摘要
为了研究过逆坡向断层开采时诱发采煤斜坡发生滑坡的动态变化过程,选取风峁顶采煤斜坡为例,采用PFC~(2D)软件模拟了在过逆坡向断层开采时采煤斜坡的变形趋势、应力特征、裂隙演化及滑坡形成过程。研究表明:上盘采空后,应力集中沿断层发育,上盘岩体发生差异性沉降,下盘岩体向临空面外侧挤出隆起并对上盘岩体具有支撑作用。黄土覆盖层中部和后缘产生竖向拉裂缝,黄土覆盖层底部产生水平剪裂缝。下盘开采时,下盘岩体内部形成拱形承载结构,随着工作面的不断推进,拱形承载结构向斜坡外侧不断扩大,且下盘对上盘岩体的支撑减弱。当拱型承载结构失效,断层处应力集中消散,下盘岩体整体垮落,上盘岩体向下盘采空区方向倾倒,引发典型的崩塌滑坡。
In order to study the dynamic change process of coal mining slope landslide induced by overthrust slope fault mining,took Fengmao crest coal mining slope as an example,and simulated the deformation trend,stress characteristics,fracture evolution and landslide formation process of coal mining slope in overthrust slope fault mining based on PFC2D software.The results show that the stress concentration develops along the fault,the different subsidence occurs in the hanging wall rock mass,and the footwall rock mass extrudes to the outside of the caving surface.Vertical tensile cracks were found at the middle and posterior edges of loess overburden,and horizontal shear cracks were found at the bottom of loess overburden.During footwall mining,an arch bearing structure is formed inside the footwall rock mass.With the continuous advance of the working face,the arch bearing structure expands to the outside of the slope,and the support to the hanging wall rock mass is weakened.When the arch bearing structure disappears and the stress concentration at the fault layer dissipates,the footwall rock mass collapses as a whole,and the hanging wall rock mass dumps toward the footwall goaf,leading to a typical collapse landslide.
作者
白霖
吕义清
陈强
BAI Lin;LYU Yiqing;CHEN Qiang(School of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《煤炭技术》
CAS
北大核心
2023年第5期154-158,共5页
Coal Technology
