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Research of the Load Releasing Law during the Construction Process of Large Section Tunnel

Author: ZhaoYan
Tutor: LiShuCai
School: Shandong University
Course: Geotechnical Engineering
Keywords: Large section tunnel construction process Load release Carbonaceous shale Large - scale three-dimensional geomechanical model test
CLC: U451.2
Type: Master's thesis
Year: 2011
Downloads: 75
Quote: 2
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Abstract


Tunnel underground structures built in the initial state to a stable state formation, and the general ground structures, not limited to the structure of their exposure to the outside world load weight, but mainly from the excavation disturbance within the rock mass, that tunnel surrounding rock. Tunnel construction process in its structure withstand external loads, an ever-changing and the release process, help to understand the evolution of the stress state of the tunnel structure, through in-depth study of the law of tunnel construction process loads release further optimize the construction and tunnel stability determination is of great significance. Therefore, the load release pattern of tunnel construction process has been the focus of the study of the tunnel construction process mechanics and one of the hot. Through theoretical analysis and numerical simulation of indoor geomechanical tests combined study means, for your Canton Railway Tin Ping Shan tunnel engineering background related to the variation of the load in the large section tunnel construction process. Analyzed on the basis of the first after a lot of numerical simulation example, the radial stress releasing regularity of different construction methods during the excavation of the tunnel surrounding rock, clear the the wall different location surrounding rock radial stress release process, and on this basis put forward the concept and calculation method of the the tunnel section overall load release rate and load release difference coefficient, used to describe the cross-section of the overall load release state and not synchronized to reflect the same cross-section of different locations surrounding rock load release process. Followed by engineering and mechanical properties of carbonaceous shale taken from Tin Ping Shan tunnel targeted research, including the testing of conventional mechanical parameters and characteristics of rock acoustic emission in uniaxial compression test. Finally, on the basis of the laboratory test, carried out a majority-scale three-dimensional geomechanical model test study different engineering methods excavation of the tunnel wall and under the pressure of surrounding rock of the tunnel face in front of the release process. Better similarity carbonaceous shale rocks similar material model test process developed and successfully developed based on early lining similar material and applied to the model test, properly solve similar model test lining similar material is difficult to close fit with the rock mass similar material. Developed the inclined stratum filler device to achieve the similarity model body with original works on the stratigraphic architecture. Comprehensive comparative analysis of numerical simulation and laboratory test further clear the tunnel construction process loads (surrounding rock pressure) release law, a more profound understanding of the the load release characteristics step method of large cross section tunnel excavation process. Optimization and determination of construction, the assessment of tunnel structure stability reference. This study is the tunnel surrounding rock stability and control technology \

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CLC: > Transportation > Road transport > Tunnel project > Tunnel structure theory > Theory of tunnel surrounding rock
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