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All Journal Jurnal Ilmiah Rekayasa Sipil Construction and Material Journal Mitra Akademia: Jurnal Pengabdian Masyarakat Jurnal Warta Desa (JWD)
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Politeknik Negeri Jakarta
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Journal : Jurnal Ilmiah Rekayasa Sipil

 1 
Analisis Stabilitas Lereng Dengan Perkuatan Geotekstil (Studi Kasus: Proyek Pembangunan Jalan Tol Cibitung - Cilincing Seksi 2 STA 6+475) Pandu Graha Rizqullah; Yelvi Yelvi
Jurnal Ilmiah Rekayasa Sipil Vol 19 No 2 (2022): Oktober 2022
Publisher : Pusat Penelitian dan Pengembangan Masyarakat (P3M), Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jirs.v19i2.836

Abstract

Excavation and embankment work on toll roads is a routine work due to the difference of elevation between road and ground existing. This paper This paper will discuss slope stability during earth works at Cibitung - Cilincing Toll Road Project since there are a lot of excavation and embankment works. The slope stability has to be analyzed to determine safety factor (SF). On this paper, embankment slope at STA 6+475 is reinforced by geotextile system. The safety factor is calculated using before and after reinforced by geotextile using Bishop method and PLAXIS software program. The results shows that a safety factor of 1.47 (manually) and 1.201 (PLAXIS) in static condition. For dynamic condition with coefficient of horizontal earthquake of 0,18 is obtained average of safety factor of 0.95 (manually). While the safety factor for analysis with earthquake loads using PLAXIS software program cannot be calculated, then the lateral deformation value is sought, which is 0,505 m. From this result, the slope of existing condition has to be reinforced by geotextile system since SF is less than 1.25. Reinforcement of geotextile system designed is divided into 2 zones, such as: 1.0 m and 0.5 m. Analysis of slope stability of the embankment slopes with geotextile reinforcement system is obtained a safety factor of 1.880. It means that the condition of the existing embankment slopes reachs 64%. While the value of the lateral deformationnof the embankment slope using geotextile renforcement with an earthquake load is 0,034 m, so that this value meets the allowable deformation value.
Penerapan Soil Preloading, PVD, dan PHD untuk Analisis Penurunan Konsolidasi Tanah Citra Kusuma Andini; Yelvi Yelvi; Azmi Lisani Wahyu; Handi Sudardja; Merley Misriani
Jurnal Ilmiah Rekayasa Sipil Vol 20 No 2 (2023): Oktober 2023
Publisher : Pusat Penelitian dan Pengembangan Masyarakat (P3M), Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jirs.v20i2.1158

Abstract

Soft clay has a low bearing capacity, high compressibility and low permeability. This condition causes soft clay soil to have a long settlement time. To overcome this soft soil condition, soil improvement methods are needed. One of the efforts is to use a combination of soil preloading methods, Prefabricated Vertical Drain (PVD), and Prefabricated Horizontal Drain (PHD) methods. Calculating soil settlement with soil improvement is carried out using the Asaoka method, which is a field observation method, and the theoretical method using the Terzaghi method. Based on the calculation results of field observations using the Asaoka method, the average degree of soil settlement is 93.5%. The calculation results of the Asaoka method are recalculated using a back calculation to produce a new parameter value, namely the horizontal consolidation (Ch) value, which is then compared with the Ch value in the previous plan. In the Terzaghi method, the average soil settlement value is 1.205 meters. The results of soil settlement value are used to analyze the height of the embankment based on the load ratio requirement in SNI 8460: 2017, where the load ratio on the ground is ≥ 1.3 times the planned load under service conditions. Based on the monitoring results, a load ratio value of 0.875 was obtained so that the SNI requirements carried out a re-planning of the landfill. Then, proceed with the design of PVD and PHD. The results obtained in planning use triangular PVD patterns with a distance between PVDs of 1 meter.
Co-Authors Aisyah Salimah Arliandy Pratama Arbad Azmi Lisani Wahyu Citra Kusuma Andini Handi Sudardja Istiatun Istiatun Muchsin Farid Habibie Pandu Graha Rizqullah Putera Agung Maha Agung Rizal, Rikki Sofyan