摘要
煤层开采随着工作面的推进,覆岩变形引起上部土体的变形和移动,上部土体的应力路径随之改变。使用弹塑性有限元方法分析了煤层开采其土体应力变化的特征,进行不同的应力路径分区,通过对六个代表性的分区分析得到:两侧煤柱上方土体的应力路径变化的区域基本在K0线以上,处于压缩变形状态;采空区上方土体的应力路径变化的区域则在K0线以下,且在某些部位可能位于p轴以下,处于拉伸状态。
While the coal face go forward during coal mining, the deformation of cover rock can induce deformation and remotion of soil above it .Then the stress path of the soil above it will change . By using the finite element method of elastoplastic, this thesis analyses the variation of stress in soil during coal and devide the different stress path part into six. According to the analysis of the six representational districts. The stress path district on the both sides of coal pillar is above the K0 line . and the soil is in the state of being compressed. The stress path district above below the K0 line, even below the p axis, and the soil is in the state of tensile.
出处
《能源技术与管理》
2008年第6期31-33,共3页
Energy Technology and Management
关键词
煤层开采
有限单元法
应力路径
coal mining
finite element method
stress path gob is
