不同支护形式下深部巷道支护对比试验研究  

Experimental study on different supporting forms in deep roadway

作　　者：张斌川[1] 卢辉[1] 刘路[1] 卢志江 保天才 李炜强 王福利[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京市海淀区100083

出　　处：《中国煤炭》2014年第12期38-41,共4页China Coal

基　　金：国家自然基金面上项目(51374217);教育部博士点基金(20120023120008);中央高校基本业务费项目(2011QZ01)

摘　　要：针对协庄矿1202E运输巷支护现状,通过现场工业性试验,对相同条件下深部软岩巷道采用原全螺纹钢锚杆支护、淮北高强锚杆支护和高预紧力强力锚杆支护3种支护形式进行对比试验研究,分析了试验结果。试验结果表明,全螺纹钢锚杆支护由于强度低、预紧力小,支护效果差,断面收缩率为45.5%;淮北高强锚杆支护在锚杆受力和控制巷道变形方面有所改善,但还不能满足支护要求;高预紧力强力锚杆强度与刚度大,实现了高预紧力,杜绝了锚杆拉伸破坏,有效控制了顶板离层和两帮位移,顶板离层量小于10 mm,底臌量在300mm以内,两帮移近量小于200mm,断面收缩率仅为13.6%。因此,相比前两种支护,高预紧力强力锚杆支护能更有效地控制巷道围岩变形发展,提高围岩的稳定性。In view of the supporting status in 1202E transportation gateway of Xiezhuang coal mine,through the in-situ industrial test,3 supporting ways of original full-thread steel bolt support,Huaibei high-strength bolt support and high-pretension powerful bolt support adopted in deep soft-rock roadway under the same conditions are researched comparatively,and the re-sults are analyzed.The results show that the full-thread steel bolt support is of low strength,low pretension and has bad supporting effect,and the area reduction of roadway is 45.5 %;the Huai-bei high-strength bolt support does better in the aspect of bolt stress and roadway deformation control,whereas it does not meet the factual supporting demand of the roadway;the high-preten-sion powerful bolt is of high strength,high stiffness and high pretension,and eradicates the ten-sile failure of bolt,which has effectively controlled the roof separation and two ribs displacement：the roof separation is less than 10 mm,the floor heave less than 300 mm,and the convergence of two ribs is less than 200 mm,and the area reduction is only 13.6%.Therefore,compared with the other two supporting ways,the high-pretension powerful bolt support can control the de-formation development of roadway surrounding rock more effectively and obviously improve the stability of roadway surrounding rock.

关 键 词：深部巷道 软岩巷道 工业性试验 锚杆支护 围岩控制 

分 类 号：TD353.6[矿业工程—矿井建设]