采动厚湿陷性黄土破坏数值模拟研究

Numerical simulation about the damage of thick collapsible loess by mining

针对厚覆盖湿陷性黄土地表受采动损害的特殊性,在应用FLAC3D模拟计算蒲白矿区白水河下开采煤层地表移动变形中,对黄土层和煤岩体均采用莫尔-库仑准则,及分别采用虎克-布朗和莫尔-库仑两种准则组合的理论计算模型。两种计算结果和实测值比较表明,对黄土采用莫尔-库仑准则,煤岩体采用虎克-布朗准则,地表各种移动变形值误差较小(-12.5%～1.2%);而黄土和煤岩体均采用莫尔-库仑准则,地表各种移动变形值误差相对较大(-31.3%～13.5%)。因此,前一种组合准则理论模型的应用,是提高厚湿陷性黄土覆盖地表损害计算精度的有效方法之一。

According to the particularity of surface damage about thick collapsible loess by mining, During simulating the deformation of the loess about mining under the river of Baishui in Pubai mining area by FLAC^(3D), this thesis apply the Mohr-Coulomb criterion and the Hoek-Brown criterion to the loess and rock, and separately adopt the combination theory calculation model of two criterions to the loss and rock. The comparing result about surface deformation between the numerical simulation and field measure shows that the last method reduces forecast error about surface displacement is -12.5%～1.2% and first method reduces forecast error about surface displacement is -31.3%～13.5%. So applying this combination theory calculation model of two criterions, is an effective method to improve calculation precision of surface damage about thick collapsible loess.