Study on the Transfer Mechanism and Settlement of Long Piles in Differnet Strata

Based on the stastic tests' results of long piles in different strata, some conclusions about the load transfer mechanism and settlement of long piles under vertical loads are drawn. The settlement behavior of long piles in hard soil ground are simillar to the super-long piles in soft soil ground. The value of elastic compression of pile shaft are at a high proportion of the pile settlement, it should be considered in the settlement calculation. The ultimate capacity of end resistance and lateral resistance are not occurred in the same time under vertical loads. The ultimate capacity of lateral resistance are not occurred in the same time in different layers for a pile. We discussed the applicability of the ultimate bearing capacity formula of the Technical Code. At last,the authors point that the transfer mechanism and settlement of long piles' group foundation should be furher studied. And some important references for the theoretical research and technical application of super long piles are provided.