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Monitoring and Numerical Simulation of Construction Wall Rock on Super Section Multi-arch Tunnel

Author: YueQiXian
Tutor: HuoRunKe
School: Xi'an University of Architecture and Technology
Course: Bridge and Tunnel Engineering
Keywords: Four arched Dual sidewall guide pit ANSYS Monitoring and Measurement Numerical Analysis
CLC: U455.4
Type: Master's thesis
Year: 2011
Downloads: 65
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Abstract


With the expansion of the city , urban traffic congestion has become one of the major issues facing the major cities . Underground railway project as an important part of the urban rail transport , with large volume , pollution does not affect ground transportation , etc. , by urban policy-makers of all ages . Shallow Soil Tunnel of Harbin subway Hanan Station ~ Academy of Agricultural Sciences station interval four arched segment belongs to a large cross-section , the use of double sidewall drift method for the construction , paper engineering for background on the different construction stages of surrounding rock deformation monitoring and numerical simulation analysis . Firstly, two-dimensional finite element analysis of the construction process of the project using ANSYS11.0 Software using Durcker-Prager yield criterion , to study dual sidewall drift method at different stages of construction surrounding rock deformation law obtained in the construction process stability and stress state of the surrounding rock and supporting structure . Study found that in the four - arch tunnel on the left and right side of the tunnel , as well as in the pilot tunnel construction process to produce a displacement of about 80 % ; parts of the vault and the arch of the tunnel surrounding rock stress concentrated area , most likely in this destruction; arching up and down the line and in the pilot tunnel dome part of the region σ1 four with a tensile stress phenomenon , but as the calculations are performed , the tensile stress gradually disappear , and force the state to improve . Second, the implementation XK1 450 sectional monitoring and measurement, analysis and monitoring results to collate . On surface subsidence , the analysis and judgment of the crown settlement and clearance convergence monitoring data , found that the deformation of surrounding rock from the tunnel face doubled Diameter within one to three times the hole diameter change rate decreases , three times the hole diameter stabilized later . Finally , by comparing the finite element analysis results and monitoring data results of the four arched tunnel deformation law is summarized .

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Construction methods
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