| 单轴压缩岩石不同边界裂纹扩展数值模拟研究 |
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| 引用本文： | 方恩权,蔡永昌,朱合华.单轴压缩岩石不同边界裂纹扩展数值模拟研究[J].地下空间与工程学报,2009,5(1). |
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| 作者姓名： | 方恩权 蔡永昌 朱合华 |
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| 作者单位： | 同济大学,地下建筑与工程系,上海,200092;同济大学岩土及地下工程教育部重点实验室,上海,200092 |
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| 基金项目： | 教育部科学技术研究重点项目，国家自然科学基金 |
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| 摘 要： | 对于单轴压缩的岩石试件,其破坏形式主要是微裂纹的摩擦滑移、自相似平面扩展和弯折扩展.基于断裂力学机制,运用FLAC的显式有限差分数值模拟技术,对单轴压缩荷载下三种不同边界形状,即直边、凸形、凹形情况下含近边界预置斜裂纹的岩石模型进行了数值模拟研究.研究结果表明,基于Interface界面单元建立的裂纹扩展模式以Z型翼裂纹扩展为主,可以较好地模拟裂纹扩展过程.预置裂纹倾角和边界形状对近边界裂纹起裂应力及裂纹扩展过程都有一定的影响.凹边界情况下裂纹扩展较为稳定,无非稳定扩展情况的出现,而直边界和凸边界情况裂纹扩展均由稳定扩展到非稳定扩展逐步进行.
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| 关 键 词： | 近边界裂纹 裂纹扩展 单轴压缩 数值模拟 |
Numerical Studies of Crack Propagation in Free Boundary Shape under Uniaxial Compression |
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| FANG En-quan,CAI Yong-chang,ZHU He-hua.Numerical Studies of Crack Propagation in Free Boundary Shape under Uniaxial Compression[J].Chinese Journal of Underground Space and Engineering,2009,5(1). |
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| Authors: | FANG En-quan CAI Yong-chang ZHU He-hua |
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| Affiliation: | 1.Department of Geotechnical Engineering;Tongji University;Shanghai 200092;China;2.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education;China |
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| Abstract: | For rock samples at uniaxial compression test,its failure forms include friction slippage,self-analogue plane expansion and crankle expansion of micro-cracks.Based on the fracture mechanism,rock models with pre-existing inclined flaw situated close to the boundary are studied by explicit finite element type simulation using FLAC,considering three different boundary shapes,i.e.rectilinear,convex and concave.The result shows that the fracture pattern of crack growth based on "interface" element is a "Z" wing ... |
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| Keywords: | crack nearby free boundary crack propagation uniaxial compression numerical simulation |
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