冻融循环作用下灰岩和石英岩力学特性及损伤本构模型试验研究  

Experimental Study on the Mechanical Properties and Damage Constitutive Models of Limestone and Quartzite under Freeze-Thaw Cycles

作　　者：刘先峰[1,2,3] 王通 李建国 袁胜洋[1,2] 侯召旭[1,2] 张俊[1,2] LIU Xianfeng;WANG Tong;LI Jianguo;YUAN Shengyang;HOU Zhaoxu;ZHANG Jun(School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;Key Laboratory of High-Speed Railway Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu Sichuan 610031,China;School of Civil Engineering,Xinjiang Institute of Engineering,Urumqi Xinjiang 830023,China;School of Railway Engineering and Electricity,Sichuan Railway College,Chengdu Sichuan 611732,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031 [3]新疆工程学院土木工程学院,新疆乌鲁木齐830023 [4]四川铁道职业学院铁道工电学院,四川成都611732

出　　处：《中国铁道科学》2025年第1期1-14,共14页China Railway Science

基　　金：国家自然科学基金资助项目(52078432,52168066);新疆维吾尔自治区自然科学基金青年基金资助项目(2022D01B134);中央引导地方科技发展专项资金资助项目(ZYYD2023B02);中铁第一勘察设计院集团有限公司科研项目(院科20-06)。

摘　　要：针对季冻区岩体工程中岩石的冻融劣化问题,选取具有代表性的灰岩和石英岩为试验对象,通过冻融循环试验、单轴压缩试验以及SEM扫描电镜试验对岩石的孔隙率、宏-细观破坏特征、力学特性以及能量演化规律进行研究。根据典型岩石的应力-应变曲线,基于Lemaitre平面应变理论和统计理论,将冻融循环作用产生的损伤效应耦合到损伤本构模型中,考虑压密段的影响,根据岩石的损伤本构方程和试验曲线特点分2段拟合本构方程。结果表明:冻融循环作用更易加剧高孔隙率灰岩的风化;随着冻融次数的增加,灰岩和石英岩的抗压强度均服从指数衰减;模型曲线的峰值点与试验曲线的峰值点较为接近,分段损伤本构模型与试验得到的曲线吻合较好,该损伤本构模型以及参数选取是正确可靠的。To address the issue of freeze-thaw deterioration of rocks in seasonal frozen regions,representative limestone and quartzite were selected as test subjects.The study involved freeze-thaw cycle tests,uniaxial compression tests,and SEM(scanning electron microscope)tests to investigate the porosity,macro-mesoscopic failure characteristics,mechanical properties,and energy evolution laws of the rocks.Based on the characteristics of the stress-strain curves of typical rocks,the damage effects induced by freeze-thaw cycles were coupled into the damage constitutive model using Lemaitre’s plane strain theory and statistical theory.Considering the compaction stage,the constitutive equation was fitted in two segments according to the characteristics of the rock’s damage constitutive equation and experimental curves.The study showed that freeze-thaw cycles more easily exacerbate the weathering of high-porosity limestone.As the number of freeze-thaw cycles increases,the compressive strength of both limestone and quartzite follows an exponential decay.The peak points of the model curve are in close agreement with those of the experimental curve,and the segmented damage constitutive model fits the experimental curve well.This indicates that the proposed damage constitutive model and the selection of parameters are correct and reliable.

关 键 词：岩石工程 冻融循环 力学特性 能量演化 损伤本构模型 

分 类 号：TU452[建筑科学—岩土工程]