Analysis of load-bearing mechanism of composite foundation of plain concrete reinforced cement-soil mixing piles

Plain concrete reinforced cement-soil mixing pile(MC pile) is a new kind of composite pile,which is made of semirigid cement-soil mixing pile(M pile) and rigid plain concrete pile(C pile). The diameter of M pile is 500-700 mm; the diameter of C pile is 220-280 mm; and C pile constructs in the center of M pile before it congeals. This composite pile can exert the carrying capacity of soil,improve load pipeline and depth,control the advance extent by adjusting diameter,intensity of concrete,and so on; so it has been widely used along river and sea in Jiangsu Province. The pile's working property and load-bearing mechanism are analyzed based on the plate loading test,stress test,and ABAQUS software. Compared to general reinforced mixing pile,MC pile works as a kind of composite foundation. Stress centralizes C pile and rapidly diminishes along with depth; and the stress in the end of pile is close to zero. MC pile exerts the carrying capacity of soil around the pile,because C pile can transfer load to cement-soil mixing pile. MC pile doesn’t penetrate into cement-soil mixing pile like general reinforced mixing pile; for the capability of C pile is more close to cement-soil's.