小康矿软岩回采巷道互补支护技术.doc

极软岩回采巷道互补控制支护技术研究 姜耀东1，2，王宏伟2，赵毅鑫1，2，刘长海3，朱喜东3 (1. 煤炭资源与安全开采国家重点实验室，北京100083；2. 中国矿业大学 力学与建筑工程学院，北京100083；3. 铁法煤业(集团)有限责任公司，辽宁 112700) 摘要：从加固破碎岩体和提高支护阻力两方面综合研究入手，分析小康煤矿巷道围岩的力学及变形破坏特征，得出小康煤矿软岩回采巷道围岩失稳机制，指出原有支护系统变形不协调、支护阻力低和没有发挥围岩的承载能力是导致巷道破坏和支护失效的主要原因。以铁法矿业集团小康矿S2N8运输顺槽为工程实例，研究高强度高预紧力锚杆、强力锚索、金属网和喷浆加固以及U型钢在控制围岩变形中的互补作用，详细介绍高强度、高预紧力锚网索配合U型钢可缩支架的互补控制综合支护方案并进行现场工业试验。研究表明互补控制支护技术能够避免极软岩回采巷道的多次翻修，实现支护一次到位。 关键词：软岩；预紧力；互补控制；失稳机制 STUDY OF COMPLEMENTARY SUPPORTING TECHNOLOGY OF EXTREMELY SOFT ROCK MINING ROADWAY JIANG Yaodong1，2，WANG Hongwei2，ZHAO Yixin1，2，LIU Changhai，ZHU Xidong(1. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology，Beijing 100083，China；2. School of Mechanics，Architecture and Civil Engineering，China University of Mining and Technology，Beijing 100083，China；3. Tiefa Coal Industry Group Co.，Ltd.，，Liaoning 112700) Abstract：By using the method of strengthening broken rock and increasing supporting resistance，the mechanical properties，deformation and failure characteristics of surrounding rocks in Xiaokang coal mine are analyzed. Meanwhile，the instability mechanism of soft rock mining roadway is obtained and it is pointed out that the main reasons of supporting failure are inconsistent deformation，low supporting resistance and failure to utilize the supporting capability of the surrounding rocks. Taking the S2N8 haulage roadway of Xiaokang coal mine for example，the complementarity of the high strength bolt，high pretension cable，metal mesh and U-shaped contractible frame in the process of reinforcing surrounding rock is studied. Based on these studies，the complementary supporting technology of high strength and pretension bolt-mesh-cable supporting together with U-shaped contractible frame is introduced. In addition，in-situ industrial test has also been implemented；and the results show that the complementary supporting system can successfully avoid the multi-rebuilding in extremely soft rock mining roadway and the sup