某硬石膏矿地下开采长期稳定性研究

Study on Long-term Stability of Underground Mining in an Anhydrite Mine

为了研究某硬石膏矿长期稳定性,通过构建矿山开采模型,采用Burgers蠕变本构模型,对矿山开采全过程进行数值模拟分析。结果显示,随着采空区存续时间变长,各中段采空区水平位移差和垂直位移越来越大,增加幅度逐渐减少,围岩变形趋于稳定。石膏矿模拟开采后100 a内的最大主应力值为21.7 MPa,采场围岩最大垂直位移为35~40 mm,最大Y向水平位移量为36 mm,最大X向水平位移量为26 mm,均处于允许强度和变形范围内。该石膏矿采场围岩长期稳定性较好,为类似石膏矿山长期稳定性分析提供了可供参考的案例。

In order to study the long-term stability of an anhydrite mine,the whole process of mining is numerically simulated and analyzed by constructing a mining model and using Burgers creep constitutive model.The results show that as the duration of the goaf becomes longer,the horizontal displacement differ ence and vertical displacement of the goaf in each middle section become larger and larger,the increase range gradually decreases,and the deformation of the surrounding rock tends to be stable.The maximum principal stress value of gypsum mine within 100 years after simulated mining is 21.7 MPa,the maximum vertical displacement of surrounding rock is 35~40 mm,the maximum horizontal displacement in Y direc tion is 36 mm,and the maximum horizontal displacement in X direction is 26 mm,which are all within the allowable strength and deformation range.The long-term stability of the surrounding rock of the gypsum mine is good,which provides a reference case for the long-term stability analysis of similar gypsum mines.