Study on Bearing Coefficient of Cement-Soil Pile Composition Foundation

Based on the results of static load tests, this paper presents an experience formula for calculating bearing capacity characteristic value of CSLSP (cement-soil long-short piles) composite foundation. Considering the settlement relationship among piles, the embedding soil and composition foundation, a method is proposed by studying on bearing coefficient of the embedding soil and suitable value of s/b (ratio of settlement of composition foundation to width of load board) . It is indicated that cement-soil piles have been destroyed firstly before soil in common and value of s/b have reached the upper limit. According to the results of static load tests and calculation, the upper limit value of s/b and bearing coefficient of the embedding soil for SP (single pile) composition foundation is 0.010 and 0.399, and decrease to 0.0052 and 0.318 respectively for CSLSP composition foundation when elastic model of cusion is 20MPa. It is also indicates that the upper limit value of s/b and bearing coefficient will decrease with the increase of elastic model of cusion.