【作者】 邓伟；

【导师】 胡幼常；

【作者基本信息】 武汉理工大学 ， 道路与铁道工程， 2006， 硕士

【摘要】 桥头跳车问题是高速公路的质量通病，尽管国内外对该问题已有不少研究，但一直未能得到很好的解决。随着我国高速公路建设形势的发展，从理论和实践上彻底解决这一问题刻不容缓。 本文在总结和分析国内外已有桥头跳车研究成果的基础上，结合我国高速公路建设实际情况，分析了导致我国高速公路出现桥头跳车问题的原因，对我国相应规范规定的桥头路基允许沉降值进行了探讨。通过建立简化跳车模型对桥头跳车现象进行的力学分析，认为路、桥相接处汽车荷载作用力较其对普通路面的作用力要大。 本文利用双向土工格栅对源自强风化红砂岩的粉砂土进行加筋，对压实度分别为90％、95％和100％，加筋层数分别为0、1、2、3和5的数组土样完成了室内回弹模量试验工作。总结并分析了双向土工格栅加筋层的布设位置、加筋层数、土的压实度等对回弹模量的影响规律。并且利用粉质红砂土修筑了一段双向土工格栅加筋路堤。试验路堤长度方向分4个区段，其中3段有双向土工格栅加筋，加筋的层间距分别为20cm、40cm和60cm，1段没有加筋。分别测定了这4个区段中点的路基回弹模量，发现双向土工格栅加筋路堤的回弹模量随加筋层间距的减小而提高，提高的幅度随层间距的减小而降低。 试验结果表明，合适的加筋方式和加筋层数、以及较高的压实度下，可以获得较高的回弹模量，从而为利用双向土工格栅加筋技术实现公路桥台台背与桥头路堤间刚柔的平顺过渡，控制桥头跳车的目的奠定了一定基础。更多还原

【Abstract】 Vehicle bumping at bridge-head is a common quality fault of theexpressways in our country. Though much work has been done about this at home and abroad, good method hasn’t been found yet. With the development of expressway construction in our country, it is urgent to solve this problem theoretically and practically.First, the existing achievements on this problem are summarized in the thesis, combined with the construction reality of our country the reasons lead to the bumping phenomenon are analyzed here and the tolerance settlement value of the embankment at bridge-head that regulated by the current criterion is discussed also. After analyzing the simplified vehicle bumping models built in this thesis, the conclusion that the auto load on the connecting part between the abutment is larger than that of embankment can be drawn.The author use the two-way tensioned geogrid to reinforce silt soil which comes from intense weathering red gritstone, finish the modulus of resilience experiment on samples of different degree of compaction and reinforcemental number of layers (degree of compaction:90%,95%,100%; number of layers: 0,1,2,3,5),Summarize and analyze the influence rule of the two-way tensioned geogrid location , numbers of layers and the degree of compaction on modulus of resilience. And use the red gritstone silt soil build an embankment which reinforced by two-way tensioned geogrid. It divided to four sections, three have been reinforced ,the space between each layer are 20cm, 40cm, 60cm ,the last section without reinforcement. Through mensurate modulus of resilience on the four sections, we find modulus of resilience on the embankment reinforced by two-way tensioned geogrid increase with the minish of the space between the layers ,but the increment rate is down.Outcome of the test show us the appropriate of reinforcemental way , the number of layers and degree of compaction can increase the modulus of resilience on embankment, which show that the technique of the two-way tensioned geogrid make the back of abutment and bridge-head embankment easy transition come true, and make progress on control the Vehicle bumping at bridge-head.更多还原