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Spacial Effect of Tunnel Excavation and Its Application

Author: YinJianJun
Tutor: ZhangPing；CaoWenGui
School: Hunan University
Course: Geotechnical Engineering
Keywords: Horseshoe shaped tunnel Circular tunnel Convergence - side limit law FLAC3D Hoek-Brown criterion Longitudinal deformation curves for Empirical formula
CLC: U456.31
Type: Master's thesis
Year: 2009
Downloads: 149
Quote: 5
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Abstract


Surrounding rock deformation information of the tunneling process is not only issued directly Rock Excavation behavior function, but also an important parameter for the on-site construction process can be directly monitored. The designers an urgent need to know with the working face advancing the development of the surrounding rock deformation process of change in order to the rational design of the supporting structure;, construction workers need the part deformation monitoring data to make judgments on the total deformation of the surrounding rock stability . As convergence - one of the three most important part of the unconfined design method, the the tunnel longitudinal deformation law curve (LongitudinalDeformation Profile, LDP) can effectively reflect the evolution of the wall surrounding rock deformation with the tunnel face advance the process and can take this projection Wai rock deformation; However, the original circular tunnel under hydrostatic stress conditions full section excavation the longitudinal deformation law formulas apply to apply to stress next round and Horseshoe shaped tunnel complex full-face and partial excavation still the need for further research. Therefore, by means of suitable geotechnical engineering FLAC 3D numerical analysis software used can comprehensively consider the improvement of the rock mechanical properties and geological conditions of rock mass Hoek-Brown criterion selected rock mechanics parameters, longitudinal deformation under the curve of the circular tunnel and Horseshoe-shaped tunnel three-dimensional excavation carried out research on the different monitoring the amount of Cece point, the different initial stress conditions, different surrounding rock types, different cavern depth, different hole room high-span ratio, the different excavation manner affect under the curve of the variation of the in-depth analysis, further correspondence between normalized displacement coefficient with the tunnel face different influencing factors push position, as well as the size of the factors. On this basis, the full-face and up and down stairs by focus on Horseshoe-shaped tunnel excavation under lateral pressure coefficient and rock strength parameters longitudinal deformation curves for curve self similarity further simplify the effect of laws the description of the empirical formula to determine the law of comparative analysis, and finally the application of the formula and the Zipingpu water control project on-site monitoring of the diversion tunnel data. The comparison results show that the empirical formula is simple, to more accurately predict the deformation law. The results of this study have important guiding role for the understanding of the deformation law to determine the stability of surrounding rock and determine the timing of supporting.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel observations and experimental > Tunnel construction and use of monitoring > Cave ( the wall rock and lining ) deformation monitoring
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