交通荷载下低路堤路基的动力响应
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摘要
为分析交通荷载在低路堤及其路基中的扩散和传递变化规律,从路基土工程特性和耦合动力学的角度,建立路基动力分析耦合力学模型,推导出耦合运动方程,以江苏连盐高速公路为研究背景,探讨不同工况下路基的动力响应规律.结果表明:车重、路堤高度、加载方式、路面基层刚度对路基振动影响明显,而车速对路基的影响不大,并将数值解和现场实测值进行比较,验证了所建路基耦合动力模型及计算方法的可靠性.
To analyse the transmission rule of vehicle load in low embankment in view of the engineering characteristics of roadbed soil and coupling kinetics,a coupling mechanic model for dynamic analyses of roadbed is established.The differential equation for coupling motion is derived.Based on the background of Lianyungang-Yancheng Freeway in Jiangsu province,the variation laws of dynamic response of roadbed under different conditions are investigated.The calculational results show that the vehicle′s weight,height of embankment,mode of load and stiffness of base layer of pavement have prominent influences on the vibration of roadbed,but not the velocity.Through the comparison between the numerical values and the spot measured values,the reliabilities of constructed coupling dynamic model of roadbed and method of calculation are validated.
To analyse the transmission rule of vehicle load in low embankment in view of the engineering characteristics of roadbed soil and coupling kinetics,a coupling mechanic model for dynamic analyses of roadbed is established.The differential equation for coupling motion is derived.Based on the background of Lianyungang-Yancheng Freeway in Jiangsu province,the variation laws of dynamic response of roadbed under different conditions are investigated.The calculational results show that the vehicle′s weight,height of embankment,mode of load and stiffness of base layer of pavement have prominent influences on the vibration of roadbed,but not the velocity.Through the comparison between the numerical values and the spot measured values,the reliabilities of constructed coupling dynamic model of roadbed and method of calculation are validated.
引文
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[2]Huang Yu,Stephen F Brown,Glenn R Mcdowell.Dy-namic coupled analysis for rutting inflexible pavementfoundations under cyclic loading[J].Chinese Journal ofGeotechnical Engineering,2001,23(6):757-762.
[3]Kim S M,Roesset J M.Moving loads on a plate on e-lastic foundation[J].Journal ofEngineering Mechanics,1998,124(9):1010-1017.
[4]Gakenhemier D C,Miklowitz J.Transient excitation ofan elastic half-space by a point traveling on the surface[J].Journal of Applied Mechanics,ASME,Series E,1969,36(3):505-515.
[5]Hung HH,Yang Y B.Elastic waves in visco-elastichalf-space generated by various vehicle loads[J].SoilDynamics and Earth-Quake Engineering,2001,21:1-17.
[6]张选兵,罗先启,葛修润,等.双参数弹性地基上板承受冲击荷载的动力响应的解析解[J].岩石力学与工程学报,2001,20(6):846-850.ZHANG Xuan-bing,LUO Xian-qi,GE Xiu-run,et al.Analytical solution on dynamic response of rectangularplate with free edges on two parameters elastic founda-tion under inpact load[J].Chinese Journal ofRock Me-chanics and Engineering,2001,20(6):846-850.(inChinese)
[7]翟婉明.车辆-轨道耦合动力学[M].北京:中国铁道出版社,1997:12-22.
[8]范旭红,石启印,吴强.结构地震反应分析的状态空间法[J].江苏大学学报:自然科学版,2003,24(4):74-77.FAN Xu-hong,SHI Qi-yin,WU Qiang.State space e-quation method in the seismic response analysis[J].Journal ofJiangsu University:Natural Science Edition,2003,24(4):74-77.(in Chinese)
[9]杨群,黄晓明.基层模量对路面性能的影响分析[J].东南大学学报:自然科学版,2001,31(4):81-83.YANG Qun,HUANG Xiao-ming.Influence of roadbase′s module on pavement performance[J].Journal ofSoutheast University:Natural Science Edition,2001,31(4):81-83.(in Chinese)
[10]骆英,陶宝祺.土木工程智能结构中传感器原理与应用[J].江苏理工大学学报:自然科学版,2000,21(5):9-13.LUO Ying,TAO Bao-qi.Principle and application ofthe sensors used in civil engineering smart structures[J].Journal ofJiangsu University ofScience and Tech-nology:Natural Science Edition,2000,21(5):9-13.(in Chinese)
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