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Research on the Impact of Deformation and Destruction of the Diversion Tunnel Structure under Railway Operating

Author: TangZuo
Tutor: ZhaoFaSuo
School: Chang'an University
Course: Geological Engineering
Keywords: Diversion tunnel Vehicle Dynamic Load FLAC3D Structural deformation and failure analysis
CLC: TV554
Type: Master's thesis
Year: 2010
Downloads: 22
Quote: 0
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Abstract


With the rapid growth of China's national economy , the demand for infrastructure construction in China is increasing , especially in the construction and development of land transport and underground tunnel and underground engineering , the fastest , so inevitably there will be a railway through the existing tunnel . This situation is bound to affect the security and stability of the existing tunnel . In this paper, a diversion tunnel background , the use of explicit finite difference code FLAC3D simulation analysis of the structural stability of surrounding rocks in tunnels . First segment on the basis of the understanding of the study area engineering geology research hole stress analysis , simplify train vibration load , and according to the characteristics of the train vibration ; then determine the calculated parameters and calculate the conditions , and then choose the appropriate boundary conditions for the establishment of the calculation model . Before the construction of railway were studied three conditions of the diversion tunnel by the force of deformation and failure conditions and six kinds of railway construction by the force of the water diversion tunnel deformation and damage , Contrast studies train operations on the existing tunnel surrounding rock structure deformation damage the impact . Simulation , taking into account the changes in its combination of a variety of factors before and after the railway construction , mainly taking into account the normal operation and maintenance of the trains running and brake and Hydropower built nine kinds of combinations of conditions . Three typical profiles of these nine kinds of working conditions research tunnel section through explicit finite difference program FLAC3D computational simulation . Calculated for three different profile analysis diagram of the nine conditions the maximum tensile stress , maximum compressive stress map, displacement contours and plastic zone maps , and calculated data were analyzed and discussed , and come to the tunnel structure at the maximum the relationship between the tensile stress, the maximum compressive stress and the maximum displacement . Analysis study concluded given to predict the extent to which the cracks of the tunnel in some conditions , the need to repair cracks and ensure the tunnel work properly guiding significance , and several repair programs , after the tunnel structure design guiding significance for the design and construction of the tunnel and the railroad crossing .

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CLC: > Industrial Technology > Hydraulic Engineering > Hydraulic engineering construction > A variety of engineering,types > Tunnel and underground engineering
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