综采工作面垮落带注浆充填开采覆岩采动裂隙定量表征试验研究
Quantitative characterization of mining-induced cracks in overlying strata of grouting filling mining in caving area of fully mechanized mining face
李志华 1耿倩 1杨科 1邹恩隆 1何祥1
作者信息
- 1. 安徽理工大学矿业工程学院,安徽淮南 232001;安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南 232001
- 折叠
摘要
为定量表征冒落区注浆充填对覆岩采动损伤程度的影响,以任家庄煤矿 110903工作面为研究背景,开展垮落法开采和垮落带充填法开采物理相似模拟实验,运用分形理论研究两者覆岩裂隙演化特征,并对其覆岩运移规律进行对比分析.研究结果表明,垮落法开采后采动裂隙分形维数变化规律为迅速上升-缓慢下降-缓慢上升-急剧上升,注浆充填开采后变化规律呈迅速上升-迅速下降-缓慢下降-缓慢上升;将采动裂隙发育网络划分为离层裂隙区、离层压实区、垮落裂隙区、竖向破断裂隙区四个区域,对比垮落法开采和垮落带充填法开采,充填后采场覆岩裂隙不发育,离层压实区范围较小,发育高度仅为 21.96 m;注浆充填开采后各关键层下沉量显著减小,关键层 2最大下沉量出现在顶板初次破断处,垮落法开采后关键层2最大下沉量出现在采空区中部.垮落带注浆充填开采能有效改善覆岩裂隙损伤、控制覆岩裂隙发育、减缓覆岩下沉,该成果可以为任家庄煤矿充填开采控制地表沉降提供一定的理论依据.
Abstract
To quantitatively characterize the influence of grouting filling in caving area on the degree of mining-induced damage of overlying strata,taking the 110903 working face of Renjiazhuang Coal Mine as the research background,the physical similarity simulation experiments before and after grouting filling mining by caving mining and caving area filling mining are carried out.The fractal theory is used to study the evolution characteristics of cracks of overlying strata,and the migration law of overlying strata is compared and analyzed.The results show that the change law of fractal dimension of mining-induced cracks after caving mining without grouting filling is rapid rise-slow decline-slow rise-rapid rise,and the change law after grouting filling mining is rapid rise-rapid decline-slow decline-slow rise.The mining-induced crack development network is divided into four areas:the separation crack area,the separation compaction area,the caving crack area and the vertical breaking crack area.Compared with the caving mining and the caving area filling mining before and after the filling,the cracks of overlying strata are not developed after the filling,and the separation compaction area is small,and the development height is only 21.96 m.After grouting filling mining,the subsidence of each key stratum decreases significantly.The maximum subsidence of key stratum 2 appears at the initial crack of roof.The maximum subsidence of key stratum 2 appears in the middle of goaf after caving mining before grouting mining.Grouting filling mining in caving area can effectively improve the crack damage of overburden rock,control the development of cracks of overlying strata and slow down the subsidence of overlying strata.The results can provide a theoretical basis for filling mining to control surface subsidence in Renjiazhuang Coal Mine.
关键词
垮落带注浆充填/相似模拟/分形理论/裂隙演化/覆岩运移Key words
grouting filling in caving area/similarity simulation/fractal theory/crack evolution/overlying strata migration引用本文复制引用
基金项目
国家重点研发计划专项资助(2019YFC1904304)
安徽省高等学校科学研究项目资助(2022AH050839)
安徽理工大学高层次引进人才科研启动基金资助(2021yjrc11)
安徽省关闭/废弃矿井资源开发利用工程研究中心项目(EUCMR-2022-07)
安徽省高校协同创新项目资助(GXXT-2021-017)
出版年
2024
NETL
NSTL
维普
万方数据