注浆加固工作面底板突水“孔隙-裂隙升降型”力学模型

“Pore-fractured lifting type” mechanical model for floor water inrush of the grouting enforcement working face

运用孔隙裂隙弹性体理论,结合损伤力学、断裂力学和矿山压力理论,以动态变化的分析思想和实测资料,研究了注浆及采动对岩体孔隙-裂隙类型升降变化的影响;注浆加固使工作面底板岩体类型由导水的IV,III型转为不导水的II,I型;采动则使工作面底板岩体类型在局部地点由不导水的II,I型转换为导水的IV,III型,从而形成"垂直、小范围"的导水通道;构建了注浆加固工作面底板突水"孔隙-裂隙升降型"力学模型.

Based on field data and the kinetic ideology, the influence of grouting and mining on the alteration of strata pore-fracture types was studied by introducing pore-fractured elasticity theory, combined with damage mechanics, fracture mechanics and underground strata pressure theory. Floor rock types changed from aquifer type IV and III to type II and I without water conductivity after grouting enforcement. Whilst floor rock types change from aquifer type II and I to aquifer type IV and III with water conductivity after mining, and therefore a vertical and localised region underground water flow channel could be formed. As a result ＂pore-frac- tured lifting type＂ mechanical model of floor water inrush of the grouting enforcement working face was established.