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Comparison of Geotechnical and Geophysical Prospecting Approaches in the Study of a Landslide in Northern IranNormal access

Authors: M. Kazemnia Kakhki, H. Rezaiy and A. Sadidkhouy
Event name: Near Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics
Session: Active Geophysics for Landslide Monitoring
Publication date: 06 September 2015
DOI: 10.3997/2214-4609.201413719
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.08Mb )
Price: € 20

Summary:
One of the most challenges in landslides is deciphering of slide surface. As we know, there are different landslide types which make us the first problem to create accurate observations to distinguish the type and the stage of landslide. The following step is to define where to focus our monitoring. Electrical resistivity measurement is one of the most common methods which can be applied in landslide studies, although it is not accurate in most cases. On the other hand, its lower expense makes it applicable. For this, 2D electrical resistivity observations and Geotechnical methods such as standard penetration tests were combined to distinguish the subsurface conditions on a big landslide surface in NargesChal, a village in north of Iran in Golestan province. The results were controlled by geotechnical logs and the extracted slide surfaces were confirmed by direct subsurface information. The depth of 11.5 to 12.5m in all profiles has confirmed as sliding surface in SPT and soil moisture variation diagrams which is somehow consistent to Geoelectric method.


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