Analisis Data Mikrotremor Menggunakan Metode Random Decrement untuk Mikrozonasi Daerah Rel Kereta Api JPL 5 PT KAI DAOP 8 Surabaya

Rahmadhani, Cahaya Lintang (2024) Analisis Data Mikrotremor Menggunakan Metode Random Decrement untuk Mikrozonasi Daerah Rel Kereta Api JPL 5 PT KAI DAOP 8 Surabaya. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Mikrotremor merupakan getaran tanah yang terjadi secara alami dengan amplitudo yang sangat kecil. Penelitian ini bertujuan untuk melakukan analisis pengukuran mikrotremor menggunakan metode Random Decrement untuk melakukan mikrozonasi struktur tanah di daerah rel kereta api Jalur Perlintasan Langsung (JPL) 5 PT KAI DAOP 8 Surabaya. Metode Random Decrement digunakan untuk menganalisis data mikrotremor dan menentukan karakteristik tanah seperti frekuensi natural dan rasio redaman. Hasil nilai frekuensi natural dan rasio redaman analisis dengan arah North-South dan East-West dengan variasi sebelum adanya kereta dan setelah adanya kereta. Nilai frekuensi natural sebelum ada kereta berkisar 3,18 Hz – 3,95 Hz pada arah North-South dan 3,21 Hz – 3,73 Hz pada arah East-West, sedangkan setelah ada kereta berkisar 3 Hz – 3, 63 Hz pada arah North-South dan 3,2 Hz – 3,83 Hz pada arah East-West. Nilai frekuensi natural dipengaruhi oleh nilai kecepatan gelombang geser. Nilai rasio redaman sebelum ada kereta berkisar 19,44%-26,66% pada arah North-South dan 19,03%-25,33% pada arah East-West, sedangkan setelah ada kereta berkisar 14,39%-26,73% ada arah North-South dan 21,87%-25,45% pada arah East-West. Rasio redaman dipengaruhi oleh sifat tanah yang bersifat anisotropi. Nilai frekuensi natural dan rasio redaman merupakan nilai tetap sehingga data sebelum dan sesudah ada kereta. Data setelah adanya kereta merupakan data dengan noise. Jenis tanah diklasifikasikan terdiri dari batuan alluvial dengan tipe III berdasarkan klasifikasi Kanai. Hasil tersebut sesuai dengan kondisi geologi Surabaya pada daerah tersebut yang merupakan daerah dengan batuan alluvial.
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Microtremor is a naturally occurring ground vibration with a very small amplitude. This research aims to analyze microtremor measurements using the Random Decrement method to microzone the soil structure in the railroad area of PT KAI DAOP 8 Surabaya Direct Crossing Line (JPL) 5. The Random Decrement method is used to analyze microtremor data and determine soil characteristics such as natural frequency and damping ratio. The results of natural frequency values and damping ratios were analyzed in the North-South and East-West directions with variations before the train and after the train. The natural frequency values before the train ranged from 3.18 Hz - 3.95 Hz in the North-South direction and 3.21 Hz - 3.73 Hz in the East-West direction, while after the train ranged from 3 Hz - 3, 63 Hz in the NorthSouth direction and 3.2 Hz - 3.83 Hz in the East-West direction. The natural frequency value is influenced by the shear wave velocity value. The damping ratio before the train ranged from 19.44%-26.66% in the North-South direction and 19.03%-25.33% in the East-West direction, while after the train ranged from 14.39%-26.73% in the North-South direction and 21.87%- 25.45% in the East-West direction. The damping ratio is influenced by the anisotropic nature of the soil. The natural frequency value and damping ratio are fixed values so that the data before and after the train. Data after the train is data with noise. The soil type is classified as consisting of alluvial rock with type III based on Kanai classification. These results are in accordance with the geological conditions of Surabaya in the area which is an area with alluvial rocks.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Mikrotremor, Mikrozonasi, Frekuensi Natural, Rasio Redaman, Random Decrement Method, Microtremor, Microzonation, Natural Frequency, Damping Ratio.
Subjects:	Q Science > QE Geology > QE539 Microseisms. Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Cahaya Lintang Rahmadhani
Date Deposited:	13 Aug 2024 08:27
Last Modified:	13 Aug 2024 08:27
URI:	http://repository.its.ac.id/id/eprint/115164

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