Alternatif Penanganan Kerusakan Abutmen Jembatan Glendeng kabupaten Tuban

Ghazanfar, Alfanditya (2025) Alternatif Penanganan Kerusakan Abutmen Jembatan Glendeng kabupaten Tuban. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kerusakan Jembatan Glendeng pada tanggal 3 November 2020 terjadi longsoran dinding tembok penahan pada jalan pendekat jembatan di wilayah Kabupaten Tuban yang diperkirakan akibat infiltrasi air dan erosi pada tanah di sekitar Dinding Penahan Tanah Jembatan Glendeng. Tahun 2021 pemerintah kemudian melakukan perbaikan pasca kerusakan yang terjadi dengan penggantian jalan pendekat menjadi jembatan pendekat serta penambahan timbunan pada area abutmen jembatan. Namun pilar jembatan masih mengalami pergeseran dan mengakibatkan penurunan pada bangunan atas jembatan (rangka baja). Penelitian ini bertujuan untuk melakukan rekonstruksi pada kerusakan abutmen jembatan pada tahun 2020. Abutmen jembatan dimodelkan sesuai dengan kondisi kemudian dilakukan simulasi diberbagai kondisi. Metode penelitian yang digunakan meliputi pengumpulan data sekunder dan primer serta pemodelan komputasi. Data sekunder yang dikumpulkan meliputi data gambar jembatan, data tanah, data tinggi air sungai pada periode waktu tertentu. Langkah selanjutnya adalah melakukan pemodelan struktur jembatan dengan dibantu menggunakan software Plaxis. Hasil analisa menunjukkan kelongsoran abutmen jembatan pada tahun 2020 diduga disebabkan oleh infiltrasi air banjir ke tanah yang kemudian diikuti oleh penurunan muka air banjir dengan cepat. Analisa stabilitas lereng menggunakan software PLAXIS kerusakan tahun 2020 diperoleh SFmin = 1,184 kondisi setelah banjir tahap operasional beban (LWL) SFmin = “Kegagalan Struktur” penyebabnya adalah proses infiltrasi pada tanah disaat air telah mencapai Low Water Level tanah yang terendam banjir akan mengalami kelongsoran ketika air telah surut akibat sifat tanah yang berubah menjadi Jenuh. Perkuatan 2021 diperoleh SFmin = 1,097 pada reaksi tahap kontruksi jembatan dan timbunan karena beban yang ditimbulkan pada timbunan tidak mampu di tahan oleh Dinding Penahan yang pondasinya tertanam pada area tanah lunak. Untuk mengatasi longsor pada perkuatan tahun 2021, digunakan Contiguous Pile Wall dengan konfigurasi bored pile diameter 1 m, panjang tiang 30 m, mutu beton (f’c) 30 MPa, mutu baja (fy) 400 MPa, di mana terdapat satu baris pile cap yang akan menahan dinding penahan pada bidang longsor, dan pile cap terdiri atas barisan bored pile yang tertanam sebagai Contiguous Pile Wall. Hasil analisa oleh software Plaxis menunjukkan nilai SF meningkat sebesar 1,551 dengan total dicplacement yaitu 0,069 dapat dikategorikan struktur “Aman” Sesuai dengan SNI – 8460 tahun 2017 tentang Perencanaan Geoteknik.
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The damage to the Glendeng Bridge on November 3, 2020, was caused by a landslide of the retaining wall on the bridge approach road in Tuban Regency, which was estimated to be the result of erosion on the soil around the retaining wall of the Glendeng Bridge approach road. In 2021, the government carried out repairs after the damage by replacing the approach road with an approach bridge, using fill around the bridge abutment area. However, the bridge's pillars still experienced shifting, causing a settlement in the superstructure of the bridge (steel frame). This study aims to reconstruct the damage to the bridge abutment that occurred in 2020. The bridge abutment was modeled based on its actual conditions, followed by simulations under various scenarios. The research methods included collecting secondary and primary data, as well as computational modeling. Secondary data collected consisted of bridge design drawings, soil data, and river water level data for specific time periods. The next step was to model the bridge structure using Plaxis software. Based on the results obtained from the slope stability analysis using PLAXIS software, the 2020 damage showed a minimum safety factor (SFmin) of 1.184 under pre-flood conditions. After the flood, during the operational stage at Low Water Level (LWL), the SFmin indicated "Structural Failure." The cause of this failure is the infiltration process in the soil when the water reached the Low Water Level. The soil, which had been flooded, experienced slippage once the water receded due to the soil's properties changing to a saturated state. The analysis results indicate that the collapse of the bridge abutment in 2020 was likely caused by floodwater infiltration into the soil, followed by a rapid decrease in floodwater levels. Slope stability analysis using PLAXIS software for the 2020 damage yielded a minimum safety factor (SFmin) of 1.184. After the flood subsided during the operational load stage (LWL), the SFmin indicated "Structural Failure." The failure was attributed to the infiltration process in the soil when the water reached the Low Water Level; flood-saturated soil became unstable as the water receded due to its transition to a saturated state. The 2021 reinforcement resulted in an SFmin of 1.097 during the bridge construction and embankment stages. The embankment load exceeded the capacity of the retaining wall, whose foundation was embedded in soft soil, leading to instability. To address the landslide in the 2021 reinforcement, a Contiguous Pile Wall was utilized, featuring a configuration of bored piles with a diameter of 1 m, a pile length of 30 m, concrete strength (f’c) of 30 MPa, and steel strength (fy) of 400 MPa. A single row of pile caps was included to support the retaining wall along the slip plane, consisting of a row of bored piles embedded as a Contiguous Pile Wall.The analysis results using Plaxis software showed that the safety factor (SF) increased to 1.551, with a total displacement of 0.069 m, which can be categorized as "Safe" according to the Indonesian National Standard (SNI) – 8460 of 2017 on Geotechnical Design.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Kestabilan Lereng, Kerusakan Abutmen, Abutmen Jembatan Slope Stability, Abutment Damage, Bridge Abutment
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization
Divisions:	Faculty of Vocational > Civil Engineering Maintenance and Restoration of Buildings (S2)
Depositing User:	Alfanditya Ghazanfar
Date Deposited:	30 Jan 2025 14:57
Last Modified:	30 Jan 2025 14:57
URI:	http://repository.its.ac.id/id/eprint/117169

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