Soft Soil Modification Pattern And Its Non-linear Finite Element Of Characteristic Analysis

Our country is vast in territory and the geological environment is complicated. Therefore, the geological conditions of the project are of diversity in different areas. All kinds of weak grounds are distributed widely, and the regionally is very obvious. So ground treatment should be conducted in terms of the local actual conditions.Through indoor routine tests, the physical and mechanical natures of intact and remolding soil of muck and mucky soil, in Fuzhou, are analyzed in this thesis. The results reveal that water content, void ratio, shear strength of remolding soil samples are lower than those of intact samples. Then qualitative analysis on the mineral composition, chemical composition and microstructure characteristic and types of the soft clay is given.Match ratio tests are done by using cement and fly-ash as curing agent, which include making soft clay with different water content into different mixing ratio cement-stabilised clay, and mixing cement and fly ash to make different cement-fly ash stengthened clay to soft clay with ascertaining water content. Afterwards unconfined compression strength is tested at different curing age. The microstructures and mechanisms of cement soil and cement-fly ash soil are studied by mean", of X-ray and scanning electron microscope(SEM) technology. The influences of the mixing amount of curing agent and curing age on the unconfined compression strength are discussed by determining the strength. By comparative study, it is concluded that the intensity of stabilized soil is the largest by using the stabilizer composed of 16% cement mixing ratio and 40% fly ash mixing amount, and it is reduced with growth of the water content of soft soil and is increased with growth of the cement mixing ratio and curing age.Based on nonlinear finite element theory, stress and deformation behaviors are analyzed after ground stabilization and foundation pit reinforcement with deep mixing method. By comparison of the conditions of treatment and non-treatment of two examples respectively, the results indicate that the match ratio scheme used for deep mixing method is more ideal when soft clay is stabilized in this area of Fuzhou in the thesis. This scheme not only can fully utilize industrial waste material, but also can economize construction cost.