Experimental Study on Reduction Coefficient of Com pound Foundation Bearing Capacity of Cement-mixed Piles

<Technical code for ground treatment of buildings>（JGJ 79-2012）shows the calculation formula of compound foundation bearing capacity with reduction coefficientλandβ.In order to get the value ranges ofλandβwhich are suitable for this region and provide reference data for future code revision,it processes the reinforcement treatment of representative soft foundation in Kaifeng area by using cement mixing pile,and conducts 10 groups static load tests of single pile and single pile compound foundation.Through the analysis and inverse calculation of test data,it modifies the value ranges of the reduction coefficientλandβof bearing capacity calculation formula was given by the code.