【作者】 梁冠军；

【导师】 钟才根； 张鹏飞；

【作者基本信息】 同济大学 ， 岩土工程， 2007， 硕士

【摘要】 道路路基是路面的支撑结构物，对城市道路而言，由于路基填土厚度有限，且较多都是零填路基，沥青路面在使用过程中所出现的沉陷、车辙和裂缝等损坏，虽然一部分是由于路面各结构层本身的变形所引起，但相当大部分是路基过量的塑性变形所造成的。路基的变形可区分为三种类型：交通荷载反复作用下产生的累积塑性变形，填土自重荷载下的压密沉降及固结沉降。本文主要对路基在交通荷载作用下的动力响应和累积塑性变形展开研究。 本文主要内容分四部分： 目前我国《公路沥青路面设计规范》中规定路面结构各层均处于完全连续的界面条件，实际道路使用过程中，界面条件经常是部分连续甚至是滑动的。本文第一部分分别考虑界面接触条件为连续和滑动，以沥青路面在使用过程中所出现的沉陷、车辙和裂缝等早期损坏现象为主线，采用弹性层状体系理论对路基路面结构各层进行了静力分析。 第二部分以我国典型的城市道路路基路面结构为模型，采用三维动力有限单元法分别从三个不同的角度研究了车辆荷载的超载率，车速和车轴数对城市道路路基动力响应的影响。 针对交通荷载反复作用下路基产生的累积塑性变形问题，第三部分采用累积塑性应变的经验公式结合本文第二部分的应力分析方法，采用分层累积方法计算路基总的塑性变形，并以美国加州车道试验(CAL/APT)501RF段道路试验数据为根据，对本文的计算方法进行了实例验证。 最后，本文对上海地区软土路基在交通荷载作用下的残余变形问题做了分析，并采用平面应变弹塑性有限元法分析了路基残余变形对路面开裂的影响。更多还原

【Abstract】 The subgrade is the support of the pavement structure. Speaking of the urban road, the height of the earth fill is limited and many of them have no embankments .The pavements damage such as settlement, rutting and crack which appear in the using process, partly because of the pavements structure deformation by themselves, but quite majority are induced by excessive plastic deformation of the subgrade soils. The subgrade deformation mainly come from soil self-weight compaction, soil consolidation and accumulative plastic deformation under vehicle load. This thesis presents a research on dynamic response and plastic deformation of the subgrade soils under vehicle load.Four parts are included in this thesis as follows:At present , "Specifications of asphalt concrete pavement" JTJ014-97 has stipulated that each contact surface condition of the pavement structure are completely continuous .In fact ,some contact surface conditions among the pavement structure are partial continuous or even glide. In the first part, static analysis of the pavement structure is discussed by elastic layered system theory with the forepart damage phenomena of the pavement explained above.In the second part ,the numerical model of urban road in our country is built and dynamic response of the subgrade soils influenced by moving dynamic vehicle load is studied by three-dimensional, dynamical finite element program. It has been studied in three different views such as the vehicle overload rate, vehicle speed and the number of axle which influence the result of subgrade soils dynamic response separately.Using an empirical cumulative plastic strain formula ,in the third part ,a method for calculating cumulative plastic deformation of the subgrade soils induced by vehicle load was proposed combined by the stress result gained in the second part. At the end of this part, taking the 501RF part of caltrans accelerated pavement test (cal/apt) program in California for example ,the validity of the method is confirmed. Finally, the residual deformation of soft clay subgrade in Shang Hai under更多还原