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Mochtar, Noor Endah
Civil Engineering Department, Sepuluh Nopember Institute of Technology
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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Handling Selection of Settlement and Embankment Stability Issues Based on Variations in Embankment Height and Soft Subgrade Thickness Case Study: Pekanbaru Junction - Pekanbaru Bypass Sta. 176+775 - Sta. 176+975 Hermawan, Pandu; Mochtar, Noor Endah; Mochtar, Indrasurya B.; Muliawan, Mahar
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.v7i0.22471

Abstract

Trans Sumatra Toll Road (JTTS) is one of the most important infrastructure projects in Indonesia. One of the main sections of JTTS is the Rengat - Pekanbaru Toll Road, Pekanbaru Ring Section (Pekanbaru Junction - Pekanbaru Bypass). Existing conditions at Sta 176+775 - Sta 176+975 are dominated by oil palm plantations with soft soil layers in the form of organic soil to a depth of 1.0 meter; the layer below is clay with medium to stiff consistency. The existing treatment plan is preloading embankment with PVD and 1,0 m deep subgrade replacement. In this study, alternative planning calculations were carried out with variations of subgrade replacement up to 0.5 m and 1,0 m thickness. The study results show that the most cost-optimal treatment design is the treatment design without replacement with geotextile reinforcement. The thicker the subgrade replacement, the smaller the compression and rate of settlement. In terms of embankment reinforcement, the thicker the subgrade replacement, the less reinforcement is required. The thickness of subgrade replacement also affects the cost of the work, the thicker the subgrade replacement, the higher the cost of the work.
Slope Design for Cost Optimization of Slope Cutting and Reinforcement (Case Study: Trans-Sumatra Toll Road Rengat Pekanbaru Section Lingkar Pekanbaru Junction Pekanbaru Sta. 205+150 - 205+725) Prasetiyo, R Fiansyah Dwi; Mochtar, Noor Endah; Mochtar, Indra Surya B; Muliawan, Mahar
Journal of Infrastructure & Facility Asset Management Vol 7 (2025): Special Issue 1 : 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.v7i0.22445

Abstract

The trans-Sumatra toll road project currently under construction is the Rengat - Pekanbaru toll road construction project, the Pekanbaru ring road section located at km 205 + 150 to km 205 + 725 (575m long). In this section, quite deep excavation work is required as well as quite wide land acquisition which causes expensive land acquisition costs. In this study, slope variations were carried out with steeper angles in order to obtain a smaller road ROW; only additional reinforcement needs to be planned so that the slope is more stable and does not cause landslides. The stability of the varying slope slopes was analyzed using an auxiliary program to obtain the safety factor for each selected slope. In conducting the analysis, the elevation of the groundwater level was varied, namely at the bottom of the excavation (conditions during the dry season), as in secondary data, and at the top of the excavation (conditions during maximum rainfall). Slope stability analysis was also carried out using the ' theory of cracked soil' approach. Slope reinforcement using ground anchors will be planned if SF <1.0; for slopes that have SF ≥ 1.0, rainwater management will be carried out without reinforcement. The excavation slope at Sta 205+400 with a slope of 1:2 and 1:3 and the groundwater level at the top of the excavation is SF = 1.73; if the analysis is carried out using the cracked soil approach, the safety factor value drops to SF = 0.68. In addition, in the alternative slope gradients, namely alternative 1 with a slope angle of 1:1 and alternative 2 with a slope angle of 2:1, the slope safety factor changes quite drastically to 0.39 in alternative 1 and 0.2 in alternative 2. The cost calculation for alternative 2 with a slope gradient of 2:1 saves excavation work of 183,136.31 m3, 34,375 m2 of land acquisition and reinforcement costs of 3,422 Ground anchor points in cracked soil conditions and groundwater elevation with existing conditions of secondary data. Cost optimization of Rp. 18,423,905,547,-
Co-Authors Hermawan, Pandu Mochtar, Indra Surya B Mochtar, Indrasurya B. Muliawan, Mahar Muliawan, Mahar Prasetiyo, R Fiansyah Dwi