Effect of soil characteristics and rainfall intensity on slope stability using the finite element method on the Tawaeli-Toboli road section KM 38+881
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Full Text |
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Author |
Sriyati Ramadhani, Hendra Setiawan, Martini and Sri Nur H.
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e-ISSN |
1819-6608 |
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On Pages
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290-299
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Volume No. |
20
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Issue No. |
6
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Issue Date |
May 15, 2025
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DOI |
https://doi.org/10.59018/032542
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Keywords |
slope stability, geoelectric, rain intensity, safety factor (SF), Plaxis.
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Abstract
Landslides can occur due to the disruption of slope balance due to nature and human activities which can happen unexpectedly and can cause losses, so slope stability analysis is needed. On July 31, 2023, a landslide occurred on the Tawaeli-Toboli road section, this event was caused by the influence of high rainfall intensity, which affected the stability of the slope. The aim of this research is to determine the structure of soil layers and soil characteristics that influence the stability of slope intensity due to rain on the Tawaeli-Toboli KM 38+881 road section, calculating the range of slope safety factors (SF) using the finite element method with the Plaxis program. Research methods include field surveys to collect soil data in the form of undisturbed and disturbed soil samples, which are used in testing the physical and mechanical properties of the soil, and then geoelectric tests to determine the structure of the soil layers. The structure of the soil layers on the slopes includes sandy soil, schist, alluvium, and sand. Furthermore, the soil characteristics from laboratory test results include poor grading according to the USCS classification. Based on the results of the slope stability analysis using Plaxis, it was found that the safety factor (SF) for a slope with a slope of 62° did not affect rainfall of 1.12. Then, the slope safety factor after influencing the rain is 1.08-0.99 with an intensity of 25.161 mm/hour, for a rain intensity of 34.419 mm/hour, the slope FS is 1.07-0.99, and for a rain intensity of 43.659 mm/hour, the FS is obtained. slope of 1.02-0.97. From the results of slope modeling in Plaxis, it was found that the rain that has the potential to cause landslides tends to be the type of rain with high intensity, namely, rain with an intensity of 43,659 mm/hour.
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