厚渣堆下多煤层重复开采覆岩结构及矿压机理分析  

Analysis of Overlying Srata Structure and Ground Pressure Mechanism in Repeated Mining of Multiple Coal Seams under Thick Slag Pile

作　　者：梁广宁 LIANG Guangning(Gongwusu Coal Mine,Wuhai Energy Co.,Ltd.,State Energy Group,Wuhai 016000,China)

机构地区：[1]国家能源集团乌海能源有限责任公司公乌素煤矿,内蒙古乌海016000

出　　处：《煤》2025年第2期7-11,15,共6页Coal

基　　金：内蒙古自然科学基金资助项目(2021BS05011)。

摘　　要：文章以公乌素煤矿021601综放工作面地质资料为背景,采用现场监测、数值模拟及理论分析等综合研究方法,总结了厚渣堆下多煤层重复开采覆岩结构及矿压机理,建立了021601工作面覆岩结构失稳模型,得到了该条件下的覆岩结构特征及矿压显现机理。得出如下结论:(1)现场实测表明,工作面矿压显现强度较小,来压特征主要以大小周期循环来压为主,大周期来压之间会发生2~3次小周期来压;(2)覆岩两关键层周期破断是造成工作面大小周期来压的根本原因,关键层及其所控制的岩层内部载荷释放并向下传递时在应力释放层中损耗了大部分能量,故工作面来压强度较小,渣堆对工作面矿压显现影响不明显。Based on the geological data of the No.021601 fully-mechanized sub-level caving face in Gongwusu coal mine,this paper adopts comprehensive research methods such as field monitoring,numerical simulation and theoretical analysis,the overlying rock structure and ground pressure mechanism of multiple coal seams under thick slag pile are summarized,and the instability model of overlying rock structure in 021601 working face is established.The following conclusions are drawn:①the field measurement shows that the strength of the ground pressure is small,and the main character of the pressure is the cycle of large and small periods,and there will be 2~3 times of small period pressure between large periods;②periodic failure of two key strata of overburden is the fundamental cause of large and small periodic weighting of working face,and most energy is lost in the stress releasing layer when the internal load of key strata and strata controlled by them is released and transmitted downwards,therefore,the pressure strength of the working face is small,and the slag pile has no obvious influence on the ground pressure behavior of the working face.

关 键 词：厚渣堆 多煤层开采 矿压显现规律 覆岩结构 

分 类 号：TD325[矿业工程—矿井建设] TD323