To make further research on the horizontal bearing capacity of caisson-pile composite foundation

the model tests on single pile and a series of caisson-pile composite foundations

under horizontal loads and the combination of vertical and horizontal loads in silty clay

are carried out. The relation between load and displacement

bending moments of pile shaft

lateral deflections of pile shaft and efficiency coefficients of group piles are investigated based on the model tests. With the constraint of caisson

the bending moments

displacements and soil resistance of pile shaft under the horizontal loads

can be reduced than the single pile without constraint; the horizontal bearing capacity of composite foundation can be improved. Under the vertical and horizontal combination loads

friction under the caisson bottom and vertical force on the pile top is also conducive to further improve the composite foundation bearing capacity. The efficiency coefficients of caisson-pile composite foundations with different pile numbers

constraint conditions on the pile top and loads on caisson are also obtained. For the case of pile distance is 6 times of the diameter

the mutual influence between each other pile is very small.