The Analyses Of Finite Element Method On Pile Raft Foundation With Different Relation Between Pile And Raft Under Vertical And Horizontal Load

In recent years, with the wide use of pile-raft foundation in high rise buildings, new types of relations between pile and raft have also been developed in practice. These new types of relations between pile and raft aim at reducing settlement with minimum numbers of piles by means of increasing the percent of load carried by soil. In a word, these new types of structures can not only meet the requirement of bearing capacity and that of function, but also be a very economical means, thus, they have a very bright future in engineering practice.At present, most engineerings are carried out under the guidance of experience, and there is still no a set of theory that is widely accepted. On account of geology difference, the experience from small amount of engineerings can not be used widely, thus, it is the prime task for the researchers to make further understand of the theory of interaction between piles, cap and soil.In this paper, by means of finite element analysis soft ware ABAQUS, interaction between piles, cap and soil are studied. At first, models of single pile are maded to simulate the field test, in order to obtain the calculated results close to that of field tests, some parameters are adjustied. Then these parameters are applied in the numerical analysis of behavior of foundation (cap) -group piles-soil system under vertical and horizontal load. By changing the pile length, the pile spacing, the height of gap between pile head and raft, effects of these factors on the interaction between piles and soil are further investigated. Some ideas on design and construction of foundations are suggested based on the results form ABAQUS.