深部高应力巷道数值模拟本构模型的选择

Selection of Constitutive Model for Numerical Simulation of Deep Roadway with High Stress

通过对深部巷道围岩力学和变形特征的分析,运用弹塑性、应变软化和蠕变3种模型分别模拟高应力下的巷道变形破坏特征,得出蠕变模型的变形量大于其他模型,且受力状态最差。利用华丰煤矿的实测数据验证深部高应力巷道的蠕变变形量远大于掘进时的短期变形量。最后得出深部高应力巷道的模拟应采用蠕变模型。

This paper applied 3 constitutive models including elastic-plastic, strain soften and creep model to simulating deformation and failure characteristic of roadway with high stress by analysis of mechanics and deformation characteristic of surrounding rock of roadway in deep mine. Results showed that deformation calculated from creep model was larger than from other models and stress state from creep model was the worst. Observation data from Huafeng Colliery proved that creep deformation of deep roadway with high stress was far larger than short-time deformation during roadway driving. Therefore, creep model should be selected for simulation of deep roadway with high stress.