| 考虑裂隙水压力的岩体压剪裂纹扩展规律研究 |
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| 引用本文： | 邓华锋,李建林,刘杰,朱敏,郭靖,鲁涛.考虑裂隙水压力的岩体压剪裂纹扩展规律研究[J].岩土力学,2011,32(Z1):297-0302. |
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| 作者姓名： | 邓华锋 李建林 刘杰 朱敏 郭靖 鲁涛 |
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| 作者单位： | 三峡大学土木与建筑学院 |
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| 基金项目： | 国家自然科学基金资助项目(No.51079077,No.51009083);湖北省教育厅科学研究计划项目(No.2008CDB366) |
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| 摘 要： | 在库水位大幅度升、降变化时,容易导致岩体内增量裂隙压力的集中,使断裂面上有效应力降低,裂纹面尖端的应力强度因子增加。当达到临界强度因子时,可能使岩体内裂纹、裂隙贯通、扩展,形成连续的复式破坏面,从而使边坡稳定性降低,造成边坡的失稳。基于此,从断裂力学角度分析了裂隙水压力对裂纹强度因子的影响,对考虑裂隙水压力作用的Ⅰ、Ⅱ型复合裂纹扩展规律进行了研究,结果表明:Ⅰ、Ⅱ型复合裂纹的裂纹扩展角的变化,不仅与裂纹的闭合程度、斜裂纹倾角、双向应力大小有关,还与裂隙水压力的大小、裂纹面的摩擦系数有关;并且在相同情况下,未闭合裂纹的扩展角要大于闭合裂纹的扩展角;对于闭合裂纹,裂纹面摩擦系数越小,扩展角越大;最后,推导了基于摩尔-库仑准则考虑裂隙水压力的岩体断裂韧度KIc、KIIc和压剪状态下Ⅰ、Ⅱ型复合断裂判据。研究成果为分析水岩作用下裂隙岩体的失稳破坏提供了重要的参考。
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| 关 键 词： | 裂隙水压力 强度因子 压剪 断裂判据 |
| 收稿时间： | 2010-12-21 |
Research on propagation of compression shear fracture in rocks considering fissure water pressure |
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| DENG Hua-feng,LI Jian-lin,LIU Jie,ZHU Min,GUO Jing,LU Tao.Research on propagation of compression shear fracture in rocks considering fissure water pressure[J].Rock and Soil Mechanics,2011,32(Z1):297-0302. |
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| Authors: | DENG Hua-feng LI Jian-lin LIU Jie ZHU Min GUO Jing LU Tao |
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| Institution: | College of Civil Engineering & Architecture, China Three Gorges University, Yichang, Hubei 443002, China |
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| Abstract: | The large-amplitude variation of the reservoir water level will easily lead to the concentration of incremental interstitial pressure, which will decrease the effective stress on the fracture surface, and increase the stress intensity factor of the crack tip. When the stress intensity factor reaches the critical value, the crack and fracture in the rock strata will transfix, expand and then damage; the continuous complex failure surface will shape; and the slope stability will decrease which will causes the destabilization of the bank slopes. Based on the previous contents, the impact of fissure water pressure on the crack intensity factor is analyzed from the point of fracture mechanics, and the expand of Ⅰ-Ⅱmixed mode crack is analyzed considering the impact of fissure water pressure. The results show that the crack growth angle of Ⅰ-Ⅱmixed mode crack change not only with the crack closure degree, oblique crack inclination angle and the magnitude of the biaxial stress, but also with the magnitude of the fissure water pressure and the friction coefficient of the crack edges. Moreover, in the same circumstances the non-closed crack growth angle is larger than the closed crack growth angle. For closed crack, the smaller the friction coefficient of the crack edges is, the larger the crack growth angle is. Finally, the rock mass fracture toughness KIc, KIIc considering the role of the fissure water pressure and the Ⅰ-Ⅱcompound fracture criterion under the compression-shear are conducted based on Mohr-Coulomb criterion. The relevant conclusions of our research provide an important reference for studying fractured rock mass failure under the water-rock interaction. |
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| Keywords: | fissure water pressure intensity factor compression shear fracture criterion |
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