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Earth pressure field modeling for tunnel face stability evaluation of EPB shield machines based on optimization solution

An, Yi and Li, Zhuohan and Wu, Changzhi and Hu, Huosheng and Shao, Cheng and Li, Bo (2020) 'Earth pressure field modeling for tunnel face stability evaluation of EPB shield machines based on optimization solution.' Discrete and Continuous Dynamical Systems: Series S, 13 (6). 1721 - 1741. ISSN 1937-1179

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Abstract

Earth pressure balanced (EPB) shield machines are large and complex mechanical systems and have been widely applied to tunnel engineering. Tunnel face stability evaluation is very important for EPB shield machines to avoid ground settlement and guarantee safe construction during the tunneling process. In this paper, we propose a novel earth pressure field modeling approach to evaluate the tunnel face stability of large and complex EPB shield machines. Based on the earth pressures measured by the pressure sensors on the clapboard of the chamber, we construct a triangular mesh model for the earth pressure field in the chamber and estimate the normal vector at each measuring point by using optimization solution and projection Delaunay triangulation, which can reflect the change situation of the earth pressures in real time. Furthermore, we analyze the characteristics of the active and passive earth pressure fields in the limit equilibrium states and give a new evaluation criterion of the tunnel face stability based on Rankine's theory of earth pressure. The method validation and analysis demonstrate that the proposed method is effective for modeling the earth pressure field in the chamber and evaluating the tunnel face stability of EPB shield machines.

Item Type: Article
Uncontrolled Keywords: Earth pressure, shield machine, normal vector, triangular mesh, tunnel face stability
Divisions: Faculty of Science and Health > Computer Science and Electronic Engineering, School of
Depositing User: Elements
Date Deposited: 09 Jun 2020 10:45
Last Modified: 09 Jun 2020 10:45
URI: http://repository.essex.ac.uk/id/eprint/27631

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