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All Journal Journal of Infrastructure and Facility Asset Management
Khoiri, Mohamad
Civil Engineering Dept. ITS, Surabaya, Indonesia
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Energy Engineering Environmental Science Library & Information Science Mathematics Transportation

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Analysis of Existing Slope Reinforcement Design on Clay Shale Soil and Its Alternative Modifications: A Case Study of the Awunio – Lapuko Road Section Sta 4+955 – 5+015 in the Southeast Sulawesi Province Azhari, A.; Khoiri, Mohamad; Siagian, Freddy
Journal of Infrastructure & Facility Asset Management Vol 6, No 1 (2024): Journal of Infrastructure & Facility Asset Management
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/jifam.v6i1.19889

Abstract

A landslide occurred in the Awunio – Lapuko road section from STA 4+955 to STA 5+015, causing the road shoulder to collapse. It is estimated that the cause of this is the entry of water into the soil, affecting the properties of clay shale. An analysis of the existing slope stability and its planning needs to be done. Water management planning and alternative reinforcement are necessary if the stability does not meet the requirements. The slope stability analysis is conducted on the existing slope and the existing design using manual calculation methods and the GEO5 software. The stability aspects considered include overturning stability, sliding stability, bearing capacity, and overall stability. The analysis of the existing slope stability shows safety from landslide incidents. However, this contradicts the field observations, so a crack soil approach is used to understand the landslide conditions in the field, resulting in a safety factor (SF) of 0.95. The existing design, which includes a retaining wall with bored piles, yields a slope stability with an SF of 7.87. Water management system planning indicates that the drainage channel capacity can still accommodate the water flow resulting from rainfall. The construction of subdrains increases the SF on the slope to 1.38 but requires additional reinforcement. The retaining wall design with bored pile results in a slope stability 2.11. Meanwhile, the alternative of subdrains with additional geotextile reinforcement yields a slope stability of 1.96. The alternative geotextile design achieves slope stability with an SF of 1.77, ensuring safety and meeting stability requirements.
Alternative Planning Slope Stabilization on Roadway Case Study : Landslide on Tabone-Polewali Road Section KM 168+790 to 168+820 Istiqamah, Ismi; Khoiri, Mohamad; Maulana, Mahendra Andiek; Razak, Bambang S.
Journal of Infrastructure & Facility Asset Management Vol 7 (2025): Special Issue 2 : Journal of Infrastructure & Facility Asset Management
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/jifam.v7i0.22473

Abstract

The Tabone-Polewali road section is a national road in the West Sulawesi Province that connects the Polewali Mandar Regency and Mamasa Regency. The terrain along this section consists of fairly steep slopes. In 2021, landslides occurred at several points along the Tabone-Polewali road, one of which happened at KM 168+790 to 168+820 during heavy rain. The cause of the landslides is estimated to be water flowing from the upper slope to the lower slope without effective water runoff management. No measures have been taken at this location, making it still hazardous for road users. There are several alternative designs for permanent mitigation, including bored. Slope stability existing analysis was conducted using the Limit Equilibrium Method and Finite Element Method (FEM) for slope reinforcement stability analysis. The results obtained from this study show that the Safety Factor for the existing condition is 1,09. The Safety Factor for the alternative design using bored piles is 1,277 where this has met the minimum safety factor value requirements.
Analysis Of Slope Stability Based On The Effect Of Rainfall On The Lombok International Airport (Bil) - Mandalika Road Sta 10+375 To Sta 10+550 Sudiadnya, Made; Khoiri, Mohamad; Warnana, Dwa Desa; Zulfikar, Herlambang
Journal of Infrastructure & Facility Asset Management Vol 7, No 1 (2025): Journal of Infrastructure & Facility Asset Management
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/jifam.v7i1.22415

Abstract

BIL - Mandalika Bypass Road connects Lombok International Airport (BIL) to Mandalika Special Economic Zone (KEK). This road has a length of 17.3 KM and was completed in 2021. The construction of this section can cut the travel time from 45 minutes to 15 minutes from BIL to the Mandalika area. In early February 2023 when it was raining season, the BIL - Mandalika Bypass Road surface at sta 10+375 s/d 10+550 experienced cracks, and temporary maintenance had been carried out to keep road remain functional. At the end of May 2023, the cracks became worse and there was a decrease of road surface up to 1.2 to 1.8 meters. Based on the soil test report in the field when the landslide occurred, it shows that the groundwater level is 7.5 meters from the road surface. Laboratory test results show that the subgrade is more dominant sandy silt, besides that the 2024 planning report does not include rain parameters on design of slope stability. The purpose of this study is to determine the effect of rain and groundwater level on landslides and subsidence of the BIL - Mandalika STA 10+375 - 10+550 road in 2023. The simulation results of SEEP/W and SLOPE/W showed that the landslide or subsidence was caused by rain, where the slope safety factor before the landslide was 1.197 and decreased to 0.982 after rainfall happen from Januari 2023 to February 2023.
Co-Authors Azhari, A. Istiqamah, Ismi Maulana, Mahendra Andiek Razak, Bambang S. Siagian, Freddy Sudiadnya, Made Warnana, Dwa Desa Zulfikar, Herlambang