Deformation Prediction Method of Large Span Pile Foundation Based on PCA-LSTM

Abstract

In order to meet the demand of electricity in the south bank of the Yangtze River, the construction scale of trans-Yangtze River transmission tower is constantly expanding. Current scholars have focused on the wind-vibration response of large span tower and the optimal construction method and technology of pile foundation, but there is little research on the comprehensive influence of various factors on the deformation of large span pile foundation under wind load. In this paper, based on the 385m high large span transmission tower project from Fengcheng to Meili in Jiangsu Province, detailed three-dimensional finite element numerical simulation is carried out to systematically study the factors affecting the deformation of large span tower pile foundation. It is found that the pile foundation deformation of large span tower is closely related to wind speed, wind direction, soil compression modulus and pile length under wind load. Then, the principal component analysis (PCA) is used to reduce the dimensionality of the data, and the principal component information of all indicators is mined. Finally, all the principal component information is divided into the training set and the test set according to the ratio of 8:2. Long short-term memory network (LSTM) is used to predict the deformation of large-span pile foundation, and good results are obtained, which provides preliminary guidance for the design of oversize transmission tower pile foundation engineering.