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Two-hole eight -lane highway tunnels with small spacing distance influence model test and field test

Author: ChengFangHui
Tutor: ChenShouGen
School: Southwest Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: Neighborhood tunnel Reasonable spacing Model test Field Test Two-hole eight -lane tunnel
CLC: U459.2
Type: Master's thesis
Year: 2011
Downloads: 47
Quote: 1
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Abstract


In mountainous terrain, such as narrow hilly regions or places with supporting the construction of road and bridge construction tunnel neighborhood tunnel tunnel is the most widely used forms. Abroad have built tunnels with small spacing mostly two-hole or three -lane dual carriageway , single hole within the span of 15m ; With the increasing volume of traffic , two-hole eight -lane highway tunnels with small spacing gradually built , single -hole span reach 20 ~ 23m, maximum height of 13m, section was seriously flat shape , structure stress , deformation is more complex , adjacent construction seriously affected . At home and abroad has built eight-lane tunnel hole double the number is still very small , relevant research and technology is very limited , the existing highway tunnel design and construction specifications are not related to the two-hole eight -lane tunnels with small spacing . On the two-hole eight -lane neighborhood tunnel conducted a systematic study of great significance. In this paper, the first domestic five pairs of holes eight -lane highway tunnel - Shenzhen Nanping Freeway ( two ) new home Tunnel project basis, using a combination of model tests , field tests , numerical simulation and other research methods , the following aspects were studied : ( 1 ) through eight small spacing model test conditions , the effects of different spacing conditions supporting radial deformation characteristics , supporting structure internal force distribution , and analysis of the deformation and internal forces change with the development of spacing law , and so determine grade Ⅳ surrounding neighborhood tunnel under the minimum reasonable spacing . ( 2 ) through eight small spacing condition model loading tests on different spacing conditions tunnel support failure modes and ultimate strength of the study , summed up the small spacing tunnel support the destruction of features. ( 3 ) through on-site testing, study underwent first hole tunnel excavation supporting structure for the force of impact , obtained grade Ⅲ , Ⅳ grade rocks underwent 30m hole spacing conditions on the first hole of the working face range and small spacing tunnel section analyzes the internal force distribution characteristics. ( 4 ) by means of numerical simulation of the model test and field test results were compared with verification and supplementary analysis .

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CLC: > Transportation > Road transport > Tunnel project > A variety of tunnel > Highway tunnel
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