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动荷载作用下冻结兰州黄土的动应变幅变化特征研究

ISSN号：1000-0240
期刊名称：冰川冻土
时间：0
页码：884-890
分类：P642.14[天文地球—工程地质学;天文地球—地质矿产勘探;天文地球—地质学]
作者机构：[1]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,甘肃兰州730000, [2]四川农业大学城乡建设学院,四川都江堰611830, [3]兰州大学西部灾害与环境力学教育部重点实验室,甘肃兰州730000
相关基金：中国科学院“西部之光”重点项目“列车荷载作用下青藏铁路冻土路基的动力响应特性研究”;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自主课题（O9SF102003）; 国家自然科学基金项目（41023003;40971046;40901039）资助
相关项目：交通荷载和冻融循环综合作用下路基的响应特性研究

关键词：分级动荷载, 冻土, 动应变幅, 等价应变幅, 临界频率, staged dynamic loading； frozen soil； dynamic strain amplitude； equivalent dynamic strain amplitude； critical frequency；

中文摘要：

采用分级循环正弦荷载模拟车辆振动,通过动三轴试验对冻土的动应变幅进行了研究.结果表明：对于频率为0.1Hz的前5级加载和频率≥0.5Hz的各级加载作用下的动应变幅,可以采用等价应变幅描述每一级动荷载作用下的动应变幅.存在一个临界频率（约为7Hz）,当加载频率小于该临界频率时,等价应变幅变化复杂;当加载频率大于该临界频率时,等价应变幅随加载级数基本保持不变.当加载频率≥0.5Hz时,不同加载级数下等价应变幅随加载频率的增大而减小.围压对等价应变幅影响较小;当频率≤0.5Hz时,-0.5℃条件下的等价应变幅略大于-1.0℃条件下的等价应变幅;当频率〉0.5Hz时,不同温度下的等价应变幅近似相等.

英文摘要：

Based on dynamic tri-axial tests at low temperature,dynamic strain amplitude of frozen soil was studied under vehicle vibration load,which was simplified as staged and cyclic sinusoidal load.The research results show that the equivalent dynamic strain amplitude can be used to describe the dynamic strain amplitude under each stage load when the vibration frequency is greater than or equal to 0.5 Hz for each stage load and is equal to 0.1 Hz for the initial five stage loads.The equivalent dynamic strain amplitude is very complicated with the increasing load when the vibration frequency is less than the critical vibration frequency,approximately equal to 7 Hz,and basically remains constant when the vibration frequency is greater than the critical vibration frequency.The equivalent dynamic strain amplitude decreases with increasing vibration frequency when the vibration frequency is greater than or equal to 0.5 Hz.Confining pressure has nearly no impact on the equivalence dynamic strain amplitude.The equivalent dynamic strain amplitude under-0.5 ℃ is slightly greater than that under-1 ℃ when the vibration frequency is less than or equal to 0.5 Hz.The value of the equivalent dynamic strain amplitude is approximately unanimous when the vibration frequency is greater than 0.5 Hz.

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