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Keywords: Umbrella
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Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-756
..., ground freezing, pre-vaults, and umbrella arch techniques. Of interest in this research effort is the spile support member, which falls under the collection of umbrella arch techniques. According to Oke et al. (2014), the umbrella arch is a temporary support system forming a structural umbrella around...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0271
... provide sufficient support for tunnels, using pre-reinforcement systems becomes necessary in addition to main support systems. Pre-reinforcement of weak ground is done before the excavation or ahead of advancing the tunnel. This will provide a safe and effective operation. Pipe roofing umbrella arch pre...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7452
... Abstract The mechanistic response of an Umbrella Arch (UA) support system that is used as a portion of the overall temporary support in poor tunneling conditions (weak/loose ground/subsidence prone zones) is not currently well understood. This paper compares existing empirical solutions...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-406
... members inserted sub-horizontally ahead and above the tunnel face in the longitudinal direction (i.e. along the axis of tunnel advance) as shown in Figure 1. Similar support structures are also cited in literature as pipe roofing [3], pipe roof support [4], pipe roof umbrella, steel pipe umbrella...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-976
... ABSTRACT: The increased use of pipe roof umbrella systems as a pre-support method necessitates the need for a standardized approach to determine the basic design parameters during design. The knowledge gained by in situ measurements using in place inclinometer chains were used to identify key...