特厚煤层综放开采采空区侧向支承压力演化全过程实测研究  

All Process Practical Test of Goaf Lateral Abutment Pressure with Fully Mechanized Top Coal Mining in Extral Thick Coal Seam

作　　者：张震[1,2] 王传华 王东攀[1,2] 黄志增[1,2] 庞立宁[1,2] 

机构地区：[1]天地科技股份有限公司开采设计事业部,北京100013 [2]煤炭科学研究总院开采研究分院,北京100013 [3]新矿集团秦华煤矿,新疆库尔勒841011

出　　处：《煤矿开采》2017年第2期78-82,92,共6页Coal Mining Technology

基　　金：国家自然科学青年基金项目(51504135);天地科技股份有限公司开采设计事业部青年创新基金(KJ-2014-TDKC-11)

摘　　要：为有效获取特厚煤层综放开采采空区侧向支承压力演化全过程,在相邻工作面巷道内利用煤层应力监测系统及电磁波CT探测设备,对采空区侧向支承压力动态演化和静态分布及扩展过程进行了实测分析。通过连续4个月动态监测数据分析发现:自工作面前方110m位置开始,采空区侧向15m范围内煤体支承压力随工作面推进持续发生变化,至采空区内120m趋于稳定;工作面侧向煤体垂直应力依次经历了稳定期、首次增长期、降低期、二次增长期及最终稳定期5个阶段;上覆岩层的破断和煤体塑性破坏2种因素的交叉,造成了采空区侧向不同位置应力峰值拐点时间的同步性及差异性,并以此分析了侧向支承压力动态演化机制。电磁波CT支承压力静态探测分析表明:由于上覆岩层破断的周期性及回转的不均衡性,采动影响范围内,采空区侧向支承压力沿走向方向呈现间隔局部承载的不连续性,分布形态是以某区域为承载中心向煤柱未破坏区近似弧形辐射分布,距离承载中心越远,支承压力越小。该研究结论对煤柱宽度的优化、临空巷道掘进时机的确定具有重要的参考意义。In order to obtain goal lateral abutment pressure dynamic evolution process of fully mechanized top coal mining in extra thick coal seam, and then coal seam strain monitoring system and electromagnet wave CT detection equipment were applied at next working face roadway, then goal lateral abutment pressure dynamic evolution, static distribution and development process was analyzed in prac- tical, after dynamic data analysis in four months, form position 110m ahead working face, goaf lateral coal body abutment pressure range 15m scope changed continued with working face advanced, then stable within 120m of working face, working face lateral coal vertical stress experienced the following 5 phases sequence, stable phase, first growth phase, decrease phase, second growth phase and the last stable phase, two different factors overlapped, which included overburden broken and coal seam plastic broken, and then goal lateral stress peak value inflection point time in different position was synchronization and difference, so dynamic evolution princi- ple of lateral abutment pressure was analyzed. The results of abutment pressure static exploration with electromagnet wave CT showed that as unbalance of overburden broken periodicity and rotation, within mining influence scope, goaf lateral abutment pressure ap- peared local loading discontinuity along strike direction, its distribution state like approximate arc distribution to unbroken area of coal pillar form loading center, abutment pressure became smaller with distance larger to loading center, the conclusions could reference for coal pillar width optimized, goaf side roadway excavation time determined and so on.

关 键 词：特厚煤层 侧向支承压力 动态演化 静态分布 

分 类 号：TD325.3[矿业工程—矿井建设]