动荷载作用下冻结兰州黄土的动应变幅变化特征研究
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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.
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.
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.
引文
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[2]Li Jinjun,Huang Maosong,Wang Yude.Analysis of cumula-tive plastic deformation of soft clay foundation under trafficloading[J].China Journal of Highway and Transport,2006,19(1):1-5.[李进军,黄茂松,王育德.交通荷载作用下软土地基累积塑性变形分析[J].中国公路学报,2006,19(1):1-5.]
[3]Li Dingqing,Selig E T.Cumulative plastic deformation forfine-grained subgrade soils[J].Journal of Geotechnical Engi-neering,1996,122(12):1006-1013.
[4]Li Dingqing,Selig E T.Method for railroad track foundationdesign(Ⅰ):Development[J].Journal of Geotechnical andGeoenvironmental Engineering,1998,124(4):316-322.
[5]Li Dingqing,Selig E T.Method for railroad track foundationdesign(Ⅱ):Application[J].Journal of Geotechnical andGeoenvironmental Engineering,1998,124(4):323-329.
[6]Chai J C,Miura N.Traffic-load-induced permanent deforma-tion of road on soft subsoil[J].Journal of Geotechnical andGeoenvironmental Engineering,2002,128(11):907-916.
[7]Xia Qiong,Yang Youhai,Dou Shun.Frost heaving character-istics of Lanzhou-Xinjiang railway subgrade and the treatmentof frost damage[J].Journal of Glaciology and Geocryology,2011,33(1):164-170.[夏琼,杨有海,窦顺.兰新铁路路基冻胀特征及冻害整治措施研究[J].冰川冻土,2011,33(1):164-170.]
[8]Liu Zhiqiang,Lu Hao.Dynamic response of embankment incold regions to earthquake action[J].Journal of Glaciologyand Geocryology,2011,33(4):807-812.[刘志强,陆昊.冻土路基在地震作用下的动力响应[J].冰川冻土,2011,33(4):807-812.]
[9]Zhu Zhanyuan,Li jing,Zou Zuyin,et al.Study on deforma-tion characters of frozen soil under load-term dynamic loading[J].Low Temperature Architecture Technology,2008,2:112-114.[朱占元,李静,皱祖银,等.动力荷载作用下冻土变形特性研究[J].低温建筑技术,2008,2:112-114.]
[10]Zhu Zhanyuan,Ling Xianzhang,Hu Qingli,et al.Experimen-tal study on dynamic strain rate of frozen soil from railway em-bankment of Qinghai-Tibet railway in China[J].ChineseJournal of Geotechnical Engineering,2007,29(10):1472-1476.[朱占元,凌贤长,胡庆立,等.中国青藏铁路北麓河路基冻土应变速率试验研究[J].岩土工程学报,2007,29(10):1472-1476.]
[11]Li Shuangyang,Zhang Mingyi,Zhang Shujuan,et al.Analy-sis of the dynamic response of Qinghai-Tibetan Railway em-bankment in permafrost regions under train load[J].Journalof Glaciology and Geocryology,2008,30(5):860-867.[李双洋,张明义,张淑娟,等.列车荷载下青藏铁路冻土路基动力响应分析[J].冰川冻土,2008,30(5):860-867.]
[12]Gu Haidong,Tang Aiping,Yang Min.Analysis on dynamicresponse with a traffic loading on permafrost subgrade[J].Low Temperature Architecture Technology,2010,8:85-87.[古海东,汤爱平,杨敏.交通荷载作用下冻土路基动力反应分析[J].低温建筑技术,2010,8:85-87.]
[13]Pei Jianzhong,Dou Minjian,Hu Changshun,et al.Formingmechanism of embankment longitudinal cracks in permafrostregions[J].Journal of Glaciology and Geocryology,2006,28(1):116-121.[裴建中,窦明健,胡长顺,等.多年冻土地区路基纵向裂缝形成机理研究[J].冰川冻土,2006,28(1):116-121.]
[14]Chen Tuo,Wu Zhijian,Che Ailan,et al.Test study on dy-namic responses of railroad embankments in permafrost regionsunder train dynamic loading[J].Journal of Earthquake Engi-neering and Engineering Vibration,2011,31(1):168-172.[陈拓,吴志坚,车爱兰,等.机车动荷载作用下多年冻土区铁路路基动力响应的实验研究[J].地震工程与工程振动,2011,31(1):168-172.]
[15]Chang Liwu,Xu Yanjie.Numerical simulation for dynamic re-sponses of high temperature frozen subgrade[J].Subgrade En-gineering,2007,4:34-35.[常利武,徐艳杰.高温冻土路基动力响应的数值模拟研究[J].路基工程,2007,4:34-35.]
[16]Zhang Kexu,Xie Junpei.Soil Dynamics[M].Beijing:Seismo-logical Press,1989:29-32.[张克绪,谢君裴.土动力学[M].北京:地震出版社,1989:29-32.]
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