金山店铁矿粉矿围岩变形粘弹性有限元位移反分析

根据金山店铁矿粉矿围岩所具有的瞬时加载时弹性变形和随时间变化蠕变变形趋向收敛的特性，参照现场监测得到的位移 时间曲线，选择Poyting Thomson本构模型，应用有限元位移分析，得到包含粘弹性参数的综合弹性模量E′v(tj,j)，考虑开挖步骤对围岩变形的影响，对综合弹性模量进行回归分离出弹性模量E1,E2,粘性系数η，将这些参数应用到类似粉矿巷道的变形预测中，可以预测该围岩不同时刻的变形量和变形稳定时间。

Finite Element Displacement Back Analysis on Deformation and Viscoelasticity of Surrounding Rock Mass of Jinshandian's Iron Ore and Powder Ore

According to the characteristics of elastic deformation during instantaneous loading and creep deformation tends to convergence changing with time which surrounding rock mass of Jinshandian's iron ore and powder ore have, reference to displacement time curve obtained by field monitoring, chose Poyting Thomson constitutive model, using finite element displacement analysis, integrated elastic modulus which include viscoelastic parameters was obtained, consider affect of excavation steps to surrounding rock mass deformation. Elastic modulus E1, E2, viscosity coefficient η had separated after made regression of integrated elastic modulus, using these parameters into similar deformation prediction of powder ore tunnel, it could predict deformation amount and deformation stability time at different time of this surrounding rock mass.