理论与试验研究

节理砂质板岩卸荷力学特性及能量演化规律研究

  • 王乐华 ,
  • 郭晋帆 ,
  • 陈灿 ,
  • 徐健文 ,
  • 许晓亮
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  • 三峡大学 三峡库区地质灾害教育部重点实验室,湖北 宜昌 443002
王乐华(1977—),男,安徽怀宁人,博士,教授,主要从事岩土工程方面的教学与研究工作。E-mail:lehuatg@126.com
许晓亮(1989—),男,甘肃天水人,博士,副教授,主要从事岩土工程等领域的教学与科研工作。E-mail:sichuan106@ctgu.edu.cn

收稿日期: 2024-04-18

  网络出版日期: 2025-03-12

基金资助

湖北省自然科学基金(2022CFB345);国家自然科学基金雅砻江联合基金(U1965109)

Study on the Mechanical Properties and Energy Evolution Law of Unloading of Jointed Sandy Slate

  • Wang Lehua ,
  • Guo Jinfan ,
  • Chen Can ,
  • Xu Jianwen ,
  • Xu Xiaoliang
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  • Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang, Hubei 443002, P.R. China

Received date: 2024-04-18

  Online published: 2025-03-12

摘要

为揭示不同节理类型下砂质板岩卸荷破坏力学特性和能量演化规律,采用RMT-150C岩石力学试验系统开展常规三轴压缩试验和卸荷试验,探讨节理板岩的承载能力、破坏模式及能量演化特征,并基于耗散能提出损伤变量。结果表明:(1)节理类型对试样的承载能力有较大影响,峰值强度主要表现为无节理试件>双节理试件>单节理试件;(2)试样的宏观破坏模式以剪切破坏为主。卸荷作用会使单节理试件在节理端部产生横向裂隙,而双节理试件则产生贯通性裂纹;(3)总能量和耗散能整体呈现单节理试件<双节理试件<无节理试件的规律,试样的损伤变量(损伤程度)亦是如此。试验结果有助于深入理解不同节理类型岩石力学行为及能量演化特性,可为岩体在卸载围压作用下结构稳定性提供必要依据。

本文引用格式

王乐华 , 郭晋帆 , 陈灿 , 徐健文 , 许晓亮 . 节理砂质板岩卸荷力学特性及能量演化规律研究[J]. 地下空间与工程学报, 2025 , 21(1) : 87 -99 . DOI: 10.20174/j.JUSE.2025.01.10

Abstract

In order to reveal the mechanical properties and energy evolution law of unloading failure of sandy slate under different joint types, the conventional triaxial compression test and unloading test were carried out by using RMT-150C rock mechanics test system. The bearing capacity, failure mode and energy evolution characteristics of jointed slate were discussed, and the damage variable was proposed based on dissipation energy. The results show that: (1)The joint type has a great influence on the bearing capacity of the specimen, and the peak strength is mainly manifested as no joint specimen>double joint specimen>single joint specimen; (2)The macroscopic failure mode of the specimen is mainly shear failure. The unloading effect will cause the single joint specimen to produce transverse cracks at the joint end, while the double joint specimen will produce penetrating cracks. (3)The total energy and dissipated energy show the law of single joint specimen<double joint specimen<jointless specimen, and the damage variable (damage degree)of the specimen is also the same. The test results are helpful to understand the mechanical behavior and energy evolution characteristics of different joint types of rock, and provide the necessary basis for the structural stability of rock mass under unloading confining pressure.

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