Settlement Analysis Of Pile Groups Based On ABAQUS

In recent years,with the large-scale development of Chinese basic construction,urbanization accelerated,in order to improve the utilization of land,the construction of various buildings is higher.Because of the increase of building’s height and load,it can usually take advantage of pile group foundations to provide a stable foundation form.Pile group because of its high bearing capacity,high integrity,small deformation and other advantages,it has become a main pile form of foundation,experts and scholars has always considered the research pile group foundation under load stress characteristic is the key and difficult.Firstly,this paper introduces some of the concepts,type and settlement mechanism of the pile group foundation,and analyzes the factors influencing on the settlement of pile group.Secondly,the paper introduces the domestic and foreign status of the calculation method of settlement of pile group foundation,through the analysis of these methods,to weigh the pros and cons of various methods,decided to use finite element method to research and analysis the settlement of pile group foundation.Finally through large finite element software ABAQUS on the settlement of pile group foundation deformation numerical simulation analysis is carried out,according to the different load levels and different pile end extends into the bearing layer depth and different pile spacing three aspects divided into 27 kinds of conditions on pile end bearing soil layer settlement,thickness of the compressed layer,the settlement with soil depth changes,the changes of deformation in the same level of depth and the settlement and deformation along the piles’ different depth,a detailed comparative analysis is carried out,and draws the following rules:1.The thickness of compressible soil layer decreases linearly with the increase of load,and obtains its relational expression.2.The change of pile end into the bearing layer depth only influences the part of the position of the settlement of soil,the position appeares on the cone surface of the intersection point of the soil layer at the end of the pile and the center line of the soil is a vertex,and the cone angle is 90 degrees and other positions have little effect.3.The compression deformation of pile in the distance from the pile top and end are 1/6 times of the length of the pile is more obvious,2/3 in the middle of the pile is mainly for the overall settlement;the pile group effect is obvious when the pile spacing is in the range of 4d~4.5d,the group pile effect began to decrease when the pile spacing increased to 5d.