动荷载作用下人工冻土蠕变试验研究及有限元分析
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摘要
通过室内试验研究获得动荷载作用下人工冻黏土蠕变特性,冻结黏土的动蠕变曲线分为3个阶段:初始蠕变阶段、稳定蠕变阶段和渐进流阶段。依据人工冻土室内动三轴试验结果,基于动力学、连续介质力学和冻土力学原理,建立人工冻土在动荷载作用下的本构模型,即弹-黏弹-黏塑性本构模型。将改进的西原模型成功添加到ADINA软件平台中,利用该模型对人工冻黏土在动荷载作用下的蠕变进行有限元数值仿真,得出的有限元计算结果与试验结果相近。
This paper obtained the artificially frozen soil creep features under dynamic load by the experimental study.The dynamic creep curve of the frozen clay was divided into three stages: the initial creep stage,the steady creep stage and accelerated creep stage.This paper,in accordance with the dynamic triaxial test results of the artificially frozen soil,based on the dynamics,continuum mechanics and frozen soil mechanics principles,established the creep constitutive model of the artificially frozen soil under dynamic load,that was the elastic-viscoelastic-viscoplastic constitutive model.The improved Xiyuan Model was successfully embedded in ADINA FEM.Using this Model,the artificially frozen soil creep under dynamic load was carried on finite element numerical simulation.The results of experiments were close to the calculated ones.
This paper obtained the artificially frozen soil creep features under dynamic load by the experimental study.The dynamic creep curve of the frozen clay was divided into three stages: the initial creep stage,the steady creep stage and accelerated creep stage.This paper,in accordance with the dynamic triaxial test results of the artificially frozen soil,based on the dynamics,continuum mechanics and frozen soil mechanics principles,established the creep constitutive model of the artificially frozen soil under dynamic load,that was the elastic-viscoelastic-viscoplastic constitutive model.The improved Xiyuan Model was successfully embedded in ADINA FEM.Using this Model,the artificially frozen soil creep under dynamic load was carried on finite element numerical simulation.The results of experiments were close to the calculated ones.
引文
[1]何平,朱元林,吴紫汪,等.振动频率对冻土破坏之影响[J].岩土工程学报,1995,17(3):78-81.
[2]沈忠言,张家懿.围压对冻结粉土动力特性的影响[J].冰川冻土,1997,19(3):245-251.
[3]赵淑萍,何平,朱元林,等.冻结砂土在动荷载下的蠕变特征[J].冰川冻土,2002,24(3):270-273.
[4]王兰民,张冬丽,吴志坚,等.地温对冻土动力特性及其场地地震动参数的影响[J].中国地震,2003,19(3):195-205.
[5]王丽霞,凌贤长,徐学燕,等.青藏铁路冻结粉质黏土动静三轴试验对比[J].岩土工程学报,2005,27(2):202-205.
[6]张淑娟,赖远明,张明义,等.动荷载作用下冻土温度变化及强度损失探讨[J].冰川冻土,2006,28(1):131-135.
[7]王丽霞,胡庆立,凌贤长,等.青藏铁路重塑冻结粉质黏土动剪切模量试验研究[J].地震工程与工程振动,2007,27(2):177-180.
[2]沈忠言,张家懿.围压对冻结粉土动力特性的影响[J].冰川冻土,1997,19(3):245-251.
[3]赵淑萍,何平,朱元林,等.冻结砂土在动荷载下的蠕变特征[J].冰川冻土,2002,24(3):270-273.
[4]王兰民,张冬丽,吴志坚,等.地温对冻土动力特性及其场地地震动参数的影响[J].中国地震,2003,19(3):195-205.
[5]王丽霞,凌贤长,徐学燕,等.青藏铁路冻结粉质黏土动静三轴试验对比[J].岩土工程学报,2005,27(2):202-205.
[6]张淑娟,赖远明,张明义,等.动荷载作用下冻土温度变化及强度损失探讨[J].冰川冻土,2006,28(1):131-135.
[7]王丽霞,胡庆立,凌贤长,等.青藏铁路重塑冻结粉质黏土动剪切模量试验研究[J].地震工程与工程振动,2007,27(2):177-180.
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