Study on mechanism of tunnel invert floor heave and the effect under vibration load of train

被引：0
|
作者：
Du M.-Q. [1 ,2 ]
Zhang S.-L. [1 ,2 ]
Zhang D.-L. [2 ]
Wang X.-C. [1 ]
机构：
[1] School of Civil Engineering, Qingdao University of Technology, Qingdao
[2] Key Laboratory for Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing
来源：
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | 2020年 / 33卷 / 01期
关键词：
Evolution mechanism; Floor heave failure mode; Soil dynamics; Train vibration load; Tunnel invert;
D O I：
10.16385/j.cnki.issn.1004-4523.2020.01.015
中图分类号：
学科分类号：
摘要：
To study the propagation characteristics and inquiry into the amplification effect of tunnel invert floor heave under vibration load of train, this article starts from the failure mode of floor heave under pressure of surrounding rock, based on the data from field measurement, used dynamically extended finite element model, study on the propagation law and characteristic of failure mode caused by the pressure of surrounding rock under train vibration load. The results show that the three main reasons affecting the floor heave are pressure of surrounding rock, structure features of tunnel invert, train vibration load. Failure modes of floor heave mainly include W type, LJ type, H type. Propagation law of tunnel invert floor heave is changed when the train vibration load is added, reduces the time of cracks through by 50% compared only the pressure of surrounding rock play a role with both train vibration load after 100 cycles and 25% after 10000 cycles. The gradient of contact pressure between surrounding rock and tunnel invert increased with the addition of train dynamic loads, the magnitude of increase is positively correlated with the number of dynamic load cycles. The research results can be a reference for the system design and vibration prevention of tunnel invert. © 2020, Nanjing Univ. of Aeronautics an Astronautics. All right reserved.
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页码：128 / 138
页数：10
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