土工基础

›› 2017, Vol. 31 ›› Issue (1): 96-99.

• 工程实录 • 上一篇    下一篇

地震荷载下液化土地区路基动力特性分析

周 波，雍旺雷   

  1. （中国葛洲坝集团第一工程有限公司，湖北宜昌 443002）
  • 收稿日期:2016-11-15 修回日期:2017-01-10 出版日期:2017-02-20 发布日期:2017-02-24
  • 作者简介:周 波（1983-），男，助工，研究方向为工程管理。

Seismic Characteristics of Subgrade Liquefiable Soils under Earthquakes Conditions

ZHOU Bo, YONG Wanglei   

  1. (China Gezhouba Group First Engineering Co., Ltd., Yichang, 443002)
  • Received:2016-11-15 Revised:2017-01-10 Online:2017-02-20 Published:2017-02-24

摘要： 以京沪高速铁路液化土地区路基为研究对象，采用数值模拟方法，以concrete波为地震波，分析了在该地震作用下路基的动力响应规律及地基液化区域分布。分析结果表明，路基对地震加速度存在放大作用；中、低频段加速度反应谱值较大，主振频率范围为0.5～3.0 Hz；当地震加速度为0.1g时，仅路基坡脚附近地表发生小面积液化，当地震加速度为0.15g至0.20g时，地基几乎全部液化，该区域路基地基需进行抗液化处理。

关键词: 液化土, 地震, 数值模拟, 动力特性

Abstract: This paper presents a case study of the liquefiable soil area in the BeijingShanghai high speed rail project. The seismic performance of the rail embankment and the distribution of the liquefiable soil are simulated with numerical analysis using concrete as the synthetic earthquake event. The results indicates that, the rail embankment has an amplification effect of the seismic reactions. Larger response spectrum values are found at the medium to low frequencies. Its principal frequency range is between 0.5 and 3.0 Hz. Local soils are found liquefied when the ground acceleration is 0.1 g; whereas, almost all soils will be liquefied when the ground acceleration reaches 0.15 g to 0.2 g. Therefore, the ground improvement to eliminate the potential liquefaction is needed.

Key words: liquefiable soil, earthquake, numerical simulation, seismic characteristics