深部岩体损伤对分区破裂化效应的影响

深部岩体是一种具有初始损伤的非连续介质，其内部存在着大量节理和裂隙。深部岩体分区破裂化效应与节理、裂隙的扩展、连接和汇合密切相关。由于节理、裂隙的扩展、连接和汇合可能会导致深部岩体的内部空间由欧氏几何空间向非欧几何空间转化。本文利用损伤变量表示含节理和裂隙岩体的损伤，根据非欧几何模型，获得了静水压力和非静水压力情况下深部圆形洞室损伤围岩的应力场，确定了损伤变量对圆形洞室围岩的应力场和分区破裂化效应的影响。采用Hoek-Brown准则，获得了静水压力和非静水压力情况下损伤围岩的破裂区与非破裂区的分布规律。本文的研究结果为理解深部岩体分区破裂模式提供了有价值的参考。

INFLUENCE OF ROCK DAMAGE ON ZONAL DISINTEGRATION AROUND DEEP CIRCLE TUNNELS

The deep rock mass is discontinuous medium containing cracks and joints.The zonal disintegration in deep rock mass is sensitive to the nucleation,growth and coalescence of cracks.These evolutions of cracks may induce a transform from Euclidean geometry space in deep rock mass to Non-euclidean one.In this paper,a damage variable is introduced to describe the evolution of cracks and joints in the deep rock mass.The elastic stress fields around a deep circle tunnel under hydrostatic and non-hydrostatic pressure condition are obtained using the non-Euclidean model,and then the influences of damage on the elastic stress field and the zonal disintegration around the deep tunnel are discussed in detail.The distributions of the fractured and non-fractured zones around the deep circle tunnel under hydrostatic and non-hydrostatic pressure condition are determined using Hoek-Brown criterion.The present study is helpful to understand the zonal disintegration in deep rock mass.