不同切槽参数对围岩稳定性分析

为了分析切槽深度和宽度对巷道围岩变形的影响和确定最佳的底板切槽参数,通过理论分析底板破坏的特征和相应的支护措施;采用FLAC 3D模拟了在不同切槽条件下巷道围岩变形的影响规律;研究了在不同切槽参数条件下巷道围岩的变形情况。结果表明,底板岩层强度不同时应当采取不同的支护措施,底板岩层强度较低时适宜采用加固法,强度较高时采用卸压法。当采用底板切槽来降低巷道围岩变形量时,在底鼓量逐渐减少时顶板下沉量也在急剧增加,并且顶板下沉量要大于底鼓的减少量。因此采用切槽卸压降低底鼓量的方法适用于顶板比较稳定的岩层,在底板中部切槽的效果要优于在两底角切槽,切槽深度为巷道宽度一半时,巷道稳定性最好。

Analysis on influence of different groove parameters to surrounding rock stability

In order to analyze the effect of groove depth and width on the deformation of roadway surrounding rock and determine the optimal groove parameters,the theoretical analysis was conducted on the floor deformation fea-tures and corresponding support measures,and the numerical simulation software FLAC 3D was applied to simulate the influence laws of roadway surrounding rock deformation under different groove parameters,and the surrounding rock deformation of roadway in this condition was studied. The results showed that different support measures should be taken when confronting different intensities of groove rock seam. When the intensity of floor rock seam is lower, the strengthening method is suitable,and when the intensity of floor rock seam is higher,the stress relief method is suitable. When using the method of floor grooving to decrease the deformation of roadway surrounding rock,the set-tlement of roof increases rapidly with the gradual decrease of floor heave,and the settlement of roof is bigger than the decrease of floor heave. The method of applying grooving stress relief to decrease the floor heave is suitable for the rock seam with better roof stability. The effect of grooving in middle of floor is better than that in base angle. The stability of roadway is the best when the cutting depth is half of the roadway width.