Investigation of an active landslide area with the Electrical Resistivity Tomography (ERT) and surface-wave analysis methods in Hendek, Sakarya

Yıl 2024, Cilt: 30 Sayı: 5, 686 - 695, 30.10.2024

Hasan Karaaslan , Ali Silahtar

Öz

Landslides, one of the natural disaster problems, occur due to slope
stability triggered by natural or human activities. Once such mass
movements have begun, they are challenging to stop and, in some cases,
almost impossible. Geophysical methods are very effective in
determining the character and mechanical properties of landslides with
a high resolution before or after mass movement. This study aims
identifying the landslide that tends to continue in the Çamlıca
neighborhood of the Hendek district of Sakarya province by electrical
resistivity (ERT), surface waves analysis (MASW-ReMi), and mechanical
soil drilling. The low resistivity and low shear wave velocity (Vs) unit in
the geophysical sections was determined as a saturated clayey thick
cover layer from the borehole log. This clayey unit causes mass
movement on the slip surface. Andesite-basalt-containing bedrock unit
under the slip surface has been identified as having high resistivity and
high velocity in geophysical sections. The integrated use of geophysical
methods in this landslide, determined as the progressive mechanism,
contributed significantly to the realistic modeling of the landslide
internal structure.

Anahtar Kelimeler

Landslide, Geophysics, Electrical Resistivity Tomography (ERT), Surface-wave Analysis (MASW-ReMi), Sakarya-Hendek

Elektrik Rezistivite Tomografi (ERT) ve yüzey dalgası analiz yöntemleriyle aktif bir heyelan alanının incelenmesi, Sakarya, Hendek

Öz

Yıkıcı doğal afetlerden birisi olan heyelanlar, şev stabilitesinin doğa
veya insan kaynaklı aktiviteler ile tetiklenmesi sonucu meydana
gelmektedir. Bu tür kütle hareketlerini başladıktan sonra onları
durdurmak çok zor ve hatta bazı durumlarda neredeyse imkânsızdır.
Bu kütle hareketinin öncesi veya sonrasında, heyelanın karakterinin ve
mekanik özeliklerinin yüksek çözünürlüklü belirlenmesinde jeofizik
yöntemler oldukça etkilidir. Bu çalışmada Sakarya ili Hendek ilçesi
Çamlıca Mahallesi’nde meydana gelen ve devam etme eğiliminde olan
bir heyelanın elektrik özdirenç (ERT), yüzey dalgaları analizi (MASWReMi) ve mekanik zemin sondajı ile tanımlanması amaçlanmıştır. Elde
edilen jeofizik kesitlerdeki düşük özdirençli ve düşük kayma dalgası hızlı
(Vs) birim sondaj logundan suya doygun killi kalın örtü tabası olarak
belirlenmiştir. Kayma yüzeyi üzerinde kütle hareketine sebep olan bu
birimin altındaki andezit-bazalt içerikli anakaya birimi jeofizik
kesitlerde yüksek özdirençli ve yüksek hızlı olarak tespit edilmiştir.
İlerleyici hareket mekanizmasına uygun olarak belirlenen bu heyelanda
jeofizik yöntemlerin tümleşik kullanımı, heyelanın içyapısının gerçeğe
yakın olarak modellenmesine önemli katkı sağlamıştır.

Anahtar Kelimeler

Heyelan, Jeofizik, Elektrik Rezistivite Tomografisi (ERT), Yüzey dalgaları analizi (MASW-ReMi), SakaryaHendek

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