Study Of Influence Of Soft Soil Foundation Treatment Method On Seismic Performance Of Pump Station Structure

The soft soil foundation has small elastic modulus and large compressibility,and it is not only low in bearing capacity,but also difficult to meet the seismic performance requirements of building structures,Therefore,the soft soil foundation needs to be treated in the project.Common treatment methods for soft soil foundations include pile foundation,CFG composite foundation,diaphragm wall foundation,etc.Each of these common treatment methods have advantages and disadvantages.In this paper,the influence of different soft soil foundation treatment methods on the seismic performance of pumping station structures is analyzed by finite element numerical simulation,and explore the ground treatment method that is more suitable for this project.The main research contents and conclusions are as follows:1?Using the finite element software ANSYS,the dynamic time history analysis of the finite element model of the pumping station structure under the three soft soil foundation treatment methods of pile foundation,CFG pile composite foundation and diaphragm wall foundation is carried out,and the dynamic characteristics and seismic performance of the structure under three schemes are compared and analyzed.The results show that the seismic performance of pile foundation and CFG pile composite foundation is relatively close,while the seismic performance of diaphragm wall foundation is much better than the other two foundations.2?The finite element analysis of the pile + diaphragm wall combination foundation shows that the seismic performance of the combined foundation is much better than the pile foundation and slightly worse than the diaphragm wall foundation.From the perspective of seismic performance and materials,the combined foundation is more cost-effective and has certain feasibility.3?The finite element analysis is carried out on the parameters such as pile diameter,pile distance,thickness of diaphragm wall and foundation depth of the combined foundation,and the influence of the main parameters of the combined foundation on the seismic performance of the structure is explored.The results show that the pile diameter,pile spacing and thickness of the diaphragm wall have little effect on the seismic performance of the combined foundation,and the foundation depth has a great influence on the seismic performance of the combined foundation.With the increase of the foundation depth,the seismic response of the structure is greatly reduced.