煤矿深井巷道掘进全过程围岩变形破坏原位测试  

In-situ measurement of deformation and failure of surrounding rockmass during whole excavation process of deep coal mine roadway

作　　者：周辉[1] 胡善超[1,2] 卢景景[1] 王竹春[2,3] 张传庆[1] 渠成堃[1] 李震[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,湖北武汉430071 [2]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590 [3]兖矿集团济宁三号煤矿,山东济宁272100

出　　处：《岩土力学》2015年第12期3523-3530,共8页Rock and Soil Mechanics

基　　金：国家重点基础研究发展计划(973)项目(No.2014CB046902);中国科学院科技创新"交叉与合作团队"(No.人教字〔2012〕119号);中国科学院知识创新工程重要方向性项目(No.KZCX2-EW-QN115);国家自然科学基金项目(No.51427803)~~

摘　　要：传统研究对于煤系地层巷道围岩的变形破坏监测均在掘进面后方进行,无法获得巷道掘进全过程的围岩变形,更缺乏对煤矿深井巷道掘进全过程中围岩变形破坏规律的认识。为此,针对济宁三号煤矿深井巷道,通过超前布置监测断面,首次获得了煤矿深井巷道掘进全过程的围岩变形破坏规律;利用考虑体积应力的改进横观各向同性应变软化模型对巷道开挖全过程的围岩变形破坏特征进行分析。研究结果表明:在济宁三号煤矿七采区巷道地质条件下,浅部围岩的累计变形量和变形速率均大于深部围岩;巷道掘进全过程中,围岩变形随掘进面的推进经历了缓慢增长、迅速增长和变形稳定3个阶段;变形稳定后围岩松动圈深度约为1.0 m;巷道两帮围岩位移与破坏深度均在控制范围内,顶底板围岩破坏相对严重,并给出了相应解决方案。研究成果可为揭示煤矿深井巷道掘进围岩的变形破坏规律以及合理确定支护方案和参数提供重要的科学依据。Since the conventional deformation and failure measurement of surrounding rockmass in coal-bearing strata are conducted behind the heading face, it is difficult to obtain the deformation of surrounding rockmass, and thus it is challenging to further analyzes the characteristics of deformation and failure in whole excavating process of deep coal roadway. In this study, advance monitoring measurements are performed on deep coal mine roadway in Jining Coal Mine Ⅲ that are arranged at the first time and then the deformation and failure of surrounding rockmass in whole excavating process are characterized. An improved anisotropic stain-soften model with considering volumetric stress is adopted to analyze the characteristics of deformation and failure of surrounding rockmass during excavating. It is shown that both the cumulative deformation and its rate of superficial part are higher than the deep part under the geological condition of 7th mining area in Jining Coal Mine Ⅲ. It is also found that the deformation in the whole process of excavating goes through 3 stages, including slow growth, rapid growth and stable deformation. Moreover, the loosened zone is about 1.0 m when the deformation tends to be stable. After excavation, both the displacement and failure depth of roadway sides are in the controlled range. However, the failure of surrounding rockmass at the roof and floor are relative severe and the corresponding treatment measures are given. Therefore, this paper provides an important basis for revealing the deformation and failure characteristics and the rational determination of supporting scheme and parameters.

关 键 词：煤系地层 深井巷道 掘进全过程 原位测试 围岩变形破坏特征 

分 类 号：TU454[建筑科学—岩土工程]