岩层移动模拟研究中模型下边界位置的确定

基于“下三带”理论和采场端部岩体破坏区理论,采用UDEC数值模拟计算,对岩层移动模拟研究中如何确定模型下边界范围进行了研究。研究结果表明,模型下边界位置应取在底板导水破坏带以下或采场底板最大破坏深度以下,若取在离底板较近处,将导致老顶上方应力集中程度偏高、底板垂直应力总体偏大、采空区底板不规则运动和实体煤层底板垂直位移值偏小。

Ascertain model nether boundary problem in physical and numerical simulation of strata movement

Based on the theory of "nether three zones" and rock fractured zone near the margin of the working place,how to ascertain the models nether boundary in numerical simulation of strata movement were studied through numerical simulation calculations using software UDEC.The results show that model nether boundary should be put below water conducted zone of floor or below the most breaking depth of floor;if put it near the floor,it will lead to the centralized stress on main roof and vertical stress in the floor bigger than actual,anomalistic movement of gob floor and vertical displacement of floor less than actual.