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Application of Displacement Back Analysis of Taking into Loosing Zone for Tunnel Engineering

Author: LiHongBo
Tutor: GaoGuangYun
School: Tongji University
Course: Geotechnical Engineering
Keywords: Loose circle Displacement back analysis Tunnel Dual - medium model Gravel Inversion positive operator
CLC: U451
Type: Master's thesis
Year: 2006
Downloads: 380
Quote: 3
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Abstract


More and more displacement back analysis in geotechnical engineering . Displacement back analysis due to the complexity of the project , the tunnel project will encounter a lot of problems . This paper systematically introduces displacement back analysis method for the study of the history and the status quo , inductive displacement back analysis theory and finite element implementation of elastoplastic problems , on this basis , consider a loose circle back analysis of displacements in the tunnel project application . First, expounded the necessity to consider the rock loose circle displacement back analysis application in tunnel excavation , discusses the realization of the loose circle model displacement back analysis method , introduced dual media model . Introduction to the general methods of detection rock loose circle . Combined with the characteristics of the gravel strata , indicating the importance of a loose circle model , as well as how to determine the size of the rock loose circle in the actual calculation . Secondly , the use of ANSYS software to create three-dimensional model of the tunnel excavation and study in all directions of the stress of displacement , as the basis of information input displacement value should be how to fix the plane strain problem . The positive operators introduced inversion method used to verify the effect of displacement back analysis applied to the tunnel informational construction . General steps displacement back analysis of tunnel and underground engineering . Finally , to Ning Chang Expressway under construction Maoshan tunnel project , for example , the displacement calculation . Calculated using the rock zone dual - medium model , the inversion of the elastic modulus of the loose circle . And inversion parameters being analyzed , and construction.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel structure theory
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