摘要
综放面前方煤体出现应力重新分布,产生支承压力,导致煤壁片帮。研究根据煤壁前方煤体的变形特点,将其划分为破碎区、塑性区及弹性区,其变形过程划分为塑性流动(残余变形阶段)、塑性变形、弹性变形3个阶段,并给出了各阶段煤体强度的本构关系。在此基础上运用极限平衡理论,推导出煤壁破碎区宽度的理论计算公式,理论分析了煤壁片帮的机理,结合工作面实际情况,提出预防和治理煤壁片帮的措施。理论指导实践,取得了良好的控制效果,减少了片帮量。
Surrounding rock stress would redistribute reflected by mining height of fully mechanized caving face, and is too concentrate to rib spalling of coal face. Basis on characteristics of coal before coal wall, we divide it into three areas, crushing areas, plastic areas, elastic area, the corresponding deforming process is plastic flow, plastic deformation, elastic deformation. We deduce the formula about the width of crushing area on the strike longwall by limit equilibrium, and analyze the mechanism of rib wall. We provide measures to deal with rib fall combined with the actual situation. Theory guiding practice, achieve good effect, and decrease the degree of rib spalling.
出处
《煤炭科技》
2009年第2期44-47,共4页
Coal Science & Technology Magazine
关键词
综放面
片帮
极限平衡理论
fully mechanized caving face
rib spalling of coal face
limit equilibrium theory
