薄煤层切顶卸压沿空留巷关键参数研究  

KEY PARAMETERS OF GOB-SIDE ENTRY RETAINING FORMED BY ROOF CUT AND PRESSURE RELEASING IN THIN COAL SEAMS

作　　者：孙晓明[1,2] 刘鑫[1,2] 梁广峰[3] 王冬[1,2] 姜育林[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,北京100083 [2]中国矿业大学力学与建筑工程学院,北京100083 [3]兖州煤业股份有限公司南屯煤矿,山东邹城273500

出　　处：《岩石力学与工程学报》2014年第7期1449-1456,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金面上项目(51374214);国家自然科学基金重点项目(51134005);中央高校基本科研业务费专项资金资助项目(2009QL03)

摘　　要：以南屯煤矿1610工作面为工程背景,对薄煤层切顶卸压沿空留巷关键参数进行研究。通过对薄煤层工作面回采过程中顶板受力状态分析,确定影响薄煤层切顶卸压沿空留巷的关键参数为顶板预裂切顶高度、预裂切顶角度以及预裂爆破钻孔间距。数值模拟分析结果表明,当直接顶岩层厚度远大于采空区高度时,应在预裂切顶高度满足岩层下沉弯矩产生的拉应力使直接顶整体拉断的同时,预裂切顶面应向采空区偏转一定角度,从而有效切断采空区顶板与留巷顶板间的应力传递,实现顶板的顺利切落成巷。在此基础上,通过现场预裂爆破试验,确定最佳预裂爆破钻孔间距。研究成果在现场实际工程中成功实施,对于切顶卸压沿空留巷技术在薄煤层开采中的推广应用具有重要的借鉴意义。The key parameters in gob-side entry retaining formed by roof cutting and pressure releasing in thin coal seams at the working front 1610 in the Nantun coal mine were studied. The presplitting cutting height of roof, the presplitting cutting angle, the distance between presplitting blasting holes were determined as the key parameters based on the analysis of the stress state of roof in the process of mining. The results of numerical simulation show that, when the height of immediate roof is much higher than the height of gob and the presplitting cutting height meets the requirement of the tensile failure of immediate roof, the presplitting cutting face should deflect a certain angle towards gob in order to cut off effectively the stress transfer between the roof of gob and the roof of retaining roadway and achieve the collapsing of roof. Based on the results, the optimum distance between presplitting blasting holes was determined through field presplitting blasting test. The results have been successfully applied to an engineering project.

关 键 词：采矿工程 薄煤层开采 切顶卸压 沿空留巷 无煤柱开采 关键参数 

分 类 号：TD32[矿业工程—矿井建设]