Study On Model Test Of Composite Pile Foundation With Long And Short Piles

Based on the controlling settlement principle, the design theory of long-shot pile foundation is presented. The long pile is to control the settlement and short pile to provide bearing capacity. Compared with conventional design theory, the long pile's capacity of controlling settlement and the bearing capacity of the lower bearing strata are fully utilized, according to the design theory of long-shot pile foundation.The long-shot pile foundation is a new type of foundation. There are too many problems that are not researched, and the design theory and calculation method haven't come into being. In view of the above, the following research works have been carried out in this paper:Firstly, the theory of pile foundation are consulted in this paper, the research actuality of pile foundation are stated, and the design theory of long-shot pile foundation is presented;Secondly, carried out a model test of long-shot pile foundation in the key laboratory of geotechnical engineering of Tongji University. the working performance of long & short piles have been tested in this test;Finally, presented a settlement calculation method based on the characteristic of the long-short pile foundation, taking into account the concept of elastic theory and layered-summation method, and analysed it in contrast with the result of model test.