Experimental Study On Load Transfer Mechanism Of Reinforced Mixing Pile

Reinforced mixing pile is formed by driving a rigid core pile into the center of the cement mixing pile right after the cement mixing pile being constructed. The joining of the core pile improves the rigidity of the cement mixing pile and the bearing capacity of the section. It can effectively make use of the skin resistance of cement and the strength of the concrete. So we can get higher bearing capacity from reinforced mixing pile than from concrete pile, at the same time, we cost less. Results of many projects have revealed that the type of pile had a series of advantages, such as, higher capacity, lower cost, more reliable quality, simple construction techniques and lighter pollution.Based on the field static loading tests on two reinforced mixing piles with stain gauges, the Q-S curves, the axis force of pile body curve, the skin resistance of all soil layers and the failure model were studied in this paper. Then load transfer mechanism and action of skin resistance were analyzed. Based on this test and the former tests information, this paper analyzed some problems of reinforced mixing pile, and advanced corresponding suggests. According to experiences of design,field experimentation and construction, this paper discusses the failure mode of reinforced mixing pile, and brings forward the optimization design method of reinforced mixing pile. This paper presented two projects, and made economic compare simply. Finally, the works for further research are identified.Above-mentioned research findings can provide references for engineering application and further study of the reinforced mixing pile.