上海国土资源2025，Vol.46Issue(2)：38-46,64,10.DOI:10.3969/j.issn.2095-1329.2025.02.006
饱和软黏土三轴强度指标ccu与φcu的力学本质及工程应用
Mechanical intrinsity and engineering applications of triaxial strength parameters ccu and φcu
摘要
Abstract
For the undrained shear failure of saturated clay,designing methods based on the strength parameters of ccu and φcu obtained by the triaxial consolidated-undrained shear test(CU test)were developed in domestic engineering field.In contrast,the φ=0 method with the total strength Su is commonly used internationally.Based on the mechanical intrinsity of Coulomb's law of friction and the Mohr circle analysis method in solid mechanics,it was pointed out that the strength envelope and the corresponding strength parameters(ccu,φcu or the transformed parameters ccq,φcq)obtained by the triaxial CU test do not have the intrinsic nature of Coulomb's law of friction and it is prefer to be regarded as the dependency of total strength Su on the effective consolidation stress σ'c.The advantages of the application of the φ=0 method in practice and the principle of determination of total strength Su were discussed,and the misleading of the mechanical principle of this method in domestic researchers were clarified.Based on several analysis examples of slope stability,earth pressure and foundation bearing capacity,the problems caused by mistaking the ccu and φcu as the Coulomb's strength parameters in practice were discussed in detail.关键词
饱和软黏土/三轴固结不排水剪切试验/强度指标/莫尔-库仑强度准则/总应力分析法Key words
saturated clay/triaxial consolidated-undrained shear test/strength parameter/Mohr-Coulomb strength criterion/total stress analysis method分类
建筑与水利引用本文复制引用
高彦斌..饱和软黏土三轴强度指标ccu与φcu的力学本质及工程应用[J].上海国土资源,2025,46(2):38-46,64,10.基金项目
国家自然科学基金面上项目(41972273) （41972273）
