Study On The Law Of Change Of Tianjin Soft Soil Index With Consolidation Process

The soft soil foundation in Tianjin has distinct regional characteristics,and its physical and mechanical indicators are very important for the overall stability and settlement deformation of the overlying buildings.In the construction process of breakwaters,cofferdams,wharfs,dredging works,etc.,stability and settlement analysis are important contents.The analysis of the influencing factors of consolidation settlement of soft soil foundation and the establishment of numerical model of soft soil mechanical index with time can make reasonable planning for building construction and have important guiding significance.The statistical study on the correlation and distribution of physical and mechanical properties of Tianjin marine soft soil is carried out.Taking the marine soft soil foundation in Tianjin as the research object,collect and sort out a large number of survey reports and laboratory test data for regularity analysis.The irrationality of the strength index judgment is summarized.It is pointed out that in the study of foundation settlement,the changes of factors such as material nonlinearity and permeability coefficient cannot be ignored.By regression fitting the physical and mechanical indexes,the correlation between some mechanical indexes of soft soil is obtained,which lays a foundation for nonlinear analysis of consolidation and settlement of soft soil foundation.A soft soil consolidation analysis model was established using the finite element software ABAQUS.The nonlinear consolidation settlement process of soft soil under simulated self-weight is studied,and the influence law of various related factors is studied.Based on the correlation between the physical mechanics index and the field variable and the empirical formula,the subroutine is written to implement nonlinear consolidation simulation of the soft soil layer using ABAQUS.The numerical model is corrected and improved by comparing the numerical simulation with the measured settlement-time history curve and the void ratio-depth curve.Based on the established numerical analysis model,the nonlinear consolidation and stability analysis of the cofferdam structure and foundation of Dongjiang Port,Tianjin were carried out.Through numerical simulation analysis,the influence of the drainage board on the degree of consolidation of the soft soil foundation and the stability of the overlying building structure can be considered.According to this,the slope section size can be optimized,and the most economical cofferdam construction plan and construction progress are given.