狮子山铜矿深部开采三维地应力实测及应力场分布研究

Study on 3D in-situ stress measurement and distribution of stress fields in deep mining of Shizishan Copper Mine

狮子山铜矿已进入深部开采阶段,针对深部巷道破坏严重、岩层移动加剧的现象,采用空心包体应力解除法对该矿进行三维地应力测量,共获取四个不同中段测点的三维地应力测试数据。地应力实测结果表明,四个中段测点的最大、最小主应力基本呈线性变化,最大主应力为45.59 MPa,随深度增加而增加,倾角变化范围为-8.68°～6.15°。最大水平主应力与垂直主应力的比值变化范围为1.41～2.75,说明矿区地应力以水平构造应力为主,剪应力值相对较大。九中段、十一中段、十二中段的最大主应力方向与矿体走向基本一致,而十五中段最大水平主应力方向与矿体走向近似垂直,地应力场的分布特征与工程地质调查和巷道变形调查结果相吻合。

Shizishan Copper Mine goes into the deep mining. As the seriously deep roadway damage and in- creasing strata movement, the hollow inclusion gauge method was adopted to measure the three dimensional in-situ stress and obtained the test data from four different levels. The measured results show that the maximum and mini- mum principal stress varies linearly, the maximum principal stress increases with the depth and the maximum value is 45.59 MPa, and its range of inclination is -8.68°-6.15°. The ratio range of the maximum horizontal principal stress and the vertical principal stress is 1.41-2.75, which points out that the main in-situ stress is horizontal tec- tonic stress and the shear stress values are relatively large in this mining area. The direction of maximum principal stress in number nine, eleven and twelve level is basically coincident with the orebody trend, however, that of the maximum horizontal principal stress in number fifteen level is approximately vertical to the orebody trend. Distribu- tion characteristics of in-situ stress fields are in accordance with the survey results of engineering geological investi- gation and roadway deformation.