交通荷载作用下低路堤软土地基室内模型试验研究

发布时间：2018-12-29 12:26

【摘要】：随着我国交通事业的高速发展,在软粘土地区建设的高等级公路也越来越多。针对低路堤软粘土地基上的公路,在路堤填土高度降低后,交通荷载未在路堤中得到充分扩散就传递到软土地基上这一实际工程问题,本文从交通荷载模拟,设计并制作了软土地基公路室内试验模型,开展了交通荷载不同影响因素对低路堤下软粘土地基动力响应和沉降分析方面的研究,通过对试验结果的分析总结了一些规律,这在今后软粘土地区低路堤高等级公路的建设方面具有重要的工程实际意义。论文主要内容如下:1、阅读收集大量文献资料,主要包括有交通荷载作用下路堤、路基动力响应方面及沉降变形方面的论文和交通荷载模型试验方面的文章,为试验方案的设计提供必要的理论依据和参考价值;2、开展了交通荷载的理论研究,通过对交通荷载的特点及简化方法等进行分析,提出了本试验中交通荷载的描述方法;并进一步研究了交通荷载对低路堤软粘土地基作用的分析;3、进行了室内模型试验的准备工作,包括材料准备、仪器调试、试验加载方案设计等方面的工作,为后续主要的交通荷载作用研究做好前期准备;4、根据试验结果简单分析了软粘土地基在静力作用下的沉降及孔压变化,重点研究了低路堤下软粘土地基在交通荷载单点激振时不同频率、不同强度、不同作用时间及双点激振时考虑轮载间的叠加效应对沉降变形、土压、孔压和加速度等的影响情况,并总结了一定的规律,为今后软粘土地区建设低路堤高等级公路等提供参考依据,具有一定的工程实际意义。
[Abstract]:With the rapid development of transportation in China, there are more and more high-grade highways in soft clay area. In view of the practical engineering problem of the highway on soft clay foundation of low embankment, when the height of embankment fill is reduced, the traffic load is transferred to the soft soil foundation without sufficient diffusion in the embankment. The indoor test model of soft soil foundation highway is designed and made, and the dynamic response and settlement analysis of soft clay foundation under low embankment are studied by different factors of traffic load, and some laws are summarized through the analysis of test results. This is of great engineering significance in the construction of high grade highway with low embankment in soft clay area. The main contents of the paper are as follows: 1. Reading and collecting a large number of documents, including the embankment under traffic load, subgrade dynamic response, settlement and deformation of the paper and traffic load model test. To provide the necessary theoretical basis and reference value for the design of the test scheme; 2. The theoretical study of traffic load is carried out, and the description method of traffic load in this experiment is put forward by analyzing the characteristics and simplified methods of traffic load. The effect of traffic load on soft clay foundation of low embankment is further studied. 3. The preparation work of indoor model test, including material preparation, instrument debugging, test loading scheme design and so on, is carried out to prepare for the following main traffic load research. 4. According to the test results, the settlement and pore pressure changes of soft clay foundation under static action are simply analyzed, and the different frequency and strength of soft clay foundation under single point excitation of traffic load under low embankment are studied emphatically. Considering the influence of superposition effect between wheel loads on settlement deformation, soil pressure, pore pressure and acceleration, when different action time and double point excitation are taken into account, some rules are summarized. It can provide reference basis for the construction of high grade highway with low embankment in soft clay area in the future, which has certain engineering practical significance.
【学位授予单位】：河北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.12

【参考文献】