开滦东欢坨矿北二采区上行开采5煤层可行性分析  

Feasibility analysis on upward mining for No.5 coal seam in No.2 north district of Donghuantuo Coal Mine,Kailuan

作　　者：马亚杰 郑燕 刘伯[2] 刘金国[2] 

机构地区：[1]华北理工大学,河北唐山063009 [2]开滦(集团)有限责任公司,河北唐山063000

出　　处：《煤炭工程》2016年第B11期60-63,共4页Coal Engineering

摘　　要：针对东欢坨矿北二采区上行开采5煤层可行性进行研究。在分析北二采区5煤层上行开采影响因素的基础上,采用"三带法"、"比值法"进行了初步的经验方法判别。建立工作面开采数值模型预测回采下部8煤层与上行开采5煤层后顶板裂缝带波及范围。经验判别得出5煤层位于8煤层垮落带之上,采动影响系数大于经验临界值7.5,上行开采5煤层可行。数值模拟了采动影响下围岩的扩容区,以体积应变大于等于0.025的等值线密集区视为导水裂隙区,得到8煤层回采顶板导水裂缝带最大高度为53m,上行开采5煤层后顶板导水裂缝带最大高度向上增长0.4m。下部8煤层开采将5煤层顶板改造为极软弱顶板,导致其裂缝带发育高度偏小,利于上行开采。The upward mining feasibility （UMF） was analyzed for No. 5 coal seam in No. 2 north district of Donghuantuo Coal Mine. Factors of UMF in study area were analyzed, then the experiential methods of ＂three roof zone＂ and ＂mining affected coefficient＂ were applied for primary judgment. Numerical model of working face was built to predict the height of roof crack zone after the mining of No. 8 and No. 5 coal seam. According to experiential judgment, the No. 5 coal seam was above the caving zone of No. 8 coal seam, mining influence coefficient was larger than the experimental critical value 7.5, so the upward mining of No. 5 coal seam was feasible. In numerical model, dilatation of surrounding rocks was simulated, inner zone in which volume strain contours densely distributed and volume strain I〉0. 025 was regarded as crack zone, so the height of No. 8 coal seam roof water flowing fracture zone would be 53m, when No. 5 coal seam was continually mined, the height could extend 0. 4m upward. Because mining of No. 8 coal seam softened surrounding rocks, the height of water- flowing roof crack zone of No. 5 coal seam would be obviously reduced, upward mining of No. 5 coal seam was feasible.

关 键 词：上行开采 顶板“三带” 采动影响系数 顶板导水裂缝带高度 体积应变 

分 类 号：TD823[矿业工程—煤矿开采]