Abstract
In order to study the influence of design factors of capped pipe pile composite foundation on differential settlement of expressways, using a geotechnical centrifugal model test platform, a centrifugal model of widen roadbed has been constructed. The effects of pile length, pile spacing, pile cap and cushion thickness on differential settlement were analyzed through comparative experiments. The test results show that increasing the pile length, pile cap size and cushion thickness can effectively control the differential settlement between old and new embankments. The research results can provide a theoretical basis for the design of composite foundations with capped pipe piles.
Highlights
The efficiency and advantages of the pipe pile composite foundation have been recognized in the construction engineering and it has been applied in the flexible foundation such as embankment.Some scholars have carried out researches on this problem
On the basis of previous studies, the centrifugal model test of composite foundation with capped pipe pile is established and the monitoring means are upgraded to analyze the influence of design factors such as pile length, pile spacing, pile cap size, cushion material and thickness on the settlement of composite foundation, which will provide a basis for the design of pipe pile composite foundation
From the results of the test, we can know that increasing pile length,can effectively control differential settlement while reducing pile spacing can achieve a good effect
Summary
The efficiency and advantages of the pipe pile composite foundation have been recognized in the construction engineering and it has been applied in the flexible foundation such as embankment. Zou Yongqiang [1] analyzed the working behavior of rigid pile composite foundation and the factors affecting its settlement, based on which, he found there are problems in the study of the working behavior of rigid pile composite foundation. The relationships among design parameters such as pile length, pile spacing and pile cap size are studied by Lei Jinbo[7] and he put forward the optimum design. On the basis of previous studies, the centrifugal model test of composite foundation with capped pipe pile is established and the monitoring means are upgraded to analyze the influence of design factors such as pile length, pile spacing, pile cap size, cushion material and thickness on the settlement of composite foundation, which will provide a basis for the design of pipe pile composite foundation
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