循环荷载下冻结兰州黄土变形性质的实验研究
|
摘要
对温度为-1℃的冻结兰州黄土在围压为0.6 MPa和不同动荷载振动频率条件下进行动三轴试验,试验采用分级加载,每一级荷载振动十次,加载波形为正弦波。实验结果表明:冻结兰州黄土的累积应变在整个加载过程中逐渐增大;当动荷载加载级数增加时,累积应变率逐渐变大。动应变幅随加载频率和振次的增加而减小;当频率小于或等于1 Hz时,动应变幅随加载级数的增加而增大;当频率大于1 Hz时,动应变幅随加载级数变化不大。随着加载级数的增加,滞回曲线的面积和密集程度越来越小,整体斜率和不闭合程度越来越大。用动模量来描述滞回曲线的整体倾斜程度。当频率小于或等于7 Hz时,动模量随加载级数的增加而增大;当频率大于7 Hz时,动模量随加载级数没有明显的规律。
Under the confining pressure(0.6 MPa)and different vibratory frequencies of dynamic loads,a dynamic triaxial test is applied to measure dynamic modulus of frozen Lanzhou loess at-1 ℃.The dynamic loads,in the form of sine wave,are imposed on frozen soil and divided into several levels,each level consists of up to 10 cycles.The test results show that the accumulative strain in the whole process of loading increases gradually and the accumulative strain rate increases with increment of loading level.The dynamic strain amplitude decreases with increment of frequency or the number of vibrations.When the frequency is less than or equals to 1 Hz,the loading level increases with the dynamic strain amplitude;when the frequency exceeds 1 Hz,the dynamic strain amplitude changes little.With increase of loading level increment,the size and intensity of hysteresis loops decrease and slope and open degree of hysteresis loops increase gradually.Dynamic modulus,which is adopted to describe tilted degree of hysteresis loops,increases with increment of frequency.When the frequency is less than or equals to 7 Hz,the dynamic modulus increases with increment of loading level;when the frequency exceeds 7 Hz,there is no evident regularity of dynamic modulus changing with loading level.
Under the confining pressure(0.6 MPa)and different vibratory frequencies of dynamic loads,a dynamic triaxial test is applied to measure dynamic modulus of frozen Lanzhou loess at-1 ℃.The dynamic loads,in the form of sine wave,are imposed on frozen soil and divided into several levels,each level consists of up to 10 cycles.The test results show that the accumulative strain in the whole process of loading increases gradually and the accumulative strain rate increases with increment of loading level.The dynamic strain amplitude decreases with increment of frequency or the number of vibrations.When the frequency is less than or equals to 1 Hz,the loading level increases with the dynamic strain amplitude;when the frequency exceeds 1 Hz,the dynamic strain amplitude changes little.With increase of loading level increment,the size and intensity of hysteresis loops decrease and slope and open degree of hysteresis loops increase gradually.Dynamic modulus,which is adopted to describe tilted degree of hysteresis loops,increases with increment of frequency.When the frequency is less than or equals to 7 Hz,the dynamic modulus increases with increment of loading level;when the frequency exceeds 7 Hz,there is no evident regularity of dynamic modulus changing with loading level.
引文
[1]Vyalov S S.Cmoshinskii S E,et al.The strength andcreep of frozen soil and calculations for ice-soil retainingstructures[D].US:US CRREL Translation,1963.76.
[2]Ladanyi B.An engineering theory of creep of frozensoils[J].Canadian Geotechnical Journal,1972,9(1):63-88.
[3]Ting J M.Tert iary creep model for frozen sand[J].ASCEN Journal of Geotechnical Engineering,1983,109(7):932-945.
[4]赵淑萍,朱元林,何平,等.冻土动力学参数测试研究[J].岩石力学与工程学报,2003,22(增2):2 677-2 681.(Zhao Shuping,Zhu Yuanlin,He Ping,et al.Testing study on dynamic mechanics parameters of frozensoil.Chinese Journal of Rock Mechanics and Engineer-ing,2003,22(Supp.2):2 677-2 681.(in Chinese))
[5]徐春华,徐学燕,邱明国,等.循环荷载下冻土的动阻尼比试验研究[J].哈尔滨建筑大学学报,2002,35(6):24-27.(Xu Chunhua,Xu Xueyan,Qiu Mingguo,et al.Experimental study on dynamic damping ratio offrozen soil under cyclic loading[J].Journal of HarbinUniversity of C.E.&Architecture,2002,35(6):24-27.(in chinese))
[6]徐学燕,仲丛利,陈亚明,等.冻土的动力特性研究及其参数确定[J].岩土工程学报,1998,20(5):80-84.(Xu Xueyan,Zhong Congli,Chen Yaming,et al.Re-search on dynamic characters of frozen soil and determi-nation of its parameters[J].Chinese Journal ofGeotechnical Engineering,1998,20(5):80-84.(in Chi-nese))
[7]施烨辉,何平,卞晓玲.青藏铁路高温冻土动力学参数实验研究[J].路基工程,2006,(5):93-95.(ShiYehui,He Ping,Bian Xiaoling.Experimental study ondynamic machanical parameters of warm frozen soil ofQinghai-Tibet railway[J].Subgrade Engineering,2006,(5):93-95.(in Chinese))
[8]杨平,李强.冻土力学性能与声波参数相关性试验研究[J].岩土工程学报,1997,19(4):78-82.(YangPing,Li Qiang.Experimental study on mechanicalproperty and the relativity of acoustic parameter of frozensoil[J].Chinese Journal of Geotechnical Engineering,1997,19(4):78-82.(in Chinese))
[9]凌贤长,徐学燕,徐春花,等.冻结哈尔滨粉质粘土超声波速测定实验研究[J].岩土工程学报,2002,24(4):456-459.(Ling Xianzhang,Xu Xueyan,Xu Chun-hua,et al.Study on frozen Harbin silty clay though itsmeasuring tests of ultrasonic velocity[J].Chinese Jour-nal of Geotechnical Engineering,2002,24(4):456-459.(in Chinese))
[10]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.(Wang Lanmin,Zhang Dongli,Wu Zhi-jian,et al.The influence of earth temperature on dynam-ic characteristics of frozen soil and the parameters ofground motion on the sites of frozen Soil[J].EarthquakeResearch in China,2003,19(3):195-205.(in Chinese))
[11]高志华,赖远明,熊二刚,等.循环荷载作用下高温-高含冰量冻土特性实验研究[J].岩土力学,2010,31(6):1 744-1 750.(Gao Zhihua,Lai Yuanming,XiongErgang,et al.Experimental study of characteristics ofwarm and ice-rich frozen clay under cyclic loading[J].Rock and Soil Mechanics,2010,31(6):1 744-1 750.(in Chinese))
[12]Vision T S,Wilson C R,Bolander P.Dynamic proper-ties of naturaly frozen silt[D].PF:Proceeding of forthInternational Conference Press,1983.
[13]王大雁,朱元林,赵淑萍,等.超声波法测定冻土动弹性力学参数试验研究[J].岩土工程学报,2002,24(5):612-615.(Wang Dayan,Zhu Yuanlin,Zhao Shup-ing,et al.Study on experimental determination of the dy-namic elastic mechanical parameters of frozen soil by ul-trasonic technique[J].Chinese Journal of GeotechnicalEngineering,2002,24(5):612-615.(in Chinese))
[14]Vision T S.Geotechnical engineering in cold regions.[M].The United States of America:McGraw Hill BookCompany,Inc,1978.
[15]吴志坚,王兰民,马巍,等.地震荷载作用下冻土的动力学参数试验研究[J].西北地震学报,2003,25(3):210-214.(Wu Zhijian,Wang Lanmin,Ma Wei,et al.Laboratory study on dynamics parameters of frozen soilunder seismic dynamic loading[J].Northwestern Seis-mological Journal,2003,25(3):210-214.(in Chi-nese))
[2]Ladanyi B.An engineering theory of creep of frozensoils[J].Canadian Geotechnical Journal,1972,9(1):63-88.
[3]Ting J M.Tert iary creep model for frozen sand[J].ASCEN Journal of Geotechnical Engineering,1983,109(7):932-945.
[4]赵淑萍,朱元林,何平,等.冻土动力学参数测试研究[J].岩石力学与工程学报,2003,22(增2):2 677-2 681.(Zhao Shuping,Zhu Yuanlin,He Ping,et al.Testing study on dynamic mechanics parameters of frozensoil.Chinese Journal of Rock Mechanics and Engineer-ing,2003,22(Supp.2):2 677-2 681.(in Chinese))
[5]徐春华,徐学燕,邱明国,等.循环荷载下冻土的动阻尼比试验研究[J].哈尔滨建筑大学学报,2002,35(6):24-27.(Xu Chunhua,Xu Xueyan,Qiu Mingguo,et al.Experimental study on dynamic damping ratio offrozen soil under cyclic loading[J].Journal of HarbinUniversity of C.E.&Architecture,2002,35(6):24-27.(in chinese))
[6]徐学燕,仲丛利,陈亚明,等.冻土的动力特性研究及其参数确定[J].岩土工程学报,1998,20(5):80-84.(Xu Xueyan,Zhong Congli,Chen Yaming,et al.Re-search on dynamic characters of frozen soil and determi-nation of its parameters[J].Chinese Journal ofGeotechnical Engineering,1998,20(5):80-84.(in Chi-nese))
[7]施烨辉,何平,卞晓玲.青藏铁路高温冻土动力学参数实验研究[J].路基工程,2006,(5):93-95.(ShiYehui,He Ping,Bian Xiaoling.Experimental study ondynamic machanical parameters of warm frozen soil ofQinghai-Tibet railway[J].Subgrade Engineering,2006,(5):93-95.(in Chinese))
[8]杨平,李强.冻土力学性能与声波参数相关性试验研究[J].岩土工程学报,1997,19(4):78-82.(YangPing,Li Qiang.Experimental study on mechanicalproperty and the relativity of acoustic parameter of frozensoil[J].Chinese Journal of Geotechnical Engineering,1997,19(4):78-82.(in Chinese))
[9]凌贤长,徐学燕,徐春花,等.冻结哈尔滨粉质粘土超声波速测定实验研究[J].岩土工程学报,2002,24(4):456-459.(Ling Xianzhang,Xu Xueyan,Xu Chun-hua,et al.Study on frozen Harbin silty clay though itsmeasuring tests of ultrasonic velocity[J].Chinese Jour-nal of Geotechnical Engineering,2002,24(4):456-459.(in Chinese))
[10]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.(Wang Lanmin,Zhang Dongli,Wu Zhi-jian,et al.The influence of earth temperature on dynam-ic characteristics of frozen soil and the parameters ofground motion on the sites of frozen Soil[J].EarthquakeResearch in China,2003,19(3):195-205.(in Chinese))
[11]高志华,赖远明,熊二刚,等.循环荷载作用下高温-高含冰量冻土特性实验研究[J].岩土力学,2010,31(6):1 744-1 750.(Gao Zhihua,Lai Yuanming,XiongErgang,et al.Experimental study of characteristics ofwarm and ice-rich frozen clay under cyclic loading[J].Rock and Soil Mechanics,2010,31(6):1 744-1 750.(in Chinese))
[12]Vision T S,Wilson C R,Bolander P.Dynamic proper-ties of naturaly frozen silt[D].PF:Proceeding of forthInternational Conference Press,1983.
[13]王大雁,朱元林,赵淑萍,等.超声波法测定冻土动弹性力学参数试验研究[J].岩土工程学报,2002,24(5):612-615.(Wang Dayan,Zhu Yuanlin,Zhao Shup-ing,et al.Study on experimental determination of the dy-namic elastic mechanical parameters of frozen soil by ul-trasonic technique[J].Chinese Journal of GeotechnicalEngineering,2002,24(5):612-615.(in Chinese))
[14]Vision T S.Geotechnical engineering in cold regions.[M].The United States of America:McGraw Hill BookCompany,Inc,1978.
[15]吴志坚,王兰民,马巍,等.地震荷载作用下冻土的动力学参数试验研究[J].西北地震学报,2003,25(3):210-214.(Wu Zhijian,Wang Lanmin,Ma Wei,et al.Laboratory study on dynamics parameters of frozen soilunder seismic dynamic loading[J].Northwestern Seis-mological Journal,2003,25(3):210-214.(in Chi-nese))
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心