摘要
露天矿边坡稳定是煤矿工程安全生产的主要问题之一。采用内排压脚和削坡减重措施对增强边坡稳定作用较大,有利于现场开采安全。以安家岭露天矿29209工作面为研究对象,采用相似材料模型和数值模拟相结合的方法,研究内排及削坡对露天矿边坡稳定性的影响。研究结果表明,上覆岩层的垮落和变形形成的"拱式"结构使得岩体向边坡临空面方向发生水平移动,造成边坡岩体的开裂,甚至形成滑移面或潜在滑移面;随工作面的推进,地表形成W型沉陷形状,沉陷区域波及到坡面位置,累计沉降值达到2m左右;内排和削坡措施可有效减小边坡沿煤层上下面的错动;边坡的变形破坏以层间错动为主,同时伴有朝向采空区的塌陷;当工作面推进超过设计停采线50m时,垂直方向裂隙带下沉,1360平盘向边坡临空面水平推移约3m,形成典型"推移式"滑坡模式。
Open pit slope stability is one of the main problems for coal mine safe production. Both measures of internal dumping presser foot and slope cutting weight loss play important role for enhancing slope stability, which is conducive to on-site mining safety. Taking No. 29209 working surface at Anjialing open pit mine as object of study, the influence of internal dumping presser foot and slope cutting on open pit slope stability was investigated based on a combined method of numerical simulation and similar experiment. Results show that the ＂arch＂ structure caused by the collapse and deformation of overburden strata may make the horizontal movement of rock mass towards the slope free surface and the crack of slope rock mass even form the slip surface or potential slip surface; with the working surface advancing, the ground surface presents W-type settlement; subsidence area may spread to the slope position, and the cumulative settlement value is about 2m. Both internal dumping presser foot and slope cutting can effectively reduce the slope dislocation along upper and bottom coal seam. The inter-layer dislocation is the main form of slope deformation damage accompanied by mining subsidence towards an empty area. When the working surface exceeds designed stop line 50m, vertical fractured zone is sinking, 1360 flat plate moves towards slope free surface about 3m, then a typical ＂elapsed＂ landslide mode is formed.
出处
《实验力学》
CSCD
北大核心
2014年第2期163-171,共9页
Journal of Experimental Mechanics
基金
国家自然科学基金项目(51274122)
关键词
内排压脚
露天边坡
稳定性
相似实验
数值模拟
internal dumping presser foot
open pit slope
stability
similar experiment
numerical simulation
