doi:10.16186/j.cnki.1673-9787.2020020016

Received:2020/02/11

Revised:2020/06/04

Published:2021/09/15

Simplified analysis method for cyclic ally laterally loaded pile in sand based on strain wedeg model

XINGKangyu 1,2,3, WUWenbing 1,2, ZHANG Kaishun1,2, LIUHao 1,2

1.Faculty of Engineering， China University of Geosciences， Wuhan  430074 ， Hubei， China;2.Engineering Research Center of Rock-Soil Drilling & Excavation and Protection， Ministry of Education， Wuhan  430074 ， Hubei， China;3.China Railway Engineering Consulting Group Zhengzhou Deign Institute， Zhengzhou  450001 ， Henan， China

Abstract:In order to reflect the influence of cyclic lateral load on the weakening effect of pile surrounding soil and the development law of pile lateral displacement ， a simplified analysis method for the bearing behavior of cyclic laterally loaded pile was proposed based on strain wedge model. The empirical formula of the stiffness attenuation of sand soil was firstly utilized to calculate the weakening degree of the stiffness of pile surrounding soil ， which was further applied to determine the stress-strain relationship of soil during eyclic reloads. Then， this stress-strain relationship was introduced into the strain wedge model to calculate the lateral response of pile considering the effect of cycles number and loading amplitude. Finally， the proposed method was proved to be able to effectively calculate the development law of pile lateral displacement during the action of cyclic load sthrough the comparative analysis with the test cases. The results showed that ， the pile lateral displacement in-creased with the number of cycles increased ， and its development mode was related to the loading magnitude. The lateral bearing capacity of pile foundation would be weakened in a large degree by cyclic loads.

Key words:cyclic laterally loaded pile;strain wedge model;stiffness degradation;simplified analysis;lateral displacement

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