不同含水率砂岩冻融力学特性及损伤模型研究

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中图分类号：TU445 文献标志码：A 文章编号：1008-0562（2025）04-0430-10

Study on freeze-thaw mechanical properties and damage model of sandstone with differentwatercontent

LIANG Yong

（ChinaRailway19th Bureau Group Sixth Engineering Company Limited，Wuxi 2140oo，China）

Abstract：To study theeffectsoffreeze-thawcyclesonsandstone'sphysicaland mechanical properties，freezethaw cycle tests and uniaxial compression tests with different numbers offreeze-thaw cycles were carried out on sandstone with different water content.Based on the theory of rock damage mechanics，a coupled frost-thaw-load damage model of sandstone was established，and the model's reliability was verified with experimental results. The results show that as the number offreeze-thaw cycles increases，sandstone produces cumulative freeze-thaw damage，decreasing sandstone strength and increasing deformation.Thechange in the total damage value of the freeze-thaw-loaded rock shows an overall “S”trend.This proves that this damage model can beter describe the adaptability of the mechanical properties of the loaded freeze-thaw sandstone.The research results can provide a reference for preventing and controlling freezing disasters of tunnel engineering in cold areas.

Keywords： freeze-thaw damage； freeze-thaw cycles;physical property；mechanical properties；damage modelcold; regional tunnel

0引言

季节性冻土区（简称季冻区）的岩石与土壤的力学性质、强度指标、变形特征和热稳定性等在冻结与融化两种状态下存在显著差异[1-2]。（剩余15420字）