寺河煤矿二号井切顶卸压沿空留巷技术应用研究

为解决寺河煤矿二号井97盘区采掘接替紧张等问题,在97307工作面采用切顶卸压沿空留巷技术.在介绍切顶卸压沿空留巷技术原理、施工工艺流程的基础上,结合该工作面生产地质条件,给出恒阻大变形锚索支护参数;结合工程实践、理论计算等,得出顶板切缝高度8.0m、切顶角度80°、孔间距500 mm、单孔装药量3.0 kg、四孔爆破...

Application of Roof-Cutting and Pressure-Releasing in Gob-Side Entry Retaining of No.2 Well in Sihe Mine

In order to solve the tight replacement of mining and excavation in the 97th panel of No.2 Well in Sihe Mine,the technology of roof-cutting and pressure-releasingin gob-side entry retaining was adopted on No.97307 working face.Based on the principle of the roof-cutting and pressure-releasing and its construction process,combined with the geological conditions of the working face,the parameters of constant resistance and large deformation anchor cable support were given.In addition,with engineering practice and theoretical calculations,some key cumulative blasting parameters were obtained,including roof-cutting height of 8.0 m,roof-cutting angle of 80°,hole spacing of 500 mm,single hole charge of 3.0 kg,and four holes blasting with one hole apart.The on-site mine pressure monitoring results showed that,after lagging the working face by 150 m,the surrounding rock was basically stable and the deformation was small,which could meet the normal operation of the next working face.The research could provide a reference for similar conditions.