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溜井围岩现存应力状态对于溜井稳定性分析具有重要意义。为准确判断溜井围岩安全稳定情况,在室内岩石力学试验结果和岩石质量评价RMR值的基础上,通过折减计算获得相关岩体参数。采用空区激光探测系统(CMS)探测获取了溜井的三维实体模型。参照已获得的矿区原岩应力参数,运用SURPAC和FLAC3D复杂地质体建模技术建立了矿区和溜井围岩三维数值分析模型,使用模型重构的方法获取了溜井围岩稳定性分析的原岩地应力参数,基于多元回归方法精确反演出溜井围岩的现存应力状态。结果表明:1)溜井围岩在标高为-292~-264 m时,溜井受矿石冲击的区域变形严重,存在失稳的风险,需加强监测;2)溜井围岩最大拉应力出现在标高为-278.12 m附近,其值为1.58 MPa,超过了岩体最大抗拉强度;溜井围岩最大位移出现在标高为-281.74 m附近,其值为13.8 cm,在标高为-292~-264 m时,产生了较大的塑性破坏。
The existing stress state of the surrounding rock of the chute is of great significance to the stability analysis of the runway. In order to accurately judge the safety and stability of the surrounding rock, the parameters of the relevant rock mass are obtained through the reduction calculation based on the indoor rock mechanics test results and the rock mass evaluation RMR value. A three-dimensional solid model of the runway was obtained by using the space laser detection system (CMS). With reference to the parameters of the original rock stress in the mining area, the three-dimensional numerical analysis model of the surrounding rock of the mining area and the slip-shaft is established by using the complex geological body modeling techniques of SURPAC and FLAC3D. The original rock stress of the rock-surrounding stability analysis is obtained by using the model reconstruction method Parameters, based on multiple regression method accurate inversion of the existing state of the surrounding rock stress state. The results show as follows: 1) When the elevation of the surrounding rock of the chute is from -292 to -264 m, the area of the slip well affected by the ore is seriously deformed with the risk of instability, so monitoring should be strengthened.2) The maximum tensile stress of the surrounding rock of the chute is at the level of -278.12 m, the value of which is 1.58 MPa, which exceeds the maximum tensile strength of rock mass. The maximum displacement of the surrounding rock appears at a height of -281.74 m with a value of 13.8 cm. When the elevation is -292 -264 m , Resulting in a greater plastic damage.