CAJ | 학술논문

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。
이남둔매광1610공작면위공정배경，대박매층절정사압연공류항관건삼수진행연구。통과대박매층공작면회채과정중정판수력상태분석，학정영향박매층절정사압연공류항적관건삼수위정판예렬절정고도、예렬절정각도이급예렬폭파찬공간거。수치모의분석결과표명，당직접정암층후도원대우채공구고도시，응재예렬절정고도만족암층하침만구산생적랍응력사직접정정체랍단적동시，예렬절정면응향채공구편전일정각도，종이유효절단채공구정판여류항정판간적응력전체，실현정판적순리절락성항。재차기출상，통과현장예렬폭파시험，학정최가예렬폭파찬공간거。연구성과재현장실제공정중성공실시，대우절정사압연공류항기술재박매층개채중적추엄응용구유중요적차감의의。
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.