Research on support technology of mining roadway under different layer spacing of extremely close coal seam groups
In view of the problems such as serious local roof damage and crack development caused by the continuous change of layer spacing during the track roadway of No.4201 working face under goaf of extremely close coal seam group in Gaojiazhuang Coal Mine,the maximum failure depth of floor and the variation rule of layer spacing were studied by theoretical calculation and field measurement.The roof layer spacing was divided into three support zones less than 2.8 m,2.8～3.8 m and larger than 3.8 m,and three support schemes were developed respectively,such as I-beam shed+bolt support,short cable mesh support and long and short cable mesh sup-port.The field application results show that the roof integrity of No.4201 track tunnel is improved and the deformation of surrounding rock is less than 100 mm,which meets the application requirements.
extremely close coal seamfloor failure depthdifferent layer spacingzone support
万方数据
维普
