Study On The Load Transferring Capacity Of Pile Group For The Frame-pier Wharf

It was stated the load-bearing mechanism and settlement calculation methods about rock-socketed pile group. Taking the wharf of Naxigou project and based on establishing the ideal calculation model on rock-socketed pile group by the means of 3-d finite element numerical simulation with ABAQUS, it was carried out the analysis on the influence factors of the bearing capacity of rock-socketed pile, those factors are pile length, pile diameter, the bedrock strength, rock-socketed depth, etc. The main conclusions as follows:(1) From the results of finite element numerical simulation, it can be obtained that the vertical settlement and horizontal displacement of central pile are respectively close to that of corner pile. It was shown that the efficiency of rock-socketed pile groups is not obvious.(2) The rigid cap-pile can supports vertical load joined with piles. The stress around the cap-pile is greater than that in the middle. The load bearing by the corner pile is more than that by the central pile.(3) Under the same load conditions, the more the diameter of both central and corner piles, the smaller the settlement of pile top, and in fall the settlement curve tended to a constant. When the pile diameter is to 1.8m, the influence was weakened. The settlement of both central pile and corner pile were zero gradually.(4) When the rock-socketed depth is less than 3D, the settlement and horizontal displacement of pile group are changed more; when the rock-socketed depth is more than 5D, the settlement and horizontal displacement of pile group respectively tend to constants. Increasing rock-socketed depth can effectively reduce settlement and horizontal displacement of pile group. If rock-socketed depth gets more than 5D, increasing rock-socketed depth will have no obvious improvement to stabilize pile group.