Load Transfer And Bearing Capacity Of High-cap Pipe Pile

High cap pipe piles partly exposed in the air were firstly used in the construction of Tianjin coastal port, where the short of land resources made backfill soils in short supply. How to ascertain the horizontal resistance characteristic of these pipe piles was a challenge in engineering practice. Given the strong correlation between structural design and lateral load transfer properties, foundation anti-bending capacity and the overall Stability, the force character research on high cap pipe piles under lateral load, which are firstly used in the second phase project of Tianjin Baoshui Port district, is presented through ABAQUS in this paper. The analyzes are as follows:1. Timeliness of force character research on high cap pipe piles.2. The numerical simulation analysis of high cap pipe piles under horizontal load in different pile lengths, diameters, elastic modules, sorts of soils and different exposing heights, then this results is compared with low cap pipe piles.3. With the established model of triangle distribution on pile groups, analysis of the horizontal displacement, soil resistance forces before or after the piles, and the vertical displacement of soil surface on each piles.Main conclusions obtained through the numerical analysis are as follows:1.The capacity of high cap pipe piles increases with time, we can research a timeliness of capacity formula according to the numerical analysis.2. From an engineering point of view on economic, we can make 1.7m as the critical height according to the numerical analysis, because the 1.7 m exposing height is a comprehensive inflection turning point of the force performance and cost-effective.3. Increasing the soil strength,the modulus and diameter of piles could contribute to ultimate horizontal bearing capacity, while changing the length has little influence.4. It makes the piles discontinuity because of the pile group effects, the resistance force is small before or behind the soil , and the piles in the front have a smaller share of the load level as the horizontal displacement is smaller; The horizontal effects is smaller than the vertical between the pile interactions during the horizontal loads in the pile groups.