| Baiqugang sluice and pump station is located at the intersection of chensigang and the Yangtze River in Binjiang Economic Development Zone of Jiangyin City,about 350m away from the Yangtze River Estuary.Due to the poor geological conditions,cement soil mixing pile is used to reinforce the foundation.In order to study the safety and stability of baiqugang sluice and pump station on composite foundation,this thesis studies computing method of compression modulus of composite foundation on the basis of reading a large number of literatures,and carries out the finite element analysis of baiqugang sluice and pump station structure by using ABAQUS software.The main research contents are listed as follow:(1)For the representative element of composite foundation,the numerical simulation of compression test without lateral deformation is carried out by finite element method.Through the comparative analysis of the numerical simulation test results of single pile,four pile and nine pile representative element,it shows that it is reasonable to select four pile representative element to calculate the compression modulus of composite foundation.(2)This thesis selects the length of pile,area replacing ratio,modulus of pile,modulus of soil between piles and modulus of underlying soil as the five parameters influencing compression modulus of composite foundation,compare and analyze the sedimentation,stress-strain and compression modulus of composite foundation under the influence of these five parameters,and analyze the sensitivity of parameters influencing compression modulus of composite foundation.This leads to the conclusion that the order of the influence of these five parameters on the compression modulus of composite foundation is:area replacing ratio,modulus of pile,modulus of soil between piles,the length of pile and modulus of underlying soil.Furthermore,the BP neural network algorithm is realized by MATLAB,and the neural network prediction model of the compression modulus of composite foundation with these five parameters is established.(3)Based on the compression modulus of the composite foundation calculated by the prediction model,the deformation modulus of the composite foundation is determined.ABAQUS software is used to establish the three-dimensional finite element analysis model of the structure and composite foundation of baiqugang sluice and pump station.The overall effect between the composite foundation and the combined structure of the sluice and pump station is fully considered.The displacement,stress,bearing capacity of foundation,internal force and reinforcement of the bottom plate of the sluice and pump station under different working conditions are analyzed.The results show that the structure of baiqugang sluice and pump station has good safety and stability. |
