岩土力学 ›› 2023, Vol. 44 ›› Issue (5): 1457-1466.doi: 10.16285/j.rsm.2022.0863

• 基础理论与实验研究 • 上一篇    下一篇

二次加载盐岩损伤自愈合与应变硬化试验研究

赵瑜,杨圳华,王超林,毕靖   

  1. 贵州大学 土木工程学院,贵州 贵阳 550025
  • 收稿日期:2022-06-07 接受日期:2022-08-08 出版日期:2023-05-09 发布日期:2023-04-30
  • 通讯作者: 王超林,男,1989年生,博士,副教授,主要从事岩体渗流理论研究。E-mail:chaolinwang@126.com E-mail:zytyut1@126.com
  • 作者简介:赵瑜,男,1978年生,博士,教授,主要从事岩石力学多场耦合理论研究。
  • 基金资助:
    国家自然科学基金(No. 52264006, No. 52164001, No. 52064006)

Experimental study on damage self-healing and strain hardening of salt rock under secondary loading

ZHAO Yu, YANG Zhen-hua, WANG Chao-lin, BI Jing   

  1. School of Civil Engineering, Guizhou University, Guiyang 550025, Guizhou
  • Received:2022-06-07 Accepted:2022-08-08 Online:2023-05-09 Published:2023-04-30
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52264006, 52164001, 52064006).

摘要: 为研究损伤盐岩的应变硬化和损伤自愈合特性,通过力学试验、孔渗测试试验、核磁试验,探究损伤盐岩于常温静置和围压保压两种情况下盐岩试样的力学性质、渗透率和孔隙度以及孔径分布在应变硬化和损伤自愈合的共同作用下的变化规律,结果表明:(1)损伤盐岩的应变硬化使得岩样塑性减弱,二次加载峰值应变减小,弹性模量变大。常温静置或围压保压处理后盐岩发生损伤自愈合,塑性逐渐恢复,二次加载时峰值应变增大,弹性模量减小。(2)完整盐岩和损伤盐岩试件的应力-应变曲线几乎没有压实阶段,而经过长时间常温静置和围压保压处理后的试件应力-应变曲线出现了明显的压实阶段。(3)完整盐岩渗透率和孔隙度极低,损伤盐岩的渗透率均高出完整盐岩两个数量级,并随着常温静置时间的变长,渗透率和孔隙度缓慢减小。围压保压后的损伤盐岩的渗透率恢复到了与完整盐岩相同的数量级。(4)常温静置和围压保压作用后,部分中孔和大孔愈合成小孔和中孔。(5)常温静置下损伤盐岩就会产生缓慢的损伤自愈合,而围压保压作用可以大幅度提升盐岩损伤自愈合的速度。(6)盐岩的损伤自愈合可分为前期的快速阶段和后期的缓慢恢复阶段。

关键词: 自愈合, 应变硬化, 孔渗, 核磁共振

Abstract: In order to understand the strain hardening and damage self-healing properties of salt rock, the mechanics test, porosity and permeability tests and nuclear magnetic test were performed. The mechanical properties, permeability, porosity and pore size distribution under strain hardening and damage self-healing conditions were investigated after being maintained at room temperature and confining pressure. The results show that: (1) Strain hardening of damaged salt rock weakens the plasticity of rock samples, decreases the peak strain under secondary loading, and increases the elastic modulus. With the maintenance at room temperature or confining pressure, the salt rock self-healing occurs, and the plasticity gradually recovers, while the peak strain increases and the elastic modulus decreases under secondary loading. (2) The stress–strain curves of intact and damaged salt rocks almost have no compacting stage, while the stress–strain curves of intact and damaged salt rocks show obvious compacting stage after long-term maintenance at room temperature and confining pressure. (3) The permeability and porosity of the intact salt rock are very low, and the permeability of the damaged salt rock is two orders of magnitude higher than that of the intact salt rock. With the increase of the maintenance time at room temperature, the permeability and the porosity decrease slowly. The permeability of damaged rock after being maintained at confining pressure is restored to the same order of magnitude as that of intact rock. (4) After being maintained at room temperature and confining pressure, part of the middle pores and large pores healed into small pores and middle pores. (5) Slow self-healing of damaged salt rock occurs when the salt rock is maintained at room temperature, and the confining pressure can greatly improve the speed of self-healing of damaged salt rock. (6) The damage self-healing of salt rock can be divided into rapid recovery stage and slow recovery stage in the later stage.

Key words: self-healing, strain hardening, porosity and permeability, nuclear magnetic resonance (NMR)

中图分类号: 

  • TU 452
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