The MIIS Eprints Archive

Interfacial Behaviour in Tunnel Engineering

Bohun, C. S. (2008) Interfacial Behaviour in Tunnel Engineering. [Study Group Report]



The stress induced in an underground tunnel due to the applied stress of a tunnel boring machine (TBM) is studied to understand the mechanisms which lead to tunnel collapse. An investigation of the classical plane strain gravitational problem in a purely elastic medium shows that any fractures due to gravitational effects alone would occur at the base of the tunnel rather than the apex. Ignoring gravity we then explore an elastic/plastic solution in an idealized soil with no cohesion. To simulate the action of the TBM a point source is imparted on the medium extending in the horizontal direction. This model decouples into an elastostatic problem that predicts a wedge shaped region of plasticity extending from the point source and a hyperbolic flow problem in the plasticized region. Using a similarity solution, it is shown that the behaviour of the medium is very sensitive to the parameters that characterize the soil.

Item Type:Study Group Report
Problem Sectors:Transport and Automotive
Machines / Production
Study Groups:Canadian Industrial Problem Solving Workshops > FM-IPSW 2008 (Toronto, Canada, Aug 11-15, 2008)
Company Name:Northern Heavy Industries Group Co., Ltd.
ID Code:573
Deposited By: Mark Curtis
Deposited On:29 Feb 2012 18:42
Last Modified:29 May 2015 20:11

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