高应力巷道锚穿钢管混凝土支护技术研究  

Study on technology of anchor concrete- filled steel tube supporting structure in roadway with high stress

作　　者：冯月新[1] 孟波[2] 

机构地区：[1]大同煤矿集团有限责任公司,山西大同037003 [2]中国矿业大学力学与建筑工程学院,江苏徐州221116

出　　处：《煤炭科学技术》2015年第4期1-5,共5页Coal Science and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2013CB036003);国家自然科学基金资助项目(51374198;51074162)

摘　　要：为了解决山西某矿二水平辅助运输大巷大规模、反复变形破坏的技术难题,通过钻孔摄像得到了围岩破裂发育特征,并在此基础上使用特制测力锚杆对围岩内部位移及锚杆受力进行了测量。研究表明:锚杆在裂隙附近受到拉、压、剪综合作用发生弯曲变形破坏;在高水平地应力作用下围岩发生剪切破坏,破裂块体之间的相对滑移是大巷发生强烈持续变形的根本原因。据此提出了锚穿钢管混凝土支护结构,该结构具有高预紧力、高锚固力、高抗剪强度的优点,可有效发挥阻剪抗滑的作用。最终制定了锚穿钢管混凝土与钢筋混凝土砌碹联合支护方案,并进行了工业性试验。经过位移观测,试验段巷道最大变形量仅有50~82 mm,从根本上解决了该矿二水平辅助运输大巷长期、反复、大规模变形的问题。In order to solve the problem of large- scale and repeated deformation of second level auxiliary haulage roadway in some coal mine,the fracture developing characteristic of surrounding rock was obtained by drilling hole camera,based on which the stress and displacement of surrounding rock were measured with specially designed force anchor bolts. The results showed that anchor bolts would curve and fail under the combined effect of stretch,compression and shear around fracture. The shear failure would occur in surrounding rock with high level ground stress. The relatively slipping of fractured block after shearing failure of surrounding rock was the root cause of intensively and persistent deformation of roadway,according to which the anchor concrete- filled steel tube supporting structure which obtained advantages such as high pre- stress,high anchorage force and high anti- shear strength was proposed. Ultimately,combined supporting scheme of anchor concrete- filled steel tube supporting structure with reinforced concrete was made and industrial test was carried out. The displacement observation result showed that deformation of test section roadway was only 50 ~ 82 mm. The problem of continuous,repeated and large- scale deformation of second level auxiliary haulage roadway.

关 键 词：高应力巷道 围岩稳定性 钢管混凝土 高强支护 

分 类 号：TD353[矿业工程—矿井建设]