Analisis Pengaruh Pelebaran Jalan Terhadap Stabilitas Badan Jalan Eksisting (Studi Kasus Ruas Jalan Nasional Pejagan – Prupuk)

Kesuma, Andhika (2023) Analisis Pengaruh Pelebaran Jalan Terhadap Stabilitas Badan Jalan Eksisting (Studi Kasus Ruas Jalan Nasional Pejagan – Prupuk). Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Ruas jalan Pejagan – Prupuk terus mengalami peningkatan minat pengendara terutama kendaraan barang. Peningkatan kapasitas jalan berupa pelebaran perlu direncanakan untuk mengantisipasi peningkatan volume kendaraan yang terus terjadi. Pelebaran ruas jalan Pejagan – Prupuk perlu dilakukan dengan berhati-hati. Ruas jalan ini berada di atas tanah dasar yang lunak. Hasil uji CPT di lapangan menunjukkan tanah memiliki nilai qc 0-20 kg/cm2 hingga kedalaman 17,2 meter. Pada tanah dasar juga terdeteksi adanya mineral montmorillonite yang berifat ekspansif. Namun berdasarkan uji laboratorium, swelling pressure sebesar 0,154 kg/cm2 termasuk kategori rendah. Pelebaran jalan dilakukan pada elevasi 4 meter dari tanah dasar sehingga akan terbentuk lereng badan jalan yang cukup tinggi. Timbunan pelebaran jalan yang tinggi di atas tanah lunak menghasilkan perbedaan penurunan antara jalan eksisting dengan jalan baru serta mengakibatkan lereng timbunan jalan tidak stabil. Penanganan yang dilakukan pada tanah dasar di bawah timbunan jalan baru adalah menggunakan PVD agar tanah dasar semakin cepat mencapai derajat konsolidasi 90%. Sehingga tidak terjadi penurunan yang besar setelah konstruksi jalan selesai dilaksanakan. Lereng timbunan yang tidak stabil ditangani dengan beberapa alternatif perkuatan menggunakan program bantu menggunakan metode LEM. Berdasarkan analisa perhitungan, terjadi penurunan sebesar 9,151 cm di bawah jalan eksisting dan 11,336 cm di bawah jalan baru pada tahun pertama. Penurunan dapat ditangani dengan menggunakan PVD sehingga penurunan dapat dicapai dalam waktu 23 minggu. Selanjutnya pemodelan lereng pelebaran jalan tanpa perkuatan memiliki nilai Fs sebesar 0,84 yang berarti jalan dalam kondisi tidak stabil. Berdasarkan perbandingan menggunakan metode AHP, perkuatan cerucuk, geotekstil dan beronjong ditentukan sebagai alternatif perkuatan yang mampu meningkatkan FS > 1,5 dengan efisien.
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The Pejagan – Prupuk road section continues to experience an increase in the interest of motorists, especially goods vehicles. In order to anticipate escalation of the traffic volume, road widening need too be planned to increase road capacity. The widening of the Pejagan – Prupuk road section needs to be done carefully. This road section is on soft subgrade soil. CPT test results in the field showed that the soil had a qc value of 0-20 kg/cm2 to a depth of 17.2 meters. In the subgrade soil also detected the mineral montmorillonite which is expansive. However, based on laboratory tests, the swelling pressure of 0.154 kg/cm2 is in the low category. Road widening is carried out at an elevation of 4 meters from the subgrade so that a fairly high slope of the road body will be formed. Road embankment widening high above soft ground results in a difference in settlement between the existing road and the new road and causes the slope of the road embankment to be unstable. The handling carried out on the subgrade under the new road embankment is using PVD so that the subgrade reaches a degree of consolidation of 90% more quickly. So that there is no large decline after road construction is completed. Unstable embankment slopes are treated with several reinforcement alternatives using an auxiliary program using the LEM method. Based on the calculation analysis, there was a decrease of 9.151 cm below the existing road and 11.336 cm under the new road in the first year. Sagging can be managed using a PVD so that reduction can be achieved within 23 weeks. Furthermore, the slope modeling of road widening without reinforcement has an Fs value of 0.84 which means the road is in an unstable condition. Based on a comparison using the AHP method, minipile, geotextile and gabion reinforcement was determined as an alternative reinforcement that was able to efficiently increase Fs > 1.5.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	tanah lunak, pelebaran jalan, perkuatan badan jalan, PVD, Perkuatan Cerucuk, expansive soil, soft soil, road widening, embankment reinforcement
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction)
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Andhika Kesuma
Date Deposited:	08 Feb 2023 08:56
Last Modified:	08 Feb 2023 08:56
URI:	http://repository.its.ac.id/id/eprint/96154

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