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All Journal Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Jurnal Konstruksi
Irawan, Diki Surya
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Environmental Science Industrial & Manufacturing Engineering

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Soil Bioengineering: Metode Alternatif Peningkatan Stabilitas Tanah Adriati, Fatin; Irawan, Diki Surya; Mihardja, Eli Jamilah
Jurnal Konstruksi Vol 22 No 2 (2024): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.22-2.1642

Abstract

Dalam dekade terakhir, terjadi peningkatan tanah longsor dan keruntuhan lereng yang signifikan. Guna menjawab permasalahan tersebut, stabilisasi lereng menggunakan metode geo-struktur menjadi sebuah kebutuhan. Seiring dengan perkembangan metode geo-struktur, metode soil bioengineering menjadi alternatif dalam stabilisasi lereng, baik untuk lereng alami maupun lereng buatan. Soil bioengineering sendiri merupakan metode ramah lingkungan untuk stabilisasi dan perkuatan pada lahan miring (lereng) melalui penanaman vegetasi. Tujuan penelitian ini adalah untuk membandingkan antara metode geo-struktur (menggunakan soil nailing dan perkuatan tiang) dan metode soil bioengineering (menggunakan vetiver grass dan switchgrass) dalam stabilisasi lereng. Analisis stabilitas lereng dilakukan dengan menggunakan metode elemen hingga dan mempertimbangkan nilai faktor keamanan (SF). Jika dibandingkan dengan metode geo-struktur, metode soil bioengineering ternyata mampu menandingi sebagai metode stabilisasi lereng pada tiga kondisi tanah yang berbeda, yaitu kondisi tanpa air, kondisi jenuh, dan kondisi tidak jenuh. Metode soil nailing menghasilkan pengaruh paling besar dalam peningkatan stabilitas lereng (SF = 1.384 – 3.096), sedangkan yang berpengaruh paling kecil adalah metode perkuatan tiang (SF = 1.045 – 2.236). Metode soil bioengineering dengan menggunakan switchgrass (SF = 1.060 – 2.322) dan vetiver grass (SF = 1.090 – 2.449), berada pada tingkat menengah di antara metode soil nailing dan perkuatan tiang. Bisa dikatakan bahwa metode soil bioengineering cukup setara dengan metode perkuatan tiang dalam meningkatkan nilai SF meskipun masih jauh di bawah metode soil nailing. Dengan demikian, metode soil bioengineering terbukti dapat menggantikan metode geo-struktur dalam meningkatkan stabilitas lereng.
Study of Physical Water Loss in Water Distribution Network using Step Test Method and Pressure Calibration Azwar, Erizaldy; Irawan, Diki Surya; Naufal, Muhammad
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 6, No 1 (2021): EDISI MARET 2021
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v6i1.2293

Abstract

Water distribution networks that are unoptimally operated can cause various problems so that water flows are not evenly distributed to consumers. One of the causes is the high water loss level due to leaks in the distribution pipeline system, as one of the water operators in Jakarta, Indonesia, PT. XYZ has tremendous efforts to improve the water supply system. One of them is to reduce physical water losses. The estimated percentage of physical water losses of water distribution networks in Green Garden District, West Jakarta, in April 2018 has amounted to 30%. It is still above the tolerance standard for the national water loss rate in Indonesia's Water Utilities, around 20%. It is necessary to reduce water loss to overcome this problem. After performing a step test program in the Green Garden District, it was found that there was a water loss of 84 lps in July 2018, which increased to 103.16 l/sin in May 2019 or showed an increase of 23%. Then, a pressure calibration was undertaken by placing six pressure monitoring points on the district in May 2019 using hydraulic simulation from WaterGEMS V.10. This calibration obtained the highest pressure Gap at pressure monitoring point #5 of 2.5 mH2O and the lowest pressure monitoring point #1 of 1.03 mH2O. Subsequently, leak detection measures were conducted to reduce physical water loss from January to May 2019,  PT. XYZ water distribution network uses two leak detection methods, visible and invisible leak detections, which had successfully reduced its net night flows (NNFs). The leak repairs obtained 77 leak points, which consisted of 32 visible leaks and 45 invisible leaks. Total estimated leakage flows of 5.33 lps were obtained from the decrease in the net night flow, which indicates a decrease in physical water loss by 16% from January to March 2019.
Co-Authors Adriati, Fatin Azwar, Erizaldy Eli Jamilah Mihardja Muhammad Naufal, Muhammad