Research On Mechanical Characters Of Soil Treated With Static-Dynamic Drainage Consolidation Method By The True Triaxial Tests

Static-Dynamic Drainage Consolidation Method is widely used in engineering practice of the saturated soft clay foundation, but the application of this technology is still at the experience accumulation stage. There is not a mature theory and design method. Especially, there are very few achievements about the characters of saturated soft clay foundation under impact loading. This regarding should vigorously strengthen. It has important theoretical significance and practical value for the enrichment and development of the theory of treatment soft foundation, to optimize the design and guide the on-site construction.The finite characteristic ratio, which is the ratio of a material internal characteristic measurement to the material external characteristic measurement, is a basic phenomenological variable which is put forward by Zhangming Li. The theory of the finite characteristic ratio method can character material irreversible deformation. It can be also used to character stain localization. In this thesis, the finite characteristic ratio theory (FCRT) constitutive model is established to character the deformation of specimen, and compared with the experimental results.Using true triaxial tests to simulate the static-dynamic consolidation method, and research on the regularity of the mechanical response such as the impact of stress, pore water pressure and soil deformation changes during the process. The work involves several aspects as follow:1、Research the course of development of the static and dynamic consolidation drainage method to understand the mechanism. Sum up the work done by domestic and foreign scholars on the soft clay consolidation mechanism, just as numerical analysis, theoretical research and engineering applications. And discuss the characteristics of the work, so that we have a reference and basis for comparison.2、Application of SPAX-2000true triaxial test system (improved type) simulating the Static-Dynamic Consolidation Method deal with fine sand and silt soil. The tests adopt different consolidation condition and loading frequency. Researching on the regularity of the mechanical response such as the impact of stress, pore water pressure and soil deformation changes during the process. After this, do the shear tests and analyze the change of specimen strength characteristics.3、Comparing the results between the finite characteristic ratio theory (FCRT) constitutive model and the tests, it is founded that the results and their curves is consistent.