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双交叉裂隙岩桥相互作用与破坏行为试验研究
Experimental study on rock bridges interaction and failure characteristics of double-cross-flaw
投稿时间:2022-04-18  修订日期:2022-07-05
DOI:
中文关键词:  交叉裂隙  力学行为  破坏模式  3D打印  DIC分析
英文关键词:Cross-flaw  Mechanical behavior  Failure mode  3D printing  DIC analysis
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
陈康 河北工业大学 土木与交通学院 300401
邵亚建 河北工业大学 土木与交通学院 300401
王酉钰 河北工业大学 土木与交通学院 300401
马国伟 河北工业大学 土木与交通学院 300401
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中文摘要:
      双交叉裂隙是工程岩体中构成断续交叉节理的基本单元。由于裂隙几何与空间参数不同而形成多组岩桥,岩桥交互作用对双交叉裂隙的起裂、扩展、贯通、断裂过程存在显著影响。本文以光敏树脂3D打印制备不同次裂隙长度的双交叉裂隙试样,并低温处置使其脆化。开展单轴抗压试验获得试样的力学性能,辅以数字图像相关方法(DIC)监测试样的变形行为,以及高速摄像机采集裂纹生成过程和裂隙扩展形式。结果表明:随次裂隙长度的增加,双交叉裂隙试样的峰值强度呈现先增加后减小的趋势,而与弹性模量没有显著相关关系。试样荷载破坏过程,应力集中于最短岩桥(主导岩桥)的两端,主导着初始裂纹的形成。同时,随着次裂隙长度的增长,双交叉裂隙主导岩桥也在动态变化。尖端裂纹的扩展路径主要受到剪切路径的影响,而剪切路径随加载进程动态变化,由外侧向主导岩桥位置逐步靠拢,控制着次生裂隙的扩展角度。
英文摘要:
      A double-cross-flaw is the basic unit of non-persistent cross joints in engineering rock mass. Multiple rock bridges are formed in the double-cross-flaw due to different flaw geometry and spatial parameters. The rock-bridge interaction has a significant impact on the initiation, propagation, penetration and fracture processes of these flaws. In this paper, double-cross-flaw specimens with different minor-flaw lengths were prepared by 3D printing with photosensitive resin, and treated at low temperature to make them brittle. And then, uniaxial compression tests were carried out on the specimens to obtain mechanical properties, supplemented by digital image correlation method (DIC) to detect the deformation behavior, and high-speed camera to capture the cracking process and propagation form. The results show that, during the increase of minor-flaw length, the peak strength of the double-cross-flaw specimen showed a trend of first increasing and then decreasing, but there was no significant correlation between minor-flaw length with the elastic modulus. During the specimen failure process, the stress is concentrated at both tips of the shortest rock bridge (dominant rock bridge), which dominates the formation of initiation cracks. At the same time, with the increase of the length of the minor-flaw, the dominant rock bridge of the double-cross flaw is also changing dynamically. The crack propagation path of the flaw tips is mainly affected by the shear path, which changes dynamically with the loading process. The shear path gradually moves towards the position of the dominant rock bridge from the outside, which controls the expansion angle of the secondary fractures.
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