Analisa Penyebab Kelongsoran Timbunan Dan Perencanaan Perkuatan Pada Jalan Tol Surabaya – Mojokerto Sta 14+500 S.D. 15+350

Septiandri, Rohmahillah Aviskanasya (2020) Analisa Penyebab Kelongsoran Timbunan Dan Perencanaan Perkuatan Pada Jalan Tol Surabaya – Mojokerto Sta 14+500 S.D. 15+350. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 03111640000035-Undergraduate_Thesis.pdf - Accepted Version Download (13MB)

Abstract

Jalan tol Surabaya - Mojokerto merupakan jalan tol yang menghubungkan Kota Surabaya dan Kota Mojokerto. Adanya jalan Tol tersebut diharapkan dapat memicu pertumbuhan ekonomi di sekitar kawasan yang dilaluinya. Selain kondisi topografi yang tidak rata, jalan tol Surabaya - Mojokerto juga dibangun di atas timbunan setinggi 10.0 meter. Pada STA 14+500 s.d STA 15+350 diketahui ketebalan lapisan tanah lunak mencapai 9.0 meter; hal ini kemungkinan menjadi penyebab terjadinya kelongsoran pada saat umur timbunan mencapai 3.0 bulan dengan ketinggian 8.0 meter dimana masih kurang dari tinggi timbunan rencana. Untuk itu perlu dilakukan evaluasi penyebab kelongsoran dan alternatif perbaikannya agar kelongsoran tidak terjadi lagi pada ruas jalan tol tersebut.
Dengan memperhatikan hasil observasi lapangan, data tanah, dan data teknis yang ada maka dapat dihitung angka keamanan dari stabilitas timbunan pada saat kelongsoran terjadi. Berdasarkan hasil perhitungan tersebut, kemudian dapat direncanakan sistem perkuatan timbunan dengan pemasangan geotextile, pemasangan spunpile pada tanah dasar dibawah timbunan, dan perencanaan slab on piles. Untuk perhitungannya, perlu diperhatikan kenaikan daya dukung akibat pemampatan yang telah terjadi selama 3.0 bulan oleh timbunan eksisting setinggi 8.0 meter. Hasil perencanaan 3 alternatif tersebut kemudian dievaluasi untuk mendapatkan perencanaan yang paling efisien.
Dari hasil observasi lapangan diketahui bahwa tidak ada perkuatan dan PVD yang dipasang dibawah timbunan. Sedangkan hasil analisa stabilitas lereng yang dilakukan diperoleh bahwa harga SF 0.887 s/d 1.157. Angka keamanan ini menunjukkan bahwa timbunan tersebut tidak stabil, dengan kata lain daya dukung tanah dibawah timbunan tidak mencukupi untuk menahan beban setinggi 8.0 meter sehingga terjadi kelongsoran.
Apabila alternatif perkuatan yang dipakai adalah geotextile, maka diperlukan 26 lapis dan per lapisnya terdapat 2.0 lembar geotextile tipe UW-250 52/52; total biaya material yang diperlukan untuk sebelah kanan dan kiri timbunan adalah sebesar Rp 106,996,623,000. Apabila perkuatan tanahnya menggunakan spunpile dengan diameter 30.0 cm, maka setiap meter panjang jalan diperlukan 38.0 buah spun pile untuk perkuatan di kanan kiri timbunan; total biaya material adalah Rp 79,853,109,750. Apabila direncanakan slab on piles, jumlah pondasi tiang diameter 60 cm dan panjang 22 meter yang diperlukan adalah 4 buah per meter panjang jalan; dimensi balok poer adalah 1.2 x 1.5 x 65 meter; dan ketebalan slab beton adalah 0.5 m; total biaya material adalah Rp 107,394,876,050. Dari tiga alternatif yang telah direncanakan tersebut, spunpile merupakan perencanaan yang memiliki harga material paling rendah daripada 2 alternatif yang lain. Oleh sebab itu perkuatan timbunan dengan pemasangan spunpile pada tanah dasarnya merupakan alternatif yang terpilih. ==================================================================================================================================
Surabaya - Mojokerto toll road is a toll road that connects the city of Surabaya and the city of Mojokerto. The existence of the toll road is expected to trigger economic growth around the area in its path. In addition to the uneven topography, the Surabaya - Mojokerto toll road was also built on a 10.0 meter heap. At STA 14 + 500 to STA 15 + 350 it is known that the thickness of the soft soil layer reaches 9.0 meters; this might be the cause of landslides when the embankment reaches 3.0 months with a height of 8.0 meters which is still less than the height of the planned heap. For this reason, it is necessary to evaluate the causes of landslides and their alternative repairs so that landslides do not occur again on the toll road section.
By observing the results of field observations, soil data, and technical data available, it can be calculated the safety number of the stability of the pile when the landslide occurs. Based on the results of these calculations, a pile reinforcement system can then be planned by geotextile installation, spunpile installation in subgrade under pile, and slab on piles planning. For the calculations, it is necessary to consider the increase in carrying capacity due to compression that has occurred for 3.0 months by the existing heap as high as 8.0 meters. The results of the 3 alternative plans are then evaluated to get the most efficient planning.
From the results of field observations note that there is no reinforcement and PVD is installed under the embankment. While the results of slope stability analysis carried out obtained that the price of SF 0.887 to 1.157. This security number indicates that the pile is unstable, in other words the carrying capacity of the soil under the pile is insufficient to withstand loads as high as 8.0 meters so that landslides occur.
If the alternative reinforcement used is geotextile, then it needs 26 layers and per layer there are 2.0 sheets of geotextile type UW-250 52/52; the total material cost required for the right and left of the pile is IDR 106,996,623,000. If the reinforcement of the land uses a spun pile with a diameter of 30.0 cm, then every meter of the length of the road is needed 38.0 pieces of spun pile for reinforcement on both sides of the pile; the total material cost is IDR 79,853,109,750. If slab on piles are planned, the number of pile foundations with a diameter of 60 cm and the required length of 22 meters is 4 pieces per meter of road length; the dimensions of the beam poer are 1.2 x 1.5 x 65 meters; and the thickness of the concrete slab is 0.5 m; the total material cost is IDR 107,394,876,050. Of the three alternatives that have been planned, spunpile is a plan that has the lowest material price compared to 2 other alternatives. Therefore strengthening the embankment by installing spunpile on the ground is the chosen alternative.

Item Type:	Thesis (Other)
Additional Information:	RSS 625.7 Sep a-1
Uncontrolled Keywords:	Landslide in Embankment, Reinforcement for Slope Stability, Subgrade Improvement, Geotextile, Spunpile, Slab on Piles, Surabaya - Mojokerto Highwa
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TA Engineering (General). Civil engineering (General) > TA658 Structural design T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Architecture > 23201-(S1) Undergraduate Thesis
Depositing User:	Rohmahillah Aviskanasya Septiandri
Date Deposited:	28 Apr 2023 07:44
Last Modified:	28 Apr 2023 07:44
URI:	http://repository.its.ac.id/id/eprint/73636

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