Study Of Simulation On The Interaction Mechanism Of Road Tunnel Shed-hole Structure And Slope

With the development of the highway construction, urban road can basically meet thepeople’s access travel requirements, and highway construction expends to mountain area.China is a mountainous country, mountain highway tunnel began to appear andgradually develop toward longer and greater direction. During the rapid development ofmountain highway tunnel, reducing excavation and backfill, protection of the highwaylandscape and ecological maintenance have become the guidelines.Shed hole has an important role in the mountain road environment and disasterprevention and mitigation. The structure which is adopted according to the naturaltopography,such as shed-tunnel or half-tunnel, should be adopted to protect the naturalenvironment and slope in the complicated zone combining anchor-shotcrete withshed-tunnel structure,reasonable and complete supporting system of the slope wasformed.Based on the actual conditions of highway No.6shed-tunnel in Chongqing, researchon environmentally friendly construction techniques has been carried out on thehighway.According to interaction mechanism of shed-tunnel and backfill andsurrounding rock, through the groups of different surrounding rock and backfilling,comparativeiy analyze the different effect of shed-tunnel structure.Main research work of this thesis is as follows:First, summarize potential data of shed-tunnel at home and abroad in recent years,Comparative analysis the economy and possibility of the cutting scheme, tunnel withoutcover scheme and shed-tunnel scheme in along driver high road engineering.Shed-tunnel not only decrease earthwork, but also could integrate nature easily.Second, taking the half arch inclined column shed-tunnel for example, throughdifferent classification on the slope and backfilling, establish physical mechanicalmodel about shed-tunnel. Use the finite element software--Midas/GTS, comparing themechanical characteristics of shed tunnel structure in different conditions, giving thereasonable supporting and backfilling combination to design and construction.Third, based on engineering of the shed tunnel model experiment indoor, through thedifferent groups according to different surrounding rock and backfilling, compare thestress characteristics of shed-tunnel under different conditions, In order to provide thebest combination of backfilling and slope ratio, then supporting the design and construction.Studies have shown that: in the same slope conditions, compared debris backfill andrubble backfill, the internal force of shed-hole structure is greater; soil slope relative torock slope, shed tunnel structure take greater the influence of the backfill material. Withthe same slope and the slope stability, soil slope relative to the rock slope, shed tunnelstructure internal force is greater.The biggest internal force appeared in inclined column of the structure, followed bythe curved-wall plate, finally the joist. The bigger internal force appeared in inclinedcolumn section than mid-span position for the curved-wall plate. Inclined columnissubjected of extrapolation moment, compared with bottom position, the internal forceis smaller than top position.