固结排水及常含水量条件下非饱和红土强度及变形特性影响

Study on the influence of the strength and deformation characteristics of unsaturated clay under the condition of consolidated drainage and constant water content

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。

By using the aim of unsaturated red clay of Jiangxi Province. GDS triaxial tests of unsaturated clay consolidated drained and constant water content of 24 samples were carried out with the same degree of compaction.The stress deformation and the strength of the specimen under the two test methods were compared and analyzed.The results showed that the stress-strain relationships were different of consolidated drained triaxial tests and the constant water content triaxial tests under high confining pressure and the same matrix suction,while they were same under low confining pressure. In the constant water content triaxial tests,the phenomenon of shear dilation was produced,which was not found in the consolidated drained tests. The of the constant water content triaxial test with the matrix suction was less than that of the consolidated drained test to provide experimental reference for the engineering,deformation and stability analysis of the clay.