Instability mechanism and control technology of soft rock roadway affected by mining and high confined water

查看全文 作　　者：Li [1]Guichen;Jiang [1]Zuohan;Lv [1]Chuangxin;Huang [2]Chao;Chen [2]Gui;Li [3]Mingyuan

机构地区：[1]School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining & Technology;[2]Huaibei Coal Mining Limited Company;[3]Huaibei Pingyuan Soft Rock Engineering Company

出　　处：《International Journal of Mining Science and Technology》索引2015年第25卷第4期,共8页

基　　金：the Natural Science Foundation of Jiangsu Province(No.BK20141130);the Fundamental Research Funds for the Central Universities(No.2014QNB27) 摘　　要：Based on deformation and failure characteristics of the second belt conveyor roadway at level II of Zhuxianzhuang coal mine, laboratory experiments, numerical calculation and field test were adopted to analyze the composition and microstructure of mudstone, the law of mudstone hydration and its strength weakening induced by water, the characteristics of surrounding rock deformation and failure under the action of confined water. Results showed that montmorillonite clay minerals accounted for as much as 76% of mudstone, with a large number of pores existing in the microstructure. Besides, as the molecular structure of montmorillonite changed, mudstone microstructure damage occurred with the macroscopic manifestation of its rheological instability. Weakening degree of confined water on residual strength of mudstone was almost 50%. The instability mechanism of soft rock roadway caused by high confined water is that surrounding rock circulates the process of ‘‘fracture-seepage-mud ding-closed'' twice, which weakens its strength and leads to roadway instability. A combined support technology, namely the, ‘‘high-toughness sealing layer + hollow grouting cables + full-length anchoring bolts with deep borehole'' was proposed. Based on field observation, the soft rock roadway was controlled effectively, which also verified the effectiveness of new control technology for surrounding rock. 关键词：软岩巷道高承压水控制技术失稳机理残余强度微观结构不稳定性朱仙庄煤矿

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Instability mechanism and control technology of soft rock roadway affected by mining and high confined water

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