岩土力学2017，Vol.38Issue(10)：3017-3028,3038,13.DOI:10.16285/j.rsm.2017.10.031
黏弹性地基中基坑开挖对邻近桩基变形影响的时域解
Time-domain solution for influence of excavation on adjacent pile deformation in visco-elastic foundation
摘要
Abstract
At present,the studies of adjacent pile deformation caused by foundation excavation in transient case are common.Less attention has been paid to the influences of time behavior on the pile-soils interaction.The disturbed soils show the rheological properties during excavation.A two-stage method considering the soil visco-elasticity is proposed to obtain the time-domain solution for the interaction between adjacent pile and foundation pit excavation.On the first stage,based on Boltzmann visco-elastic model,a Mindlin's time-domain solution is derived to analyze the influence of excavation on soil additional stress at the position of adjacent pile in visco-elastic foundation.On the second stage,a Pasternak's two-parameter foundation model is adopted to simulate the interaction between pile and soils.A simplified time-domain solution of pile horizontal deformation is derived in consideration of rheological effects.Finally,the simulation results from finite difference software are compared to simplified time-domain solution with good agreements.The parameters of Boltzmann visco-elastic model (bulk modulus,shear modulus,viscosity coefficient),pile diameter,excavation depth,distance between pile and foundation pit and excavation size are analyzed to investigate the influences on pile deformation.It is shown that the presented simplified time-domain solution can reflect the influence of excavation on adjacent pile deformation and the development trend of pile deformation with time.It may provide certain theoretical basis for practical projects.关键词
基坑工程/桩基/黏弹性/Boltzmann模型/时域分析Key words
foundation pit engineering/pile/visco-elasticity/Boltzmann model/time-domain solution分类
建筑与水利引用本文复制引用
张治国,鲁明浩,宫剑飞..黏弹性地基中基坑开挖对邻近桩基变形影响的时域解[J].岩土力学,2017,38(10):3017-3028,3038,13.基金项目
国家自然科学基金项目(No.41772331) （No.41772331）
上海自然科学基金项目(No.15ZR1429400) （No.15ZR1429400）
国土资源部丘陵山地地质灾害防治重点实验室课题(No.2015k005) （No.2015k005）
建筑安全与环境国家重点实验室课题(No.BSBE2015-01).This work was supported by the National Natural Science foundation of China (41772331),the Natural Science Foundation of Shanghai (15ZR1429400),the Open Project Program of Key Laboratory of Geohazard Prevention of Hilly Mountains of Ministry of Land and Resources (2015k005) and the Open Project Program of State Key Laboratory of Building Safety and Environment (BSBE2015-01). （No.BSBE2015-01）
