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通过3种应力路径的三轴试验,即同时控制吸力和净围压的12个三轴排水剪切试验、控制净平均应力的3个三轴收缩试验和控制吸力的3个各向同性压缩试验。对非饱和含黏砂土的强度、变形、屈服和水量变化特性进行了研究,得出如下结论:相同干密度,相同净围压作用下,吸力越大试样的剪切强度越大,剪胀性越强,应力应变曲线逐渐由应变硬化型向应变软化型转变;控制净平均应力时试样随吸力增大而屈服,不同净平均应力对应的吸力屈服点可以看作是一常数;控制吸力的各向等压的三轴试验随净平均应力的增大,不同吸力对应的屈服点的屈服强度逐渐增强。
Three triaxial tests of the three stress paths, 12 triaxial drainage tests simultaneously controlling suction and net confining pressure, three triaxial shrinkage tests for net mean stress and three isotropic compression tests for suction control . The characteristics of strength, deformation, yield and water content of unsaturated clay-containing sandy soil are studied. The conclusions are as follows: Under the same dry density and the same net confining pressure, the bigger the suction is, the bigger the shear strength is, The more the dilatancy, the stress-strain curve gradually changes from strain hardening to strain softening. When the net average stress is controlled, the specimen yield with the increase of suction force, and the suction yield point corresponding to different net mean stress can be regarded as a constant. Control The isokinetic isotropic triaxial test of suction increases with the average net stress and the yield strength corresponding to different suction gradually increases.