理论与试验研究

冻融作用下随机损伤花岗岩裂隙演化及力学特性

  • 祝世婕 ,
  • 祁长青 ,
  • 边心宇 ,
  • 邓福起
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  • 河海大学 地球科学与工程学院,南京 211100
祝世婕(1999—),女,江苏泰州人,硕士生,主要从事岩石力学和冻融损伤方面的研究。E-mail:chuhshijie@163.com
祁长青(1979—),男,江苏徐州人,博士,教授,主要从事岩土工程和地质工程的教学和科研工作。E-mail:qichangqing@hhu.edu.cn

收稿日期: 2024-12-28

  网络出版日期: 2025-10-17

基金资助

国家自然科学基金(41877212)

Cracks Evolution and Mechanical Properties of Granite with Random Damage under Freeze-Thaw Action

  • Zhu Shijie ,
  • Qi Changqing ,
  • Bian Xinyu ,
  • Deng Fuqi
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  • School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, P.R. China

Received date: 2024-12-28

  Online published: 2025-10-17

摘要

冻融开裂被认为是高寒地区低渗透硬岩破坏的主要原因之一,反复冻融会导致岩体损伤加剧、强度弱化。通过温度冲击试验获取含随机损伤的花岗岩试样,开展循环冻融试验,通过CT、核磁共振试验研究冻融循环过程中花岗岩微观裂隙演化过程,采用单轴压缩试验研究其力学性质的弱化规律。结果表明:花岗岩在冻融循环作用下的破坏主要由于初始损伤的扩展、连通所导致,岩石的孔隙率和大孔隙的比例都随着冻融循环而逐渐增加;由于随机分布的初始损伤相互影响和制约,难以形成长、大的冻融裂隙,裂隙以不规则网状分布为主;随着冻融循环的进行,岩石渗透性逐渐增强而饱和波速呈现先增大后减小的单峰曲线形式;岩石强度退化服从指数函数的形式,不同初始损伤程度的岩石在长期的冻融风化条件下,强度值和弹性模量值退化关系相似,最终均可能会趋于同一水平。研究成果对寒区致密硬岩的长期力学特性评估和工程稳定性评价具有重要的参考价值。

本文引用格式

祝世婕 , 祁长青 , 边心宇 , 邓福起 . 冻融作用下随机损伤花岗岩裂隙演化及力学特性[J]. 地下空间与工程学报, 2025 , 21(5) : 1554 -1564 . DOI: 10.20174/j.JUSE.2025.05.09

Abstract

Freeze-thaw cracking is considered to be one of the main reasons for the failure of low permeability hard rock in the high cold area, repeated freezing-thawing will lead to increased damage and intensity weakening of rock mass. Granite samples with random damage were obtained through temperature impact test, and cyclic freeze-thaw tests were carried out. CT and nuclear magnetic resonance tests were used to study the evolution process of microscopic cracks in granite during freeze-thaw cycle, and uniaxial compression tests were used to study the weakening law of its mechanical properties. The results show that: The damage of granite under the action of freeze-thaw cycle is mainly caused by the expansion and connectivity of the initial fissure, and the porosity and the proportion of macropores increase gradually with the freeze-thaw cycle. It is difficult to form long and large freeze-thaw fissures due to the mutual influence and restriction of the initial fissures distributed randomly, and the fissures are mainly distributed in irregular network. With the progress of freeze-thaw cycle, the permeability of rock increases gradually and the saturation wave velocity presents a unimodal curve form of first increasing and then decreasing. The degradation of rock strength follows the form of exponential function, and the degradation relationship between strength value and elastic modulus value of rocks with different initial damage degree is similar under the condition of long-term freeze-thaw weathering, and may eventually tend to the same level. The research results have important reference values for the long-term mechanical properties evaluation and engineering stability evaluation of crystal rocks in cold regions.

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