不同应力路径下某高速公路路基黏性土湿化变形试验研究

Experimental research on wetting deformation of clayey soil of a freeway subgrade with different stress paths

针对某高速公路黏性填土路基浸水湿化的情况,进行了大量室内试验研究。为了研究土在实际应力路径下的湿化变形规律,分别在常规三轴应力路径、常规三轴K0固结应力路径、K0固结+常规三轴压缩应力路径以及使用真三轴仪的平面应变下K0固结+平面应变剪切应力路径和平面应变等应力比路径下进行了黏性土的湿化试验。通过对试验数据的分析,得到了湿化附加轴向应变与湿化时应力水平的幂函数关系。通过总结研究不同应力路径下应力-应变曲线的规律,提出了不同应力路径下的应力-应变关系的公式。

In order to consider the slaking deformation of the clayey soil of a freeway subgrade caused by wetting,a lot of laboratory tests of clayey samples were tested. For the purpose of finding out laws of wetting deformation of clayey soil along an approximate actual stress path. A series of tests along different stress paths were carried out in conventional triaxial apparatus,including conventional triaxial test stress path; conventional triaxial test＋K0 consolidation stress path; ＂K0 consolidation ＋ conventional triaxial test stress path＂. And test samples with the plane strain ＂ K0 consolidation ＋ triaxial shear＂stress path and plane strain constant stress ratio stress path were tested in true triaxial apparatus. By analyzing the experimental data,a power function is employed,to describe the relations between additional axial strain and stress level. By analyzing the stress-strain curves along different stress paths,some formulas are deduced.