Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

The effect of dynamic loading on the shear strength of pyroclastic ash deposits and implications for landslide hazard : the case of Pudahuel Ignimbrite, Chile.

Sepúlveda, S.A. and Petley, D.N. and Brain, M.J. and Tunstall, N. (2016) 'The effect of dynamic loading on the shear strength of pyroclastic ash deposits and implications for landslide hazard : the case of Pudahuel Ignimbrite, Chile.', Engineering geology., 205 . pp. 54-61.

Abstract

The co-seismic and post-seismic behaviour of pyroclastic ash deposits and its influence on slope stability remains as a challenging subject in engineering geology. Case studies in volcanic areas of the world suggest that soil structural changes caused by seismic shaking results in landslide activity. It is critical to constrain how this kind of soil behaves during coseismic ground shaking, as well as the effects of dynamic loading on shear strength parameters after shaking. Direct shear tests carried out on cineritic volcanic materials from the Pudahuel Ignimbrite Formation in central Chile show a direct effect of cyclic loading on the shear strength and in a minor extent on the rheology. A high apparent cohesion found in monotonic shear tests, likely attributed to suction and cementation, is destroyed by dynamic loading. At the same time, the internal friction angle rises. This defines a differential post-dynamic behaviour depending on normal effective stress conditions, which favour the occurrence of shallow landslides. These results show how the use of shear strength parameters obtained from standard monotonic direct shear tests may produce misleading results when analyzing seismic slope stability in this type of soils.

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
Download PDF
(1265Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1016/j.enggeo.2016.02.005
Publisher statement:© 2016 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Date accepted:16 February 2016
Date deposited:08 March 2016
Date of first online publication:02 March 2016
Date first made open access:02 March 2017

Save or Share this output

Export:
Export
Look up in GoogleScholar