| 高渗压条件下压剪岩石裂纹断裂损伤演化机制研究 |
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| 引用本文： | 刘涛影,曹平,章立峰,赵延林,范祥.高渗压条件下压剪岩石裂纹断裂损伤演化机制研究[J].岩土力学,2012,33(6):1801-1815. |
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| 作者姓名： | 刘涛影 曹平 章立峰 赵延林 范祥 |
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| 作者单位： | 1. 中南大学 资源与安全工程学院，长沙 410083；2. 华东勘测设计研究院，杭州 310006； 3. 湖南科技大学 能源与安全工程学院，湖南 湘潭 411201 |
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| 基金项目： | 国家自然科学基金资助项目(No.0972238);中南大学研究生学位论文创新基金专项科研资助项目(No.010ssxt240) |
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| 摘 要： | 探讨了高渗透压作用下压剪岩石裂纹的起裂规律及分支裂纹尖端应力强度因子的演变规律，建立了高渗压下裂隙岩体发生拉剪破坏的临界水压力值和初裂强度判据，分析了不同渗压作用下裂纹的扩展情况表明，渗透压的存在加剧了分支裂纹的扩展，高渗透压作用下分支裂纹扩展由稳定扩展变成不稳定扩展，并导致分支裂纹尖端岩桥剪切破坏，同时考虑分支裂纹的相互作用,建立了高渗透压作用下压剪岩石裂纹体岩桥剪切贯通的断裂破坏力学模型，最后依据裂隙岩体的损伤力学效应研究了岩体的初始损伤及损伤演化柔度张量，提出了高渗压下压剪岩石裂纹渐进破坏的损伤演化方程。该理论为定量研究高渗压下裂隙岩体的失稳破坏提供了理论依据。
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| 关 键 词： | 高渗压 应力强度因子 裂纹扩展 断裂损伤准则 损伤演化方程 |
| 收稿时间： | 2011-01-12 |
Study of fracture damage evolution mechanism of compression-shear rock cracks under high seepage pressure |
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| LIU Tao-ying
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CAO Ping
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ZHANG Li-feng
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ZHAO Yan-lin
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FAN Xiang.Study of fracture damage evolution mechanism of compression-shear rock cracks under high seepage pressure[J].Rock and Soil Mechanics,2012,33(6):1801-1815. |
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| Authors: | LIU Tao-ying CAO Ping ZHANG Li-feng ZHAO Yan-lin FAN Xiang |
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| Institution: | 1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China; 2. Hydro China Huadong Engineering Corporation, Hangzhou 310006, China; 2. School of Energy and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China |
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| Abstract: | Initial cracking law and evolution law of stress intensity factor at the tip of the branch crack of compression-shear fractured rock under high seepage pressure are discussed.The critical water pressure value and the initial cracking intensity criterion of the fractured rock mass under high seepage pressure are established when tension-shear failure occurs.The cracking characteristics under different water pressures indicate that the existence of osmotic pressure aggravates the growth of branch crack;and the branch crack propagation under high osmotic pressure will convent from stable expansion to unstable expansion and cause the shear failure of the crag bridge at the branch crack tip;simultaneously the branch crack interaction is considered,the crag bridge s cutting penetration damage mechanical model of the compression-shear rock under the high seepage pressure is established.Finally,the flexibility tensor of the rock mass initial damage and its damage evolution based on damage mechanical effect of fractured rock are studied.Then a damage evolution equation of fractured rock under high seepage pressure is proposed.The theory provides the basis for the quantitative investigation about the compression-shear destruction of fractured rock under high seepage pressure. |
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| Keywords: | high seepage pressure stress intensity factor crack propagation damage and fracture criterion damage evolution equation |
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