eprintid: 573
rev_number: 11
eprint_status: archive
userid: 10
dir: disk0/00/00/05/73
datestamp: 2012-02-29 18:42:12
lastmod: 2015-05-29 20:11:45
status_changed: 2012-02-29 18:42:12
type: report
metadata_visibility: show
item_issues_count: 0
creators_name: Bohun, C. S.
corp_creators: Zongxi Cai
title: Interfacial Behaviour in Tunnel Engineering
ispublished: pub
subjects: transport
subjects: machines
studygroups: fmipsw2
companyname: Northern Heavy Industries Group Co., Ltd.
full_text_status: public
abstract: 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.
date: 2008
citation:   Bohun, C. S.  (2008) Interfacial Behaviour in Tunnel Engineering.  [Study Group Report]     
document_url: http://miis.maths.ox.ac.uk/miis/573/1/6.pdf