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Vibration Impact on Potentially Liquefactions Slope Deformation Yusuf, Rakhmat; Haryadhi, Yayan; Dermawan, Herwan
Civil and Environmental Science Journal (CIVENSE) Vol 4, No 1 (2021)
Publisher : Fakultas Teknik UB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.civense.2021.00401.1

In an area that has potential for earthquake has possibility of losing soil stability and causing physical soil damage, one of them is liquefaction. This research was conducted to determine the magnitude of deformation on slopes with potentially liquefaction. The soil slope samples were tested using shaking table with slope 6Â°, 12Â°, 18Â°, 24Â° and the frequency was set 6.6 Hz, 7.4 Hz, 8 Hz, 9.5 Hz. Research began with examination of soil physical properties which had unit weight of density 1.81 gr/cm3, moisture content 2.31%, specific gravity 2.72, sand with coefficient of uniform is 2.1, coefficient curvature is 0.98 and angle of repose is 23.962Â°. By giving earthquake acceleration of 0.4g, 0.5g, 0.6g and 0.7g in the soil slope sample that was tested by shaking table, it was liquefaction occurred. Results of research, the greater slope and frequency given, so the lateral and axial deformation will increase. Minimum lateral deformation occurs at frequency 6.6 Hz with a slope 6Â° and maximum lateral deformation is 17 cm at frequency 9.5 Hz with a slope 24Â°, while minimum axial deformation is 0.5 cm at frequency 8 Hz with a slope 6Â° and a maximum axial deformation is 5 cm at frequency 9.5 Hz with a slope 24Â°, but 12-degree slope can considered as a safe slope for slope which holding vibration.

STUDI REDUKSI BANJIR DENGAN KOLAM RETENSI PADA SUNGAI-SUNGAI PARALEL Rakhmat Yusuf
Jurnal Teknik Sipil dan Teknologi Konstruksi Vol 8, No 1 (2022): Jurnal Teknik Sipil dan Teknologi Konstruksi
Publisher : Universitas Teuku Umar

Flood in Ujungberung region occurs when rainy season. The location of the Ujungberung region is in the Bandung basin area from the upstream river originating at the Mount Manglayang. The impact of floods that occur is disrupting the drainage flow, settlement, traffic and economic land use such as markets, and agriculture in the region. The government has made some prevention efforts by constructing three Retention Basin on the Cinambo River, Cipamulihan River, and Cilameta River. There isn’t analysis on how much the optimal reduction in flood discharge and reservoir volume. In this study using a quantitative approach and descriptive method. Retanding basin analysis is based on the 25-years hydrological flood discharge using the Snyder method HEC-HMS v4.3 software. From the results of the Retention Basin modeling, it was found that in the Cinambo River with the initial discharge of Q25 is 37.70 m3/sec become 11.10 m3/sec can be reduced by 70.56 % with an optimal storage volume of 143,300 m3, in the Cipamulihan River with the initial discharge of Q25 is 19.20 m3/sec become 8.10 m3/sec can be reduced by 57.81 % with an optimal storage volume of 143,300 m3, and in the Cilameta River with the initial discharge of Q25 is 13.40 m3/sec become 9.3 m3/sec can be reduced by 30.60% with an optimal storage volume of 23,100 m3. If the Retention Basin planned to be carried out with an optimal storage volume, it must be adjusted to the available retention land area and with a required dimension.

MODIFIKASI KOEFISIEN DAYA DUKUNG AKSIAL PONDASI TIANG BERDASARKAN BACK ANALYSIS PADA DATA LOADING TEST Fauzi Lukman Najib; Herwan Dermawan; Rakhmat Yusuf
Kokoh Vol 20, No 1 (2022): Kokoh : Volume 20, Issue 1, Tahun 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1153.241 KB)

The axial bearing capacity of the pile foundation is needed to determine the number of foundations required to carry the structural load. Calculation of the axial bearing capacity pile foundation produces a carrying capacity different from the results of loading tests in the field. The difference between the bearing capacity design with loading test result can make a waste of the number of poles used. To make effective use of the number of piles, the bearing capacity design is necessary to modify the coefficient so that bearing capacity design is closer to the results of the loading test. The result of the modification the bearing capacity of the clay soil in an increase that is not much different from the initial coefficient but is strongly influenced by the value of the internal friction angle which can make the coefficient increase twice. For cohesionless soil, ultimate base resistance there is an average value of 56.75 tsf for N-SPT 50.

MODIFIKASI KOEFISIEN DAYA DUKUNG AKSIAL PONDASI TIANG BERDASARKAN BACK ANALYSIS PADA DATA LOADING TEST Fauzi Lukman Najib; Herwan Dermawan; Rakhmat Yusuf
Kokoh Vol 20, No 1 (2022): Januari 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar

The axial bearing capacity of the pile foundation is needed to determine the number of foundations required to carry the structural load. Calculation of the axial bearing capacity pile foundation produces a carrying capacity different from the results of loading tests in the field. The difference between the bearing capacity design with loading test result can make a waste of the number of poles used. To make effective use of the number of piles, the bearing capacity design is necessary to modify the coefficient so that bearing capacity design is closer to the results of the loading test. The result of the modification the bearing capacity of the clay soil in an increase that is not much different from the initial coefficient but is strongly influenced by the value of the internal friction angle which can make the coefficient increase twice. For cohesionless soil, ultimate base resistance there is an average value of 56.75 tsf for N-SPT 50.Keywords: Bearing capacity, Coefficient, modification, Loading test, Pile foundation

SOSIALISASI PENINGKATAN SUPPLY AIR BERSIH DI DESA SIDAMULYA KECAMATAN JALAKSANA KABUPATEN KUNINGAN TAHUN 2024 Masri, Rina Marina; Mardiani, Mardiani; Nurasiyah, Siti; Istiqomah, Istiqomah; Yusuf, Rakhmat; Supratman, Odih; Desilia, Asrinia; Hapsari, Alya Sekar
Jurnal Pengabdian Masyarakat Teknik Vol. 7 No. 2 (2025): Jurnal Pengabdian Masyarakat Teknik (JPMT)
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jpmt.7.2.79-84

Ketersediaan air bersih merupakan faktor penting bagi kelangsungan hidup manusia dan lingkungan. Desa Sidamulya di Kecamatan Jalaksana, Kabupaten Kuningan, menghadapi tantangan dalam menyediakan pasokan air bersih yang memadai bagi penduduk dan sektor pertanian. Untuk mengatasi permasalahan ini dan mendukung tujuan keenam dari Sustainable Development Goals (SDGs), yaitu memastikan ketersediaan dan pengelolaan air bersih secara berkelanjutan, dilakukan kegiatan pengabdian masyarakat berupa sosialisasi peningkatan supply air bersih. Kegiatan ini melibatkan metode partisipatoris, meliputi Focus Group Discussion (FGD), pelaksanaan program sosialisasi, serta monitoring dan evaluasi. Sosialisasi dilaksanakan melalui ceramah, diskusi, dan pelatihan untuk meningkatkan pemahaman masyarakat tentang pentingnya pengelolaan air bersih dengan teknologi yang ramah lingkungan. Hasil evaluasi menunjukkan bahwa 51% peserta merasa puas, dan 49% sangat puas terhadap kegiatan ini, serta memahami manfaat dari peningkatan supply air bersih dengan teknologi terbaru. Implementasi dari kegiatan ini diharapkan dapat memberikan solusi jangka panjang bagi Desa Sidamulya dalam upaya mewujudkan pembangunan berkelanjutan. Kata kunci: Supply Air Bersih, Desa Sidamulya, Pembangunan Berkelanjutan, Sosialisasi, Pengelolaan Air.

Implementation of Low Impact Development for Reducing Surface Runoff: A Case Study of Bumi Harapan Residential Area, Cileunyi Ulhaq, Naya Dhia; Yusuf, Rakhmat
Portal: Jurnal Teknik Sipil Vol 17, No 2 (2025): October Edition
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/portal.v17i2.7738

This study analyzes surface runoff and evaluates the effectiveness of Low Impact Development (LID) in the Bumi Harapan residential area, Cileunyi District, Bandung Regency. A descriptive quantitative method was applied using hydrological modeling with PCSWMM. Rainfall data from Cibiru and Cileunyi stations were analyzed, and the log normal distribution with a 2-year return period (83.22 mm) was selected. Rainfall intensity was modeled using the SCS Type I method with a 15-minute interval. The drainage model consisted of 26 subcatchments, 108 junctions, 133 conduits, 1 pump, and 2 outfalls. Initial results showed an average runoff of 79.92 mm, ranging from 65.89 mm (S24) to 81.63 mm (S18). After applying LID controls (rain barrels, rain gardens, bioretention, and permeable pavements), runoff volume decreased significantly—up to 64%, with reductions from 61.61 mm (S26) to 4.29 mm (S24). These results highlight LID’s potential for sustainable stormwater management.

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