空心包体地应力测试方法与工程应用

Hollow Inclusion In-situ Stress Test Method and Engineering Application

为分析回采巷道围岩破碎、变形量大、支护困难的原因，采用三维套孔应力解除地应力测试技术和空心包体应变计，对东周窑矿东翼采区进行现场地应力实测和围压率定实验，并详细阐述了空心包体应力解除法测试地应力的原理、仪器与构造、测试过程等。通过对钻孔应力解除测试结果分析，得到以下地应力分布规律：该矿水平应力为最大主应力、中间主应力，垂直应力为最小主应力；水平主应力与垂直主应力之间的平均比值为1．4～2．2，最大水平主应力方向为北东一南西方向，同南一北方向的夹角约为10°。

To analyze the reason of broken gateway surrounding rock, large deformation and support difficulty, using in - situ stress measurement with 3D trepanning stress - release and the hollow inclusion strainometer, in - situ stress measurement and confining pressure rate experiment was carried out in the east wing of Dongzhouyao Coal Mine. The principle, instrument and structure, and process of the hollow inclusion stress - release method were introduced. The result of borehole stress - relief test shows that, the mine horizontal stress is the maximum principal stress, intermediate principal stress, the vertical stress is the minimum principal stress ; average specific value of the horizontal principal stress and vertical principal stress is within 1. 4 ~ 2. 2, the maximum horizontal principal stress is in northeast- southwest direction, with about 10° intersection angle from the south -north direction.