摘要
根据陕西某矿区主采煤层覆岩结构及其物理力学性质资料,采用FLAC3D软件中的遍布节理模型研究了覆岩中节理倾角对地表最大下沉值的影响。结果表明:当水平覆岩中有节理发育时,地表最大下沉点偏移沉陷盆地的几何对称点,偏移方向因倾角不同而发生变化;节理改变了最大主应力的分布状况,拉、压应力随着节理倾角的变化出现沿节理面或垂直节理面分布的特征;低角度节理和高角度节理对地表下沉有较大的影响。
The relation between the joint dip angle and the maximum subsidence of the ground surface was studied by using ubiquitous joint model involving in the FLAC3D numerical software according to the overburden structure and its physico-mechanical properties of the main seam in a mining area in Shanxi Province. The results show that when joints developed in the horizontal overburdens, the position of maximum subsidence point in the ground surface had a migration comparing to the geometrically symmetrical points of the subsidence basin, and the direction of migration varied with the joint dip angle; the maximum principal stress distribution was also changed, and the tensional stress and compressive stress showed the distribution characteristics in the tangential or normal direction of the joints as the dip angle changed; the low or high joint dip angle had a greater influence on the surface subsidence than others.
出处
《矿业安全与环保》
北大核心
2008年第6期1-3,6,共4页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(40472104)
