卸压开采顶板巷道破坏特征及稳定性分析

Deformation characteristics and stability analysis of roof roadway in destressed mining

通过物理模拟实验显示上行卸压开采顶板岩层运动状况,分析了不同区域顶板巷道的采动破坏特征;利用长距离钻孔跟踪探测桃园煤矿上行开采顶板岩体的裂隙发育过程,得到了顶板不同区域巷道围岩的裂隙分区特征,并推断出该特定条件下上覆岩层采动稳定周期为165 d;采用FLAC软件进一步研究了不同侧压系数和采动应力环境下的顶板巷道的椭圆形断面形状,指出底板必要的加固深度为4.0～6.0 m,明确了卸压区顶板巷道维护的基本原则和控制方法。

First zoning deformation characteristics of roof roadway were analyzed by physically simulating roof strata movement.Then zoning fracture distribution of surrounding rock subject to mining activities was tracked by drilling in-situ long-distance boreholes in Taoyuan Coal Mine.A 165-day stabilization period of the overlying strata was also concluded according to the field test results.Lastly the optimum section shape of the roadway and 4.0~6.0 m effective enhancing depth of the floor under different lateral pressure coefficients and varying mining-induced stress conditions were evolved by adopting commercial FLAC codes.These provide fundamental principles and methods for roof roadway support in destressed zones.