Analisis Perencanaan Eksisting Dan Alternatif Perbaikan Tanah Lunak Pada Timbunan Jalan Tol Gempol - Pasuruan Sta 28+000 S.d. Sta 33+852

Mahadanta, I Made Deva Satria (2026) Analisis Perencanaan Eksisting Dan Alternatif Perbaikan Tanah Lunak Pada Timbunan Jalan Tol Gempol - Pasuruan Sta 28+000 S.d. Sta 33+852. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangunan Jalan Tol Gempol - Pasuruan pada ruas STA 28+000 s.d. STA 33+852 berada di atas lapisan tanah lunak dengan kedalaman mencapai 16 meter, sehingga berpotensi menimbulkan penurunan besar dan menurunkan stabilitas timbunan. Hasil bor log pada beberapa titik menunjukkan tanah dominan berupa lanau kelempungan berdaya dukung rendah, yang berdampak pada risiko settlement berlebih, serta potensi kelongsoran timbunan akibat elevasi timbunan yang mencapai 9,2 meter. Kondisi awal menunjukkan nilai faktor keamanan lereng sebesar 0,52, yang berarti kurang dari syarat minimum 1,5; oleh sebab itu diperlukan perbaikan dan perencanaan perkuatan timbunan tanah yang memadai. Penelitian ini diawali dengan melakukan analisis terhadap penurunan konsolidasi, penurunan sekunder, rate of settlement, dan stabilitas lereng. Apabila, ternyata hasil evaluasi menunjukan pemampatan yang cukup besar dan stabilitas timbunan yang kurang dari 1,5; maka akan di rencanakan perbaikan sesuai dengan keperluan. Selain itu, akan direncanakan alternatif perencanaan berupa perbaikan tanah dengan metode preloading di kombinasi dengan pemasangan Prefabricated Vertical Drain (PVD) untuk mempercepat konsolidasi tanah. Sedangkan, untuk peningkatan stabilitas digunakan geotextile dan micropile. Hasil analisis kondisi eksisting pada timbunan setinggi 9,2 meter menunjukkan bahwa rate of settlement pada tahun ke-10 sebesar 53,4 cm/tahun. Berdasarkan hasil tersebut diperlukan lapis ulang (overlay) setebal 12 cm yang direncanakan dilaksanakan pada tahun ke-10 sejak jalan mulai dibangun pada tahun 2017. Selain itu, diperlukan perkuatan menggunakan micropile berdiameter 60 cm satu sisi sebanyak 7 buah untuk memenuhi persyaratan stabilitas. Hasil evaluasi terhadap box culvert menunjukkan bahwa struktur telah memenuhi persyaratan faktor keamanan minimum sehingga tidak memerlukan perkuatan tambahan. Pada alternatif perencanaan, kombinasi preloading dan Prefabricated Vertical Drain (PVD) dengan jarak 0,7 meter mampu mempercepat proses konsolidasi tanah hingga mencapai target derajat konsolidasi dalam waktu minggu ke-21. Sebagai perkuatan dasar timbunan digunakan Polypropylene Woven Geotextile UW-20 satu sisi sebanyak 49 lapis dengan kuat tarik rencana 100 kN/m. Alternatif perkuatan menggunakan micropile berdiameter 60 cm satu sisi sebanyak 5 buah juga menghasilkan kondisi timbunan yang memenuhi persyaratan stabilitas.
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The construction of the Gempol–Pasuruan Toll Road at STA 28+000 to STA 33+852 is located on a soft soil layer with a depth of approximately 16 meters, which has the potential to cause significant settlement and reduce embankment stability. Borelog results at several points indicate that the subsoil is predominantly clayey silt with low bearing capacity, resulting in risks of excessive settlement, and potential embankment slope failure due to embankment heights reaching 9.2 meters. The initial condition showed a slope safety factor of 0.52, which is lower than the minimum requirement of 1.5; therefore, adequate soil improvement and embankment reinforcement design are required. This study began by analyzing consolidation settlement, secondary settlement, rate of settlement, and slope stability. If the evaluation results indicated significant settlement and an embankment stability value lower than 1.5, soil improvement and reinforcement were designed according to the required conditions. In addition, an alternative design was proposed using the preloading method combined with the installation of Prefabricated Vertical Drains (PVD) to accelerate soil consolidation. Meanwhile, geotextile and micropile reinforcements were used to improve embankment stability. The analysis of the existing embankment with a height of 9.2 m indicated that the rate of settlement in the 10th year was 53.4 cm/year. Based on these results, a 12 cm asphalt overlay is required and is planned to be applied in the 10th year after the road commenced operation in 2017. In addition, seven 60 cm diameter micropiles installed on one side are required to satisfy the slope stability requirements. The evaluation of the box culvert revealed that the structure already meets the minimum safety factor requirement; therefore, no additional reinforcement is necessary. For the proposed improvement, a combination of preloading and Prefabricated Vertical Drains (PVDs) with a spacing of 0.7 m was applied, accelerating the soil consolidation process and achieving the target degree of consolidation within 21 weeks. As the basal reinforcement, 49 layers of one-sided Polypropylene Woven Geotextile UW-20 with a design tensile strength of 100 kN/m were adopted. As an alternative reinforcement method, five 60 cm diameter micropiles installed on one side were also found to provide embankment stability that satisfies the required safety criteria.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Tanah Lunak, Konsolidasi, PVD, Geotextile, Micropile, Soft Soil, Settlement, PVD, Geotextile, Micropile
Subjects:	T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization
Divisions:	Faculty of Civil Engineering and Planning > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	I Made Deva Satria Mahadanta
Date Deposited:	28 Jul 2026 03:20
Last Modified:	28 Jul 2026 03:20
URI:	http://repository.its.ac.id/id/eprint/138393

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