BAB 5 KESIMPULAN DAN SARAN
5.1 Kesimpulan
Kesimpulan yang diperoleh dari penelitian ini adalah:
1. Peak base acceleration berdasarkan data gempa rentang tahun 1980-2018 adalah:
a. Menggunakan fungsi Atenuasi Joyner dan Boore adalah 0,143 g b. Menggunakan fungsi Atenuasi Crouse adalah 0,101 g
2. Peak ground acceleration maksimum pada BH-I dengan karakteristik gempa Elcentro:
a. Pada kasus I adalah 0,190 g b. Pada kasus II adalah 0,140 g
3. Peak ground acceleration maksimum pada S-I dengan karakteristik gempa Elcentro:
a. Pada kasus I adalah 0,250 g b. Pada kasus I adalah 0,175 g
4. Lapisan tanah yang berpotensi likuifaksi pada BH-I dengan metode Idriss dan Boulanger (2014) sebagai berikut:
a. Pada kasus I, 4 lapisan dari 15 lapisan memiliki potensi terlikuifaksi, detail kedalaman adalah sebagai berikut:
i. Kedalaman 3,45 m ii. Kedalaman 8,45 m iii. Kedalaman 10,45 m iv. Kedalaman 20,45 m
b. Pada kasus I, 2 lapisan dari 15 lapisan memiliki potensi terlikuifaksi, detail kedalaman adalah sebagai berikut:
i. Kedalaman 3,45 m ii. Kedalaman 8,45 m
5. Lapisan tanah yang berpotensi likuifaksi pada S-I dengan metode Robertson dan Wride (1998) sebagai berikut:
a. Pada kasus I dan kasus II, 16 lapisan dari 33 lapisan memiliki potensi terlikuifaksi, detail kedalaman adalah sebagai berikut:
i. Kedalaman 1 m
Saran yang dapat diberikan untuk penelitian selanjutnya adalah:
1. Perlu dilakukan penelitian lanjutan mengenai potensi likuifaksi terhadap lokasi proyek dengan metode lain yang mempertimbangkan pengaruh beban underpass yang didirikan.
2. Selain dengan menggunakan data insitu SPT ataupun CPT untuk menganalisis potensi likuifaksi pada underpass ini sebaiknya digunakan juga metode gradasi butiran yang mempertimbangkan ukuran dan kerapatan butiran dalam analisisnya.
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