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通过在干土中加冰增湿的试验方法,进行了侧限压缩及三轴试验条件下的非饱和土增湿试验,得到重塑白河堡粉质粘土的干土-增湿-湿后全过程的应力应变曲线。研究结果表明:重塑击实粘土在同一围压下强度随含水量的增加而降低,应力应变关系也有明显不同,其强度和变形参数由应力水平和含水量决定。这一试验方法可望在不涉及非饱和土基质吸力的情况下,确定由任意应力增量及含水量增量而引起的应变增量,为非饱和土的本构模型提供了新的可能途径。
Through the test method of adding ice in dry soil, the tests of lateral compression and unsaturated soil wetting under triaxial test were carried out to obtain the wet soil of the remolded Baihe Fort silty clay Stress-strain curve of the process. The results show that the strength of remolded compacted clay decreases with the increase of water content under the same confining pressure, and the stress-strain relationship is also obviously different. The strength and deformation parameters are determined by the stress level and water content. This test method is expected to determine the strain increment caused by any increment of stress and increment of water content without involving the matric suction of unsaturated soils and it provides a new possible way for the constitutive model of unsaturated soils .