Experimental study on behavior of composite foundation with rigid-flexible piles

In order to study pile-soil interaction of composite foundation with rigid-flexible piles,static load test of composite foundation with one cast-inplace pile and four cement mixing piles under stripe foundation is carried out in Wenzhou area.On the basis of monitoring data,this paper analyses load bearing capacity and deformation under the application of load.The Q-s curve variation of composite foundation is slow.Soil pressure distribution under stripe foundation shows the shape of being large in middle part and small at the edge.The soil stress concentration occurs at the plane of pile tip.There are negative friction force at rigid pile top and flexible pile top.Furthermore,the degree of bearing capacity display on rigid pile is 0.97,while that on flexible pile is 0.73 and that on soil is 0.99.