›› 2018, Vol. 39 ›› Issue (2): 644-650.doi: 10.16285/j.rsm.2016.0451

• 基础理论与实验研究 • 上一篇    下一篇

三轴压缩下含夹层盐岩破坏机制

马旭强1,施锡林1,尹洪武1,杨春和1, 2,李银平1,马洪岭1   

  1. 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071; 2. 重庆大学 煤矿灾害动力学与控制国家重点实验室,重庆 400044
  • 收稿日期:2016-04-25 出版日期:2018-02-10 发布日期:2018-06-06
  • 通讯作者: 施锡林,男,1983年生,博士,助理研究员,主要从事石油天然气地下储备方面的研究工作。E-mail:xlshi@whrsm.ac.cn E-mail:maxuqiang@yeah.net
  • 作者简介:马旭强,男,1987年生,博士,主要从事盐穴储气库建造及稳定性分析方面的研究工作。
  • 基金资助:

    国家自然科学基金资助项目(No. 51774266,No. 51404241,No. 41472285)。

Failure mechanisms of salt rock with an interlayer under triaxial compression

MA Xu-qiang1, SHI Xi-lin1, YIN Hong-wu1, YANG Chun-he1,2, LI Yin-ping1, MA Hong-ling1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. Key Laboratory for the Exploitation of Southwest Resources and Environmental Disaster Control Engineering of Ministry of Education, Chongqing University, Chongqing 400044, China
  • Received:2016-04-25 Online:2018-02-10 Published:2018-06-06
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51774266, 51404241, 41472285).

摘要: 针对三轴压缩试验中含夹层盐岩特殊的破坏形式和机制开展研究。基于夹层单元的受力平衡和界面剪应力的传递机制,建立了夹层径向位移的微分方程,通过求解该微分方程得到了界面剪应力、夹层应力和应变的理论公式,并采用数值模拟验证了应力公式的准确性,进而结合多种破坏准则分析了含夹层盐岩的两种破坏形式及其机制。结果表明:界面剪应力和夹层应力分布不均匀,其最大值一般分别在边缘和中心位置出现;对于试样中夹层纵向劈裂,计算显示夹层存在横向的拉应力或拉应变;在一些试样界面边缘发现了环状白色裂纹,这是由于界面边缘剪应力最大,该处容易发生界面滑移破坏。夹层和界面的破坏会导致含夹层盐岩的密闭性降低,研究成果可在这一方面提供参考。

关键词: 盐岩, 夹层, 界面, 三轴压缩, 破坏机制

Abstract: Triaxial compression tests were conducted on salt rock specimens with an interlayer to investigate its failure modes and failure mechanisms. Based on the force balance of an interlayer element and the transfer mechanism of shear stress on the interface, we established a differential equation of the interlayer's radial displacement. The theoretical formulas of shear stress on the interface, and stresses and strains of the interlayer were obtained by solving the differential equation. Numerical simulation was also performed to verify the accuracy of these stress formulas. Moreover, failure modes and failure mechanisms of salt rock with an interlayer are analysed by various failure criteria. It is found that shear stress on the interface and stress of the interlayer are not uniformly distributed, and their maximum values are typically in the edge and the centre. With regards to vertical splitting of the interlayer, calculations suggest that tensile stress or tensile strain in the horizontal direction occurs in the interlayer. A ring-shaped white crack is observed in the edge of the interface of some specimens, which is caused by the maximum shear stress on the interface. Thus, the sliding failure of the interface is prone to happen. The induced failures of the interface and the interlayer lead to a decrease in tightness of salt rock with an interlayer.

Key words: salt rock, interlayer, interface, triaxial compression, failure mechanisms

中图分类号: 

  • TU 458

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