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秦沈客运专线涵洞洞顶不同填土厚度试验研究
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摘要
本文结合铁道部秦沈客运专线综合试验科技攻关项目(合同编号:2000G48-F-2)——涵洞洞顶不同填土厚度试验研究这一科研课题而完成。秦沈客运专线是我国第一条客运专线,是按时速200公里以上设计的我国第一条双线电气化客运专线,它代表了当今中国铁路建设的最新建设理念和最高技术水平,体现了具有运行速度高、技术含量高、质量要求高和规程规范新、技术标准新、施工工艺新——“三高三新”的特点。高速铁路在我国还处在刚起步阶段,新建时速200公里客运铁路在我国尚属开创性工程,前无实践工程,对它的研究有待进一步深入。
     本文介绍了秦沈客运专线试验研究现状,介绍了涵洞洞顶不同填土厚度现场试验及其准备情况,分析了现场试验结果,讨论了涵洞洞顶不同填土厚度和列车速度对钢轨动应力、动土压力、盖板动应力以及行车安全性和舒适性的影响,得出列车高速运行情况下的涵洞动力系数和速度影响系数,并将试验结果与现有的研究成果进行了分析比较,采用有限元数值计算方法对涵洞在高速列车过载的情况进行了涵洞洞顶填土厚度优化计算,并将计算结果与试验结果进行了比较分析,最后提出了本文的结论,并提出相应的建议。
     通过对秦沈客运专线涵洞洞顶填土厚度的试验研究,可得出以下几点主要结论:1.涵洞盖板板顶填土厚度越高,列车运行的舒适度越高,但沉降越大;2.通过综合比较,填土厚度选择1.20m是个较合适的厚度;3.涵洞钢轨、盖板和土压力动力系数随填土厚度增加而减小;4.三维有限元计算采用的计算模型和计算参数合理,理论计算结果与模型试验结果吻合较好,计算结果可靠。
This thesis is completed on the basis of the Ministry of Railways'
    complex test--the study for different fill depth on the cover slabs
    of the culverts on Qinhuangdao-Shenyang dedicated passenger line. In China, the line is the first dedicated passenger line, which is also the first double-track, electrified and dedicated passenger line designed according to the speed of 200km/h. The line stands for the newest design ideas and the first classic technology level of our countries' railway construction and embodies the characteristics of "three high and three new" which are high speed, high technology content, high quality requirement, new regulations and specifications, new technical standard and new construction technology. High-speed railway is at the phase of start and the newly-constructed and dedicated passenger line designed according to the speed of 200km/his an creative engineering in China, that is, there is no existing analogous one. So it is worth of more studies.
    Firstly, the thesis introduces the studies of the tests on Qinhuangdao - Shenyang dedicated passenger line and also introduces the fields tests of different depth bankette on the cover slab of the culverts as well as their preparations on the line. Secondly, the thesis analyses the results of the field tests, discusses the influence of the different fills on the cover slab on the culverts and the speed of the trains for the dynamic stress of the steel of the steel rail, dynamic earth pressure, dynamic stress of the cover slab as well as running safety and comfort and then obtained the dynamic coefficient of the culverts and influence coefficient of the speed when trains run at high speed. Thirdly, the results of the test are compared and analyzed with existing research results, the finite element numerical method is adopted for computation for the optimal fill depth on the cover slab when the trains run at high speed on the culvert, and then the computation results are analyzed and compared with those of the
    
    
    
    tests. Finally, the conclusion are presented and some advice accordingly in the thesis.
    By studying the tests of the different depth fill on the cover slab of the culverts on Qinhuangdao - Shenyang dedicated passenger line, several principal conclusions are obtained as below:
    1. the fill on the cover slab of the culverts is more thick, trains run more comfortably on it by the settlement is more large;
    2. by complex comparing, 1. 2m is a relative reasonable thickness for the fills;
    3. the dynamic coefficients of the steel rail on the culvert, the cover slab and earth pressure get small with the fill being thick;
    4. the model and parameter adopted in the 3-D finite element computation are reasonable, the analytical results fit well with the results of the model test and the computation results are reliable.
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