大倾角煤层开采“关键域”转换与岩体结构平衡特征  

Critical zone conversion and rock structure balance characteristics in mining the steeply dipping seam

作　　者：王红伟[1,2] 伍永平[1,2] 解盘石[1,2] 曹沛沛[2] 

机构地区：[1]西部矿井开采及灾害防治教育部重点实验室,陕西西安710054 [2]西安科技大学能源学院,陕西西安710054

出　　处：《辽宁工程技术大学学报（自然科学版）》2016年第10期1009-1014,共6页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金项目(51204132);陕西省青年科技新星支持计划项目(2015KJXX-36);陕西省自然科学基础研究计划(2016JQ5019)

摘　　要：为解决大倾角煤层走向长壁开采过程中采场围岩中"关键域"非确定性和岩体结构变异问题.采用平面、三维立体相似模拟实验、数值分析、理论分析等综合研究方法,分析了沿工作面倾斜方向不同区域"关键域"转换和岩体结构平衡机制,结果表明:在覆岩"应力-冒落"双拱作用下,工作面下部"关键域"向直接顶和伪顶岩层转移,岩体结构破断方式为直接垮落,中部"关键域"处于基本顶中下位岩层中,岩体结构破断方式为一次回转垮落,上部"关键域"向基本顶上位岩层中转移,岩体结构破断方式为二次回转垮落,不同区域岩体结构破断的分区特征,导致了工作面来压的时序性和非均衡性.In view of the non-definiteness of critical zone and variation of rock structure within the stope during the process of mining steeply dipping seam, with a hybrid methodology including the plane and three-dimensional physical simulation, numerical simulation, and theory analysis, this paper investigated the critical zone conversion and rock structure balance mechanism in different areas along the tendency of working face. The results show that under action of stress and caving arch the critical zone would shift towards immediate roof and structure balance was direct caving mode at lower zone of the stope, the critical zone lie in lower part of main roof and structure balance was one rotary caving mode at middle area of the stope, and the critical zone would transmit to upper part of main roof and structure balance was secondary rotary caving mode at top area of the stope. The partition feature of structure balance led to the timing and unbalanced roof weighting in working face.

关 键 词：大倾角煤层 关键域转换 倾向梯阶结构 顶板垮落 平衡特征 

分 类 号：TD323[矿业工程—矿井建设]