Research on the Mechanism of Improving the Bearing Capacity of Steel Tube Columns by Injection Synchronization
Aiming at the problems of low bearing capacity of grouting steel pipe piles in marine soft soil areas,the influence of pile forming technology and pile shoe diameter on the bearing capacity of pile foundation is studied through full-scale tests of pile compressive capacity.A theory of simultaneous pile forming by pressure grouting to improve the bearing capacity of steel pipe piles is proposed.The results show that the pile shoe form and grouting sequence have a significant influence on the pile bearing capacity.The use of the pressure injection synchronization process combined with an enlarged pile boot is conducive to improving the stability of peripile soil-mortar consolidation.The compressive bearing capacity of the pile foundation can be significantly improved through pressure injection synchronous pile technology and structure.The test results were compared with the calculation results of compressive ultimate bearing capacity of current codes,and it was found that the measured ultimate bearing capacity of pressurized injection synchronous piles was about 1.2 times the calculated value.
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