循环荷载作用下盐岩微观结构变化及经验疲劳模型

doi:10.16285/j.rsm.2021.1356

岩土力学 ›› 2022, Vol. 43 ›› Issue (4): 995-1008.doi: 10.16285/j.rsm.2021.1356

循环荷载作用下盐岩微观结构变化及经验疲劳模型

张强^{1, 2}，王军保^{1, 2}，宋战平^{1, 2}，冯世进³，张玉伟^{1, 2}，曾涛^{1, 2}

1. 西安建筑科技大学土木工程学院，陕西西安 710055；2. 西安建筑科技大学陕西省岩土与地下空间工程重点实验室，西安 710055； 3. 同济大学地下建筑与工程系，上海 200092

收稿日期:2021-08-16 修回日期:2021-11-08 出版日期:2022-04-15 发布日期:2022-04-16
通讯作者: 王军保，男，1982年生，博士，教授，主要从事岩石力学及地下工程方面的教学与研究工作。E-mail: xajdwangjunbao@163.com E-mail:nndsjyzq@163.com
作者简介:张强，男，1989年生，博士研究生，主要从事岩石力学与地下工程等方面的研究工作。
基金资助:
国家自然科学基金（No. 52178393，No. 52178354）；陕西省住房和城乡建设科技规划项目（No. 2019-K39）；中国博士后科学基金（No. 2018M643809XB）；陕西省自然科学基础研究计划（No. 2019JQ-762）；陕西省创新团队创新能力支撑计划（No. 2020TD-005）。

Microstructure variation and empirical fatigue model of salt rock under cyclic loading

ZHANG Qiang^{1, 2}, WANG Jun-bao^{1, 2}, SONG Zhan-ping^{1, 2}, FENG Shi-jin³, ZHANG Yu-wei^{1, 2}, ZENG Tao^{1, 2}

1. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China; 2. Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

Received:2021-08-16 Revised:2021-11-08 Online:2022-04-15 Published:2022-04-16
Supported by:
This work was supported by the National Natural Science Foundation of China (52178393, 52178354), the Housing and Urban-Rural Construction Science and Technology Planning Project of Shaanxi Province (2019-K39), the China Postdoctoral Science Foundation (2018M643809XB), the Natural Science Basic Research Program of Shaanxi Province (2019JQ-762) and the Innovation Capability Support Plan of Shaanxi - Innovation Team (2020TD-005).

摘要/Abstract

摘要： 为研究盐岩在循环荷载作用下的疲劳特性和微观结构变化，对盐岩试件展开了不同上限应力下的单轴疲劳试验；同时，利用SEM和NMR设备观测了盐岩试验前后的微观结构。结果表明：循环荷载作用下，盐岩内部裂纹发育以晶间裂纹的生成为主，且裂纹数量随上限应力比（上限应力与单轴抗压强度的比值）增大而增加。循环荷载作用后（12 000次循环），盐岩内部大孔隙和总孔隙数量增加，小孔隙数量减少，且大孔隙和总孔隙增加的数量及小孔隙减少的数量均随上限应力比增大而增加。上限应力比为0.40且荷载循环次数N≤2 000次时，盐岩内部小孔隙、大孔隙和总孔隙数量均随荷载循环次数增加而增加；但小孔隙数量的增长速率大于大孔隙，此时盐岩孔隙结构变化以小孔隙萌生为主。上限应力比为0.40且荷载循环次数N >2 000次时，盐岩内部大孔隙和总孔隙数量仍随荷载循环次数增加而增加，而小孔隙数量不断减少，此时盐岩孔隙结构变化以大孔隙生成为主。通过求解S形函数反函数的方法，建立了一个形式简单、参数少，且能够描述盐岩累计不可逆变形发展全过程的经验疲劳模型，并利用盐岩疲劳试验结果验证了模型的合理性。

关键词: 盐岩, 循环荷载, 微观结构, SEM, NMR, 经验疲劳模型

Abstract: To study the fatigue properties and microstructure variation of salt rock under cyclic loading, uniaxial fatigue tests under different maximum cycling stresses were carried out on salt rock specimens. Meanwhile, scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR) instruments were utilized to analyze the microstructure variation in salt rock before and after the test. The results indicated that the cracks growth mode in salt rock under cyclic loading is mainly the development of intergranular cracks, and the number of cracks increases with the maximum stress ratio (the ratio of the maximum cycling stress to the uniaxial compressive strength). After cyclic loading (12 000 cycles), the number of macropores and total pores in salt rock both increase, whereas the number of micropores decreases; and with the increase of maximum stress ratio, the increasing number of macropores and total pores and the decreasing number of micropores both increase. When the maximum stress ratio is 0.40 and the cycle number N≤2 000, the numbers of micropores, macropores and total pores all increase with cycle number; but the increase rate of micropores is faster than that of macropores, showing that the pore structure variation in salt rock is dominated by the initiation of micropores. When the maximum stress ratio is 0.40 and the cycle number N > 2 000, the number of macropores and total pores still increase with cycle number, whereas the number of micropores decreases, demonstrating that the formation of macropores accounts for the main change of pore structure. By solving the inverse function of S-shaped function, an empirical fatigue model with simpler form and fewer parameters was established, which can describe the whole process of irreversible deformation development of salt rock with a unified function, and the rationality of the model was verified by the fatigue test results of salt rock.

Key words: salt rock, cyclic loading, microstructure, SEM, NMR, empirical fatigue model

中图分类号: TU 45

张强, 王军保, 宋战平, 冯世进, 张玉伟, 曾涛, . 循环荷载作用下盐岩微观结构变化及经验疲劳模型[J]. 岩土力学, 2022, 43(4): 995-1008.

ZHANG Qiang, WANG Jun-bao, SONG Zhan-ping, FENG Shi-jin, ZHANG Yu-wei, ZENG Tao, . Microstructure variation and empirical fatigue model of salt rock under cyclic loading[J]. Rock and Soil Mechanics, 2022, 43(4): 995-1008.

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循环荷载作用下盐岩微观结构变化及经验疲劳模型

Microstructure variation and empirical fatigue model of salt rock under cyclic loading

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