Soft Soil Foundation Settlement Regularity And Forecasting Method

The thesis is based on leshan-yibin highway yibin section, through analyzing the cause of ravine soft soil foundation with soil distribution characteristics of plastic drainage plate, the choice method of dealing with the soft soil foundation;this paper gives detailed descriptions of the soft soil subgrade test plan (including the surface settlement and lateral horizontal displacement and pore water pressure and soil pressure) and observation methods, and the field observation results are analyzed, and the results show that:Ravine soft foundation in outer loads vertical compression, lateral expansion phenomenon, but the soft base after grille and plastic drainage plate after comprehensive treatment, the outer loads of soil lateral extrusion is reduced, namely the lateral deformation resistance ability enhancement; With the load increasing, the pore water pressure and soil pressure increases, when the load with increased to a certain extent, pore water pressure decreased gradually dissipate, soil pressure increases more slowly, and stabilize early. Visible plastic drainage plate ravine method of soft soil foundation high to deal with good effect and improves the soft soil subgrade stability and loading capacity.In order to seek soft soil subgrade settlement process of deformation, this paper through the soft soil subgrade settlement mechanism and regular analysis, by using grey system method, the index curve method and hyperbolic method to establish the prediction model respectively, the soft soil subgrade settlement process is forecasted, and the result indicates that the gray system method and exponential curve than hyperbolic method, can better meet method to predict the experimental data of roadbed future sedimentation value has great value of reference. Meanwhile, by using grey system method of the final settlement quantity prediction obtained than hyperbolic method, exponential curve method predicted value big, which shows that this method is the prediction that tends to safety, showed the requirements of settlement after more strict.