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利用水压致裂法和套孔应力解除法对淮南矿区-500～-1 000 m深度范围内的12个矿井进行了地应力测量,取得了19个有效测点的数据。数据分析表明:(1)淮南矿区深部地应力场以水平应力为主,构造应力占绝对优势,属于典型的构造应力场类型;(2)地应力量级属高应力水平;(3)垂直主应力、最大及最小水平主应力随深度的增加均呈增大趋势;(4)侧压系数λ随深度增大而减小,地应力场有从大地动应力场型向准静水压力场型过渡的趋势;(5)侧压比κ的回归曲线分布于Hoek-Brown内外包线带内,且变化趋势与Hoek-Brown曲线相似,但与Hoek-Brown曲线相比,回归曲线κ值偏小;(6)最大水平主应力与最小水平主应力的比值范围为1.12～2.02,其中68.42%的测点分布在1.67～2.02之间;(7)最大水平主应力方位为NEE-EW向。最后探讨了淮南矿区地应力与地质构造的关系,分析认为,矿区最大主应力方向与构造运动密切相关,矿区现今构造应力场最大主应力方位与实测最大水平主应力方位大致吻合。
The stress of 12 mines in the depth range of -500 ~ -1000 m in Huainan mining area was measured by hydraulic fracturing method and stress relief method, and the data of 19 effective measuring points were obtained. The data analysis shows that: (1) The deep geostress field in Huainan mining area is dominated by horizontal stress and the tectonic stress is the absolute dominant tectonic stress field; (2) the geostress is of high stress level; (3) (4) The lateral pressure coefficient λ decreases as the depth increases, and the geostress field transitions from the geostress field to the quasi-hydrostatic pressure field (5) The regression curves of lateral pressure ratio κ are distributed in the Hoek-Brown inner and outer envelopes, and the trend is similar to that of Hoek-Brown curve. However, compared with Hoek-Brown curve, the regression curve κ value is small; (6) The ratio of the maximum horizontal principal stress to the minimum horizontal principal stress ranges from 1.12 to 2.02, with 68.42% of the measuring points distributed between 1.67 and 2.02. (7) The maximum horizontal principal stress orientation is NEE-EW. Finally, the relationship between the geostress and the geological structure in Huainan mining area is discussed. The analysis shows that the direction of the maximum principal stress in the mining area is closely related to the tectonic movement. The maximum principal stress direction of the tectonic stress field in the mining area now agrees well with the measured maximum principal stress direction.