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Research on Soil Squeezing Effect of Pile Sinking of PHC Pile for Subgrade of High—speed Railway |
LEI Yu,ZHANG Zhen,KONG Qing—zhe |
China Communication Construction Company Ltd.,Suzhou,Jiangsu 215122,China |
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Abstract Research purposes: In order to monitor the change of pore water pressure,the displacement of deep soil body and the elevation of the elevation of the pile top in the process of the construction of pretensioned prestrssed pipe pile of roadbed around the Hongqiao Station of Hongqiao integrated transportation hub in Shanghai for well knowing the effect of the process of pile sinking on soil squeezing against the soil body around the pipe pile,the research was done on the specific measures for effectively reducing the soil squeezing effect for the purpose of controlling and reducing the effect of the pile sinking against the surrounding soil structure.
Research conclusions: The monitoring result proved that the distance to the pilling area Was shorter and the effect of soil squeezing was bigger,the accumulated growth of super pore water pressure Was bigger.The depth WasS deeper,and the accumulated growth of super pore water pressure was bigger.By the monitoring of the super pore water pressure and the displacement of deep soil body,the construction speed and sequence were adjusted for the pile base construction.The soil squeezing of pipe pile Was obvious because the main direction of displacement was the reverse direction to the pilling.Therefore,before the placing of pile,the measure of deviation was taken to minimize the influence of the piling against to the existed pile.In the area where needs to control the soil body dispacement,the piling speed and the direction weFe strictly controlled,and at the same time,skip—piling technique was used to effectively reduce the soil squeezing by piling.
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Received: 23 February 2010
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