同济大学学报（自然科学版）2009，Vol.37Issue(10)：1313-1318,6.DOI:10.3969/j.issn.0253-374x.2009.10.007
强震持时对河流堤防液化特性的影响
Effects of Strong Ground Motion Duration on Liquefaction Behavior of River Levee
摘要
Abstract
In the Chubu region, central Japan, two kinds of earthquakes are likely to occur with different duration characteristics: ① the Tonankai-Tokai coupled earthquake, with duration longer than 100 s at a maximum acceleration of about 2.4m·s~(-2);② an inland earthquakes due to active faults, with duration shorter than 20 s at a maximum acceleration of about 6.0 m·s~(-2). Saturated loose sand deposits are widely distributed over the low alluvial plain in this region which, therefore, have a high liquefaction potential. Based on the Biot theory for simulating coupled hydro-dynamic behavior in saturated porous media, this study presents a numerical assessment of the seismic behavior of a river levee founded on liquefiable foundation soils under earthquake loading. Analysis is carried out by using an effective stress-based,fully coupled, finite element method, in which the behavior of the liquefiable sand is described by a cyclic elastoplastic constitutive model. The liquefaction responses of the river levee are compared between two different earthquakes. Numerical results show that the strong motion duration has a significant effect on the liquefaction behavior of the levee including excess pore water pressures,accelerations, and deformations. The longer ground motion may lead to much larger settlement of the river levee.关键词
河堤/液化/强震持时/沉降/数值模拟Key words
river levee/ liquefaction/ duration of strong motion/ settlement/ numerical simulation分类
建筑与水利引用本文复制引用
黄雨,八嶋 厚,杉戸 真太..强震持时对河流堤防液化特性的影响[J].同济大学学报（自然科学版）,2009,37(10):1313-1318,6.基金项目
国家自然科学基金资助项目(40841014,40802070) （40841014,40802070）
上海市重点学科建设资助项目(B308) （B308）
