青藏铁路多年冻土区机车荷载传递特性分析
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摘要
青藏铁路穿越大片的多年冻土区,其中为防止复杂冻土条件下产生冻土病害而采取了大量"以桥代路"的工程结构形式。为了把握青藏铁路多年冻土区机车振动荷载作用下铁路路基及桥梁桩基的动力响应特征,分别选取了典型路基结构和桥梁桩基结构进行了现场强震动测试。通过现场强震动测试得到了机车通过的实时加速度波形并对测试数据进行了加速度响应及傅里叶谱响应分析,得出铁路不同结构形式的振动响应衰减规律及振动能量的分布规律,同时得到了两种不同结构的固有频率特性。研究结果表明路基和桥梁结构在机车振动的传递方面均具有明显的衰减效应,其测试结果对于青藏铁路稳定性评价具有重要的科学意义。
The dry bridge,named bridge instead of embankment,has been widely adopted in regions with high temperature and instable permafrost or those with high ice content permafrost along the Qinghai-Tibet railroad.In order to obtain the dynamic response characteristics of typical embankments and dry bridges under the effect of vibration loads of trains in permafrost regions,strong motion tests on the filld embankment at the Beilu River segment and the bridge pile foundation of the Qingshui river Bridge in permafrost regions are carried out.The acceleration waveforms under running of freight and passenger trains are acquired from the tests,and the attenuation laws of vibration response,energy of vibration response and natural frequency are obtained by analyzing the acceleration response and FFT spectrum response.The test results show that there is an obvious damping effect during the transfer process.This study is of great significance to the stability analysis and prediction of the Qinghai-Tibet railroad.
The dry bridge,named bridge instead of embankment,has been widely adopted in regions with high temperature and instable permafrost or those with high ice content permafrost along the Qinghai-Tibet railroad.In order to obtain the dynamic response characteristics of typical embankments and dry bridges under the effect of vibration loads of trains in permafrost regions,strong motion tests on the filld embankment at the Beilu River segment and the bridge pile foundation of the Qingshui river Bridge in permafrost regions are carried out.The acceleration waveforms under running of freight and passenger trains are acquired from the tests,and the attenuation laws of vibration response,energy of vibration response and natural frequency are obtained by analyzing the acceleration response and FFT spectrum response.The test results show that there is an obvious damping effect during the transfer process.This study is of great significance to the stability analysis and prediction of the Qinghai-Tibet railroad.
引文
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[12]郑君里,应启珩,杨为理.信号与系统[M].2版.北京:高等教育出版社,2000.(ZHENG Jun-li,YING Qi-heng,YANG Wei-li.Signals and systems[M].2nd ed.Beijing:HighEducation Press,2000.(in Chinese))
[2]吴志坚,陈拓,马巍,等.青藏铁路多年冻土区典型结构路基振动响应特性[J].上海交通大学学报,2010,45(5):716-721.(WU Zhi-jian,CHEN Tuo,MA Wei,et al.Characteristics of vibration response of typical structureembankments at permafrost regions along the Qinghai-TibetRailroad[J].Journal of Shanghai Jiaotong University,2010,45(5):716-721.(in Chinese))
[3]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 Zhi-jian,WANG Lan-min,MA Wei,et al.Laboratory study on dynamics parameters of frozen soilunder seismic dynamic loading[J].NorthwesternSeismological Journal,2003,25(3):210-214.(in Chinese))
[4]程国栋.局地因素对多年冻土分布的影响及其对青藏铁路设计的启示[J].中国科学(D辑),2003,33(6):602-607.(CHENG Guo-dong.The impact of local factors onpermafrost distribution and its inspiring for designQinghai-Xizang railway[J].Science in China(Series D),2003,33(6):602-607.(in Chinese))
[5]张淑娟.静动荷载及冻融作用下冻土力学性质研究(博士学位论文)[D].北京:中国科学院研究生院,2007.(ZHANGShu-juan.Study on mechanical properties of frozen soilssubjected to static/dynamic loads and freeze-thaw cycles[D].Beijing:Graduate University of Chinese Academy ofSciences,2007.(in Chinese))
[6]吴志坚,王平,霍元坤,等.多年冻土区桥梁桩基础地震响应的模型振动试验研究[J].西北地震学报,2009,31(4):319-326.(WU Zhi-jian,WANG Ping,HUO Yuan-kun,et al.Study on shaking table test for seismic response of pilefoundation of bridges at the permafrost regions[J].Northwestern Seismological Journal,2009,31(4):319-326.(in Chinese))
[7]熊炜,刘明贵,张启衡,等.多年冻土区桩基温度场研究[J].岩土力学,2009,30(6):1658-1664.(XIONG Wei,LIUMing-gui,ZHANG Qi-heng,et al.Temperature distributionalong piles in permafrost regions[J].Rock and SoilMechanics,2009,30(6):1658-1664.(in Chinese))
[8]贾艳敏,郭红雨,郭启臣.多年冻土区灌注桩桩-冻土相互作用有限元分析[J].岩石力学与工程学报,2007,26(1):3134-3140.(JIA Yan-min,GUO Hong-yu,GUO Qi-chen.Finite element analysis of bored pile-frozen soil interactionsin permafrost[J].Chinese Journal of Rock Mechanics andEngineering,2007,26(1):3134-3140.(in Chinese))
[9]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 trendand tasks of strong motion observation[J].World Conferenceon Earthquake Engineering,2001,17(4):19-26.(inChinese))
[10]周雍年.中国大陆的强震动观测[J].国际地震动态,2006(11):1-6.(ZHOU Yong-nian.Strong motion observation inChinese continent[J].Recent Developments in WorldSeismology,2006(11):1-6.(in Chinese))
[11]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试验研究[J].地震工程与工程振动,2011,31(1):168-173.(CHEN Tuo,WU Zhi-jian,CHEAi-lan,et al.Test study on dynamic response of railroadembankment at the permafrost regions under train dynamicload[J].Earthquake Engineering and Engineering Vibration,2011,31(1):168-173.(in Chinese))
[12]郑君里,应启珩,杨为理.信号与系统[M].2版.北京:高等教育出版社,2000.(ZHENG Jun-li,YING Qi-heng,YANG Wei-li.Signals and systems[M].2nd ed.Beijing:HighEducation Press,2000.(in Chinese))
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