A Consolidation Model of Soil Dealt with the Variation of Consolidation State

摘要

The paper deals with the model about nonlinear consolidation phenomena. Stresses history of soil have a great influence on soil consolidation properties. Under external loads soil properties will change from over to normal consolidation regimes. Considering the impact of the stress history on consolidate characteristics of different depths foundation soil, according to different drainage conditions and the actual distribution of load and weight stress along the depth, a consolidation model has been developed, which can describe the consolidation phenomena of over-consolidation ratio changes with the soil depth and in a horizontal homogenous clay changing from an over to a normal consolidation regime. The equation of the model has been solved by use of numerical method. And consolidation curves of different depths clay also have been obtained. In this paper it has been analyzed that some parameters, such as the load size and soil pre-consolidation pressure etc, have a significant effect on the characteristics of soil consolidation. The results show that the dissipation of excess pore water pressure is faster with larger load on the ground. Therefore the over-consolidated soil is more easily changed into a normal consolidation. If τ is denoted the relationship between final effective stress and original effective stress, the time for soil to consolidate is longer with larger τ.