工作面膨胀致裂切顶技术应用研究

Research on the Application of Expansion Induced Cracking and Roof Cutting Technology in Working Face

为了解决大面积悬顶难垮难落造成支护困难的问题,对膨胀致裂进行研究,首先利用数值模拟软件对膨胀致裂切顶卸压可行性进行研究,发现经过切顶卸压后顶板垮落情况得到明显加强,同时根据实际地质情况,设计了膨胀致裂切顶卸压技术方案,经过对胀致裂切顶技术方案进行工业化验证,发现膨胀致裂切顶后支撑压力在7 h后出现明显的下降趋势,支撑压力值从26 MPa快速降低至16 MPa,下降效果明显,切顶方案可行,为矿井安全开采做出一参考。

In order to solve the problem of support difficulties caused by the difficulty of collapse and falling of large-area suspended roofs,the study of expansion induced cracking was conducted.Firstly,numerical simulation software was used to study the feasibility of expansion induced cracking and roof cutting pressure relief.It was found that the roof collapse situation was significantly strengthened after roof cutting pressure relief.At the same time,based on the actual geological situation,an expansion induced cracking and roof cutting pressure relief technology scheme was designed.After industrial verification of the expansion induced cracking and roof cutting technology scheme,it was found that the support pressure after expansion induced cracking and roof cutting showed a significant downward trend after 7 hours,with the support pressure value rapidly decreasing from 26 MPa to 16 MPa.The decrease effect was significant,and the roof cutting plan was feasible,providing a reference for safe mining in mines.