黄土沟谷区采空区充填对地表变形规律的影响研究  

Study on the influence of goaf filling on surface deformation in loess gully area

作　　者：关军琪 吕义清[1] 赵国贞 GUAN Junqi;LYU Yiqing;ZHAO Guozhen(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of In-situ Property-improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024 [2]太原理工大学原位改性采矿教育部重点实验室,山西太原030024

出　　处：《煤矿安全》2022年第1期49-55,共7页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51904199)。

摘　　要：为了研究受地形条件影响下不同充填方案对覆岩及地表变形规律的影响,根据芦子沟煤矿采矿及地质条件,应用FLAC^(3D)软件模拟分析了多种考虑地形因素的充填方案数值模型;分析研究了不同充填率、不同充填位置情况下,采空区顶板及地表变形破坏特征,进而得出不同充填方案对采空区的稳固效果。结果表明:随着充填率的提高地表位移值逐渐减小,在充填率在20%~70%之间时,充填效果随充填率的增加提升较明显,总位移最大值与充填率呈近似线性负相关,在充填率小于20%或大于70%时,改变充填率对充填效果的影响较小;间隔式充填能改变地表沉降盆地的形态,在充填量保持一定时,间隔式充填方案地表沉降量更小,充填效果更好;充填沟谷下方采空区比充填山峰下方采空区地表斜坡受采空区影响产生的水平位移更小,斜坡发生失稳的可能性更小。In order to study the influence of different filling schemes on overlying rock and surface deformation under the influence of topographic conditions,according to the mining and geological conditions of Luzigou Coal Mine,many kinds of numerical models of filling schemes considering topographic factors are simulated and analyzed by FLAC^(3D) software,and the deformation and failure characteristics of goaf roof and surface under different filling rates and filling positions are analyzed,and the stable effects of different filling schemes on goaf are obtained.The results show that the surface displacement decreases with the increase of filling rate;when the filling rate is between 20% and 70%,the filling effect increases obviously with the increase of filling rate,and there is an approximate linear negative correlation between the maximum total displacement and the filling rate;when the filling rate is less than 20% or more than 70%,the change of filling rate has little effect on the filling effect;interval filling can change the shape of surface subsidence basin;when the filling volume is kept at a certain amount,the surface settlement of interval filling scheme is smaller and the filling effect is better.The horizontal displacement of the surface slope affected by the goaf under the filling valley is smaller than that under the filling peak,and the possibility of slope instability is less.

关 键 词：沟谷区 采空区 充填率 充填方案 地表变形 

分 类 号：TD823.7[矿业工程—煤矿开采]