机车荷载作用下青藏铁路多年冻土区普通路基的蠕变分析

英文篇名：Creep analysis of plain fill embankment at permafrost regions along Qinghai-Tibet Railway under train dynamic load
中文刊名：岩土力学
英文刊名：Rock and Soil Mechanics
作者：吴志坚 ; 陈拓 ; 马巍
英文作者：WU Zhi-jian1 ; 2 ; 3 ; CHEN Tuo1 ; 2 ; MA Wei4 (1.Lanzhou Institute of Seismology ; China Earthquake Administration ; Lanzhou 730000 ; China ; 2.Open Laboratory of Loess Earthquake Engineering ; China Earthquake Administration ; Lanzhou 730000 ; China ; 3.Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province ; Lanzhou 730000 ; China ; 4.State Key Laboratory of Frozen Soil Engineering ; Cold and Arid Regions Environmental and Engineering Institute ; Chinese Academy of Sciences ; Lanzhou 730000 ; China)
中文关键词：多年冻土 ; 振动监测 ; 素土路基 ; 蠕变效应
英文关键词：permafrost ; vibration monitoring ; plain fill embankment ; creep effect
出版日期：2011-08-15
机构：中国地震局兰州地震研究所;中国地震局黄土地震工程开放实验室;甘肃省岩土防灾工程技术研究中心;中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室;
年：2011
期：S2
出版单位：岩土力学

摘要

基于青藏铁路北麓河试验段的机车现场实时振动监测,在三轴流变试验的基础上,利用ABAQUS有限元软件中的时间硬化与Druker-Prager屈服破坏准则耦合的蠕变模型,对青藏铁路多年冻土区的普通素土路基在等效机车荷载作用下的蠕变效应进行分析。研究表明,ABAQUS软件中时间硬化与蠕变模型能较好地模拟路基运营过程中的时间效应,素土路基的竖向位移由路基顶部中心位置向路基内部和两侧逐渐减小,一年中的最大位移达14 mm,与该段的年沉降变形观测值一致。路基中心的蠕变应变值大于路基顶面和天然地表的应变值,路基中心受机车荷载的振动影响最大。
Based on the train dynamic vibration in-situ monitoring at the Beiluhe test section of Qinghai-Tibet Railway and the laboratory triaxial compression creep test,time hardening power function rule and Druker-Prager yield and failure criterion coupled creep model of the ABAQUS FE were utilized to simulate the creep effect of the plain fill embankment at the permafrost area of Qinghai-Tibet Railway.The results show that the time hardening power function rule and creep model simulate the time effect during operation of the railway embankment accurately;vertical displacement decreases gradually from center of embankment top to inside and both sides of the plain fill embankment.The maximal displacement reaches 14 mm in one year;and this value is consistent with the result of deformation observation in-situ.The creep strain value of center is greater than that of top and natural ground of the embankment;and the center of embankment is most influenced by train dynamic vibration.

引文

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