基于修正UBCSAND模型的隧道地层液化判别分析
DISCRIMINANT ANALYSIS OF TUNNEL FORMATION LIQUEFACTION BASED ON MODIFIED UBCSAND MODEL
万旺1
作者信息
- 1. 中交第二公路勘察设计研究院有限公司,武汉 430056
- 折叠
摘要
针对依托工程项目地质勘察报告揭示的可能发生液化地层,为分析地层是否会发生液化,以及评估地震作用下地层液化的特征,采用非线性时程分析方法,建立基于修正UBCSAND本构模型的有限元计算模型.分析基本地震和罕遇地震两种工况下,隧道所处地层的孔隙压力比时程曲线及孔隙压力比峰值、地层竖向位移时程曲线及对应峰值,根据液化判据,可确定隧道典型断面所处地层不会发生液化.最后给出隧道工程可能发生地震液化的相应工程预备措施,为类似工程建设提供参考.
Abstract
In order to analyze whether liquefaction may occur in the geological survey report of the engineering proj-ect,and to evaluate the characteristics of liquefaction under seismic action,a nonlinear time history analysis method is adopted to establish a finite element calculation model based on the modified UBCSAND constitutive model.We analyze the pore pressure ratio time history curve and peak value of pore pressure ratio,vertical displacement time history curve,and corresponding peak value of the stratum where the tunnel is located under two working conditions including basic earthquake and rare earthquake.Based on liquefaction criteria,it can be determined that the stratum where the typical section of the tunnel is located will not undergo liquefaction.Finally,corresponding engineering preparatory measures for possible seismic liquefaction in tunnel engineering are proposed,providing the reference for similar engineering construction.
关键词
隧道工程/本构模型/地震液化/判别方法Key words
tunnel engineering/constitutive model/earthquake liquefaction/discriminant methods引用本文复制引用
出版年
2024
NETL
NSTL
万方数据