深部围岩开挖损伤区数值模拟研究

Numerical Simulation of Excavation Damage Zone of Surrounding Rocks in Deep Mining

针对深部围岩体卸荷的特点,引入拉伸应变来描述损伤,得到了岩石损伤弹塑性耦合本构模型,并将其编译为计算软件FLAC的用户自定义本构模型。在此基础上,对深部围岩开挖损伤区进行了数值模拟,分析了围岩和支护的相互作用以及不同支护形式对开挖损伤区的影响,为选择合理的支护形式和施工设计等环节提供参考。

According to the characteristics of unloading of surrounding rocks in mining, tensile strain was used to describe the excavation damage of rock mass. Furthermore a constitutive model on the coupling of damage and elasto - plasticity was obtained and compiled as a user - defined damage model （UDM） of FLAC. Based on these, a numerical simulation of excavation damage of deep rock mass was carried out, the effect of different supporting patterns were analyzed through the simulation of excavation damage zone of the surrounding rocks in deep mining which could provide references for the rational choose of supporting pattern and its construction design.