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http://dx.doi.org/10.9720/kseg.2014.2.227

Estimation of the Deformation Modulus for a Fault Zone using Crown Settlements Measured During Tunnel Excavation  

Yun, Hyun-Seok (Department of Earth and Environmental Sciences, Chungbuk National University)
Moon, Seong-Woo (Department of Earth and Environmental Sciences, Chungbuk National University)
Song, Gyu-Jin (Department of Earth and Environmental Sciences, Chungbuk National University)
Seo, Yong-Seok (Department of Earth and Environmental Sciences, Chungbuk National University)
Kim, Ji-Soo (Department of Earth and Environmental Sciences, Chungbuk National University)
Woo, Sang-Baik (Pyonghwa Geotec Co. Ltd.)
Publication Information
The Journal of Engineering Geology / v.24, no.2, 2014 , pp. 227-235 More about this Journal
Abstract
The deformation modulus is one of the essential factors in determining ground behavior and safety during tunnel excavation. In this study, we conducted a back-analysis using crown settlements measured during tunnel excavation, using a horizontal inclinometer on a fault zone of pegmatite, and calculated the deformation modulus of the fault zone. This deformation modulus calculation was then compared with deformation moduli found through established relationships that use the correlation between RMR and the deformation modulus, as well as the results of pressure-meter tests. The deformation moduli calculated by back-analysis differs significantly from the deformation moduli determined through established relationships, as well as the results from pressure-meter tests conducted across the study area. Furthermore, the maximum crown settlements derived from numerical analysis conducted by applying deformation moduli determined by these established relationships and the pressure-meter tests produced noticeable differences. This result indicates that in the case of a weak rock mass, such as a fault zone, it is inappropriate to estimate the deformation modulus using preexisting relationships, and caution must be taken when considering the geological and geotechnical characteristics of weak rock.
Keywords
tunnel; crown settlement; fault zone; deformation modulus; RMR;
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Times Cited By KSCI : 3  (Citation Analysis)
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