Karakteristik Tanah Longsor pada Ruas Jalan Tawaeli-Toboli KM 26+57
DOI:
https://doi.org/10.52722/a1cvz616Keywords:
Landslide, Poorly Graded Sand with Silt, Resistivity, , Slip Surface, GroundwaterAbstract
Frequent landslide disasters along the Kebun Kopi road in Central Sulawesi have significantly
disrupted public mobility and goods distribution, with 12 recorded incidents throughout 2024. This
condition is triggered by slope instability prone to deformation, particularly along the Tawaeli
Toboli road section, where previous research indicated slope movement could exceed 0.5 meters
under saturated conditions and heavy traffic loads. Addressing this issue, this study was conducted
to analyze soil characteristics at the Tawaeli-Toboli Road KM 26+57 segment through laboratory
testing of 8 samples and geophysical investigation. Laboratory test results identified the majority of
materials as Poorly Graded Sand with Silt (SP-SM) with low density (dry unit weight 0.33-1.60
g/cm³) and minimal cohesion (0.074-0.141 kg/cm²), while geoelectrical survey revealed a subsurface
profile dominated by sand-silt mixture with resistivity values of 42.9-288 Ωm indicating
groundwater presence. The combination of fine-grained material properties, loose density, low
cohesion, and saturated conditions creates a critical slope failure mechanism, where saturated silt
layers act as potential slip surfaces, thus requiring specific mitigation measures to prevent
landslides at the study location.
Downloads
References
[1] BMKG. (2024). Balai Besar Meteorologi, Klimatologi, dan Geofisika Wilayah IV.
[2] BPBD. (2024). Profil Badan Penanggulangan Bencana Daerah Provinsi Sulawesi Tengah. Diambil 17 Oktober,
dari https://pusdalops-bpbdsulteng.com/data-bencana-publik
[3] Butarbutar, R., Ulian, F. K., & Kasmira. (2021). Geological Structure Identification of Rock Distribution with
Resistivity Geolistric Methods in Landslide. Review of International Geographical Education Online, 11(5), 393
401. https://doi.org/10.48047/rigeo.11.05.40
[4] Craig, R. F. (1989). Mekanika Tanah, Edisi Keempat. Erlangga, Jakarta.
[5] Hamdhan, I. N., & Pratiwi, D. S. (2017). Analisis Stabilitas Lereng dalam Penanganan Longsoran di Jalan Tol
Cipularang Km. 91+200 dan Km. 92+600 Menggunakan Metode Elemen Hingga (FEM). I(2).
[6] Hardiyatmo, H. C. (2019). Mekanika Tanah 2. Yogyakarta: Gadjah Mada Univesity Press ; Anggota IKAPI.
[7] Hoek, E. (1991). When is a design in rock engineering acceptable? 7th ISRM Congress.
https://doi.org/10.1016/0148-9062(94)92605-0[8] Mawardi, & Hellyward. (2023). Studi Pengaruh Sudut Kemiringan Lereng dan Jumlah Tranp Terhadap Bahaya
Longsor.. Inersia Jurnal, 15(2), 129–136. https://doi.org/10.33369/ijts.15.2.129-136
[9] Muhardi, Perdhana, R., & Nasharuddin. (2019). Identifikasi Keberadaan Air Tanah Menggunakan Metode
Geolistrik Resistivitas Konfigurasi Schlumberger (Studi Kasus: Desa Clapar Kabupaten Banjarnegara). PRISMA
FISIKA, 7(3), 331–336.
[10] Pontoh, A. N. (2017). Analisis Stabilitas Lereng Pada Ruas Jalan Tawaeli-Toboli KM 25-35, Sulawesi
Tengah Terhadap Pengaruh Curah Hujan Dengan Simulasi Numerik. Universitas Gajah Mada.
[11] PUPR. (2021). Modul Pengertian Lereng Dan Longsoran. Kementrian Pekerjaan Umum Dan Perumahan Rakyat
Direktorat Jenderal Sumber Pusat Pendidikan Dan Pelatihan Jalan, Perumahan, Permukiman, Dan
Pengembangan Infrastruktur Wilayah, 6–9.
[12] Rahmawati, S., Burhan, R., & Amin, M. (2022). Kajian Longsor Lereng Kebun Kopi KM 41+881 dan KM 42+163
dengan Menggunakan Metode Elemen Hingga in Konferensi Nasional Teknik Sipil
[13] Ramadhani, S., Martini, & Oktaviana, D. A. (2024). The Effect of Rain Intensity and Soil Saturation Levels on
Slope Stability in Kebun Kopi Area KM 49+635. IOP Conference Series: Earth and Environmental Science,
1355(1), 12026. https://doi.org/10.1088/1755-1315/1355/1/012026
[14] Telford, W. M., Geldart, L. P., & Sheriff, R. E. (1990). Applied Geophysics (2 ed.). Cambridge University Press.
https://doi.org/DOI: 10.1017/CBO9781139167932
[15] Yulikasari, A. (2017). Analisis Faktor Keamanan Lereng Tanah Menggunakan Metode Resistivitas 2d Dan Limit
Equilibrium Method Di Daerah Olak Alen, Selorejo, Blitar. 83. http://repository.its.ac.id/45485
Journal Template
