重庆大学学报2025，Vol.48Issue(8)：1-13,13.DOI:10.11835/j.issn.1000-582X.2024.260
冻融循环作用下裂隙灰岩的力学特性及裂纹扩展特征
The mechanical properties and crack propagation characteristics of fractured limestone under freeze-thaw cycles
摘要
Abstract
The deformation and failure of rock masses in cold regions due to repeated freeze-thaw cycles present critical challenges that demand thorough investigation.This study examines the mechanical properties and crack propagation characteristics of fractured limestone subjected to varying numbers of freeze-thaw cycles and crack inclination angles.Uniaxial compression tests were conducted,and corresponding stress-strain responses and macroscopic failure patterns were obtained.The fracture surfaces were further analyzed using scanning electron microscopy.Results indicate that repeated freeze-thaw cycles induce pronounced brittle failure in fractured limestone.Peak stress and elastic modulus increase with crack inclination but decrease with the number of freeze-thaw cycles,while peak strain shows positive correlation with both variables.Macroscopic failure is primarily governed by crack-induced breakage,with spalling as a secondary mode.Fracture surfaces predominantly exhibit tensile cracks influenced by pre-existing flaws,but not by the number of freeze-thaw cycles.Microscopically,freeze-thaw action promotes the development of internal microcracks-evidenced by increased crack length,width and density-while pre-existing cracks exert minimal influence on microstructural features.Increasing crack inclination angles suppresses freeze-thaw damage,thus improving rock durability.These findings provide valuable insights for improving the stability and longevity of rock structures in cold-region mining engineering.关键词
裂隙灰岩/裂隙倾角/冻融循环/单轴压缩/峰值应力Key words
fractured limestone/fissure dip angle/freeze-thaw cycle/uniaxial compression/peak stress分类
建筑与水利引用本文复制引用
吴小刚,倪智伟,朱君星,秦柯,唐恺..冻融循环作用下裂隙灰岩的力学特性及裂纹扩展特征[J].重庆大学学报,2025,48(8):1-13,13.基金项目
国家重点研发计划项目(2019YFC1803502,2021YFC3001303).Supported by the National Key Research and Development Program of China(2019YFC1803502,2021YFC3001303). （2019YFC1803502,2021YFC3001303）
