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以江西非饱和红土为研究对象,分别进行了相同压实度下24个试样的非饱和红土固结排水和常含水量GDS三轴试验,对比分析了2种试验方法下试样的应力变形及强度变化特性。结果表明:固结排水三轴试验与常含水量三轴试验在高围压同基质吸力下有不同的应力应变关系,而在低围压下却大致相同;在常含水量三轴试验中产生了剪胀现象,而在固结排水试验中并未出现此情况;常含水量三轴试验中与基质吸力有关角度Ф~b总体均小于固结排水试验中的Ф~b。为红土填筑工程、变形及稳定性分析提供试验选择参考。
Based on the unsaturated red soil in Jiangxi Province, the GDS triaxial tests of the consolidated drainage and the water content of unsaturated soils in 24 samples under the same compaction degree were carried out respectively. The stress and strain of the samples under two kinds of test methods And intensity change characteristics. The results show that the triaxial tests of consolidated drainage and the normal water content have different stress-strain relations under high confining pressure and substrate suction, but are similar at low confining pressure. In triaxial tests with normal water content, The phenomenon of dilatancy was not observed in the consolidation drainage test. The angles Ф ~ b in the triaxial tests of the normal water content and the substrate suction were all less than those in the consolidation drainage test. For the red earth fill construction, deformation and stability analysis to provide test selection reference.