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Experimental study on failure behaviour of deep tunnels under high in-situ stresses
Citation
Lin, P and Liu, H and Zhou, W, Experimental study on failure behaviour of deep tunnels under high in-situ stresses, Tunnelling and Underground Space Technology, 46 pp. 28-45. ISSN 0886-7798 (2015) [Refereed Article]
Copyright Statement
Copyright 2014 Elsevier
DOI: doi:10.1016/j.tust.2014.10.009
Abstract
Geomechanical model tests are conducted in this study to investigate the failure behaviour and instability
of the ‘‘large, deep, long and in-group’’ tunnels constructed in the Jinping II hydropower station. On
the basis of the experimental results, deformation, stress and failure analyses are conducted for the
tunnels under high in-situ stresses. It is concluded that: (1) The tunnels should be stable and the majority
of the rock mass remains intact even if the applied load is 1.3 P0, where P0 is the in-situ stress. The rock
mass around the excavations starts to crack when the applied load is 0.5–0.6 P0, and presents nonlinear
behaviour when the applied load is equal to the in-situ stress. (2) The displacement analysis indicates
that the maximum displacement is 108 mm at the crown along the excavation profile and 81.2 mm in
the rock mass 3 m far from the excavations. The obtained maximum displacements from the physical
model test are close to those later monitored in the field, although the physical model test is actually
conducted well before the construction of the tunnels. (3) The stress and failure analyses reveal that local
failures occur in the rock mass around the excavation forming local rockfalls but these local failures have
not accumulated to result in failures in massive area of the rock mass. There are no obvious cracking and
yield in the rock mass between the two tunnels, which indicates that the designed span of 60 m may be
feasible. (4) The geomechanical model test provides a means to understand the deformation, stress,
cracking and potential failure of the tunnels constructed in the Jinping II hydropower station, which
forms a basis for the subsequent 3D finite element modelling and construction process.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | geomechanical model test, deep tunnel, failure, high in-situ stress |
| Research Division: | Engineering |
| Research Group: | Resources engineering and extractive metallurgy |
| Research Field: | Geomechanics and resources geotechnical engineering |
| Objective Division: | Construction |
| Objective Group: | Construction processes |
| Objective Field: | Civil construction processes |
| UTAS Author: | Liu, H (Dr Hong Liu) |
| ID Code: | 96827 |
| Year Published: | 2015 |
| Web of Science® Times Cited: | 105 |
| Deposited By: | Engineering |
| Deposited On: | 2014-11-21 |
| Last Modified: | 2017-11-03 |
| Downloads: | 0 |
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