| 拉剪应力状态下裂隙岩体动态损伤演化 |
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| 引用本文： | 陈星,黄坚,冷云,陈兴周.拉剪应力状态下裂隙岩体动态损伤演化[J].西北水电,2010(4):17-20. |
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| 作者姓名： | 陈星 黄坚 冷云 陈兴周 |
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| 作者单位： | 1. 三峡大学三峡库区地质灾害教育部重点实验室,湖北省宜昌市,443002
2. 中国水电顾问集团西北勘测设计研究院,西安,710065 |
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| 摘 要： | 岩体开挖是一个不断卸荷、变形损伤、质量劣化的动态力学过程。卸荷状态下,拉剪复合断裂是岩体断裂中最危险的一种情况。现应用断裂力学和损伤力学,对裂隙卸荷损伤岩体的力学性质进行研究。总结拉剪应力状态下裂隙岩体损伤力学模型,分析得出：拉剪应力状态下裂隙裂化、损伤积累,损伤演化表现为＂动态损伤＂;而后以某水电站边坡的开挖卸荷为例,验证了岩体裂隙损伤贯通直至破坏的过程。
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| 关 键 词： | 裂隙岩体 拉剪应力 卸荷损伤 动态演化 |
Dynamic damage evolution of fissured rock mass under tensile-shear stress |
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| CHEN Xing,HUANG Jian,LENG Yun,CHEN Xing-zhou.Dynamic damage evolution of fissured rock mass under tensile-shear stress[J].Northwest Water Power,2010(4):17-20. |
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| Authors: | CHEN Xing HUANG Jian LENG Yun CHEN Xing-zhou |
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| Affiliation: | 1.Education Ministry＇s Key Lab in Three Gorges University for Geological Hazards at Three Gorges Reservoir Area,Yichang 443002,China;2,Hydrochina Xibei Engineering Corporation,CHECC,Xi＇an 710065,China) |
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| Abstract: | Rock mass excavation is a continuous dynamic mechanics process of unloading,deformation damage and quality deterioration.Under the unloading state,tensile-shear fracture is one of the most dangerous cases.Based on fracture mechanics and damage mechanics,this paper presents the mechanical properties of the rock under unloading fracture damage and summarizes the damage mechanics model of tension-shear fractured rock mass.The conclusion is that fissure cracking,damage accumulation and evolution are performed as ＂dynamic damage＂ under tensile-shear stress.Finally,as a case study of a hydroelectric station,the slope excavation unloading shows the process from damage accumulation to total failure of rock mass. |
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| Keywords: | Fissured rock mass tensile-shear stress unloading damage dynamic evolution |
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