Journal of Geography  & Natural Disasters
Open Access

Abstract

Natural and Numerical Landslide Model Based on Measurement and Predicted Values Comparison: A Case Study of Kavaskbendi Dam Left Bank Andirap Landslide

Murat Eröz, Resul Pamuk*, Kemal Tuncer and Havvanur Kılıç

Background: The Andirap landslide is located on the left bank of the Kavsakbendi dam body, which was completed and put into operation in 2013, approximately 50 km from the Kozan district of Adana Province Turkey. The landslide was initially identified in the 1960s. During excavations for the construction of the dam, which began in 2009, it was determined by measuring instruments that the landslide moved between the limestone bedrock and shale to a depth of about 72 m from the surface. The extensive site and laboratory investigations were conducted to investigate the sliding mechanism of the landslide. Monitoring and stability analyses were performed to monitor the landslide's effects on the dam structure. For this purpose, the shear mass has been periodically monitored since 2013 with geodetic (superficial) and inclinometric (deep) measurements. According to the measurement results, a total displacement of 0.10 m occurred between 2013 and 2017, and between 2017 and 2020, the movement rate slowed down and decelerated to a standstill. In this study, after creating a numerical model and verification of the sliding of Andirap, which was activated in 2009, the possible behavior of the sliding under different load conditions of the dam was examined through stress-strain and stability analyses. According to the results of the analysis, no global failure was observed for the slip circle of the And?rap landslide. In the analyses carried out for the conditions in which the reservoir is full, the deep displacement of 0.11 m was consistent with deformation values of 0.04 and 0.11 m measured with inclinometers. In the analyses carried out for the load condition with full reservoir and seismic effects, it was calculated that the surface displacements reach up to 1.0 m compared to the depth displacements of around 0.13 m.

Results: As a result of this study, the creation of an actual numerical model of the site relies on the comparison of site measurements with extensive soil laboratory tests. Therefore, validated and compared numerical models of landslides can be used to predict landslide failure mechanisms over a service life.

Published Date: 2022-09-06; Received Date: 2022-08-05