动态开挖卸荷条件下深埋圆形洞室各向同性围岩的分区破裂化机理  

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

作　　者：周小平[1,2,3] 毕靖[1] 钱七虎[1,4] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [3]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [4]解放军理工大学国防工程学院,南京210007

出　　处：《固体力学学报》2013年第4期352-360,共9页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金(51279218;51078371);重庆市自然科学基金院士专项(CSTC2013JJYS3001);国家重点实验室课题(2011DA105287MS201204)资助

摘　　要：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.A new mechanical model is proposed to investigate the influence of dynamic unloading on the zonal disintegration mechanism of isotropic rock masses around a deep circular tunnel under the hydro- static pressure condition as well as the total elastic stress-field distributions,with a special attention to the effects of unloading rate and dynamic mechanical parameters of isotropic deep rock masses on it. The num- ber and size of fractured and non-fractured zones are determined using the Hock-Brown criterion. Numerical computation is carried out, showing that the number and size of fractured and non-fractured zones strongly depend on unloading rate and dynamic mechanical parameters of deep rock masses.

关 键 词：分区破裂化 各向同性围岩 深埋圆形洞室 动态卸荷 

分 类 号：TU452[建筑科学—岩土工程]