Research On Reasonble Net Spacing Of Highway Tunnel Under Seismic Dynamic Response

With the development at full speed of economic construction of our country, the construction of highway has occupied the important position in 4,000 billion latest central investment plans, especially will raise the new road construction climax to rebuild in the recovery of disaster area of Sichuan after the heavy earthquake of 5.12 Wenchuan, mountain tunnels in strong seimic regions will emerge in a large amount thereupon too. Make certain achievement on anti-seismic study in tunnel at present, but in strong seimic regions the research on the seismic dynamic response law of the neighboring tunnel is still not deep enough, the response characteristics of the structures of the neighboring tunnel and surrounding rock have not involving little also,how does construction factor influences the anti-seismic of the neighboring tunnel, all these are the key to influencing structure security question under seismic dynamic response of the neighboring tunnel. Directing against above-mentioned problems, this thesis is on the basis of analysing that the destructive shape and mechanism in the heavy earthquake tunnel of 5.12 Wenchuan, combine the numerical simulation ofseismic dynamic response, injection the evaluation index------yield approachindex, have done comparatively deep research to the reasonable net spacing of the neighboring tunnel. There is the following several respect in the main research that this thesis finishes:1. In the way that on-the-spot investigation , materials collect, have carried on research to the destructive shape and mechanism of the tunnels destroyed in " heavy earthquake of 5.12 Wenchuan ", have especially analys the tunnel destroyed seioursly which go through the fault. Analyse and summarize the universal law that the earthquake destroyed of the tunnel.2. In accordance with Class V ground of surrounding rock ,1:1 side face upward slope excavate slope rate , different net spacing of the neighboring tunnel has carried on numerical simulation research of seismic dynamic response, analyse and summarize the influence law of the net spacing impact on tunnels , and the reasonable net spacing of the neighboring tunnel under seismic dynamic response. At the same time according to the law of the respond of surrounding rock, focusing on the reasearch on the range of grouting in the section of the tunnel entrance.3.To simulating the tunnel while constructing suddenly influenced by the earthquake, coupling analysis constructing mechanics and seismic dynamic response of the neighboring tunnel to different net spacing, Probe into construction factor impacting on reasonable net spacing of the neighboring tunnel in strong seimic regions.