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Erschienen in: Bulletin of Engineering Geology and the Environment 4/2017

14.10.2016 | Original Paper

Modification of rock mass strength assessment methods and their application in geotechnical engineering

verfasst von: Daming Lin, Kaiyang Wang, Kun Li, Wantong He, Weixing Bao, Renmao Yuan, Yanjun Shang

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 4/2017

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Abstract

Due to complicated structures and discontinuities in surrounding rock mass, existing empirical failure criteria cannot meet the requirements of engineering practice such as tunnels. To improve estimation accuracy on the strength of rock mass with joints, a modified chart of the Geological Strength Index using Hoek–Brown criteria was further tested to estimate rock mass strength [Lin et al. (2014) Bull Eng Geol Environ 4(73):1245–1258], and, in this paper, new strength estimation equations for jointed rock mass were then modified based on a large dataset obtained from Chinese projects. Here, standard drilling time is first introduced and described in this study, and then used as a parameter to estimate rock strength. Different empirical formulas based on joint density, rock mass classification, Hoek–Brown criteria, and elastic wave velocity are thus used to estimate rock mass strength by using data from the Jiubao tunnel. The results estimated based on different empirical formulas were similar, indicating that the modified assessment method presented in this paper can be used to estimate rock mass strength under certain circumstances. Cross-correlation of different empirical methods provides significant confidence in predicted rock mass strength calculations.

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Metadaten
Titel
Modification of rock mass strength assessment methods and their application in geotechnical engineering
verfasst von
Daming Lin
Kaiyang Wang
Kun Li
Wantong He
Weixing Bao
Renmao Yuan
Yanjun Shang
Publikationsdatum
14.10.2016
Verlag
Springer Berlin Heidelberg
Erschienen in
Bulletin of Engineering Geology and the Environment / Ausgabe 4/2017
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-016-0952-9

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