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All Journal Rekayasa Sipil Jurnal Teknik Sipil Jurnal Rekayasa Sipil Borneo Engineering : Jurnal Teknik Sipil TEKNIKA Jurnal Teknik Sipil JURNAL REKAYASA Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil SAINSTEK Indonesian Geotechnical Journal
Gofar, Nurly
Universitas Bina Darma
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Journal : Jurnal Teknik Sipil

 1 
PENGARUH PERUBAHAN MUKA AIR BEBAS TERHADAP STABILITAS TANGGUL SUNGAI Agus Feryadi; Nurly Gofar
Jurnal Teknik Sipil Vol 18 No 1 (2022): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v18i1.3933

Abstract

The construction of Levee or river embankment is one method adopted for flood control in Palembang. The stability of the embankment is affected by water seepage inside the embankment due to several factors including rainfall as well as the repeated rise and fall of water surface in the sea due to gravity of moon and sun. Palembang is located 106 km from the east coast of Sumatra, thus the free water surface in Musi river and its tributaries is affected by the sea level. The stability of the levee is affected by the repeated change in the water level which induces changing seepage direction. This paper discusses the stability of levees constructed along Sungai Lacak, one of Musi river tributaries. In this case the stability of the existing levees was evaluated for different conditions of free water level i.e. normal, low tide and high tide. Analysis was also conducted for the case when the levee was constructed following the guidance in Standard Nasional Indonesia (SNI 1724-2015) and Guidelines of Public Work Department (2017). Improvement on the stability was obtained if the embankment was to be rebuilt according to the specification given in the standard. The presence of riprap protects the embankment from the effect of changing seepage direction due to the rise and fall of water level, thus increased the safety factor of the ideal levee during high tide from 1.270 to 2.325.
PENGARUH PERBAIKAN TANAH FONDASI DAN PERKUATAN TERHADAP STABILITAS LERENG TIMBUNAN JALAN DI ATAS TANAH LUNAK Zul Aslam; Nurly Gofar
Jurnal Teknik Sipil Vol 18 No 2 (2022): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v18i2.4613

Abstract

The construction of toll roads in South Sumatra faces two problems. First, most of the road sections are built on soft soil deposits, so the soil must be improved to speed up consolidation process and to improve bearing capacity. Second, the embankment required to reach the design elevation of the toll road is quite high so that reinforcement is needed to improve slope stability. This paper contains the results of a study on the effect of soil improvement using PVD and vacuum pressure, installation of geotextile layers and pile at the toe of embankment slopes, on the stability of the embankment.  The analysis were carried out using data obtained from the construction of the Kayu Agung – Palembang toll road Section 1A, including geometry data, soil stratification, and configuration of PVD installation and soil reinforcement. Slope stability analysis was carried out using the Morgenstern & Price method which is integrated in SLOPE/W program. The results of the analysis show that the safe embankment height for the original soil condition is 3.5 m while the required height of embankment was 6 m. Analysis made for the 6 m high embankment using soil properties after ground improvement with PVD and vacuum pressure shows the FoS is still below 1.5. The presence of geotextile layers and pile improved the performance of the embankment and increased the FoS to 2.410. The slope is still in a safe condition with FoS of 1.762 after the construction of toll road and traffic load which induces a combined load of 35 kPa.
Co-Authors Agus Feryadi Alfrendo Satyanaga Alfrendo Satyanaga arhab Aswin Lim Desmarita Tarjudin Eka Wisnu Sumantri Elpita Aisah Harnedi Maizir Kassim, Khairul Anuar Khairul Anuar Kassim Nofriandi Fitri Andi Saeman Saeman Wahid Sapta Yudha Fardyansah Yudi Harianto Zul Aslam Zul Aslam