Kartiko, Rendy Dwi
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ANALISIS RESPON STATIK DAN DINAMIK PADA BAGIAN BENDUNGAN URUGAN DARI BENDUNGAN MELATI Ramadhan, Gumilar; Kartiko, Rendy Dwi; Taufiq, Ahmad; Irawan, Dasapta Erwin
Jurnal Lingkungan dan Bencana Geologi Vol 15, No 3 (2024)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v15i3.502

Abstract

ABSTRAKDalam pembangunan dan operasionalnya, bendungan dapat mengalami kerusakan. Salah satu faktor yang dapat mengakibatkan kerusakan pada bendungan yaitu gempa bumi. Kerusakan tersebut jika tidak diantisipasi dapat mengakibatkan kegagalan dan bencana yang dapat berakibat kerugian materil dan jiwa. Untuk menghindari bencana maka diperlukan perencanaan yang baik sebelum pembangunan. Respon bendungan, baik kondisi statik dan dinamik, perlu diketahui untuk mengevaluasi keamanan dari desain bendungan. Bendungan Melati direncanakan merupakan bendungan komposit dengan jenis bendungan urugan zonasi pada sisi kiri dan bendungan roller-compacted concrete (RCC) pada sisi kanan. Analisis menggunakan metode finite element dilakukan terhadap bagian bendungan urugan. Analisis respon statik secara sequential menggunakan 23 lift didapatkan adanya settlement berbentuk oval pada tengah core dengan settlement terbesar 34 cm dan displacement horizontal sebesar 8 cm menuju sisi downstream di akhir konstruksi. Pada penelitian ini digunakan rekaman akselerasi berdasarkan deaggregrasi analisis seeismic hazard untuk tiga mekanisme gempa berbeda yang kemudian dilakukan spectral acceleration amplification terhadap PGA. Berdasarkan parameter controlling earthquake digunakan gempa Tohoku dengan amplifikasi 0.8 untuk mekanisme megathrust, gempa Iwate dengan amplifikasi 2.5 untuk mekanisme patahan, dan gempa Patea dengan amplifikasi 4.3 untuk mekanisme shallow crustal. Deformasi permanen berdasarkan analisis stress redistribution pada akhir gempa didapatkan deformasi terbesar yaitu 22 cm untuk gempa Tohoku, 29 cm untuk gempa Iwate, dan 19.9 cm untuk gempa Patea. Berdasarkan analisis keamanan lereng bendungan memiliki keamanan yang sangat baik pada kondisi statik dan cukup pada kondisi dinamik. Walau demikian, faktor keamanan di sisi upstream mendekati 1 pada akhir gempa Tohoku dan Iwate dan diasumsikan tidak aman.Kata kunci: analisis numerik, analisis respon statik, analisis respon dinamik, analisis stabilitas, BendunganABSTRACTDuring construction and operation, dams can experience damage. One factor that can cause damage to a dam is an earthquake. If this damage is not anticipated, it can result in failure and disaster which can result in material and life losses. To avoid such disasters, good planning is needed before construction. The response of the dam, both static and dynamic conditions, needs to be known to evaluate the safety of the dam design. The Melati dam is planned to be a composite dam with a zoned fill dam on the left side and a roller-compacted concrete (RCC) dam on the right side. Analysis using the finite element method was carried out on the embankment dam section. Sequential static response analysis using 23 lifts showed that there was an oval-shaped settlement in the middle of the core with the largest settlement of 34 cm and a horizontal displacement of 8 cm towards the downstream side at the end of construction. In this study, acceleration recordings were used based on deaggregation of seismic hazard analysis for three different earthquake mechanisms and then spectral acceleration amplification was carried out based on the obtained PGA. Based on the controlling earthquake parameters, the Tohoku earthquake was used with an amplification of 0.8 for the megathrust mechanism, the Iwate earthquake with an amplification of 2.5 for the fault mechanism, and the Patea earthquake with an amplification of 4.3 for the shallow crustal mechanism. Permanent deformation based on stress redistribution analysis showed that the largest deformation was 22 cm for the Tohoku earthquake, 29 cm for the Iwate earthquake, and 19.9 cm for the Patea earthquake. Based on the safety analysis, the dam slopes have very good safety factors in static condition and sufficient in dynamic conditions. However, factor of safety on the upstream side are close to 1 at the end of Tohoku and Iwate earthquakes which was assumed to be not safe.Keywords: numerical analysis, static response analysis, dynamic response analysis, stability analysis, Dam
Evaluating the Causes of Land Subsidence in Central Jakarta using 1-Dimensional Consolidation Approach Naufal, Muhammad Adi; Sadisun, Imam Achmad; Kartiko, Rendy Dwi; Septiandi, Muhammad Iqbal
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 2 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i2.13643

Abstract

Land subsidence in Central Jakarta, driven by both natural geological processes and human-induced factors, threatens the stability of the region’s infrastructure. Monitoring of land subsidence with InSAR in Central Jakarta shows an average speed of 1-10 cm/year. Land subsidence in Central Jakarta presents a growing geotechnical challenge, exacerbated by both natural consolidation and anthropogenic influences. During the period of 2018 to 2023, Jakarta's booming industrial development became a major factor contributing to the city's ongoing land subsidence problem. This study aims to evaluate the contribution of consolidation and anthropogenic factors to land subsidence in Central Jakarta. The analytical method uses 1-D consolidation theory is applied to calculate land subsidence. Borehole data from nine locations were used to estimate subsidence rates. Results indicate that natural consolidation has significant role in land subsidence, which is predicted to continue until 2368. Anthropogenic factors such as groundwater level decrease and additional building loads accelerate the subsidence process. The rate of soil subsidence for natural consolidation in Central Jakarta ranges from 1.5-9.1 cm/year. Meanwhile, there are anthropogenic factors such as groundwater level decrease and increase of building load achieved 3.4-17.4 cm/year. These anthropogenic factors accelerate the rate of soil subsidence by 1.9-8.3 cm/year or equivalent to 26.0-47.7%. Based on analysis, land subsidence analysis in Central Jakarta shows that increase in building load and groundwater level decrease in five years does not significantly affect the subsidence that occurs. However, role of anthropogenic factors can exacerbate land subsidence in Central Jakarta. Groundwater extraction arrangements and building load management need to be considered to minimize the negative impact on infrastructure.