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All Journal Jurnal Sains dan Teknologi Jurnal Teknik Sipil Cendekia (JTSC) Jurnal Teknik Sipil Macca
Sanggamele, Herlina
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Engineering Mathematics Physics Social Sciences

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ANALYSIS OF LIMESTONE QUARRY SLOPE STABILITY, NIMBOKRANG DISTRICT, JAYAPURA REGENCY, PAPUA, INDONESIA Marcell Fandy, Patrick; Hutagalung, Minar Julita; Tambing, Frans Simbol; Belly Sahetapy, George; Sanggamele, Herlina
Jurnal Sains dan Teknologi Vol. 5 No. 3 (2024): Jurnal Sains Dan Teknologi
Publisher : CV. Utility Project Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/saintek.v5i3.2375

Abstract

Slope stability analysis generally uses the concept of factor of safety (FoS) value using several whole rock parameters. The slope stability analysis method that will be used in this research is the slope stability analysis method in open pit mines based on rock mass classification with the Rock Mass Rating (RMR) system and the Geological Strength Index (GSI) system and analyses the potential for landslides that can occur on slopes at that location with kinematics and limit equilibrium methods so that the type of landslide can be determined based on the intensity of the geological structure on the slope of the CV. Inti Jaya open pit limestone mine, in Wahab Village, Nimbokrang District, Jayapura Regency. This research aims to provide information on the current condition of the slope whether it is by safety standards, make slope engineering improvements and redesign safe slopes if unstable slope conditions are found. Research on the stability of limestone slopes begins with the collection of field data and rock samples. Furthermore, sample testing was carried out to obtain physical and mechanical properties and weighting of rock masses, which were then analysed to obtain the characteristics and quality of rock masses that would be applied using the finite element method with Slide 6 from Rocscience to determine the Factor of Safety (FK) and the design of safe slope geometry. The RMR value for slope 1 is 62, slope 2 is 61, and slope 3 is 62. So it can be concluded that the rock is included in rock mass class 2 with good quality. Based on the analysis of potential avalanche types, the three slopes have non-arc avalanche types. From the analysis carried out using Rocscience Slide 6.0 software, the FoS value for slopes in original, dry, and saturated conditions is obtained, where on slope 1: FoS in original conditions is 0.935, FoS in dry conditions is 1.619, and FoS in saturated conditions is 0.671. Then slope 2: FoS in original condition is 0.896, FoS in dry condition is 1.457, and FoS in saturated condition is 0.806. Slope 3: FoS in original condition is 3.490, FoS in dry condition is 4.199, and FoS in saturated condition is 3.368. So it can be concluded that slopes 1 and 2 are unsafe or unstable in original and saturated conditions so that landslides can occur. In the analysis of the FoS value of the actual condition of the slopes in the field using the Hoek & Brown method, the FoS value of slope 1 is 0.387, the FoS value of slope 2 is 0.579, and the FoS value of slope 3 is 1.272, it can be seen that the actual condition of the slopes in the field is slopes 1 and 2 in an unsafe or unstable state. Improvements must be made to the slope geometry to maintain the stability of the slope to remain safe or stable. The recommended improvement is to create a new working level for slopes 1 and 2, with steep height and large rock porphyry.
Analisis Erosi Menggunakan Sistem Informasi Geografis pada Daerah Aliran Sungai (DAS)Kamp Wolker Waena - Jayapura Widyastuti, Ira; Dualembang, Hery; Paseru, Riswandy Loly; Sanggamele, Herlina; Kombong , Eka Priska
Jurnal Teknik Sipil MACCA Vol. 10 No. 1 (2025): Jurnal Teknik Sipil MACCA (FEBRUARI 2025)
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/0e64gz27

Abstract

Erosi merupakan proses pelepasan dan pemindahan partikel tanah dari satu tempat ke tempat lain, yang umumnya disebabkan oleh aktivitas air hujan maupun angin. Dalam konteks Daerah Aliran Sungai (DAS), proses ini menyebabkan terjadinya akumulasi sedimen di saluran sungai yang berakibat pada penurunan kapasitas tampung aliran air. DAS Kamp Wolker menjadi wilayah yang strategis dalam aktivitas eksploitasi dan ekstraksi material karena keberadaan endapan sedimen serta batuan yang melimpah di sepanjang aliran sungai. Terbentuknya endapan tersebut erat kaitannya dengan proses erosi yang terus berlangsung di kawasan tersebut. Penelitian ini bertujuan untuk mengidentifikasi nilai laju erosi serta melakukan klasifikasi tingkat erosi di DAS Kamp Wolker dengan menggunakan pendekatan Universal Soil Loss Equation (USLE) yang diintegrasikan dengan analisis Sistem Informasi Geografis (SIG). Metode USLE melibatkan lima parameter utama, yaitu faktor erosivitas curah hujan (R), erodibilitas tanah (K), panjang dan kemiringan lereng (LS), pengelolaan tanaman (C), serta tindakan konservasi tanah (P). Melalui teknik overlay spasial, nilai erosi dihitung dan diklasifikasikan ke dalam lima kategori tingkat bahaya erosi, yaitu sangat ringan, ringan, sedang, berat, dan sangat berat. Hasil analisis menunjukkan bahwa rata-rata laju erosi di DAS Kamp Wolker mencapai 2,989 ton/ha/tahun. Distribusi kelas erosi di wilayah tersebut meliputi: sangat ringan (75,18%), ringan (10,96%), sedang (7,86%), berat (4,72%), dan sangat berat (1,32%). Temuan ini memberikan gambaran yang jelas mengenai kondisi kerentanan lahan terhadap erosi, yang dapat menjadi dasar dalam penyusunan strategi konservasi tanah dan pengelolaan DAS yang berkelanjutan.
A STUDY OF FINANCIAL FEASIBILITY OF MOANAMANI MICROHYDRO POWER PLANT (PLTMH) (A CASE STUDY IN EKEMANIDA VILLAGE, MOANAMI DISTRICT, DOGIYAI REGENCY) Widyastuti, Ira; R. L, Paseru; Dualembang, Hery; P. Kombong, Eka; Sanggamele, Herlina
JURNAL TEKNIK SIPIL CENDEKIA (JTSC) Vol 7 No 1 (2026): Februari
Publisher : Departement of Civil Engineering, Universitas Winaya Mukti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51988/jtsc.v7i1.415

Abstract

Micro Hydro Power Plants (PLTMH) with a capacity of <1MW are an alternative energy source to replace fossil fuels in remote areas, one of which is the PLTMH in Moanamani Distric, Papua Province, Indonesia, managed by PT. PLN (Ltd). Due to a construction collapse at the dam, the Moanamani Micro Hydro Power Plant is now sustaining damage that is harming other supporting facilities. Given the tight budget in the area, particularly in Dogiyai Regency, the goal of this study is to secure a capital finance and loan plan that can then be discussed by the pertinent stakeholders. This study analyzed the potentials of renewable energy and economic finance of the PLTMH, measuring the Net Present Value (NPV), Internal Rate of Return (IRR), Benefit Cost Ratio (BCR), Pay Back Period (PBP), and Break Event Point (BEP). The results showed that the debit of Tuka River could generate at least 65.50 kW of power and an annual energy of 50,546 kWh. The investment value of PLTMH at Moanamani Village was IDR 6,600,000,000, and the Cost of Goods Sold was IDR 336,384/kWh. Based on the economic calculation, the NPV of PLN Ltd was IDR 6,300,000,000, the NPV of the community was IDR 1,987,056,834, the IRR was -1,79%, the BCR was 0.32, the PBP was ± 20 years, and the BEP was ± 50 years. The development project of PLTMH with a funding scheme of 30% equity and 70% loan showed that the project was not financially feasible.
Co-Authors Dualembang, Hery Eka Priska Kombong George Belly Sahetapy Hutagalung, Minar Julita Marcell Fandy, Patrick R. L, Paseru Riswandy Loly Paseru tambing, frans simbol widyastuti, ira