Construction and in-situ monitoring of large-span rock caverns under favourable stress conditions

Y. X. Zhou; J. Zhao; H. W. Song; K. S. Chew

doi:10.1016/j.ijrmms.2004.03.154

Construction and in-situ monitoring of large-span rock caverns under favourable stress conditions

Y. X. Zhou, J. Zhao, H. W. Song, K. S. Chew

Research output: Contribution to journal › Article › Research › peer-review

7 Citations (Scopus)

Abstract

The construction of large-span caverns in hard rock in a major underground storage project is discussed in this paper. In-situ stresses were measured using hydraulic fracturing and 3-D over coring during construction, showing a horizontal stress ratio of 2-3 times the vertical stress. Rock reinforcement design was based on the Q-system combined with numerical modelling for special design cases. Tunnel performance were checked and monitored by in-situ instrumentation, including deformation, convergence, and bolt load. A measuring borehole was drilled into the virgin rock before rock excavation, which provided a direct and very insightful comparison with various deformation measurements made during rock excavation. It has proven that the high horizontal stresses are very favourable to stability of the opening.

Original language	English
Journal	International Journal of Rock Mechanics and Mining Sciences
Volume	41
Issue number	SUPPL. 1
DOIs	https://doi.org/10.1016/j.ijrmms.2004.03.154
Publication status	Published - 1 May 2004
Externally published	Yes

Keywords

Horizontal stress
Large-span tunnel
Site monitoring
Stability

Access to Document

10.1016/j.ijrmms.2004.03.154

Link to publication in Scopus

Cite this

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title = "Construction and in-situ monitoring of large-span rock caverns under favourable stress conditions",

abstract = "The construction of large-span caverns in hard rock in a major underground storage project is discussed in this paper. In-situ stresses were measured using hydraulic fracturing and 3-D over coring during construction, showing a horizontal stress ratio of 2-3 times the vertical stress. Rock reinforcement design was based on the Q-system combined with numerical modelling for special design cases. Tunnel performance were checked and monitored by in-situ instrumentation, including deformation, convergence, and bolt load. A measuring borehole was drilled into the virgin rock before rock excavation, which provided a direct and very insightful comparison with various deformation measurements made during rock excavation. It has proven that the high horizontal stresses are very favourable to stability of the opening.",

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AU - Zhao, J.

AU - Song, H. W.

AU - Chew, K. S.

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AB - The construction of large-span caverns in hard rock in a major underground storage project is discussed in this paper. In-situ stresses were measured using hydraulic fracturing and 3-D over coring during construction, showing a horizontal stress ratio of 2-3 times the vertical stress. Rock reinforcement design was based on the Q-system combined with numerical modelling for special design cases. Tunnel performance were checked and monitored by in-situ instrumentation, including deformation, convergence, and bolt load. A measuring borehole was drilled into the virgin rock before rock excavation, which provided a direct and very insightful comparison with various deformation measurements made during rock excavation. It has proven that the high horizontal stresses are very favourable to stability of the opening.

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