寒区工程动荷载模型试验系统设计
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摘要
寒区工程动荷载模型试验系统主要由模型试验槽、制冷及控温装置、动力加载装置、传感器和数据采集系统四部分组成.系统具有如下特点:能根据实际工程对长3 m、宽2.5 m和高1 m的模型试验土体进行低温动荷载试验;采用3组冷冻板给土体降温,降温速度快,能提供的最低温度为-20℃,而且能提供多组均匀、稳定的温度边界,冷冻板的温度波动度≤±0.2℃,温度均匀度≤±0.3℃;可施加多种频率、多种波形的动力荷载,频率范围为0.1~10 Hz,加载波形为正弦波、矩形波、三角波以及用户自定义波形.另外,系统能提供的最大载荷为100 kN,而且作动器行程较大,为±75 mm,适合多种尺寸的模型土体.试验时,先装样并布设各类传感器,然后对土体降温,温度达到要求后施加动力荷载,最后通过传感器和数据采集系统获得土体的应力、变形及温度变化数据.
The model test system for cold regions engineering with dynamic loading is introduced in this paper.This system consists of model test tank,refrigeration system and temperature controller,dynamic loading system,sensors and date collectors,of which the features are presented as follows.The maximum length,width and height of model test specimen are 3 m,2.5 m and 1m,respectively.Three groups of freezing plate are used to lower the temperature of model specimen,so the cooling rate is fast.The lowest temperature provided by refrigeration system is-20 ℃.The temperature fluctuation and uniformity of freezing plate are less than±0.2 ℃ and ±0.3 ℃,respectively.The maximum load provided by dynamic loading system is 100 kN and the maximum move distance of actuator is ±75 mm.The vibration frequency of dynamic load can change in the range of 0.1~10 Hz.Several kinds of waveform,such as sine wave,rectangular wave,triangle wave and other waves defined by user,can be produced by controller of dynamic loading system.To perform a model test,first,put specimen into the model test tank,secondly,lower the temperature of model specimen,thirdly,press dynamic load on the specimen,finally,collect data of stress,deformation and temperature change by sensors and date-collectors.
引文
[1]Zhu Yuanlin.Introduction of the U.S.Army Cold RegionsResearch and Engineering Laboratory(CRREL)[J].Journalof Glaciology and Geocryology,1987,9(1):55-58.[朱元林.美国陆军寒区研究和工程实验室简介[J].冰川冻土,1987,9(1):55-58.]
    [2]Wang Cunzhi,Ma Lianqing.The Low-Temperature ScienceResearch Institute of Hokkaido University of Japan[J].Jour-nal of Glaciology and Geocryology,1980,2(1):62.[王存志,马连庆.日本北海道大学低温科学研究所[J].冰川冻土,1980,2(1):62.]
    [3]Cui Guangxin,Yang Weihao.Stress analysis on freezing pipesby modeling test[J].Journal of China University of Mining&Technology,1990,19(2):69-75.[崔广心,杨维好.冻结管受力的模拟试验研究[J].中国矿业大学学报,1990,19(2):69-75.]
    [4]Bing Hui.Study on Failure Mechanism of Roadbed with SaltySoil during Cyclical Freezing and Thawing[D].Lanzhou:Cold and Arid Regions Environmental and Engineering Re-search Institute,2008.[邴慧.反复冻融作用下含盐土路基破坏机理研究[D].兰州:中国科学院寒区旱区环境与工程研究所,2008.]
    [5]Yu Wenbing,Lai Yuanming,Niu Fujun,et al.Temperaturefield features in the laboratory experiment of the ventilatedrailway embankment in permafrost regions[J].Journal ofGlaciology and Geocryology,2002,24(5):601-607.[喻文兵,赖远明,牛富俊,等.多年冻土区铁路通风路基室内模型试验的温度场特征[J].冰川冻土,2002,24(5):601-607.]
    [6]Liu Xuezhu,Chen Guoxing.Advances in researches on me-chanical behavior of subgrade soils under repeated-load of high-speed track vehicles[J].Journal of Disaster Prevention andMitigation Engineering,2008,28(2):248-255.[刘雪珠,陈国兴.轨道交通荷载下路基土的动力学行为研究进展[J].防灾减灾工程学报,2008,28(2):248-255.]
    [7]Tang Liansheng,Liao Huarong,Liu Zengxian,et al.Ad-vances in research on mechanical behavior of the subgrade soilsunder dynamic load[J].Geological Science and TechnologyInformation,2006,25(2):103-112.[汤连生,廖化荣,刘增贤,等.路基土动荷载下力学行为研究进展[J].地质科技情报,2006,25(2):103-112.]
    [8]Cao Xinwen,Cai Ying.A model test study of the dynamic per-formance of subgrades[J].Journal of Southwest Jiaotong U-niversity,1996,31(1):36-41.[曹新文,蔡英.铁路路基动态特性的模型试验研究[J].西南交通大学学报,1996,31(1):36-41.]
    [9]Cao Xinwen,Cai Ying.Experimental research on the geocellof compound subgrade-bed for passenger dedicated railway line[J].Journal of Railway Engineering Society,2006,91(1):22-26.[曹新文,蔡英.客运专线土工格室复合基床的试验研究[J].铁道工程学报,2006,91(1):22-26.]
    [10]Su Qian,Cai Ying.Dynamic large model experimental studyon different thickness of surface layer of graduation gravelhigh-speed railway subgrade-bed[J].Railway Standard De-sign,2001,21(8):1-4.[苏谦,蔡英.高速铁路级配碎石基床表层不同厚度动态大模型试验研究[J].铁道标准设计,2001,21(8):1-4.]
    [11]Ma Weibin,Shi Cunlin,Zhang Qianli,et al.Dynamic modelexperimental study on effects of mechanical properties of rail-way subgrade beds on ballast beds under cyclic loading[J].Journal of the China Railway Society,28(4):102-108.[马伟斌,史存林,张千里,等.循环载荷作用下基床力学特性对道床影响的动态模型试验研究[J].铁道学报,2006,28(4):102-108.]
    [12]Dong Liang,Cai Degou,Ye Yangsheng,et al.A method forpredicting the cumulative deformation of high speed railwaysubgrades under cyclic train loads[J].China Civil Engineer-ing Journal,2010,43(6):100-108.[董亮,蔡德钩,叶阳升,等.列车循环荷载作用下高速铁路路基累积变形预测方法[J].土木工程学报,2010,43(6):100-108.]
    [13]Liu Jimin,Shen Ying,Zhao Shuping.High-precision ther-mistor temperature sensor:Technological improvement andapplication[J].Journal of Glaciology and Geocryology,2011,33(4):765-771.[刘继民,沈颖,赵淑萍.高精度热敏电阻温度传感器的技术改进及使用特点[J].冰川冻土,2011,33(4):765-771.]
    [14]Chen Guoxing,Zuo Xi,Wang Zhihua,et al.Large scale sha-king table test study of the dynamic damage behavior of sub-way station structures in liquefiable foundation under near faultand far field ground motion[J].China Civil EngineeringJournal,2010,43(12):120-126.[陈国兴,左熹,王志华,等.近远场地震作用下液化地基上地铁车站结构动力损伤特性的振动台试验[J].土木工程学报,2010,43(12):120-126.]
    [15]Liu Jingbo,Liu Xiangqing,Wang Zonggang,et al.Dynamiccentrifuge model test of a soil structure interaction system[J].China Civil Engineering Journal,2010,143(11):114-121.[刘晶波,刘祥庆,王宗纲,等.土-结构动力相互作用系统离心机振动台模型试验[J].土木工程学报,2010,143(11):114-121.]
    [16]Yu Yuzhen,Li Rongjian,Li Guangxin,et al.Experimentalstudy on centrifuge model dynamic behavior of slopes with sat-urated subgrades during earthquakes[J].Journal of Tsing-hua University(Science&Technology),2008,48(9):42-45.[于玉贞,李荣建,李广信,等.饱和砂土地基上边坡地震动力离心模型试验研究[J].清华大学学报(自然科学版),2008,48(9):42-45.]
    [17]Su Qian,Zhong Biao,Wang Xun,et al.Instable deformationcharacteristics of sloping subgrade in permafrost region forQinghai-Tibet railway[J].Journal of Central South Univer-sity(Science and Technology),2010,41(5):1938-1944.[苏谦,钟彪,王迅,等.青藏铁路多年冻土斜坡路基失稳变形特性[J].中南大学学报(自然科学版),2010,41(5):1938-1944.]

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