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Sustainability 2017, 9(4), 573; doi:10.3390/su9040573

A Study on Rock Mass Classifications and Tunnel Support Systems in Unconsolidated Sedimentary Rock

1
Department of Civil, Environmental, and Construction Engineering, Texas Tech University, Lubbock, TX 79409, USA
2
Department of Civil and Environmental Engineering, Yonsei University, Seoul 03722, Korea
*
Author to whom correspondence should be addressed.
Received: 2 December 2016 / Revised: 27 March 2017 / Accepted: 6 April 2017 / Published: 9 April 2017
(This article belongs to the Section Sustainable Engineering and Science)
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Abstract

This paper presents new valuable field data and a comprehensive approach to the determination of the rock mass classification and tunnel support systems for tunnels in unconsolidated sedimentary rocks as a special soil condition. The main objective of this study is to investigate and present the characteristics of the unconsolidated sedimentary rock by using the point load tests and slake durability tests. In addition, the appropriate rock mass classification and tunnel support system for the unconsolidated sedimentary rock tunnel are proposed, based on the results of experimental tests. The proposed rock mass classification and tunnel support system are validated through comparison against results from measuring the convergence of a tunnel under the construction. The proposed tunnel support system is appropriate for the unconsolidated sedimentary rocks, since the convergence factors, such as the maximum displacement and velocity of displacement, satisfy the criteria. View Full-Text
Keywords: rock mass classifications; unconsolidated sedimentary rock; point load test; slake durability test; tunnel support system rock mass classifications; unconsolidated sedimentary rock; point load test; slake durability test; tunnel support system
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ko, J.; Jeong, S. A Study on Rock Mass Classifications and Tunnel Support Systems in Unconsolidated Sedimentary Rock. Sustainability 2017, 9, 573.

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