Perencanaan Manajemen Air Hujan dan Perkuatan Lereng dengan Pendekatan Metode Cracked Soil, Studi Kasus: Lereng di Desa Mojodungkol, Situbondo, Jawa Timur

Natha, Nyoman Raditya Pradnya (2025) Perencanaan Manajemen Air Hujan dan Perkuatan Lereng dengan Pendekatan Metode Cracked Soil, Studi Kasus: Lereng di Desa Mojodungkol, Situbondo, Jawa Timur. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Desa Mojodungkol di Situbondo, Jawa Timur, terletak di lereng perbukitan dengan elevasi ±950 mdpl dan kemiringan lereng 10°–45°. Kasus keretakan rumah warga di lereng atas mengindikasikan potensi kelongsoran menerus. Tugas akhir ini menganalisis stabilitas lereng eksisting dan pendekatan tanah retak (cracked soil), serta merencanakan manajemen air hujan dan alternatif perkuatan lereng. Hasil analisis menunjukkan faktor keamanan (SF) lereng eksisting sudah memenuhi syarat. Namun, dengan pendekatan cracked soil, SF hanya berkisar 0,56–1,17 (<1,25), menunjukkan potensi ketidakstabilan. Alternatif perkuatan direncanakan berupa bored pile (diameter 400–800 mm, panjang 10–14 m, jumlah 1–6 buah/m’) dan ground anchor (free length 10 m, grouting 5,5 m, diameter 0,3 m, jumlah 3–7 buah/m’). Keduanya mampu meningkatkan SF menjadi >1,25. Untuk manajemen air hujan, direncanakan saluran drainase persegi (1×1 m dan 1,5×1,5 m) dengan kemiringan 0,005–0,01, serta 61 bangunan terjun setinggi 1,5 m akibat kontur curam. Horizontal drain berupa pipa PVC (panjang 15 m, diameter 2 inch) juga direncanakan. Ground anchor dipilih sebagai perkuatan paling efisien dan mudah diaplikasikan. Kombinasi perkuatan dan pengelolaan air ini terbukti efektif meningkatkan SF hingga >1,5, sehingga dapat menjadi solusi mitigasi longsor pada lereng alami di Desa Mojodungkol.
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Mojodungkol Village in Situbondo, East Java, is located on hilly terrain at an elevation of approximately 950 meters above sea level with slopes ranging from 10° to 45°. Cracks found in several houses on the upper slope indicate a potential risk of progressive landslides along the hillside. This undergraduate thesis aims to analyze the stability of the existing slope, assess conditions using a cracked soil approach, and design rainwater management and slope reinforcement alternatives. The slope stability analysis shows that the existing condition has a safety factor (SF) that meets minimum stability requirements. However, with the cracked soil approach, the SF ranges from 0.56 to 1.17, which is below the accepted threshold of 1.25, indicating instability and the need for reinforcement. Proposed slope reinforcements include bored piles with diameters of 400–800 mm, depths of 10–14 m, and 1–6 piles per meter, and ground anchors with a free length of 10 m, grouted length of 5.5 m, diameter of 0.3 m, and 37 anchors per meter. Both systems can raise the SF to above 1.25. For rainwater management, rectangular drainage channels of 1×1 m and 1.5×1.5 m are planned with slopes of 0.005–0.01, along with 61 drop structures, each 1.5 m high, to manage steep gradients. Horizontal drains using 2-inch diameter PVC pipes with lengths of 15 m are also designed. Ground anchors are considered the most efficient and practical solution. The combination of reinforcement and water management increases the SF to above 1.5, offering an effective landslide mitigation strategy.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Lereng Alami, Manajemen Air Hujan, Cracked Soil, Bored Pile, Micropile, Ground Anchor, Perkuatan Lereng,Natural Slope, Rain Water Management, Cracked Soil, Bored Pile, Micropile, Ground Anchor, Slope Stabilization
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization T Technology > TA Engineering (General). Civil engineering (General) > TA780 Piles and pile-driving
Divisions:	Faculty of Civil, Environmental, and Geo Engineering > Civil Engineering > 22201-(S1) Undergraduate Theses
Depositing User:	Nyoman Raditya Pradnya Natha
Date Deposited:	28 Jul 2025 01:17
Last Modified:	28 Jul 2025 01:17
URI:	http://repository.its.ac.id/id/eprint/121809

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