煤矿井巷软弱夹层的变形机理初探

THE PRELIMINARY STUDY ON THE DEFORMATION MECHANISM OF WEAK INTERBEDS IN COAL MINE’S TUNNELS

通过对准北诸多煤矿巷道中的软弱夹层的现场观察和室内试验，认为煤矿井巷中软弱夹层的工程特性表现为厚度小，分带性明显，强度低，而夹层矿物成分的不同对巷道工程的危害性差别不大。软弱夹层的变形破坏与其本身的工程特性、地下水的参与、地应力状态的改变密切相关。软弱夹层对巷道锚喷支护十分不利。

By means of field observation of interbeds in many coal mine's tunnels of Huaibei and lab tests, this study indicates that theengineering properties of interbeds are shown as small thickness, obvious zonation and low strength and their varying mineral compositions donot make a great difference in the damages to the engineering of tunnels. The deformation of the interbeds is closely concemed with theirengineering properties, groundwater activities and the change of crust stress state. The weak interbeds are to the disadvantage of the rockbolting shotcrete support.