地应力测量非弹性应变恢复法在某金属矿的应用

为获得某金属矿深部岩体地应力分布特征，采用非弹性应变恢复法，选取该矿同一勘探线附近距地表埋深615 m、665 m、715 m三个水平进行现场地应力测量。通过分析3个水平各测点地应力测量结果，得到该矿区地应力分布规律。该矿区最大主应力和最小主应力均为近水平主应力，中间主应力为近垂向的应力；3个水平的最大水平主应力方向基本一致，方位角为101°～130°。主应力的大小随深度呈线性增长。近水平应力大于近垂向应力，表明该矿浅部地壳应力占主导地位的是水平构造应力。两个相邻样品的非弹性应变恢复法地应力测量值平均差系数最大为8.33%,表明其结果具有较好的一致性，验证了非弹性应变恢复法的可靠性。

Application of Anelastic Strain Recovery In-Situ Stress Measurement Technology in a Metal Mine

To obtain the characteristics of in situ stress distribution of deep rock masses in a metal mine, the anelastic strain recovery method was employed to investigate the in situ stress of three levels near the same exploration line at depths of 615 m, 665 m, and 715 m. By analyzing the measurements, the distribution pattern of in situ stress in this metal mine was determined. The maximum and minimum principal stresses in the mine are close to the horizon, while the middle principal stress is close to the verticality; the direction of the maximum horizontal principal stresses in the three levels is essentially the same, with azimuth angles ranging from 101° to 130°. With increasing the depth, the magnitude of the primary stress increases linearly. The near-horizontal stress is greater than the near-vertical stress, indicating that the dominant crustal stress in the shallow part of the mine is the horizontal tectonic stress. The average difference coefficient of the anelastic strain recovery method for the two adjacent samples is 8.33%, which indicates that the results are in good agreement and verifies the reliability of the anelastic strain recovery method.