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Abstract To research the influence on pile bearing capacity after base grouting in Suramadu Strait area of Indonesia，the static load tests on four test bored piles of Suramadu Strait Bridge are conducted before and after base grouting under compression. The long-distance displacement sensors and strain gauges are adopted. Consequently，the pile displacement and axial stress along the shaft are obtained. Based on the test results，the comparative analysis of bearing properties of piles before and after base grouting are made. The test results show that after grouting，the tip resistances increase by 24.70%–40.98%；the lateral frictional resistances increase by 9.2%–32.1%，and the ultimate bearing capacities of piles increase by 16.61%–33.65%. The base grouting effects of piles are obvious. Because of poor penetration ability of soil in this area，not only tip resistances are improved after grouting，but also lateral frictional resistances are improved. By comparing lateral frictional resistances along pile shaft，it is found that the slurry penetration height along the shaft has a certain range. The result indicates that the quantity of mortar intrusion has more influences on the slurry penetration height than grouting pressure on it. Therefore，the quantity of mortar intrusion should increase appropriately in practical engineering design. The research results have been directly applied in the design of bridge foundation and can provide references for similar projects.
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Received: 29 January 2010
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2011, Vol. 30 
