Investigating and comparing the efficiency of geotechnical and geoelectrical methods in the study of landslides (Case study: Afsarabad landslide in Chaharmahal and Bakhtiari province-southwest of Iran)

Authors

Agricultural and Natural Resources Research and Education Center, Chaharmahal and Bakhtiari, Agricultural Research and Education Organization, Shahrekord, Iran.

Abstract

Mass movements are complex phenomena. Recognizing the surface of rupture in landslides, is one of the most important prerequisites for studying the causes of instabilities and making the right decision for stabilization, which unfortunately faces a lot of uncertainty. The main object is to optimize the field study methods by combining stratigraphic studies, geotechnical and geoelectrical field surveys with the aim of determining the depth of the landslide surface with the lowest cost. This research was carried out in the Afsarabad village landslide in the west of Chaharmahal and Bakhtiari province and includes data collection and analysis of geological and stratigraphic features drilling and soil mechanics tests as well as geoelectrical surveys and the depth of rupture surface, has been extracted using geoelectric surveys with a dipole-dipole array and then compared with software geotechnical analysis. The satety factor for the Afsarabad landslide was calculated using the finite element method (Plaxis software) at different levels of underground water. Based on the obtained results, the slope is unstable, so that the safety coefficient in the dry and wet season is (0.77) and (0.6), respectively, and the depth of the rupture surface is 28 meters. Geoelectric surveys have shown an average depth of 25 meters for the rupture surface, which is in agreement with the software analysis. Therefore, the geoelectric method with dipole-dipole array can replace a significant part of conventional drilling at a low cost.

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References

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Advanced Applied Geology
Volume 14, Issue 4
January 2025
Pages 1099-1123

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