Budiarjo, Ridwan (2018) Perencanaan Abutment dan Perbaikan Tanah Dasar untuk Oprit Jembatan Tulang Bawang di Jalan Tol Terbanggi Besar - Kayu Agung STA 48+450. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pembangunan jalan tol Terbanggi Besar – Kayu Agung di STA 48+300 sampai STA 48+550 melewati sungai Tulang Bawang dengan lebar sungai 150 m, sehingga diperlukan perencanaan jembatan untuk melewati sungai tersebut yaitu Jembatan Tulang Bawang. Jembatan Tulang Bawang mempunyai bentang total 150 m dan di belakang masing - masing abutment akan direncanakan oprit jembatan dengan timbunan setinggi 8,5 m. Oprit jembatan berdiri diatas tanah dasar dominan lempung lunak dengan NSPT kurang dari 10 sampai kedalaman 15 m. Tanah dasar memiliki daya dukung yang rendah yang dapat mengakibatkan kelongsoran pada timbunan oprit dan memiliki kemampumampatan tinggi yang dapat mengakibatkan perbedaan konsolidasi (differential settlement). Dibutuhkan alternatif metode perbaikan dan perkuatan tanah dasar timbunan agar mampu menahan beban sehingga kelongsoran dan perbedaan penurunan konsolidasi tidak terjadi.
Pada Tugas Akhir ini struktur bawah jembatan Tulang Bawang akan direncanakan 2 buah pilar dan 2 buah abutment. Perencanaan abutment jembatan harus dianalisa tinggi scouring yang bertujuan agar abutment aman terhadap gerusan. Timbunan oprit sendiri direncanakan dengan 2 variasi kemiringan yaitu timbunan tegak dan timbunan miring (kemiringan 1:2). Kondisi tanah dasar yang kurang baik maka direncanakan perbaikan tanah dasar untuk oprit jembatan dengan preloading yang dikombinasi dengan PVD serta ditambah dengan perkuatan. Perkuatan pada timbunan oprit tegak yaitu menggunakan geotextile wall dan micropile. Perkuatan pada timbunan oprit miring yaitu variasi antara geotextile atau stone column. Perkuatan tersebut bertujuan untuk meningkatkan daya dukung tanah serta mengatasi kelongsoran. Analisa alternatif yang akan dipakai akan ditinjau dari biaya material yang ekonomis.
Hasil perencanaan perkuatan timbunan oprit miring didapatkan kebutuhan geotextile adalah 55 lapis. Untuk perkuatan geotextile wall arah memanjang jembatan diperoleh sebanyak 20 lapis. Hasil perhitungan perkuatan tanah dengan stone column didapatkan kebutuhan stone column yaitu 16 buah (2 sisi) dengan panjang 12 m. Hasil perencanaan perkuatan timbunan oprit tegak didapatkan kebutuhan geotextile wall adalah 20 lapis. Untuk perkuatan geotextile wall arah memanjang jembatan diperoleh sebanyak 20 lapis. Untuk perkuatan dengan micropile didapatkan kebutuhan micropile adalah 12 buah/m (2 sisi) dengan panjang 17 m.
Dari kedua perencanaan oprit timbunan dipilih perencanaan timbunan oprit tegak karena mempunyai biaya material yang lebih ekonomis. Pondasi abutment dengan tiang pancang diameter 40 cm sebanyak 140 buah dan kedalaman tiang 24 meter.================ Construction of toll road Terbanggi Besar - Kayu Agung in STA 48 + 300 to STA 48 + 550 through river Tulang Bawang with 150 m wide river, so it is necessary planning bridge to pass the river is Tulang Bawang Bridge. Tulang Bawang Bridge has a total span of 150 m and behind each abutment will be planned an approach with high as 8.5 m. The approach of bridge stands on the ground of dominant soft clay with NSPT less than 10 until 15 m depth. The bottom soil has a low bearing capacity that can occur sliding on approach and has a high settlement that can occur to differential settlement. An alternative method to improve and reinforcement of embankment soil is required in order to be able to withstand the load so that sliding and consolidation do not occur.
In this Final Project lower structure of the bridge will be planned 2 piers and 2 abutments. Planning of bridge abutment should be analyzed high scouring aimed to abutment safe against scouring. The approach of bridge is planned with 2 variations of slope that is upright embankment and sloping embankment (slope 1: 2). The bottom soil condition is not good then planned ground soil improvement for approach of bridge with preloading which combined with PVD and added with reinforcement. Reinforcement on upright embankment using geotextile wall and micropile. Reinforcement on sloping embankment is a variation between geotextile or stone column. The reinforcement aims to increase the bearing capacity of the soil and to overcome sliding. The alternative analysis will be reviewed from the cost of the economical material.
The result of reinforcing slope embankment is obtained the need of geotextile is 55 layers. For the longitudinal reinforcement obtained need as many as 20 layers of geotextile walls. Result of reinforcement with stone column obtained need 16 units of stone column (2 sides) with the depth of stone column is 12 meters. The result of reinforcement of upright embankment obtained the need of geotextile wall is 20 layers. For the longitudinal reinforcement obtained need as many as 20 layers of geotextile walls. For micropile reinforcement obtained needs are 12 units/ m (2 sides). The depth of the micropile is 17 meters.
Based on two approach planning selected the upright embankment plan because it has less material cost. The foundation of abutment is pile with diameter 40 cm as many as 140 units with the depth of the pile is 24 meters.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSS 624.2 Bud p-1 |
| Uncontrolled Keywords: | Abutment, Geotextile, Micropile, Prefabricated Vertical Drain, Stone Column |
| Subjects: | 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 T Technology > TA Engineering (General). Civil engineering (General) > TA775 Foundations. T Technology > TG Bridge engineering |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Civil Engineering > 22201-(S1) Undergraduate Theses |
| Depositing User: | Budiarjo Ridwan |
| Date Deposited: | 22 Nov 2018 20:35 |
| Last Modified: | 21 Apr 2021 09:54 |
| URI: | http://repository.its.ac.id/id/eprint/53080 |
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