深部矿井地应力测量方法研究与应用(5)
发布时间:2021-06-07
发布时间:2021-06-07
有意义
第26卷 第5期 康红普,等. 深部矿井地应力测量方法研究与应用 933
差。同时说明,地应力测点数还比较少,需进行更多点的测量。
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4 结 论
(1) 水压致裂法是最直接的地应力测量方法。对环境要求比较宽松,测量应力的空间范围较大,能测量较深处的绝对应力状态,受局部因素的影响较小,不需要套芯等复杂工序,对钻孔设备要求低,成功率较高。采用水压致裂法进行深部矿井地应力测量是可行的。
(2) 根据深部矿井巷道特点开发研制的SYY–56型小孔径水压致裂地应力测量装置,采用小直径钻孔(φ 56 mm),不仅测量钻孔变形小,而且可在井下进行快速地应力测量,为深部矿井提供了有效、快速的地应力测量手段。
(3) 新汶矿区深井地应力测量结果表明:78%的测点最大水平主应力大于垂直主应力;最大水平主应力高达42.1 MPa;最大水平主应力与垂直主应力的比值为1.004~1.550;超千米深井地应力主要以水平应力为主。
(4) 深井水平主应力随深度增加而增大,开采深度越大,水平应力越高。但部分测点的数值离散性较大,表明新汶矿区地质构造非常复杂,从而导致构造应力分布规律性较差。 参考文献(References):
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