摘要
采用立体直流电法,通过在井下巷道中煤层顶底板位置施工若干钻孔,在孔中埋置一定数量电极,形成孔间探测剖面,并根据采动进度测取不同时期岩层电场变化特征,进一步反演其三维立体电阻率值,可对上覆岩层受采动超前影响至后期变化规律进行全面的分析研究,为煤矿安全生产提供直观有效的技术参数。淮南某矿采面覆岩破坏顶底板跨孔立体电法测试应用中,共获得28组连续观测数据,对采动应力超前及顶板岩层变形与破坏裂隙发育特征给出动态分析,所获得的冒落带和裂隙带高度值与"三下"开采规程计算值相吻合。应用结果表明,与传统地面钻孔法及井下其他物探方法相比,该项自主创新技术具有测试成本低廉、结果判定准确、动态效应强等特点,其推广应用价值显著。
The three-dimensional DC method and technology for detecting overburden failure are introduced. Through several bores drilled in the top and floor rock of the coal seam in laneway, the detecting section between two bores is formed. Then through 64 poles fixed in different location of bores, the characteristics of the electric field in the top rock of different periods can be surveyed according to the mining plan. Through 3D inversion, the rock＇s resistivity of detecting area can be gained. So the changing characteristics of overburden distortion and failure from overtaking stress of mining to stable failure of anaphase can be analyzed and researched comprehensively. It provides effective technical parameters for safety production of mine. During the detecting application to overburden failure by 3D electrical method between two bores in Huainan Mine, 28 groups of data are obtained continuously. The dynamic developing characteristics of overtaking stress and rock＇s distortion and destruction because of mining are analyzed and given. The height results of caving zone and fractured zone are inosculate with the calculating value according to the mining regulations under water, railway and building. The results of application show that the detecting technology by 3D electrical method between two bores has several merits, such as low cost, accurate results and dynamic detecting characteristics, and so on, compared with the traditional drilling method from ground and other detecting methods in mine. The independent and innovative technology has remarkable application and extending values in similar mines.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2009年第9期1870-1875,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展计划(973)项目(2006CB202209)
中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目
关键词
采矿工程
覆岩破坏
立体电法
动态测试
煤层开采
mining engineering
overburden failure
3D resistivity method
dynamic detection
coal seam mining
