Scheme Comparison and Calculation of Stacker-reclaimer Track Beam Foundation Retreatment in a Wharf Yard

To ensure the running safety of stacker-reclaimer track beam in a wharf yard,based on the foundation treatment of vacuum combined with surcharge preloading method,the retreatment of foundation was necessary.Considered with the actual project conditions,the advantages and disadvantages of three different schemes of composite foundation retreatment,such as cement mixing piles,high-pressure jet grouting piles and CFG piles,were compared in this paper,and the composite foundation of high-pressure jet grouting piles was planned to be adopted.The stress-strain process of composite foundation of high-pressure jet grouting piles with different piles length,as 10m and 18m,was analyzed according to the numerical calculation.The results showed that the foundation settlement of track beam should be reduced from 37cm to 14cm,and the horizontal displacement should be reduced from 11cm to 7cm when the foundation retreatment of high-pressure jet grouting piles with piles length 18m was utilized,and the effect of foundation retreatment has significant to meet the project requirement.