横观各向同性岩石亚临界裂纹扩展实验研究

发布时间：2018-01-06 09:25

本文关键词：横观各向同性岩石亚临界裂纹扩展实验研究　出处：《中南大学学报(自然科学版)》2017年06期 　论文类型：期刊论文

【摘要】：在MTS Insight电子拉力试验机上采用常位移松弛法,对具横观各向同性的板岩开展亚临界裂纹扩展试验研究,获得应力强度因子KI与裂纹扩展速率v的关系及I型断裂韧度KIC,揭示不同节理倾角α下裂纹亚临界扩展规律。研究结果表明:各个节理倾角下的lgK_I-lgv具有很好的线性规律;当节理倾角为0°~45°时,回归参数a随倾角的增大而增大,回归参数b随倾角的增大而减小;当节理倾角为45°~90°时,回归参数a随倾角的增大而减小,回归参数b随倾角的增大而增大,亚临界裂纹扩展参数A和n分别与回归参数a和b变化规律相同;断裂韧度KIC以及松弛最大荷载P_(max)均符合"U"型抛物线分布,当节理倾角为0°~45°时,两者随倾角的增加而减小,当节理倾角为45°~90°时,两者随倾角的增加而增大,同时,两者均在节理倾角为0°时取得最大值,在节理倾角为45°时取得最小值。
[Abstract]:Constant displacement relaxation method is adopted in MTS Insight electronic tensile testing machine, carry out experimental research on subcritical crack propagation with transversely isotropic slate, obtain the relationship between the stress intensity factor KI and crack growth rate of V and I type fracture toughness KIC, extended to reveal the rules with different joint angle crack subcritical. The results show that: each joint angle under lgK_I-lgv has very good linearity; when the dip angle is 0 degrees ~45 degrees, the regression parameter a with angle increases, the regression parameters of B with the increase of angle decreases; when the dip angle is 45 degrees ~90 degrees, the regression parameter a with angle increases, regression parameter B with angle increases, the subcritical crack growth parameters of A and N respectively with a and B regression parameter variation; fracture toughness KIC and the relaxation of the maximum load P_ (max) are in line with the "U" type parabolic distribution, when the joint angle When the angle is 0 degrees ~45, both of them decrease with the increase of dip angle. When the joint dip angle is 45 degrees ~90 degrees, both of them increase with the increase of the dip angle. At the same time, both of them reach the maximum value when the joint dip is 0 degrees, and the minimum value is obtained when the joint dip angle is 45 degrees.

【作者单位】：中南大学资源与安全工程学院;
【基金】：国家自然科学基金资助项目(51374246,51304240) 湖南省科技计划项目(2013FJ6002)~~
【分类号】：TU452
【正文快照】： 岩体是结构面和完整岩石组成的地质结构体,与一般介质的重大差别在于它是由众多结构面纵、横切割而具有一定结构的多裂隙体。任何岩体工程的失稳破坏都是岩体中裂纹产生、扩展及贯通的结果,其主要经过裂隙孕育阶段—裂纹的稳定、准静态扩展阶段—裂纹快速发展岩石破坏阶段。从

【相似文献】