【作者】 魏宝军；

【导师】 赵军； 刘忠玉；

【作者基本信息】 郑州大学 ， 建筑与土木工程， 2012， 硕士

【摘要】 本文结合郑民高速公路项目,针对高速公路粉砂土路基的技术特点,首先分析了粉砂土的动力特征,然后对本文计算方法进行了介绍,接着系统分析了粉砂土路基在地震荷载、汽车、飞机作用下的动力响应,得到以下结论：在汽车荷载作用下,边坡内孔隙压力、位移以及应力随着加载频率的增加,车轮下一定范围内的孔压累积加快,有效应力相应减小,边坡位移增大,且坡面上的点更多地向坡内位移；飞机荷载作用下孔隙水压和位移随加载频率和加载次数的增大而增大,且边坡顶部产生向坡内的水平位移；另外,边坡内的瞬时屈服区或破坏区随加载频率的增大而扩大；随着地震加速度峰值的增加,路堤内拉力区和屈服区的范围增大,液化出现的可能性也增大。特别地指出,当地震加速度达到0.1g时,并不能完全排除路基土液化的可能性。最后通过室内模型试验验证了数值计算分析结果的合理性,揭示了高速公路粉砂土路基的动力响应特性。在我国,水力成因的粉砂土广泛分布于冲积平原、河流三角洲、沿海平原地区,因此粉砂土路基的高速公路在我国必将得到广泛应用。本文研究结论将对河南及国内高速公路粉砂土路基的设计及施工控制提供有益的参考和工程实践指导,对确保高速公路的修筑质量、延长使用寿命具有重要意义,应用前景广泛。更多还原

【Abstract】 Combining Zhengmin Highway Project, this paper firstly analyzed the dynamic characteristics of the silty soil in view of the technique characteristics of highway with silty soil roadbed, then introduced the adopted calculation methods in the paper, and systematically analyzed the dynamic response of the silty soil roadbed under the actions of the earthquake loading, autos and airplanes. It came to conclusions as follows:under the actions of autos loading, the pore pressure, displacement and stress of the slope increased with the enhanced loading frequency. Within the limits underneath the wheels, the pore pressure speeded up the accumulation, the effective stress reduced relatively, and the slope displacement augmented, the points on the slope displaced more towards the inner slope; under the actions of the airplane loading, the pore water pressure and displacement augmented with the increasing loading frequency and times, and the top of the slope caused the horizontal displacement towards the inner slope; in addition, the transient yield or the destruction region of the slope enlarged with the increasing loading frequency; with the increasing earthquake acceleration peak, the tension and yield region range of the road embankment augmented, and the possibility of the liquidity was increased as well. It specially pointed out that the liquefaction possibility of the roadbed soil couldn’t be excluded completely when the earthquake acceleration reached0.1g. Finally, it validated the analysis result rationality of the value calculation by the indoor model experiment, and disclosed the dynamic response characteristics of the highway with silty soil roadbed.In our country, silty soil caused by the hydraulic power is widely distributed in alluvial plain, river delta and coastal plain zone,Therefore, silty soil roadbed must be widely applied in our country. The research conclusion in this paper will provide some beneficial reference for the design of the silty soil roadbed in Henan and other domestic highway, as well as its construction control and put forward the practical instruction in the projects. It possesses the vital significance to assure the building quality of the road and extend the service life. The application prospect is wide.更多还原