基于蠕变损伤耦合的海底开采点柱稳定性分析

 针对海底金属矿开采过程中采场留设点柱的稳定性问题,采用损伤统计本构理论,在西原模型的基础上提出一种参数获取相对简单的三维非线性蠕变损伤模型,并给出由稳态蠕变向加速蠕变过渡的判定方法.利用ANASYS 数值软件分析了三山岛金矿新立矿区海底点柱式充填采矿法矿房的应力分布,并应用三维非线性蠕变损伤模型对点柱稳定性进行了黏弹塑性损伤分析和渗流分析.该模型充分考虑了岩石的基本力学参数和工程地质调查结果,可推广至其他流变物理模型,对于大型岩土工程的蠕变渗流分析具有较强的适应性.

Stability analysis of pillar in undersea mining based on creep-damage coupling

Reservation pillar can control the deformation and the movement of the rock strata in seabed metal mining. But the deformation of pillar is greatly influenced by stress distribution and mining time. Maintaining the stability of pillar under long-term stress and seepage action is directly related to the safety of seabed mining. In order to study the stability of under-sea point pillar stope under long-term stress and seepage action, a new nonlinear creep constitutive model and a damage evolution equation are proposed based on statistical damage theory and Nishihara model. Meanwhile, a judgment method for transition from primary creep to accelerated creep stages is suggested. ANASYS is used to calculate the stress distribution of the stope. On this basis, the model is then applied to analysis of the viscosity-elastic-plastic damage and seepage property of an under-sea point pillar in Xinli district of Sanshandao gold mine. The result shows that the structure of the stope is stable. In the coming design of mine stopping, the number of pillars can be appropriately decreased so that the loss rate of ore will be reduced. The model gives enough thought to the mechanics paramater of rock mass as well as the result of engineering geological survey, so that it can be extended to other rheology models. It is also adapative to other large-scale rock engineering and has a rather high application value.