| 双轴加载下断续预置裂纹贯通机制的研究 |
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| 引用本文： | 黄凯珠,林鹏,唐春安,周锦添. 双轴加载下断续预置裂纹贯通机制的研究[J]. 岩石力学与工程学报, 2002, 21(6): 808-816 |
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| 作者姓名： | 黄凯珠 林鹏 唐春安 周锦添 |
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| 作者单位： | 1. 香港理工大学土木与结构工程系,香港
2. 东北大学岩石破裂与失稳研究中心,沈阳,110006 |
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| 基金项目： | 香港理工大学研究基金资助项目(A-PA42)。 |
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| 摘 要： | 通过物理实验和数值模拟,研究双轴作用下不同几何分布和不同围压的断续预置三裂纹的萌生、扩展和贯通机制。结果清楚显示裂纹贯通机制主要受加载条件与预置裂纹几何分布的影响。在双轴加载条件下,裂纹贯通的模式包括拉贯通、剪贯通、压贯通和混合贯通。拉裂纹在双轴加载下, 其扩展速度减慢或停止,且在岩桥间出现剪裂纹,从而形成混合贯通或剪贯通。压裂纹是在侧压下产生的次生裂纹,其贯通受制于两非共线的重叠裂纹间的岩距。当1
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| 关 键 词： | 断续预置裂纹 裂纹贯通 贯通模式 裂纹类型 |
| 文章编号： | 1000-6915(2002)06-0808-09 |
| 修稿时间： | 2000-12-22 |
MECHANISMS OF CRACK COALESCENCE OF PRE- EXISTING FLAWS UNDER BIAXIAL COMPRESSION |
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| Wong Robina H C ,Lin Peng ,Tang Chunan ,Chau K T. MECHANISMS OF CRACK COALESCENCE OF PRE- EXISTING FLAWS UNDER BIAXIAL COMPRESSION[J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(6): 808-816 |
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| Authors: | Wong Robina H C Lin Peng Tang Chunan Chau K T |
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| Affiliation: | Wong Robina H C 1,Lin Peng 2,Tang Chunan 2,Chau1 K T |
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| Abstract: | The mechanism of the fracture coalescence between three flaws is studied using rock-like modelling material under confining pressure condition. The specimens contain three pre-existing flaws with different geometry distribution and different confining condition. Experimental and numerical results show that the mechanisms of crack coalescence is controlled by the geometric setting of the flaws and the confining pressure. Under the confining condition,there are four modes of coalescence between the rock bridge:tensile mode,shear mode,compression mode and mix mode(shear and tensile). The growth of tensile crack slows down with the increasing of confining pressure. Compressive crack is active when the flaws are overlapping and with a distance between two flaws 1
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| Keywords: | non-persistent pre-existing flaw crack coalescence coalescence mode types of initiated crack |
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