Abstract:Concrete-cored DCM pile has the characteristics of high bearing capacity, low cost and convenient construction. To Provide effective scientific theoretical basis for engineering design, construction and testing of Concrete-cored DCM pile, and promote its development and application, the field load tests and MIDAS numerical simulation were used to study the vertical bearing behavior of its single-pile. The effects of core length ratio, core ratio, and core piles with different elastic moduli on their vertical bearing behavior were discussed, and the ultimate bearing capacity of Concrete-cored DCM pile was predicted based on the Weibull model. The results showed that: (1)the bearing capacity increases with the growth of the core length ratio and finally reaches stability. Comprehensive analysis shows that the optimal core length ratio is about 0.722; (2)in general, the larger the core content is, the higher its bearing capacity is and it tend to a stable value. Fully considered results illustrated that the optimal core content is about 0.204; (3)the elastic modulus of the inner core pile has little influence on its bearing capacity, that is to say, the inner core pile can meet the requirements with C15 or C20 concrete; (4)based on Weibull model, the whole effect of predicting the ultimate bearing capacity of Concrete-cored DCM pile is better, which proves its scientificity and correctness, and can provide some reference for the engineering practice.