巨厚砂泥岩互层条件下深部开采覆岩运动研究  

Study on Overlying Strata Movement in Deep Mining under the Condition of Thick Sandstone-mudstone Interbedded Conditions

作　　者：王洪伟 徐连满 WANG Hongwei;XU Lianman(School of Environment,Liaoning University,Shenyang,Liaoning 110036;Institute of Disaster Rock Mechanics,Liaoning University,Shenyang,Liaoning 110036)

机构地区：[1]辽宁大学环境学院,辽宁沈阳110036 [2]辽宁大学灾害岩体力学研究所,辽宁沈阳110036

出　　处：《中国煤炭地质》2025年第2期41-46,66,共7页Coal Geology of China

基　　金：国家自然科学基金资助项目(51904141)。

摘　　要：为研究巨厚砂泥岩互层条件下开采过程中覆岩运动规律,以红庆河煤矿五采区501工作面为例,采用3DEC数值模拟分析覆岩运动规律,运用现场实测、理论计算等方法对模拟结果进行检验。结果表明:随着工作面的回采,采空区两端与巷道两侧围岩一直处于应力集中状态,应力值随着工作面的推进而增大;上覆岩层常在工作面形成见方时刻发生破断、垮落,地表下沉速度增加,此时覆岩运动剧烈;地表下沉速度逐渐减小,呈现出“大范围、小位移”的特点;导水裂隙带高度在工作面初次见方前会迅速上升,见方后导水裂隙带高度基本趋于稳定为96 m,与经验公式相符;地表下沉值的骤变一般会伴随着大量微震事件的发生。模拟结果与现场实测数据对比显示,其平均误差约为6%,说明模拟结果准确可靠。Taking the 501 working face in the fifth mining area of Hongqinghe Coal Mine as an example,3DEC numerical simulation was used to study the law of overlying strata movement during mining under the condition of thick sandstone-mudstone interbedded conditions.The simulation results were verified by on-site measurement,theoretical calculation and other methods.The results show that with the mining of the working face,the both ends of the goaf and surrounding rocks at and on both sides of the roadway remain in a state of stress concentration,and the stress values increase as the working face advances.The overlying rock layers often break,collapse and the surface subsidence speed increases at the moment when the working face is square formed.At this time,the overlying strata movement is intense.The rate of surface subsidence gradually decreases,showing the characteristics of"large range,small displacement".The height of the water conducting fracture zone will rapidly increase before the first square-forming of the working face,and after the square-forming,the height of the water conducting fracture zone tends to stabilize at 96 meters,which is consistent with empirical formulas.Sudden changes in surface subsidence values are generally accompanied by a large number of microseismic events.The comparison between simulation results and on-site measured data shows an average error of about 6%,indicating that the simulation results are accurate and reliable.

关 键 词：深部开采 覆岩运动 巨厚砂泥岩 数值模拟 微震监测 地表沉陷 红庆河煤矿 

分 类 号：TD821[矿业工程—煤矿开采]