覆岩离层形成的力学判据研究

Research on mechanical criterion of formation of separation layer in cover rock

采区上覆岩层离层注浆是控制开采沉陷的重要技术,离层的形成和位置判别对正确实施离层注浆具有重要意义。分析认为,可注浆离层的产生需满足3个条件:弱面剪切破坏、岩层完整性和岩层组的岩性差异性条件。利用这3个条件和莫尔.库仑破坏准则,建立了完整的采区上覆岩层离层形成的力学判据。结合采区上方应力计算的解析解或数值方法可以准确地、方便地确定离层是否产生及产生位置。

In the mining area,separation layer grouting is an important technology to control the settlement,the formation and situation of separation layer is significant to exert separation layer grouting.The formation of separation layer grout needs three conditions:weaker plane shear failure,terrane integrality and lithology otherness.The criterion of separation layer formation is established from the proceeding conditions and Mohr-Coulomb criterition.The study shows that the formation and situation of separation layer is confirmed by analytic solution or numerical solution.