基于三维数值分析的大桥磷矿采空区稳定性研究

Stability of goaf of Daqiao phosphorite mine based on 3D numerical analysis

为了得到大桥磷矿采空区与矿山稳定性,采用MIDAS-GTS/NX有限元数值模拟软件,建立了采空区—矿柱—矿山三维力学分析模型,采用非线性静力分析方法对大桥磷矿采空区开展了数值模拟研究。研究结果表明:矿柱剪应力大小与矿柱横截面的大小没有直接的关系,矿柱剪应力的大小与上覆岩层厚度有直接联系。采空区埋深对采空区矿柱的剪应力与矿柱轴向应力均有很大的影响,上部岩体的重力较小,矿柱产生的剪应力与轴向应力较小。矿山没有产生大面积的塑性区分布,矿山稳定性良好。研究结果可以为相似矿山提供参考。

In order to obtain the stability of goaf and mine in Daqiao phosphate mine,a three-dimensional mechanical analysis model of goaf-pillar-mine was established by using MIDAS-GTS/NX finite element numerical simulation software,and the numerical simulation of goaf in Daqiao phosphate mine was conducted by using nonlinear static analysis method.The results indicated that there was no direct relationship between the shear stress of pillar and the cross section of pillar,and the shear stress of pillar was directly related to the thickness of overlying strata.The buried depth of the goaf had a great influence on the shear stress and the axial stress of the pillar in the goaf.The gravity of the upper rock mass was smaller,and the shear stress and the axial stress produced by the pillar were smaller.There was no large area of plastic zone in the mine,and the mine had good stability.The research results can provide reference for similar mines.