Analisis Kestabilan Galian Lereng Berdasarkan Aspek Geometri Dan Infiltrasi Hujan Pada Ruas Jalan Pantai Molang-Bululawang Sta 0+225 Sd 0+550 Blitar

Damayanti, Eka (2022) Analisis Kestabilan Galian Lereng Berdasarkan Aspek Geometri Dan Infiltrasi Hujan Pada Ruas Jalan Pantai Molang-Bululawang Sta 0+225 Sd 0+550 Blitar. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Ketidakstabilan lereng kupasan/galian pada badan jalan yang sering terjadi adalah kelongsoran. Hal ini disebabkan karena geometri lereng (kemiringan dan ketinggian lereng), sifat fisik dan mekanik tanah-batuan pada lereng, infiltrasi hujan, dan intensitas hujan. Hal ini berpengaruh pada nilai angka keamanan stabilitas lereng. Angka keamanan yang terjadi harus sama atau lebih besar dari nilai angka keamanan yang diijinkan.
Pada pembangunan jalan di Ruas Pantai Molang-Bululawang Sta 0+225 sd 0+550 ini, terdapat kemiringan lereng 2V:1H dengan struktur lereng didominasi oleh tanah dan batuan. Penelitian yang akan dilakukan pada lokasi ini terkait dengan ketinggian lereng (5 m, 10m, dan 15 m), rasio kemiringan lereng (1,5:1dan 1:1), intensitas curah hujan (5 mm/jam dan 60 mm/jam), dan durasi hujan (tanpa hujan, hujan 1-7 hari, hujan 1 jam, 3 jam, dan 5 jam). Hasil dari penelitian akan dilihat angka keamanan pada masing-masing pemodelan variasi, perubahan muka air tanah pada lereng akibat infiltrasi.
Dari hasil penelitian didapatkan bahwa semakin tinggi lereng, semakin curam lereng, intensitas hujan semakin besar, dan durasi hujan semakin panjang akan menurunkan nilai angka keamanan. Pada kondisi tanpa hujan dan hujan 1-7 hari jika dibandingkan terhadap ketinggian lereng 5 meter dan variasi rasio kemiringan lereng (2:1, 1,5:1, dan 1:1) maka terjadi penurunan nilai angka keamanan sebesar 35,21% pada ketinggian lereng 10 meter dan 39,28% pada ketinggian lereng 15 meter. Pada kondisi intensitas hujan 5 mm/jam dan 60 mm/jam dengan durasi hujan 1 jam, 3 jam, dan 5 jam terjadi penurunan nilai angka keamanan sebesar 34,95% pada ketinggian lereng 10 meter dan 39,47% pada ketinggian lereng 15 meter.
Perkuatan ground anchor dapat digunakan sebagai alternatif perkuatan lereng karena dapat menaikkan nilai angka keamanan sebesar 15,1% dibandingkan jika menggunakan soil nailing yang hanya menghasilkan kenaikan nilai angka keamanan sebesar 1,2%.
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The instability of the excavation slope on the main road that often occurs is landslides. This is due to slope geometry (slope and slope height), physical and mechanical of soil-rock on the slopes, rain infiltration, and rainfall intensity. This affects the value of the safety of the slope safety. The safety value that occurs must be equal to or greater than the allowable safety value.
In the road construction on the Molang-Bululawang Beach road section 0+225 to 0+550, there is a 2V:1H slope with a slope structure dominated by soil and rock. The research that will be carried out at this location is related to the height of the slopes (5 m, 10 m, and 15 m), the slope ratio (1,5:1 and 1:1), the intensity of rainfall (5 mm/hour and 60 mm/hour), and duration of rain (no rain, 1-7 days of rain, 1 hour of rain, 3 hours, and 5 hours)/ The result of the research will be seen in the number of safety in each modeling variation, change in groundwater level on the slopes due to infiltration.
From the result of the research, it was found that the higher the slope, the steeper the slope, the greater the intensity of the rain, and the longer the duration of the rain, the lower the safety value. In conditions without rain and rain 1-7 days when compared to a slope height of 5 meters and a variation of the slope ratio (2:1, 1,5:1, and 1:1) there is a decrease in the safety value of 35,21 of 35,21% at an altitude slope of 10 meters and 39,28% at height of 15 meters. In conditions of 5 mm/hour and 60 mm/hour rain intensity with a rain duration of 1 hour, 3 hours, and 5 hours there was a decrease in the safety value of 34,95% at a slope height of 10 meters and 39,4% at a slope height of 15 meters.
Ground anchor reinforcement can be used as an alternative to slope reinforcement because it can increase the safety value by 15,1% compared to using soil nailing which only results in an increase in the safety value of 1,2%.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	ketidakstabilan lereng, kemiringan lereng, ketinggian lereng, jenis tanah, curah hujan, pengaman lereng. Molang-Bululawang, The slope instability, slope, slope height, type of soil, rainfall, slope guard, Molang-Bululawang
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Eka Damayanti
Date Deposited:	10 Feb 2022 01:24
Last Modified:	31 Oct 2022 02:43
URI:	http://repository.its.ac.id/id/eprint/93315

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