Analysis on the Settlement and Characteristics of Pile-soil Stress for Composite Foundation under Water Preloading
Taking T3 section of a highway in Guangdong province as the research object,in some sections,the prefabricated piles composite foundation is used to strengthen the soft soil foundation.which used the water bag loading method for equal load pre-pressure,three typical detection sections are selected to embed sensors to monitor and analyze the foundation soil and pile settlement,soil pressure and pile axial force change rule.The results show that the pile body is the main loaded body in the composite foundation,and the setting of bedding layer can make it produce stabbing deformation to effectively mobilize the bearing capacity of foundation soil.There is a hysteresis in the load transfer in the foundation,and the load transfer rate can be improved by increasing the loading rate,the graded loading can help to achieve a better pre-compression effect.Too large loading rate will lead to the fluctuation of soil pressure and pile axial force,and the pile and soil jointly bear the upper load through load redistribution.By using water-loading preloading combined with prefabricated pile composite foundation to treat soft soil subgrade,it can not only reduce the construction cost by 30％,but also effectively improve the stability of the foundation after construction.
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