青藏铁路多年冻土区典型结构路基振动响应特性
|
摘要
在青藏高原的寒季和暖季条件下,对青藏铁路北麓河段的块石路基和素土路基进行了强震动测试,运用二维等价线性时程响应动分析法对2种典型结构路基进行了动力响应的数值计算.结果表明,从路肩到坡脚的机车荷载传递具有明显的衰减效应,并且暖季衰减大于寒季.在路基中心的原地表处,块石路基的振动衰减效应大于素土路基.
Different kinds of embankments are employed at permafrost regions along the Qinghai-Tibet Railroad.In order to obtain their dynamic response characteristics of typical structure embankments under the effect of train vibration loading at permafrost regions,strong motion observation tests were carried out,at warm and cold seasons of the Qinghai-Tibet plateau,at crushed rock embankment and plain fill embankment at the Beilu River segment.Based on these tests in situ,the dynamic finite element analysis method of two dimensions linearly equivalent was applied for dynamic response numerical calculation on these two embankments.The results show that there is an obvious damping effect during the transfer process from road shoulder to slope toe,the value of vibration attenuation in warm season is greater than that in cold season.And the vibration attenuation in crushed rock embankment is greater than that in plain fill embankment at center roadbed where natural ground locates.
Different kinds of embankments are employed at permafrost regions along the Qinghai-Tibet Railroad.In order to obtain their dynamic response characteristics of typical structure embankments under the effect of train vibration loading at permafrost regions,strong motion observation tests were carried out,at warm and cold seasons of the Qinghai-Tibet plateau,at crushed rock embankment and plain fill embankment at the Beilu River segment.Based on these tests in situ,the dynamic finite element analysis method of two dimensions linearly equivalent was applied for dynamic response numerical calculation on these two embankments.The results show that there is an obvious damping effect during the transfer process from road shoulder to slope toe,the value of vibration attenuation in warm season is greater than that in cold season.And the vibration attenuation in crushed rock embankment is greater than that in plain fill embankment at center roadbed where natural ground locates.
引文
[1]Mikhailov G P.Temperature regime of embankmentconsisting of coarse rock on permafrost[J].Transpor-tation Construction,1971,12:32-33.
[2]程国栋,童伯良,罗学波.厚层地下冰地段路堤建筑中的两个重要问题[J].冰川冻土,1981,3(2):6-11.CHENG Guo-dong,TONG Bo-liang,LUO Xue-bo.Two important problems of embankment constructionsin thick underground ice regions[J].Journal of Glaciol-ogy and Geocryology,1981,3(2):6-11.
[3]孙志忠,马巍,李东庆.青藏铁路北麓河试验段块石路基与普通路基的地温特征[J].岩土工程学报,2008,30(2):303-308.SUN Zhi-zhong,MA Wei,LI Dong-qing.Groundtemperature characteristics of block stone embankmentand traditional embankment at Beiluhe along Qinghai-Tibet railway[J].Chinese Journal of GeotechnicalEngineering,2008,30(2):303-308.
[4]吴志坚,车爱兰,陈拓,等.青藏铁路多年冻土区桥梁桩基础地震响应的试验研究与数值分析[J].岩土力学,2010,31(11):3516-3524.WU Zhi-jian,CHE Ai-lan,CHEN Tuo,et al.Teststudy and numerical analysis of seismic response of pilefoundation of bridge at permafrost regions along Qing-hai-Tibet railroad[J].Rock and Soil Mechanics,2010,31(11):3516-3524.
[5]周雍年.强震观测的发展趋势和任务[J].世界地震工程,2001,17(4):19-26.ZHOU Yong-nian.Developing trend and tasks ofstrong motion observation[J].World Conference onEarthquake Engineering,2001,17(4):19-26.
[6]李山有.强震动观测的应用[J].东北地震研究,2004,20(4):64-73.LI Shan-you.Application of the strong motion obser-vation[J].Seismological Research of Northeast China,2004,20(4):64-73.
[7]郑君里.信号与系统[M].2版.北京:高等教育出版社,2000:341-353.
[8]车爱兰,岩楯敞广,葛修润.关于地铁地震响应的模型振动实验及数值分析[J].岩土力学,2006,27(8):1293-1298.CHE Ai-lan,Iwatate Takahiro,GE Xiu-run.Dynamicbehaviors of subway structure subjected to strongearthquake motions using shaking table tests anddynamic analyses[J].Rock and Soil Mechanics,2006,27(8):1293-1298.
[2]程国栋,童伯良,罗学波.厚层地下冰地段路堤建筑中的两个重要问题[J].冰川冻土,1981,3(2):6-11.CHENG Guo-dong,TONG Bo-liang,LUO Xue-bo.Two important problems of embankment constructionsin thick underground ice regions[J].Journal of Glaciol-ogy and Geocryology,1981,3(2):6-11.
[3]孙志忠,马巍,李东庆.青藏铁路北麓河试验段块石路基与普通路基的地温特征[J].岩土工程学报,2008,30(2):303-308.SUN Zhi-zhong,MA Wei,LI Dong-qing.Groundtemperature characteristics of block stone embankmentand traditional embankment at Beiluhe along Qinghai-Tibet railway[J].Chinese Journal of GeotechnicalEngineering,2008,30(2):303-308.
[4]吴志坚,车爱兰,陈拓,等.青藏铁路多年冻土区桥梁桩基础地震响应的试验研究与数值分析[J].岩土力学,2010,31(11):3516-3524.WU Zhi-jian,CHE Ai-lan,CHEN Tuo,et al.Teststudy and numerical analysis of seismic response of pilefoundation of bridge at permafrost regions along Qing-hai-Tibet railroad[J].Rock and Soil Mechanics,2010,31(11):3516-3524.
[5]周雍年.强震观测的发展趋势和任务[J].世界地震工程,2001,17(4):19-26.ZHOU Yong-nian.Developing trend and tasks ofstrong motion observation[J].World Conference onEarthquake Engineering,2001,17(4):19-26.
[6]李山有.强震动观测的应用[J].东北地震研究,2004,20(4):64-73.LI Shan-you.Application of the strong motion obser-vation[J].Seismological Research of Northeast China,2004,20(4):64-73.
[7]郑君里.信号与系统[M].2版.北京:高等教育出版社,2000:341-353.
[8]车爱兰,岩楯敞广,葛修润.关于地铁地震响应的模型振动实验及数值分析[J].岩土力学,2006,27(8):1293-1298.CHE Ai-lan,Iwatate Takahiro,GE Xiu-run.Dynamicbehaviors of subway structure subjected to strongearthquake motions using shaking table tests anddynamic analyses[J].Rock and Soil Mechanics,2006,27(8):1293-1298.
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