含裂隙类岩石单轴压缩疲劳性能试验研究
摘要:为了研究含穿透裂隙类岩石的疲劳破坏行为，揭示含缺陷岩石疲劳损伤和破坏机理，本研究采用预埋抽条法制作含穿透裂隙白水泥试样，通过单轴压缩疲劳试验，探讨不同的裂纹倾角和应力分布对裂纹扩展的影响。试验结果表明：（1）低周疲劳破坏形态与静载压缩破坏形态基本一致，裂纹都是从裂隙尖端萌生，起裂角约为45°～75°，呈一定弧度向受压两端扩展，直至试样破坏，为典型的张拉I型断裂；（2）建立裂纹扩展长度与循环次数关系后发现，裂纹扩展速率随着循环次数的增加而先迅速增加后趋于平稳，最后又迅速增加，验证了疲劳破坏过程经历三个阶段，即疲劳裂纹初始塑性形变阶段、裂纹的缓慢增长阶段和裂纹的快速贯通阶段；（3） 根据对疲劳应变能的分析可以看出，裂纹在萌生阶段所需要的能量较大，在裂纹开始扩展后，应变能密度基本保持不变，说明裂纹扩展过程中所需要的能量趋于稳定；通过对比不同应力水平、应力比的应变能密度曲线可以看出，在较大的应力水平、应力比下，应变能密度逐渐增加，表明试样在较大的应力水平和应力比下能够吸收更多的能量，裂纹的萌生与扩展也就更快。
Abstract:To study the fatigue failure behavior of rocks with penetration cracks and reveal the fatigue damage and failure mechanism of rocks with defects, the cracked white cement specimens were prepared by pre-embedded strip method. The effects of various crack inclination angles and stress distribution on crack propagation was revealed by uniaxial compression fatigue test. The result showed that the fracture trajectory of the low cycle fatigue test was basically the same as that of the static test. The crack initiated from the crack tip and the crack angle was about 45°~75°, which could be considered as typical tensile Mode I fracture. The relationship between crack propagation length and the number of cycles revealed that the crack growth rate increased rapidly with the number of cycles and then underwent a stable phase and finally increased rapidly, which has been verified that the fatigue failure process went through three stages: initial plastic deformation stage, slow growth stage and rapid infiltration stage. According to the analysis of fatigue strain energy, energy required by the crack in the initiation stage was relatively large, and after the crack started to expand, the strain energy density remained basically unchanged, indicating that the energy required in the process of crack expansion tended to be stable. Comparing the strain energy density curves of different stress levels and stress ratios, the strain energy density gradually increased at larger stress levels and stress ratios, indicating that the sample could absorb more energy under larger stress levels and stress ratios, and the energy of crack initiation and propagation was faster.
中文标题：
含裂隙类岩石单轴压缩疲劳性能试验研究
Experimental Study on Uniaxial Compressive Fatigue Property of Cracked Rock-like Materials
作者：
陶伟1,,叶唐进2,,,张文海1,王潇宇3,刘丛丛4
Tao Wei1,,Ye Tangjin2,,,Zhang Wenhai1,Wang Xiaoyu3,Liu Congcong4
作者简介:陶 伟，男，1994年生，汉族，河南驻马店人，在读硕士研究生，主要从事地质灾害相关研究。E-mail：2366915809@qq.com通讯作者:叶唐进，男，1981年生，贵州印江人，在站博士后，副教授，主要从事高原工程地质与灾害地质的研究。E-mail：237492042@qq.com
通讯地址：
1.西藏大学工学院，西藏拉萨 850000 2.四川建筑职业技术学院，四川德阳 618000 3.武汉市天创市政建设有限公司，湖北武汉 430071 4.西藏自然科学博物馆，西藏拉萨 850000
1.SchoolofEngineering,TibetUniversity,Lhasa850000,Xizang,China 2.SichuanCollegeofArchitecturalTechnology,Deyang618000,Sichuan,China 3.WuhanTianChuangMunicipalConstructionCo.,Ltd.,Wuhan430071,Hubei,China 4.TibetMuseumofNaturalSciences,Lhasa850000,Xizang,China
中图分类号:TU 458
doi:10.3969/j.issn.1007-2993.2022.05.009
出版物：岩土工程技术
收稿日期:2021-05-31
刊出日期:2022-10-08
关键词:裂纹扩展,疲劳,应变能密度,破坏机理,类岩石
Key words:crack propagation,fatigue,strain energy density,failure mechanism,rock-like materials
文档包含图片数量：图片(8)张
文档包含表格数量：表格(1)个
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基金项目：
基金项目:国家自然科学基金项目(41662020)；西藏大学研究生高水平人才培养计划项目（2019-GSP-S056）
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