Analisis Desain Eksisting Perkuatan Lereng Pada Tanah Clay Shale Dan Alternatif Modifikasinya Studi Kasus: Ruas Jalan Awunio – Lapuko Sta 4+955 – 5+015 Provinsi Sulawesi Tenggara

Azhari, Ahmad (2024) Analisis Desain Eksisting Perkuatan Lereng Pada Tanah Clay Shale Dan Alternatif Modifikasinya Studi Kasus: Ruas Jalan Awunio – Lapuko Sta 4+955 – 5+015 Provinsi Sulawesi Tenggara. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada ruas jalan Awunio – Lapuko terjadi kelongsoran pada STA 4+955 sampai STA 5+015 yang menyebabkan bahu jalan runtuh dan diperkirakan penyebabnya adalah adanya air yang masuk ke dalam tanah sehingga memengaruhi sifat clay shale. Analisis stabilitas lereng eksisting beserta perencanaanya perlu dilakukan. Apabila stabilitasnya tidak memenuhi persyaratan maka perlu dilakukan perencanaan manajemen air dan perkuatan alternatif. Analisis stabilitas lereng dilakukan terhadap lereng eksisting dan terhadap desain eksisting dengan menggunakan metode perhitungan manual dan program bantu GEO5. Stabilitas yang ditinjau berupa stabilitas terhadap geser, ambles/ tilting, dan overall stability. Analisis stabilitas lereng eksisting ternyata aman dari kejadian longsor namun hal ini bertolak belakang dengan kejadian di lapangan, oleh sebab itu dalam studi ini digunakan pendekatan crack soil untuk mendapatkan gambaran kondisi longsor di lapangan; lereng jalan diperoleh SF sebesar 0,95. Desain eksisting berupa DPT setinggi 2,5 m dengan bored pile berdiameter 50 cm sedalam 8 m menghasilkan stabilitas lereng dengan SF sebesar 7,91 yang berarti aman tetapi terlalu boros. Perencanaan sistem manajemen air mendapatkan kapasitas saluran drainase masih mampu menampung debit air yang terjadi akibat hujan. Pembuatan subdrain terbukti meningkatkan SF pada lereng dari SF 0,95 menjadi 1,38, hanya saja masih diperlukan perkuatan tambahan. Perencanaan alternatif DPT setinggi 2,5 m dengan bored pile berdiameter 40 cm dengan kedalaman 3 m menghasilkan stabilitas lereng sebesar 3,29. Apabila struktur DPT diganti dengan batu kali dengan bored pile diameter 30 cm dengan kedalaman 3 m menghasilkan SF sebesar 2,18. Apabila dikerjakan alternatif subdrain dengan perkuatan tambahan bronjong menghasilkan stabilitas lereng menjadi 2,23 serta desain alternatif menggunakan geotekstil menghasilkan stabilitas lereng dengan SF sebesar 1,77 sehingga semua perkuatan alternatif aman dan memenuhi persyaratan stabilitas.
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On the Awunio – Lapuko road section, there was a landslide from STA 4+955 to STA 5+015, causing the roadside to collapse. The probable cause is water infiltration into the soil, affecting the clay shale properties. An analysis of the existing slope stability and its planning needs to be carried out. Water management planning and alternative reinforcement are necessary if the stability does not meet the requirements. Slope stability analysis is conducted on the existing slope and existing design using manual calculation methods and the GEO5 assistance program. The stability considered includes shear stability, tilting, and overall stability. The analysis reveals that the existing slope stability is safe from landslides. However, this contradicts the field observations. Therefore, a crack soil approach is used in this study to assess the landslide conditions in the field, resulting in a safety factor (SF) of 0.95 for the road slope. The existing design, a 2.5 m high retaining wall with bored piles of 50 cm diameter and a depth of 8 m, yields slope stability with an SF of 7.91, indicating safety but being excessively costly. The water management system planning indicates that the drainage channel capacity can handle the water discharge from rainfall. Introducing subdrains improves the slope stability from SF 0.95 to 1.38, but additional reinforcement is still needed. An alternative design with a 2.5 m high retaining wall and bored piles of 40 cm diameter and 3 m depth yields a slope stability 3.29. Replacing the retaining wall structure with natural stone using bored piles of 30 cm diameter and 3 m depth results in an SF of 2.18. If an alternative subdrain with additional gabion reinforcement is implemented, the slope stability becomes 2.23. Additionally, an alternative design using geotextiles results in slope stability with an SF of 1.77. All alternative reinforcements are deemed safe and meet stability requirements.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	clay shale, stabilitas lereng, DPT dengan bored pile, bronjong, subdrain, slope stability, retaining wall with bored pile, gabion, subdrain
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA760+ Retaining walls
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	A. Azhari
Date Deposited:	05 Feb 2024 03:07
Last Modified:	05 Feb 2024 03:07
URI:	http://repository.its.ac.id/id/eprint/106009

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