开挖卸荷条件下深部圆形洞室各向同性围岩分区破裂化机理

论文提出了一种静水压力条件下动态开挖卸荷对深埋圆形洞室各向同性围岩分区破裂化影响的力学模型,获得了动态开挖卸荷条件下深埋圆形洞室围岩的弹性应力场,确定了卸荷速率和岩体动态力学参数对深埋洞室各向同性围岩分区破裂化现象的影响.利用动态Hoek-Brown准则,获得了围岩破裂区和非破裂区的数量和宽度.数值计算结果表明卸荷速率和岩体动态力学参数对破裂区与非破裂区的数量和宽度有较大影响.

THE ZONAL DISINTEGRATION MECHANISM OF ISOTROPIC ROCK MASSES AROUND A DEEP CIRCULAR TUNNEL SUBJECTED TO DYNAMIC UNLOADING

A new mechanical model is proposed to investigate the zonal disintegration mechanism of isotropic rock masses around a deep circular tunnel subjected to dynamic unloading under hydrostatic pressure condition as well as the total elastic stress-field distributions. Effects of unloading rate and dynamic mechanical parameters of isotropic deep rock masses on the zonal disintegration phenomenon of the surrounding rock masses around a deep circular tunnel are taken into account.The number and size of fractured and non-fractured zones is determined using the Hoek-Brown criterion. Numerical computation is carried out. It is found from numerical results that the number and size of fractured and non-fractured zones significantly depend on unloading rate and dynamic mechanical parameters of deep rock masses.