Study Of Stability In The Trestle Of Box And Bucket Foundation

As a new type of port and ocean engineering structure, structure of box and bucket foundation was used in breakwater of Tianjin harbor, but there is no standard or criterion for design and related research results are also less. Nowadays, build of structure of offshore road-island has problems in design, construction difficult, long construction period and other issues. And it needs study of standard of design and construction to satisfy rapid, efficient development of offshore oilfield. This paper, with the engineer in Chenghai oilfield Zhangdong development zone as the engineering background, using FEM program PLAXIS to study the forces of trestle structure of box and bucket foundation, conclude method that can guide construction design and worthful.Firstly, this paper using geotechnical engineering FEM program PLAXIS to simulate physical size model of the engineer in Chenghai oilfield. And in different work conditions analyze earth pressure on lateral cylinder and foundation stress under the structure to find the failure mechanism of stability of structure of box and bucket foundation.Secondly, for the weak geological soil condition and the future structure of the deep sea trestle trend, the influence on bearing capacity of thickness of first layer soil, soil parameter of second layer soil, diameter of the structure and embedded depth of structure are analyzed.Finally, write FORTRAN program to get force to compare with algorithm accepted in engineering. And modify it to apply in trestle structure of box and bucket foundation and the weak geological soil condition.This paper conclude algorithm to guide construction design by theoretical analysis and numerical computation. By testing with trestle structure in Chenghai oilfield Zhangdong development zone, this simplify algorithm is worthful.