倾斜煤层窄煤柱覆岩裂隙演化规律研究

Study on Fracture Evolution Law of Overlying Strata with Narrow Coal Pillar in Inclined Coal Seam

为了解决窄煤柱矿井覆岩垮落影响瓦斯运移的问题,利用数值模拟软件对不同煤柱宽度下巷道围岩的应力分布情况进行分析,并对不同煤柱宽度下覆岩冒落带、裂隙带、弯曲下沉带高度进行分析,给出了三带随煤柱宽度的变化曲线,同时对矿井覆岩关键层的离层情况进行分析。研究发现:煤柱宽度在10 m以内关键层离层量降低率明显大于煤柱宽度超过10 m时的关键层离层量降低率;明确了窄煤柱留设的合理宽度为10 m。该研究结果为倾斜煤层矿井窄煤柱裂隙带的研究提供了一定的参考与借鉴。

In order to solve the problem of gas migration affected by overburden caving in narrow coal pillar mine,this paper analyzes the stress distribution of surrounding rock of roadway under different coal pillar width by using numerical simulation software,and analyzes the height of overburden caving zone,fracture zone and bending subsidence zone under different coal pillar width,and gives the change curve of three zones with coal pillar width.At the same time,through the analysis of the separation of the key strata in the mine overburden,it is found that the reduction rate of the separation of the key strata within 10 m of the coal pillar is obviously greater than that when the width of the coal pillar exceeds 10 m.Through the analysis,the reasonable width of the narrow coal pillar is 10 m,which provides a certain reference for the study of the narrow coal pillar fracture zone in inclined coal seam.