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青藏高原活动断裂广泛分布,岩体中存在大量的裂隙,冻融作用下裂隙岩体易进一步损伤劣化,导致岩体结构失稳。为探究冻融作用下完整岩体和裂隙岩体的力学特性、破坏模式及微观损伤,以拉岗村滑坡砾岩为对象,预制2 cm和4 cm裂隙岩样,开展完整和裂隙岩样的0、20、40和60次冻融后的三轴卸荷试验。通过CT扫描获取冻融岩样的微观孔隙结构、孔隙率、渗透率及灰度值,分析微观冻融损伤演化特征和力学特性。基于CT图像灰度值定义了冻融损伤变量,引入损伤力学理论和Weibull分布函数,构建了考虑冻融损伤的本构模型。结果表明:冻融导致砾岩峰值应力降低,裂隙会弱化砾岩强度,且裂隙越深弱化越显著;冻融作用下,含裂隙砾岩从单一张拉破坏转为复杂的张拉-剪切混合破坏,冻融循环次数越多,剪切及张拉破坏面数量越多;冻融使孔隙数目减少、喉道数目增加、孔隙连通性增强,平均灰度值随冻融循环次数增加而减小;冻融循环60次后,无裂隙、预制2 cm及4 cm裂隙岩样的渗透率分别增加1.87%、55.56%和183.90%,灰度值分别减少43.93、50.96和73.53;考虑冻融的损伤本构模型可准确表征不同冻融循环次数下砾岩从变形到破坏的完整演化过程,能较好描述其冻融后损伤特性。研究成果可为探索青藏高原裂隙岩体冻融损伤机理提供参考。
Abstract：Active faults are widely distributed on the Qinghai-Tibet Plateau, and there are a large number of fissures in rock masses. Under freeze-thaw action, fissured rock masses are prone to further damage and deterioration, leading to the instability of rock mass structures. To explore the mechanical properties, failure modes, and microscopic damage of intact and fissured rock masses under freeze-thaw action, taking the conglomerate from Lagangcun landslide as the research object, rock samples with prefabricated fissures of 2 cm and 4 cm were prepared. Triaxial unloading tests were carried out on intact and fissured rock samples after 0, 20,40, and 60 freeze-thaw cycles. The microscopic pore structure, porosity, permeability, and grayscale value of freeze-thawed rock samples were obtained by CT scanning, and the evolutionary characteristics of microscopic freeze-thaw damage and mechanical properties were analyzed. Based on the grayscale value of CT images, the freeze-thaw damage variable was defined. By introducing damage mechanics theory and Weibull distribution function, a constitutive model considering freeze-thaw damage was established. The following results were obtained: Freeze-thaw action causes a decrease in the peak stress of conglomerate, while the presence of a fissure weakens the strength of conglomerate. The deeper the prefabricated fissure, the more significant the weakening effect. Under freeze-thaw action, the failure mode of fissured conglomerate transforms from a single tensile failure to a complex tensile-shear mixed failure. Furthermore, the number of shear and tensile failure surfaces grows as the freeze-thaw cycle increases. Freeze-thaw action leads to a reduction in the number of pores, an increase in the number of throats, and an enhancement in pore connectivity, while the average grayscale value decreases with the increase in freeze-thaw cycle. After 60 cycles, the permeability of intact samples and those with 2 cm and 4 cm prefabricated fissures rises by 1.87%, 55.56%, and 183.90% respectively, and their grayscale values fall by 43.93, 50.96, and 73.53 respectively. The damage constitutive model considering freeze-thaw damage can accurately characterize the complete evolutionary process of conglomerate from deformation to failure under different freeze-thaw cycles, and can well describe its damage characteristics after freeze-thaw cycling. The research results can provide a reference for exploring the freeze-thaw damage mechanism of fissured rock masses on the Qinghai-Tibet Plateau.
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基本信息:
DOI：10.13532/j.jmsce.cn10-1638/td.2025-1442
中图分类号:TU45
引用信息:
[1]谭千千,温韬,王艳昆,等.冻融作用下裂隙砾岩宏微观损伤及本构模型研究[J].采矿与岩层控制工程学报,2026,8(04):198-216.DOI:10.13532/j.jmsce.cn10-1638/td.2025-1442.
基金信息:
西藏自治区科技资助项目(XZ202402ZD0001,XZ202601YD0002,XZ202301YD0034C); 国家自然科学基金资助项目(42477174); 青海省基础研究计划资助项目(2024-ZJ-904)
2025-11-27
2025
2026-01-05
2026-01-06
2026
1
2026-01-21
2026-01-21
2026-01-21