The Pico de Navas slump (Burgos, Spain): a large rocky landslide caused by underlying clayey sand

Sanz Pérez, Eugenio ORCID: https://orcid.org/0000-0002-1178-1119, Menéndez Pidal de Navascués, Ignacio ORCID: https://orcid.org/0000-0002-7053-1101, Lomoschitz Mora-Figueroa, Alejandro and Galindo Aires, Rubén Ángel ORCID: https://orcid.org/0000-0001-9407-9183 (2016). The Pico de Navas slump (Burgos, Spain): a large rocky landslide caused by underlying clayey sand. "Journal of Iberian Geology", v. 42 (n. 1); pp. 55-68. ISSN 1886-7995. https://doi.org/10.5209/rev_JIGE.2016.v42.n1.49727.

Description

Title: The Pico de Navas slump (Burgos, Spain): a large rocky landslide caused by underlying clayey sand
Author/s:
Item Type: Article
Título de Revista/Publicación: Journal of Iberian Geology
Date: 30 April 2016
ISSN: 1886-7995
Volume: 42
Subjects:
Freetext Keywords: Deslizamiento rotacional, Cordillera Ibérica, facies Utrillas, Cretácico, simulación numérica
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ingeniería y Morfología del Terreno
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

[thumbnail of INVE_MEM_2015_224405.pdf]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (10MB) | Preview

Abstract

The Pico de Navas landslide was a large-magnitude rotational movement, affecting 50x106m3 of hard to soft rocks. The objectives of this study were: (1) to characterize the landslide in terms of geology, geomorphological features and geotechnical parameters; and (2) to obtain an adequate geomechanical model to comprehensively explain its rupture, considering topographic, hydro-geological and geomechanical conditions.

The rupture surface crossed, from top to bottom: (a) more than 200 m of limestone and clay units of the Upper Cretaceous, affected by faults; and (b) the Albian unit of Utrillas facies composed of silty sand with clay (Kaolinite) of the Lower Cretaceous.

This sand played an important role in the basal failure of the slide due to the influence of fine particles (silt and clay), which comprised on average more than 70% of the sand, and the high content presence of kaolinite (>40%) in some beds. Its microstructure consists of accumulations of kaolinite crystals stuck to terrigenous grains, making clayey peds. We hypothesize that the presence of these aggregates was the internal cause of fluidification of this layer once wet. Besides the faulted structure of the massif, was an important factor for the occurred landslide. Other conditioning factors of the movement were: the large load of the upper limestone layers; high water table levels; high water pore pressure; and the loss of strength due to wet conditions.

The numerical simulation of the stability conditions concurs with our hypothesis.

The landslide occurred in the Recent or Middle Holocene, certainly before at least 500 BC and possibly during a wet climate period. Today, it appears to be inactive.

Due to mineralogical features of involved material, facies Utrillas, in the landslide, the study helps to understand the frequent slope instabilities all along the Iberian Range where this facies is present.

More information

Item ID: 41971
DC Identifier: https://oa.upm.es/41971/
OAI Identifier: oai:oa.upm.es:41971
DOI: 10.5209/rev_JIGE.2016.v42.n1.49727
Official URL: https://revistas.ucm.es/index.php/JIGE/article/vie...
Deposited by: Memoria Investigacion
Deposited on: 20 Jul 2016 16:17
Last Modified: 10 Jun 2019 09:54
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM