基于实测应力的回撤通道顶板断裂位置确定方法

Determination Method for Roof Fracture Position in Retracement Channel Based on Measured Stress

为确定综采工作面在末采阶段顶板断裂位置对回撤通道的影响程度,根据工作面贯通后顶板的不同断裂形式,基于弹性力学理论建立回撤通道顶板结构力学模型,对顶板断裂位置与贯通后回撤通道保护煤柱侧帮部应力关系进行了分析,得到了不同顶板断裂位置下回撤通道煤柱帮竖向应力计算公式。最后,根据红柳林煤矿综采工作面回撤通道保护煤柱应力测试结果,对15205和15206工作面回撤通道的顶板断裂位置进行了判断。

In order to determine the influence level of roof fracture position at the ending stage of fully-mechanized face on retracement channel, based on the different fracture forms of roof after the cut-through of woking face, we established the roof structure mechanical model of retracement channel by theory of elastic mechanics. We analyzed the stress relationship of roof fracture position and pillar side of protective pillar in retracement channel after the cut-through of working face, obtained the ver tical stress calculation formula of pillar side under different roof fracture positions. According to the protective coal pillar stress test results in 15205 and 15206 fully-mechanized faces retracement channel of Hongliulin Coal Mine, combined with the stress calculation formula, we determined the roof fracture position of retracement channel.