An experimental study and theoretical analysis were carried out to explore the ground-borne vibration generated by elevated high-speed railway in rock *** a typical rail line constructed on rock area in China as the research object,a set of field tests was performed on Rizhao-Lankao High-Speed Railway,the bridge and ground vibrations were measured as trains passed at 330−340 km/h,then the transferring law and spatial distribution under individual frequencies were *** experiment results indicate that the bridge frequency spectrum exhibited relatively high-frequency vibration peaks caused by short-wavelength irregularity;ground vibration farther than 30 m away can be amplified with a higher frequency and numerous ***,the wave propagation equation of a stratified rock strata was established based on direct-stiffness method to explore the vibration attenuation rules via frequency-domain *** is found that the rock area has a weaker correlation between vibration transmissibility and frequency,thicker and harder rock strata loss their vibration attenuation *** can be concluded that the high-speed railways induced vibration on rock strata shows a wide frequency band and large amplitude,the design of reducing vibration aimed at specific frequency is important according to next more detailed numerical study.

关键词： rock stratum vibration and wave elevated high-speed railways in situ test transferring law

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Some Regularities in Cracking Phenomenonof the Earth Crust

引用

Journal of Beijing Institute of Technology 1997年第3期6卷 244-252页

作者：郑联达北京理工大学应用物理系

The cracking phenomenon of the vast underground rock stratum that has been accumulated for long years due to earghquakes is basically similar to the cracking process of the focus of an seism or a rock specimen.

关键词： rock stratum earthquakes cracking landscape

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：