水力压裂基本顶沿空留巷顶板变形特征研究

摘 要：为探究水力压裂基本顶沿空留巷对巷道顶板及巷旁支护体顶部变形的影响，本文以榆家梁矿43308运输顺槽沿空留巷水力压裂基本顶工程为背景，采用FLAC3D数值模拟方法对水力压力前后沿空留巷顶板与巷旁支护体顶部的变形特征进行了分析，结果表明：沿空留巷顶板下沉量呈现由煤壁处向支护体处逐渐增大的趋势，巷旁支护体顶部变形量呈现由沿空留巷处向采空区处逐渐增大的趋势，均呈现“倾斜”特征。水力压裂基本顶前后，沿空留巷顶板平均下沉量由10.7 mm减小到7.23 mm，而巷旁支护体顶部平均变形量由16.82 mm减小到9.13 mm，沿空留巷顶板下沉量与巷旁支护体顶部变形量分别降低32.43%和45.72%。现场实测结果显示，水力压裂基本顶沿空留巷的巷道顶板下沉量与巷旁支护体顶部变形分别维持在20 mm~25 mm和60 mm~65 mm之间。水力压裂基本顶沿空留巷技术在榆家梁矿的成功应用，为其他类似矿井或工作面提供了一定的借鉴意义。

Study on characteristics of roof deformation of gob-side entry with hydraulic fracturing of main roof

Abstract: In order to explore the deformation characteristics of the roof of the gob-side entry and the top position of the roadside backfill body with hydraulic fracturing main roof, FLAC3D numerical simulation method was used to simulate the deformation characteristics of gob-side entry and roadside backfill body before and after hydraulic pressure based on the main roof hydraulic fracturing project of 43308 transportations in Yujialiang coal mine. The results show that: the roof deformation of gob-side entry increases gradually from the coal wall to the roadside backfilling body, and the deformation at the top of roadside backfilling body also increases gradually from gob-side entry to gob. After main roof hydraulic fracturing, the average roof deformation of gob-side entry decreases from 10.7 mm to 7.23 mm, and the average deformation at the top of the roadside backfilling body decreases from 16.82 mm to 9.13 mm. The deformation of roof of gob side entry and at the top of the roadside backfilling body both decrease obviously. The field measurement results showed that the deforamtion of the roof of the gob-side entry and the top position of the roadside backfilling body were maintained between 20 mm ~ 25 mm and 60 mm ~ 65 mm, respectively. The successful application of hydraulic fracturing basic roof gob side entry retaining technology in Yujialiang mine providew a certain reference for other similar mines or working faces.