冻土覆盖场地下的EPS材料减振性能评价
摘要:在地震荷载作用下，桩基在土层界面处易出现变形和应力集中，该现象在冻土与其他土层的界面处尤为明显，是导致冻土覆盖场地桩基失效重要原因。EPS材料(发泡聚苯乙烯)具有改善应力集中和减压的作用，在工程中被广泛用作路基填料。为评价EPS材料的减振性能，本文将EPS材料用作桩身和冻土层间的保护层，进行了振动台模型试验及数值计算。并进一步地在数值计算中探讨塑性材料的减振效果。结果表明，EPS材料能降低冻土覆盖场地中桩的应变、剪力、压力的峰值，具有良好的减振性能。塑性材料降低剪力、压力的性能更强，且效果随材料横截面积增大而变得更好。
Abstract:Under the effect of the seismic load,pile foundation is prone to deformation and stress concentration at the interface between two soil layers.This phenomenon is particularly obvious at the interface between frozen soil and the other soil layers which can eventually lead to pile failure.The EPS material is effective on stress concentration and pressure-relief,and widely used as roadbed filler.The EPSmaterial was proposed to be the protective layer between pile and frozen soil in the depth of frozen soil.Shaking table modeling test and numerical simulation was conducted to evaluate the EPS material's vibration reduction performance.This effect of plastic material was also discussed in further numerical simulation.It shows that the EPS material can reduce the peak value of strain,shear force and pressure of pile in the frozen soil.The plastic material has stronger capacity to reduce them,and the effect becomes better as the cross-sectional area of material increases.
中文标题：
冻土覆盖场地下的EPS材料减振性能评价
EPS Vibration Reduction Performance under Frozen Soil
作者：
刘潜1,杨世浩1,张振虎1,2
Liu Qian1,Yang Shihao1,Zhang Zhenhu1,2
作者简介:刘潜，男，1994年生，汉族，湖北武汉人，中国地质大学(武汉)土木工程专业在读硕士研究生，主要从事土木减隔振研究。E-mail：QianLau94@163.com
通讯地址：
1. 中国地质大学(武汉)工程学院, 湖北武汉 430074; 2. 中建三局集团有限公司工程总承包公司, 湖北武汉 430064
1.SchoolofEngineering,ChinaUniversityofGeosciences,Wuhan430074,Hubei,China; 2.ConstructionThirdEngineeringBureauGroupCo.,Ltd.,GeneralContractingCompany,Wuhan430064,Hubei,China
中图分类号:TU445
doi:10.3969/j.issn.1007-2993.2019.05.010
出版物：岩土工程技术
收稿日期:2019-04-18
网络出版日期:2021-07-06
关键词:地震荷载,桩土相互作用,冻土,减振,EPS
Key words:seismic load,pile-soil interaction,frozen soil,vibration reduction,EPS
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基金项目：
基金项目: 冻土工程国家重点实验室开放基金(SKLFSE201306)
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