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Study on Fluid-Particle-Lining Efect and Sand Liquefaction under Vibration Load of High Speed Railway

Author: DaiLinFaBao
Tutor: GaoBo
School: Southwest Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: High-speed rail Sand Liquefaction Shield Tunnel Fluid-structure interaction
CLC: U451
Type: Master's thesis
Year: 2011
Downloads: 73
Quote: 0
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In the past decades , the high-speed rail for high-speed development in the countries of the world . As the train speeds increase , however , the high-speed train -induced environmental vibration problem has become particularly prominent . On the one hand , improve train speed train vibration loads will inevitably cause further increase , which put forward higher requirements on the dynamic stability of the tunnel structure . On the other hand , when the train operation , the load of train track - the tunnel structure spread to the surrounding soil , when the tunnel surrounding rock is saturated sands , the high-speed train vibration of saturated sand liquefaction , resulting in destruction of the tunnel structure , at the same time endanger the safety of the train running . The shield tunnel dynamic response of train vibrations therefore, important to the safe operation of the tunnel . In this paper, the Guangzhou-Shenzhen- Hong Kong Express Rail Shiziyang tunnel train vibration research projects , of Shield Tunnel train vibration dynamic response numerical simulation analysis , mainly includes the following research : (1) on the basis of previous studies , according to the train - rail system model , beam and plate models , analysis of the high-speed train by Ballastless track rail fulcrum pressure -time curve , load response for the three - dimensional tunnel train vibration power analysis provides an external stimulus . Sandy soil liquefaction mechanism and characteristics to determine the general guidelines of the judgment in the calculation and analysis process of sand liquefaction . (2) using numerical simulation to train vibration dynamic response on whether to consider groundwater impact study , train vibration problems come with groundwater must be taken into account fluid-structure interaction , and then for the same time the number of vehicles entering the tunnel , the rock mass parameters , tunnel depth of different response shield Tunnel train vibration power system study , analysis summary of the corresponding parameter changes affect the response of shield tunnel train vibration power law . (3) to shield tunnel entrance of the Guangzhou-Shenzhen -Hong Kong Express Rail Link Shiziyang as the prototype , create a detailed 3D analysis model from the single-column train through the tunnels and trains will cross through the tunnel two typical conditions , a high-speed train vibration segment under the settlement, the role of water - soil interaction and the possibility of sand liquefaction

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CLC: > Transportation > Road transport > Tunnel project > Tunnel structure theory
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