Triggering mechanism of long-distance flow-type landslides caused by 2018 Sulawesi Earthquake, Indonesia

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2025-02-01 DOI:10.1016/j.sandf.2024.101544

Takashi Kiyota , Masataka Shiga , Koji Mori , Toshihiko Katagiri , Hisashi Furuichi , Hendra Setiawan

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引用次数: 0

Abstract

On 28 September 2018, the Mw 7.5 Sulawesi earthquake occurred in Indonesia, triggering long-distance flow-type landslides on very gentle slopes in and around Palu City. In order to investigate the triggering mechanism of these landslides, this study firstly compiled the field investigations that have been conducted since immediately after the earthquake and a soil profile of the landslide areas. Secondly, a groundwater flow analysis was carried out for the landslide in Petobo on the basis of the estimated soil cross-section. The results showed that, prior to the 2018 earthquake, there was confined groundwater with a water pressure of 40–60 kPa above what would be expected from the hydrostatic conditions in the flow zone of the landslide area. Finally, a simplified liquefaction analysis was performed using the groundwater pressure obtained by the groundwater flow analysis. The results indicated that, although the flow zone in the landslide area consisted of subsoils, including a relatively dense silty sand layer, it is likely that the significant liquefaction that occurred during the 2018 earthquake was due to the presence of confined groundwater. Furthermore, the authors concluded that the liquefaction probably contributed to the prolonged upward flow of large quantities of confined groundwater from aquifers located more than 20 m in depth below the ground surface, which resulted in a long-distance flow-type landslide by muddying the surface layer. It was also shown that the presence of an irrigation channel just above the landslide areas on the eastern side of Palu Valley had little effect on the sequence of landslide mechanism.

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来源期刊

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.