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Bulletin of Engineering Geology and the Environment

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02.04.2018 | Original Paper

Influence of fault zone on the respect distance and margin for excavation: a case study of the F4 fault in the Jijicao rock block, China

verfasst von: Peixing Zhang, Xiaozhao Li, Zhen Huang, Yangsong Zhang, Xihe Yao

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 4/2019

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Abstract

A high-level radioactive waste repository requires a rock mass to have good retardation properties. However, because a fault zone can be a potential seepage conduit for nuclides, its influence on the hydraulic conductivity of that fault zone must be assessed. Key sets of fractures were found based on an assessment of the statistical characteristics of fracture orientations and the tectonic analysis of a representative north–east fault in the Jijicao rock block in the Beishan region of Gansu Province, China. The trace midpoint density of each set was calculated using ArcGIS, a geographic information system, and a model of the hydraulic conductivity in the fault zone was developed based on a water pressure test and calculations, such that the respect distance and margin for excavation of this fault could also be determined. The calculated results show that the fault core and host rock are less conductive when the damage zone is 10- to 100-fold more conductive due to its greater density of fractures. The density is stable at 100 m, while the key set is stable until 65 m, and the calculated hydraulic conductivity is stable until 25 m; these results are consistent with the results of water pressure analysis.

Vorheriger Artikel Investigation of a methane flare during the excavation of the Silvan irrigation tunnel, Turkey

Nächster Artikel Impact protection of bridge piers against rockfall

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Titel: Influence of fault zone on the respect distance and margin for excavation: a case study of the F4 fault in the Jijicao rock block, China
verfasst von: Peixing Zhang
Xiaozhao Li
Zhen Huang
Yangsong Zhang
Xihe Yao
Publikationsdatum: 02.04.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: Bulletin of Engineering Geology and the Environment / Ausgabe 4/2019
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-018-1268-8

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