Analisa Pengaruh Infiltrasi Hujan Terhadap Stabilitas Lereng Sta 62+450 S/D 62+825 Pada Proyek Jalan Tol Seksi Sp. Indralaya – Prabumulih

Oktaliyani, Tiara (2024) Analisa Pengaruh Infiltrasi Hujan Terhadap Stabilitas Lereng Sta 62+450 S/D 62+825 Pada Proyek Jalan Tol Seksi Sp. Indralaya – Prabumulih. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangunan Jalan Tol Simpang Indralaya-Muara Enim Seksi Simpangan Indralaya-Prabumulih, mengalami longsor setelah di gali pada STA 62+450 sampai dengan 62+825. Analisis tanah menunjukkan bahwa daerah tersebut mengandung lempung berpasir dengan konsistensi kaku, dan hasil uji sondir mengungkapkan campuran silty sand hingga silty clay pada kedalaman 5 hingga 10 meter. Permukaan air tanah berada jauh di bawah permukaan. Tujuan dari penelitian ini adalah untuk memeriksa stabilitas lereng, dampak infiltrasi air hujan, serta metode perkuatan hydroseeding dan dinding penahan tanah, beserta faktor-faktor yang mempengaruhi longsor. Metodologi penelitian menggunakan program Slope/W dan Seep/W dari GeoStudio 2024.2.1. Fokus penelitian adalah menghitung faktor keamanan pada durasi hujan yang berbeda (1 jam, 3 jam, dan 5 jam). Hasil penelitian menunjukkan bahwa bidang gelincir pada lokasi longsor terbentuk pada lapisan tanah yang jenuh air, menyebabkan kelongsoran berupa rayapan atau longsor permukaan. Infiltrasi hujan memperburuk stabilitas lereng dengan meningkatkan berat tanah dan menurunkan kohesi serta kuat geser tanah. Penurunan nilai Safety Factor (SF) terjadi seiring dengan durasi hujan, dengan penurunan tertinggi sebesar 30,24% pada durasi 5 jam. Penggunaan metode hydroseeding dengan penanaman vegetasi meningkatkan stabilitas lereng, dengan nilai SF meningkat sebesar 15,96%. Penerapan dinding penahan tanah (DPT) terbukti efektif dalam meningkatkan stabilitas lereng, dengan peningkatan SF mencapai 60,89%. Selain itu, stabilitas lereng dipengaruhi oleh faktor ketinggian, kemiringan lereng, serta ketebalan perkuatan hydroseeding dan DPT, di mana penurunan SF terjadi pada lereng yang lebih tinggi dan semakin curam. Kesimpulan penelitian ini menunjukkan bahwa penguatan lereng melalui vegetasi hydroseeding dan Dinding Penahan Tanah sangat diperlukan untuk menjaga stabilitas lereng dalam menghadapi pengaruh infiltrasi hujan.
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The construction of the Simpang Indralaya-Muara Enim Toll Road, Section Simpang Indralaya-Prabumulih, experienced landslides after excavation was carried out at STA 62+450 to 62+825. Soil analysis indicated that the area consists of clayey sand with a stiff consistency, and cone penetration test (CPT) results revealed a mixture of silty sand to silty clay at a depth of 5 to 10 meters. The groundwater table is located far below the surface. The aim of this study is to examine the slope stability, the impact of rainfall infiltration, and the effectiveness of reinforcement methods using hydroseeding and retaining walls, as well as the factors influencing the landslides. The research methodology utilized the Slope/W and Seep/W programs from GeoStudio 2024.2.1. The study focused on calculating the safety factor (SF) for different rainfall durations (1 hour, 3 hours, and 5 hours). The results showed that the slip surface at the landslide location formed in water-saturated soil layers, causing slope failures such as creep or surface landslides. Rainwater infiltration worsened the slope stability by increasing the soil weight and reducing cohesion and shear strength. The SF decreased with increasing rainfall duration, with the highest decrease of 30.24% occurring after 5 hours of rainfall. The application of hydroseeding, using vegetation, improved slope stability, increasing the SF by 15.96%. The use of retaining walls (DPT) proved effective in enhancing slope stability, with an SF increase of 60.89%. Furthermore, slope stability was influenced by factors such as slope height, slope steepness, and the thickness of hydroseeding and DPT reinforcement, where higher and steeper slopes showed a decrease in SF. The study concludes that slope reinforcement through hydroseeding and retaining walls is essential for maintaining slope stability in the face of rainfall infiltration.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	hydroseeding, lereng, Sp. Indralaya, Prabumulih, GeoStudio 2024.2.1, Infiltrasi Hujan, Dinding Penahan Tanah
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization T Technology > TE Highway engineering. Roads and pavements > TE175 Road and highway design
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Tiara Oktaliyani
Date Deposited:	23 Jan 2025 08:49
Last Modified:	23 Jan 2025 08:49
URI:	http://repository.its.ac.id/id/eprint/116777

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