ESTD PERPUSTAKAAN UNTAD
ESTD PERPUSTAKAAN UNTAD
| JudulPOTENSI LIKUEFAKSI DI DESA UMPANGA DUSUN 2 KECAMATAN BUNGKU BARAT KABUPATEN MOROWALI BERDASARKAN DATA HASIL SWEDISH WEIGHT SOUNDING |
| Nama: ALIFYA NURUL QHALBI |
| Tahun: 2025 |
| Abstrak POTENSI LIKUEFAKSI DI DESA UMPANGA DUSUN 2 KECAMATAN BUNGKU BARAT KABUPATEN MOROWALI BERDASARKAN DATA UJI SWEDISH WEIGHT SOUNDING Alifya Nurul Qhalbi, Hendra Setiawan, Ida Sri Oktaviana ABSTRAK Desa Umpanga memiliki kondisi geologi dan geomorfologi yang berpotensi mengalami likuefaksi. Wilayah ini berada pada zona seismik aktif dengan jenis tanah didominasi pasir lepas serta muka air tanah dangkal, sehingga rentan terhadap likuefaksi saat gempa. Penelitian ini bertujuan mengetahui karakteristik tanah dan potensi likuefaksi di Desa Umpanga melalui uji Swedish Weight Sounding dan pengujian laboratorium berupa analisis ukuran butiran, batas-batas Atterberg, serta berat isi tanah. Tahapan penelitian meliputi pengambilan data lapangan menggunakan alat Swedish Weight Sounding yang menghasilkan nilai Nsw, N, qa, dan qu. Selanjutnya dilakukan uji laboratorium berupa analisis saringan dan batas Atterberg untuk memperoleh gradasi butiran serta nilai LL, PL, dan IP. Berdasarkan hasil pengujian, nilai FS berada pada rentang 0,16–1,41. Karakteristik tanah yang diperoleh melalui uji SWS pada sepuluh titik menghasilkan tiga parameter utama, yaitu nilai Nsw berkisar 0,00–384,62 n/m, nilai qa berkisar 0,00–337,69 kN/m², dan nilai qu berkisar 2,25–333,46 kN/m². Kedalaman muka air tanah pada seluruh titik pengujian adalah 1,00 meter. Potensi likuefaksi berdasarkan distribusi ukuran butiran menggunakan kurva Tsuchida menunjukkan sebagian grafik masuk dalam batas kurva merah yang berarti sangat berpotensi likuefaksi, sedangkan sebagian lainnya berada pada kurva hitam yang berarti berpotensi likuefaksi. Dengan metode Modified Chinese, seluruh titik pengujian berpotensi likuefaksi. Hasil Swedish Weight Sounding menunjukkan secara umum nilai FS < 1, sehingga dapat disimpulkan bahwa P1-P10 berpotensi likuefaksi pada kedalaman kurang dari 10 meter, dengan batas percepatan gempa (amax) 0,34 g dan magnitude gempa 7,4 Mw. Kata kunci: Likuefaksi, Swedish Weight Sounding, Tsuchida, Umpanga, Morowali POTENTIAL LIQUEFACTION IN UMPANGA VILLAGE HAMLET 2 BUNGKU BARAT DISTRICT MOROWALI REGENCY BASED ON SWEDISH WEIGHT SOUNDING TEST DATA Alifya Nurul Qhalbi, Hendra Setiawan, Ida Sri Oktaviana ABSTRACK Umpanga Village has geological and geomorphological conditions that have the potential to experience liquefaction. This area is located in an active seismic zone with soil types dominated by loose sand and shallow groundwater levels, so it is susceptible to liquefaction during earthquakes. This study aims to determine the characteristics of the soil and the potential for liquefaction in Umpanga Village through the Swedish Weight Sounding test and laboratory testing in the form of grain size analysis, Atterberg boundaries, and soil content weight. The research stage included taking field data using the Swedish Weight Sounding tool which produced Nsw, N, qa, and qu values. Furthermore, laboratory tests were carried out in the form of filter analysis and Atterberg limits to obtain grain gradations and LL, PL, and IP values. Based on the test results, the FS value was in the range of 0.16–1.41. The soil characteristics obtained through SWS tests at ten points resulted in three main parameters, namely Nsw values ranging from 0.00–384.62 n/m, qa values ranging from 0.00–337.69 kN/m², and qu values ranging from 2.25–333.46 kN/m². The groundwater level at all test points is 1.00 meters. The liquefaction potential based on the grain size distribution using the Tsuchida curve shows that some of the graphs are within the red curve boundary, which means there is a lot of potential for liquefaction, while others are on the black curve which means there is a potential for liquefaction. With the Modified Chinese method, all test points have the potential for liquefaction. The results of Swedish Weight Sounding show in general the FS value < 1, so it can be concluded that P1-P10 has the potential to liquefaction at a depth of less than 10 meters, with an earthquake acceleration limit (amax) of 0.34 g and an earthquake magnitude of 7.4 Mw. Keywords: Liquefaction, SwedishWeight Sounding, Tsuchida, Umpanga, Morowali |