深部软弱围岩流变应力恢复法地应力测量技术及应用

Application of rheological stress recovery method for in situ stress measurement in deep coal mine

简述了深部软弱围岩流变应力恢复法(RSR法)地应力测试的原理、测试仪器及测试过程,并给出了该方法在平煤一矿测点约877m处的三维地应力状态实测数据。测量结果显示:三个主应力中,最大主应力和最小主应力近于水平,中间主应力近于垂直,属于水平构造应力场类型;最大主应力方向近于NW—SE方向,与平顶山地区近期的构造运动历史相一致。该方法测得的结果与应力解除法的测量结果相吻合;实测表明流变应力恢复法具有较大的使用价值,特别在深部软弱破碎的复杂地质条件下,在传统地应力测试方法难以实施时,该方法仍能顺利实现,适应性较强。

In this paper,the basic principles,calculation equations and related procedures of rheological stress recovery（ RSR） method are introduced. The RSR method and overcoring technique are carried out to measure the in situ stresses at a depth of 877 m in Pingdingshan No. 1 coal mine. Three principal stress magnitudes and directions are determined. The maximum and minimum principal stresses are nearly horizontal,and the middle principal stress is nearly vertical. The stress measurement results of RSR method and overcoring technique are basically in the same order, and the major principal stresses are approximately in the direction of NW- SE, which correlates well with the stress regime of Pingdingshan zone known from the tectonic movement history. The application example shows that RSR method is suitable for in situ stress measurement. Especially in complex geology conditions at great depth,conventional methods can hardly be implemented,while RSR method can measure reliable in situ stresses with good adaptability.