阿尔哈达铅锌矿深部地应力分布特征及其应用

In-Situ Stress Distribution Characteristics in A’Erhada Lead-Zinc Mine and its Application

阿尔哈达矿区随着开采深度加大,地应力环境复杂,围岩变形破坏严重。为了保障后续工作的顺利开展,采用应力解除法对矿区5个水平中段共5个测点进行了地应力测量,并以地应力场模型为基础,分析矿区地应力的空间分布及应力场与地质构造的关系。研究结果表明:地应力场的最大主应力和中间主应力接近于水平方向,最小主应力接近于竖直方向;实测最大水平主应力与垂直应力的比值为1.20~1.40,水平应力为主导地应力,最大主应力的平均方位角为267°。在盘区采场开采过程中,围岩应力向外部转移,采场顶部以及采场联巷与溜井交会部位应力最为集中;在最大主应力作用下,阿尔哈达矿区NE向断裂构造呈现出压扭性特征,实测最大主应力方向与区域构造应力场的方向相同。

With the increase of mining depth in A’Erhada mining area, the in-situ stress environment is complex and the surrounding rock deformation and damage is serious. In order to ensure the development of the follow-up work, the stress release method was used to measure the in-situ stress at five measuring points in five horizontal middle sections of the mining area. Based on the in-situ stress field model, the spatial distribution of the in-situ stress was analyzed, as well as the relationship between the stress field and the geological structure in the mining area. The results are concluded as follows. Firstly, the maximum principal stress and the middle principal stress are close to the horizontal direction, and the minimum principal stress is close to the vertical direction. Secondly, the ratio of the measured maximum horizontal principal stress to the vertical stress is 1.20~1.40, the horizontal stress is the dominant in-situ stress, and the average azimuth of the maximum principal stress is 267°. Thirdly, in the mining process of panel stope, the stress of surrounding rock is transferred to the outside, and the stress at the top of stope and the intersection of stope joint roadway with orepass is the most concentrated. Fourthly, under the action of the maximum principal stress, the fault structure at NE direction in A’Erhada mining area presents the characteristics of compression and torsion. The measured direction of the maximum principal stress is the same as the direction of the regional tectonic stress field.