软土中结合水与固结、蠕变行为

摘要

采用宏观力学行为和微观结构定量分析相结合的方法，论文探讨了饱和软土中结合水对其固结、蠕变的影响。首先，采用SEM、压汞及最大吸水量等量测技术，对各级荷载下软土的孔隙级配进行了分析，并对淤泥土固结变形过程中微观结构变化特征进行定量研究，发现伴随着结构强度逐渐丧失和固结过程中不同类型孔隙水的排出，并对软土孔隙中的自由水及结合水进行了划分。其次，通过高压固结试验发现软土的固结过程明显存在两个阶段，前者主要与自由水有关，而后者则与结合水的行为有关。通过蠕变试验，分析了软土的黏滞系数η与结合水膜的厚度相关关系。%This paper discussed the influence of the bound water on the consolidation and creep behavior of saturated soft soil using the method combined the macroscopic mechanical behavior with quantitative analysis of the microstructure.First,measurement techniques such as SEM,mercury injection and the maximum amount of water absorption were applied to test the pore grading of the soft soil under different load levels,and the variation of the microstructure in the consolidation deformation process of the silt soil was quantitatively analyzed.It is found that a gradual loose of structural strength and discharge of different types of pore water occur in this process.The free water and bound water in the pore of the soft soil were divided.Then,the high pressure consolidation test reveals that there are two distinct phases during the consolidation process.The former is mainly concerned with the free water,whereas the latter has a close relationship with the behavior of the bound water.The correlation between the coefficient of viscosity ηand the thickness of water film in the soft soil was analyzed based on the creep test.