| 考虑渗透力作用的危岩主控结构面断裂力学求解 |
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| 引用本文： | 陈洪凯,张祎.考虑渗透力作用的危岩主控结构面断裂力学求解[J].土木建筑与环境工程,2008,30(5):77-80. |
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| 作者姓名： | 陈洪凯 张祎 |
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| 作者单位： | 重庆交通大学,岩土工程研究所,重庆,400074;重庆大学,西南资源开发及环境灾害控制工程教育部重点实验室,重庆,400044;重庆交通大学,岩土工程研究所,重庆,400074 |
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| 摘 要： | 危岩失稳的本质是主控结构面在荷载作用下产生的断裂扩展。从宏观力学角度来看，复合型危岩主控结构面受力机理可概括为压剪、拉剪两种形式。通过介绍主控结构面内渗透力的计算模型，应用线弹性断裂力学的最大周向应力准则，建立了在渗透力作用下两种受力形式的危岩主控结构面应力强度因子和断裂角的计算方法。以重庆万州首立山危岩为例计算结果表明，渗透力的存在使得应力强度因子明显增大，并分别就动、静水压力的影响作了分析。
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| 关 键 词： | 岩石力学 断裂力学 危岩 主控结构面 渗透力 应力强度因子 |
A Fracture Mechanics Solution for Control Fissures in Perilous Rock under Seepage Stress |
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| Affiliation: | Institute of Geotechnical Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China; Key Laboratory for the Exploitation of Southwestern Resources and Environmental Disaster Control Engineering, Ministry of Education, Chongqing Universi;Institute of Geotechnical Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China |
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| Abstract: | Crack propagation of control fissures in perilous rock under loads is a key process in the failure of perilous rock. Based on the loading mechanism, the control fissures are classified into compression shear and tension shear types. By introducing a model of seepage stress, the calculating principle of the stress intensity factor and the propagation orientation of control fissure under seepage stress are put forward using fracture mechanics methods. Using Shoulishan perilous rock in the Wanzhou district of Chongqing, P. R. China, as an example, the calculated results show that there is an obvious increase of the stress intensity factor. The influence of hydrostatic pressure and hydrodynamic pressure also are analyzed. |
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| Keywords: | rock mechanics fracture mechanics perilous rock control fissure seepage stress stress intensity factor |
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