Engineering Property Of Soft Soil And Soft Foundation Improvement, Huanghua Port

This thesis presents the analysis of engineering property of soft clay from Huanghua Port, comparison with soft clay from Tianjin Port and application of two ways to improve soft foundation.Based on engineering geological datum from construction for eleven years, such features as genesis, particle fraction, classification of plastic chart, structure, distribution, stress history, vane-shear test strength Cu and evolvement trend of diversified physical and mechanical index with depth of soft clay from Huanghua Port are be described by geological analysis and mathematical statistics. The curves ofτvs. p and e vs. p are plotted herein. By synthetic study, the standard value of shear strength index, strength gaining formula, simplified equation for settlement estimate, correlations among physical indexes, physical and mechanical indexes are also given in the thesis.①Huang Huagang the soft soil has the model the soft soilcharacteristic: The high water content, is high raito, the highcompression, the low intensity and the low permeability. Soft soilpellet ingredient by silt and clay primarily, silty soil band byextremely fine-grain and silt primarily. The soft soil belongs to ~high sensitivity, ultra solidifies, the inorganic clay soil.②Huang Huagang soft soil four-bladed vane shearing strength Cu anddepth H assumes the linear relations: Cu=3.94H+3.84.③In the article through to the natural target, the intensity target aswell as the distortion target along the depth distribution or thechange situation analysis, draws the conclusion: 0m ~ 6m first marinefacies deposit formation, natural target distributed scope big, theseparate is big, showed the nature of the soil is unstable, changes ina big way, the intensity target assumes the enhancement tendency alongthe depth, the earth compression assumes reduces the tendency; 6m ~12m second marine facies deposit formation, natural target quitecentralized, separate smaller, the explanation nature of the soil isstabler, its intensity and the compression target are not big alongthe depth change.④Huang Huagang the soft soil solidifies the index, the snapping backindex and the natural ratio: Cc/ (1+e0), Cs/ (1+e0) alongwith the depth change, is not one: Cc/ (1+e0) =0.155; Cs/(1+e0) =0.0155. Thus, its subsidence formula may simplify is:Compared with soft clays, the result is shown that the engineering property of soft clay from Huanghua Port is superior to Tianjin. Otherwise, these soft soils have the same basal attribution. Therefore, various favorable experiences in soft foundation improvement from Tianjin port can be adopted in Huanghua. In particular, the application of two subsoil treatment approaches of vacuum dewatering consolidation and soil-cement processing to soft soil from Huanghua is demonstrated by treatment effect analysis.