岩土力学2025，Vol.46Issue(7)：2071-2084,14.DOI:10.16285/j.rsm.2024.1265
冻结钙质黏土复杂应力路径下的力学响应及本构模型研究
Mechanical response and constitutive modeling of frozen calcareous clay under complex multi-axial stress paths
摘要
Abstract
Calcium clay layers are widely distributed in the Huainan-Huaibei mining area,with the characteristics of low freezing point,strong frost heave,easy disintegration upon contact with water,and low strength,posing a severe challenge to construction using freezing methods.To investigate the mechanical response of frozen calcareous clay under complex stress paths,true triaxial compression tests were performed on the ZSZ-2000 frozen soil true triaxial test platform,varying confining pressures,temperatures,moisture contents,and intermediate principal stress ratios.The strength and deformation characteristics of frozen calcareous clay under these varying conditions were analyzed.The test results indicate that the strength of frozen calcareous clay has a good quadratic relationship with the intermediate principal stress coefficient b and confining pressure,is negatively correlated with temperature,and positively correlated with moisture content.Furthermore,the rate of increase in the failure strength of frozen calcareous clay decreases as the moisture content rises.The failure strength is significantly influenced by the intermediate principal stress and confining pressure,showing both strengthening and weakening effects.A critical intermediate principal stress coefficient of bc=0.75 and a critical confining pressure of σ 3c=3 MPa were identified.As the confining pressure rises,the volumetric strain gradually shifts from initial shear contraction followed by shear dilation to pure shear contraction.Moreover,as the b value increases,the peak volumetric strain of the samples also increases.Based on the experimental results,an improved Duncan-Chang model was developed,taking into account the effects of temperature,moisture content,and intermediate principal stress coefficient,and its reliability was verified.The research findings provide a theoretical foundation for optimizing frozen wall design and deep shaft excavation using freezing methods.关键词
冻结黏土/中主应力系数/强度演化规律/真三轴应力路径/邓肯-张模型Key words
frozen clay/intermediate principal stress coefficient/strength evolution law/true triaxial stress path/Duncan-Chang model分类
建筑与水利引用本文复制引用
曹祎,荣传新,王衍森,常磊,王彬..冻结钙质黏土复杂应力路径下的力学响应及本构模型研究[J].岩土力学,2025,46(7):2071-2084,14.基金项目
国家自然科学基金项目(No.51878005,No.52074264) （No.51878005,No.52074264）
矿山地下工程教育部工程研究中心开放基金(No.JYBGCZX2024103) （No.JYBGCZX2024103）
江苏省研究生科研与实践创新计划项目(No.KYCX24_2818) （No.KYCX24_2818）
中国矿业大学研究生创新计划项目(No.2024WLKXJ197) （No.2024WLKXJ197）
安徽省自然科学基金面上项目(No.2408085ME147).This work was supported by the National Natural Science Foundation of China(51878005,52074264),the Open Fund for Engineering Research Center of Underground Mine Construction,Ministry of Education(JYBGCZX2024103),the Postgraduate Research Practice Innovation Program of Jiangsu Province(KYCX24_2818),the Graduate Innovation Program of China University of Mining and Technology(2024WLKXJ197)and Anhui Provincial Natural Science Foundation(2408085ME147). （No.2408085ME147）
