Numerical Simulation And Optimization Research Of Pile-Raft Foundation

With continuous improvement of the economic construction capacity,the development of high-rise building also shows a rapid growth trend.The pile-raft foundation is widely used in high-rise buildings because of its excellent performance in bearing capacity,anti-overturning ability,adjusting uneven settlement of foundation.Generally speaking,In the traditional pile-raft foundation designs,the piles bear all the upper loads;Raft thickness meets the requirements of punching and bending-calculation;Piles will be uniform formatted.That will be easy to increase the number of pile,pile length,pile diameter and raft thickness,which results in waste of resources.So the optimization design of pile-raft foundation has become a hot issue.In this paper,the domestic and foreign research status of pile-raft foundation and its theoretical basis are summarized,and the methods used in the finite element software ABAQUS are expounded.Then the three-dimensional model of 3×3 pile-raft foundation was established in ABAQUS;The effects of load,pile-length,pile-space,pile-diameter,elastic modulus of soil and thickness of raft are analyzed.The variation regularity of raft settlement,stress are analyzed,and the extent of different factors impacting on the optimization of pile-raft foundation is given.At last,through the numerical simulation of the pile-raft foundation in the engineering example,the forming methods of different pile-forms are given,and their characteristics in settlement and stress are elaborated.In this paper,the optimization method and the variation regularity of the pile-raft foundation are studied,and the concrete direction and application are obtained.The optimized design steps are provided to guide the design of pile-raft foundation in practice.