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Bulletin of Engineering Geology and the Environment
Published in: Bulletin of Engineering Geology and the Environment 9/2020

17-06-2020 | Original Paper

Characterization of a highly heterogeneous flysch deposit and excavation implications: case study from Auckland, New Zealand

Authors: B. Fleetwood, M. S. Brook, G. Brink, N. R. Richards, L. Adam, P. M. Black

Published in: Bulletin of Engineering Geology and the Environment | Issue 9/2020

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Abstract

Engineering geological characteristics of the rapidly growing Auckland urban area are of increasing interest due to ongoing and planned tunnels and excavations. Auckland is mainly underlain by Miocene-age East Coast Bays Formation (ECBF), a highly heterogeneous flysch deposit, and is also affected by lava flows from the Late Quaternary Auckland Volcanic Field (AVF). Therefore, excavations in the region can encounter highly variable rock mass. Here, the geological strength index (GSI) and rock mass rating (RMR) were applied to outcrop in coastal cliff exposures located on Auckland’s North Shore, to evaluate the engineering geological properties of the ECBF. Samples were also extracted for laboratory analysis of elastic wave velocities, intact strength parameters and thin section analysis of microtexture. Specific issues identified include lenses of the heavily zeolitized Parnell Volcaniclastic Conglomerate, and marked strength contrasts within the weaker ECBF siltstone and sandstone. The ECBF sandstone, where uncemented, is much weaker and is highly permeable, while the presence of smectite clay may be problematic for tunnelling if it disaggregates, forming a ‘sticky spoil’. The presence of larger-scale defects has been problematic for tunnelling, including the presence of low shear strength clay seams along ECBF bedding planes, and bedding planes intersecting tunnel crowns.
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Metadata
Title
Characterization of a highly heterogeneous flysch deposit and excavation implications: case study from Auckland, New Zealand
Authors
B. Fleetwood
M. S. Brook
G. Brink
N. R. Richards
L. Adam
P. M. Black
Publication date
17-06-2020
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 9/2020
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-020-01873-0

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