饱和软黏土三轴强度指标 ccu 与 φcu 的力学本质及工程应用
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中图分类号：TU443 文献标志码：A 文章编号：2095-1329（2025）02-0038-09
Abstract： For the undrained shear failure of saturated clay，designing methods based on the strength parameters of ccu and φcu obtained by thetriaxialconsolidated-undrainedsheartest（CUtest）weredeveloped indomesticengineeringfield.Incontrast，the φ=0 method with the total strength Su is commonly used internationaly.Based onthe mechanical intrinsityof Coulomb's lawoffriction and the Mohr circle analysis method insolid mechanics，it waspointedoutthatthe strength envelope and thecorrespondingstrength parameters （ccu， （20 （204号 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 regardedas the dependency of total strength Su on the effective consolidation stress σc′ . 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 principleofthis methodindomesticresearchers wereclarifed.Basedonseveralanalysis examplesofslopestabilityearth 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.
Keywords：saturatedcla;raxialonsolidated-udraedsearest;trengthparameter;Mo-Coulobtrengthiteriototatr analysis method
库仑摩擦定律以及在此基础上建立的莫尔-库仑强度准则广泛应用于岩土材料的剪切破坏分析。（剩余18798字）