摘要
为了分析浅埋煤层开采条件下黄土沟谷两侧斜坡的变形破坏机理,基于隆安煤矿深岩沟区域煤层开采地质条件,采用三维数值模拟计算以及理论分析相结合的研究方法,研究了煤层开采后上覆岩土体的应力分布规律、两侧坡体位移分布规律、变形破坏特征以及失稳破坏过程等。结果表明:沟谷两侧斜坡位移以竖直方向为主,水平方向位移均指向采空区中心。斜坡根据变形特征可分为4个变形区:采空区上方一定高度范围内的覆岩冒落塌陷区;采空区中部的松散土体弯曲沉陷区;松散土体弯曲沉陷区和地表移动边界之间的拉裂-倾倒区;地表移动边界之外的未影响区。斜坡的失稳破坏过程可以分为4个阶段:中部沉陷—两侧及后缘拉裂—剪切变形—失稳破坏。研究成果可以为黄土沟谷区域地质灾害评价、采动边坡变形破坏预测以及地表保护提供借鉴。
In order to analyze the deformation and failure mechanism of the slopes on both sides of the loess gully in shallow coal seam mining,based on the geological conditions of the Shenyan gully area in the Longan Coal Mine,3 D numerical simulation and theoretical analysis are used to study the stress distribution law of the overlying rock,the displacement distribution law,the deformation and failure characteristics and the instability failure process of the slope after coal seam mining.The results show that the displacement of the slopes on both sides of the valley is mainly in vertical direction,and the horizontal displacement of the slope points to the center of the goaf.The slope can be divided into four zones according to the deformation characteristics:the overburden collapse area within a certain height above the goaf,the loose soil subsidence area in the middle of the goaf,the pull-dump area between the loose soil subsidence area and the surface moving boundary,the unaffected area outside the surface moving boundary.The instability and deformation process of the slope can be divided into four stages:central subsidence,both sides and trailing edge cracking,shear deformation,and instability failure.The research results can provide reference for the evaluation of geological disasters in the loess valley,the prediction of the deformation and failure of mining slopes,and the surface protection.
作者
刘志辉
吕义清
LIU Zhi-hui;LV Yi-qing(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《煤炭工程》
北大核心
2020年第10期104-108,共5页
Coal Engineering
基金
山西省自然科学基金资助项目(201701D121015)。
关键词
黄土沟谷区
浅埋煤层
应力分布
破坏机理
loess gully area
shallow coal seam
stress distribution
failure mechanism
