Based on the transmitting theory of "smoke ring effect", the transient electromagnetism technique was used in coal mines to detect abnormal areas of aquiferous structures in both roofs and floors of coal sea...Based on the transmitting theory of "smoke ring effect", the transient electromagnetism technique was used in coal mines to detect abnormal areas of aquiferous structures in both roofs and floors of coal seams and in front of excavated roadways. Survey devices, working methods and techniques as well as data processing and interpretation are discussed systematically. In addition, the direction of mini-wireframe emission electromagnetic wave of the full space transient electromagnetism technique was verified by an underground borehole for water detection and drainage. The result indicates that this technique can detect both horizontal and vertical development rules of abnormal water bodies to a certain depth below the floor of coal seams and can also detect the abnormal, low resistance water bodies within a certain distance of roofs. Furthermore, it can detect such abnormal bodies in ahead of the excavated roadway front. Limited by the underground environment, the full space transient electromagnetism technique can detect to a depth of only 120 m or so.展开更多
为总结全球范围内煤矿安全管理的研究现状并预测其未来发展趋势,借助Cite Space V软件,对1992--2017年期间Web of Science(wos)收录的“煤矿”“安全管理”领域的相关文献进行可视化知识图谱分析。通过对该领域主要研究机构及国家、作...为总结全球范围内煤矿安全管理的研究现状并预测其未来发展趋势,借助Cite Space V软件,对1992--2017年期间Web of Science(wos)收录的“煤矿”“安全管理”领域的相关文献进行可视化知识图谱分析。通过对该领域主要研究机构及国家、作者等方面进行可视化分析,描述该领域的主要研究力量及研究人员的分布;通过对关键词、研究聚类等进行知识图谱可视化分析,描述该领域的研究热点及未来发展趋势。结果表明:该领域的研究主要集中于中国、美国,且主要研究机构大多为各国高校,作者间合作以小范围团队合作为主;研究主要集中于安全教育、人因失误、数据挖掘以及职业病防治等方面;数据挖掘是该领域未来研究发展趋势之一。展开更多
Accidents such as support failure and excessive deformation of roadways due to drastic changes in strata behaviors are frequently reported when mining the extra-thick coal seams Nos.3e5 in Datong coal mine with top-co...Accidents such as support failure and excessive deformation of roadways due to drastic changes in strata behaviors are frequently reported when mining the extra-thick coal seams Nos.3e5 in Datong coal mine with top-coal caving method,which significantly hampers the mine's normal production.To understand the mechanism of strata failure,this paper presented a structure evolution model with respect to strata behaviors.Then the behaviors of strata overlying the extra-thick coal seams were studied with the combined method of theoretical analysis,physical simulation,and field measurement.The results show that the key strata,which are usually thick-hard strata,play an important role in overlying movement and may influence the mining-induced strata behaviors in the working face using top-coal caving method.The structural model of far-field key strata presents a "masonry beam" type structure when"horizontal O-X" breakage type happens.The rotational motion of the block imposed radial compressive stress on the surrounding rock mass of the roadway.This can induce excessive deformation of roadway near the goaf.Besides,this paper proposed a pre-control technology for the hard roof based on fracture holes and underground roof pre-splitting.It could effectively reduce stress concentration and release the accumulated energy of the strata,when mining underground coal resources with top-coal caving method.展开更多
文摘Based on the transmitting theory of "smoke ring effect", the transient electromagnetism technique was used in coal mines to detect abnormal areas of aquiferous structures in both roofs and floors of coal seams and in front of excavated roadways. Survey devices, working methods and techniques as well as data processing and interpretation are discussed systematically. In addition, the direction of mini-wireframe emission electromagnetic wave of the full space transient electromagnetism technique was verified by an underground borehole for water detection and drainage. The result indicates that this technique can detect both horizontal and vertical development rules of abnormal water bodies to a certain depth below the floor of coal seams and can also detect the abnormal, low resistance water bodies within a certain distance of roofs. Furthermore, it can detect such abnormal bodies in ahead of the excavated roadway front. Limited by the underground environment, the full space transient electromagnetism technique can detect to a depth of only 120 m or so.
基金Supported by the Science and Technological Fund of Anhui Province for Outstanding Youth （1108085J02）, the National Natural Science Foundation of Anhui Province （K J2010A090）
文摘为总结全球范围内煤矿安全管理的研究现状并预测其未来发展趋势,借助Cite Space V软件,对1992--2017年期间Web of Science(wos)收录的“煤矿”“安全管理”领域的相关文献进行可视化知识图谱分析。通过对该领域主要研究机构及国家、作者等方面进行可视化分析,描述该领域的主要研究力量及研究人员的分布;通过对关键词、研究聚类等进行知识图谱可视化分析,描述该领域的研究热点及未来发展趋势。结果表明:该领域的研究主要集中于中国、美国,且主要研究机构大多为各国高校,作者间合作以小范围团队合作为主;研究主要集中于安全教育、人因失误、数据挖掘以及职业病防治等方面;数据挖掘是该领域未来研究发展趋势之一。
基金supported by the Special Funding Projects of“Sanjin Scholars”Supporting Plan(Grant No.2050205)
文摘Accidents such as support failure and excessive deformation of roadways due to drastic changes in strata behaviors are frequently reported when mining the extra-thick coal seams Nos.3e5 in Datong coal mine with top-coal caving method,which significantly hampers the mine's normal production.To understand the mechanism of strata failure,this paper presented a structure evolution model with respect to strata behaviors.Then the behaviors of strata overlying the extra-thick coal seams were studied with the combined method of theoretical analysis,physical simulation,and field measurement.The results show that the key strata,which are usually thick-hard strata,play an important role in overlying movement and may influence the mining-induced strata behaviors in the working face using top-coal caving method.The structural model of far-field key strata presents a "masonry beam" type structure when"horizontal O-X" breakage type happens.The rotational motion of the block imposed radial compressive stress on the surrounding rock mass of the roadway.This can induce excessive deformation of roadway near the goaf.Besides,this paper proposed a pre-control technology for the hard roof based on fracture holes and underground roof pre-splitting.It could effectively reduce stress concentration and release the accumulated energy of the strata,when mining underground coal resources with top-coal caving method.
