软基沥青路面公路的超载损伤机理及预防
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摘要
通过在长江三角洲地区主要道路上选取对省际和区域内交通有代表性的段落进行车型组成及施荷参数的调查以分析超载超限运输以及与路面相关的各种主要特征,提出了路面设计应适应这些特征变化的调整方案。考虑道路超载的实际情况,利用有限元软件对软土地区沥青路面的路面结构进行了建模计算。通过建立二自由度汽车动力学模型分析了车辆在路面不平度作用下对路面的动载荷变化情况。介绍了地质雷达在软土地区沥青路面道路病害检测中的应用并给出了一些典型的波谱图片。通过对长江三角洲地区道路及市区道路早期破坏现象的分析,探讨了车辆超载对路面设计的影响并导出了适用于重载交通的相关设计参数。
To find out the characteristics of overloaded freight,an axle load survey on the representative highways in the delta of Yangtze River is made.On the basis of its result,the design process of heavy duty pavement is discussed.Considered the road overload situation,we carry on the modeling computation to the highway pavement structure by using finite element software.A two-degree of freedom vehicle dynamic model is deduced.The virtual excitation method and the high precision direct integration scheme are employed to calculate the vehicle dynamic load acting on road under pavement roughness.This paper briefly introduces the theory of the ground-penetrating radar method,discusses the application of the geological radar in the detection of the highway disease and finally analyzes the cause of the geological disaster formation.Through analysis of early failure of highway at the delta of Yangtze River,based on the observation result with axle load testing equipment,the influence of vehicle overload on pavement design is analyzed and the design parameters applicable for heavy traffic are educed.By analyzing the character of overloaded vehicles,a suitable contact model between overloaded freight and asphalt pavement was established.
To find out the characteristics of overloaded freight,an axle load survey on the representative highways in the delta of Yangtze River is made.On the basis of its result,the design process of heavy duty pavement is discussed.Considered the road overload situation,we carry on the modeling computation to the highway pavement structure by using finite element software.A two-degree of freedom vehicle dynamic model is deduced.The virtual excitation method and the high precision direct integration scheme are employed to calculate the vehicle dynamic load acting on road under pavement roughness.This paper briefly introduces the theory of the ground-penetrating radar method,discusses the application of the geological radar in the detection of the highway disease and finally analyzes the cause of the geological disaster formation.Through analysis of early failure of highway at the delta of Yangtze River,based on the observation result with axle load testing equipment,the influence of vehicle overload on pavement design is analyzed and the design parameters applicable for heavy traffic are educed.By analyzing the character of overloaded vehicles,a suitable contact model between overloaded freight and asphalt pavement was established.
引文
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[2]张锋,冯德成,凌贤长.季节冻土区车—路耦合作用下路面动力响应数值模拟研究[J].中国科技论文在线,2010,5(10):797-801.Zhang Feng,Feng Decheng,Ling Xianzhang.Numerical simulation of pavement dynamic response induced by interaction of vehicle-road system in seasonally frozen region[J].Sciencepaper Online,2010,5(10):797-801.(in Chinese).
[3]Gnanendran C T,Selvadurai A P S.Strain measurement and interpretation of stabilizing force in geogrid reinforcement[J].Geotextiles and Geomembranes,2001,19(3):316-321.
[4]Carter J P,Small J C,Booker J R.A theory of finite elastic consolidation[J].Int J Solids Structures,1977,13(5):467-478.
[5]王立娜,凌贤长,张峰,等.大庆季节冻土区冬季铁路列车行驶振动反应现场监测研究[J].中国科技论文在线,2009,4(7):507-511.Wang Lina,Ling Xianzhang,Zhang Feng,et al.Field monitoring on vibration acceleration response of railway in seasonal frozen regionof Daqing induced by train-steering in winter[J].Sciencepaper Online,2009,4(7):507-511.(in Chinese).
[6]李峻岩,万亦强,赵旗,等.军用汽车振动性能的仿真[J].中国科技论文在线,2010,5(10):807-812.Li Junyan,Wan Yiqiang,Zhao Qi,et al.Vibration performance simulation of military automobile[J].Sciencepaper Online,2010,5(10):807-812.(in Chinese).
[7]Han Yong Jeon,Seong Hun Kim,Han Kyu Yoo.Assessment of long-term performances of polyester geogrids by accelerated creep test[J].Polymer Testing,2002,21(5):1211-1217.
[8]Itasca Consulting Group Inc.FLAC2D(Fast Lagrangian Analysis is of Continua)Version5.0Structural Elements[M].USA:Itasca Consulting Group Inc,2005.
[9]Itasca Consulting Group Inc.FLAC3D(Fast Lagrangian Analysis is of Continua in3Dimensions)Version3.0User’s Guide[M].USA:Itasca Consulting Group Inc,2005.
[10]Itasca Consulting Group Inc.FLAC2D(Fast Lagrangian Analysis is of Continua)Version5.0User’s Guide[M].USA:Itasca Consulting Group Inc,2005.
[11]Itasca Consulting GroupInc.FLAC3D(Fast Lagrangian Analysis of Continua in3Dimensions)Version5.0Structural Elements[M].USA:Itasca Consulting Group Inc,2005.
[12]姚洪锡,苏谦,陈潇.青藏线多年冻土区斜坡路基地震稳定分析及抗滑措施研究[J].中国科技论文在线,2009,4(7):512-516.Yao Hongxi,Su Qian,Chen Xiao.Earthquake stablity analysis and research on skid-resistance measures of permafrost sloping embankment on Qinghai-Tibet Railway[J].Sciencepaper Online,2009,4(7):512-516.(in Chinese)
[13]John Krahn.Stress and Deformation Modeling with SIGMA/W(An Engineering Methodolgy)[M].Canada:GEO-SLOPE International,Ltd,2004.
[14]Lin J H,Zhang W S,Williams F W.Pseudo-excitation algorithm for non-stationary random seismic responses[J].Engineering Structures,1994,16(4):270-276.
[15]Sugimoto M.Influence of rigid and flexible face on geogrid pullout tests[J].Geotextiles and Geomembranes,2001,19(5):257-277.
[16]Sebaaly Peter E,Tabatabee Nader.Effect of tire parameters on pavements damage and load-equivalency factors[J].Journal of Transportation Engineering,1992(6):32-37.
[17]Austin R A,Gilchrist A J T.Enhanced performance of asphalt pavements using geocomposites[J].Geotextiles and Geomembranes,1996,14(3/4):157-161.
[18]Brinkgreve R B J,Vermeer P A.PLAXIS3D Tunnel Reference Manual[M].Netherlands:A.A.Balkema Publishers,2001.
[19]Brinkgreve R B J.PLAXIS2D-version8Reference Manual[M].Netherlands:A.A.Balkema Publishers,2002.
[20]Woods Rick,Rahim Amir.SAGE-CRISP Technical Reference Manual(For use with SAGE-CRISP version4)[M].UK:The CRISP Consortium Ltd,2001.
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