山区沟谷地形采动覆岩移动变形数值模拟

Numerical Simulation of Movement and Deformation of Mining overburden in Mountain Valley Topography

针对山区沟谷地形条件下的开采沉陷问题,以山西宏盛煤矿为工程背景,采用UDEC数值模拟软件建立了沟谷地形条件下采动过程中覆岩与地表移动变形数值模型,重点分析了采动过程中覆岩与地表的力学损伤状态及位移变化.研究表明:采动程度对覆岩与地表的损伤状态具有重要影响,即采动程度越大,处于塑性破坏区的覆岩范围越大;沟谷地形地面坡度产生的附加水平移动对冲是形成谷底地表隆起的主要原因.

Aiming at the problem of mining subsidence under the condition of gully topography in the mountainous area,a numerical model of overburden and surface movement and deformation in mining process under the condition of gully topography is established by using UDEC numerical simulation software,taking a mine in Shanxi Province as the engineering background.The damage state of mechanics and displacement change of overburden and surface during mining are analyzed.The study shows that the extent of mining has an important effect on the damage state of overburden and surface,that is,the larger the mining degree is,the larger the overburden in the plastic failure zone is.The main reason for the surface uplift of valley bottom is the additional horizontal movement hedge caused by the slope of valley topography.