摘要
地下采矿是影响斜坡变形的因素之一,采空区的位置影响斜坡变形程度。通过对3个采动斜坡坡体结构和采空区位置进行总结分析,并以永晟煤矿为研究对象,采用颗粒流软件(PFC;)模拟2次开采形成采空区的过程,研究了采空区右侧边界距坡肩不同距离D(向坡内为负)对高陡硬质岩斜坡变形的影响。研究结果表明:采空区覆岩沉降曲线近似“U”型,随着D的增大,沉降范围先不变后扩大,覆岩面向临空面的横向变形更明显,且覆岩受扰动范围逐渐增大;随着第二次开采的进行,陡崖部位岩体迅速变形,D>-50 m时陡崖部位岩体产生的变形远远大于D≤-50 m时产生的变形。研究提出永晟煤矿后续开采应满足D<-50 m,同时为此类高陡硬质岩斜坡下的开采区间提供参考依据。
Underground mining is one of the factors affecting slope deformation, and goaf location affects the degree of such deformation.In this paper, we summarize the structural characteristics of three mining slopes and corresponding goaf location, take the Yongsheng coal mine as the research object, and simulate the formation of the goaf during two times of mining with Particle Flow Code(PFC;) to study the influence of the distance D(negative toward the inside of the slope) from the right boundary of the goaf to the slope shoulder on the deformation of high-steep hard rock slopes.The following observations can be drawn from the results: The settlement curve of the overburden rock in the goaf assumes an approximate “U” shape.The settlement range first remains unchanged and then expands as D increases.The lateral deformation of the overburden rock towards the free face is more obvious, and the disturbed range of the overburden rock gradually increases;as the second time of mining proceeds, the rock body in the steep cliff area rapidly deforms, and its deformation at D>-50 m is much larger than that at D≤-50 m.This study proposes that subsequent mining of the Yongsheng coal mine should meet D<-50 m.It also provides a reference for the mining interval in the case of such high-steep hard rock slopes.
作者
吉岚
赵建军
万勋
李清淼
巫恩歌
JI Lan;ZHAO Jianjun;WAN Xun;LI Qingmiao;WU Enge(State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection,Chengdu University of Technology,Chengdu 610059,China)
出处
《人民珠江》
2022年第3期66-76,共11页
Pearl River
基金
国家自然科学基金(41877273)。
关键词
地下采矿
高陡硬质岩斜坡
颗粒流软件
采空区位置
underground mining
high-steep hard rock slope
Particle Flow Code
goaf location
