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All Journal Rekayasa Sipil Jurnal Teknik Sipil Jurnal Rekayasa Sipil Borneo Engineering : Jurnal Teknik Sipil TEKNIKA 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 Jurnal Teknik Sipil Jurnal Teknik Sipil dan Perencanaan
Gofar, Nurly
Universitas Bina Darma
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Sustainable Retaining Structure Incorporating Recycled Concrete Aggregate Nurly Gofar; Alfrendo Satyanaga
Indonesian Geotechnical Journal Vol. 1 No. 3 (2022): Vol.1 , No.3, December 2022
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3759.532 KB) | DOI: 10.56144/igj.v1i3.32

Abstract

Recycled concrete aggregate, that are easily found from destruction waste materials, has been used in the construction industry as an alternative for coarse aggregate component in concrete or as backfilling material in retaining structure. This paper presents the results of study on the use of the recycled concrete aggregate in the design of a newly developed sustainable retaining wall i.e., Geobarrier system (GBS). The GBS system was developed based on capillary barrier to limit water infiltration into the backfill soil while vegetative cover is used as provisions of the sustainable construction concept. Two types of concrete aggregate are used as components of capillary barrier i.e., fine and coarse aggregate. Laboratory test result shows the recycled concrete has similar mechanical and hydraulic properties as the natural aggregate; thus, can be used as alternative material. Stability and deformation analyses were carried out for 4 m high wall with 70o inclination. Results indicate that the retaining wall meet the requirement of the code of practice according to Eurocode 7 in terms of Factor of safety. Deformation analysis shows that the maximum deformation was only 4.5 mm at the bottom of the GBS wall.
Percepatan Proses Konsolidasi Tanah Lempung Dengan Aplikasi Tekanan Vakum dan Drainase Vertikal arhab; Nurly Gofar
Rekayasa Sipil Vol. 17 No. 3 (2023): Rekayasa Sipil Vol. 17 No. 3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2023.017.03.12

Abstract

This paper presents the performance of PVD and vacuum consolidation as ground improvement method at the construction of Kayu Agung – Palembang Toll Road. The analysis was based on observation data collected between STA 00+000 and STA 09+000. The PVD was installed to a depth where the conus resistance of 80 kPa was achieved. Thus, the length of PVD varies from 5 to 13 m while the actual depth of clay deposit could reach 20 m. As many as 42 settlement plate data were collected and analyzed using Asaoka method to obtain the predicted final settlement, the coefficient of consolidation and the time to reach 90% degree of consolidation. The results were compared with the duration of vacuum consolidation application and the recorded settlement when the vacuum pressure was stopped i.e., when settlement plate recorded no differential settlement in three readings. The duration of vacuum consolidation application generally longer than the t90 predicted by the method and the actual settlement was larger than the predicted final settlement.  This study concluded that the variation of the t90 and the magnitude of settlement at t90 have close relationship with the length of PVD and the condition of the soil layer.
LAPISAN GEOTEKSTIL DAN TURAP TERHADAP DEFORMASI TIMBUNAN JALAN DI ATAS TANAH LUNAK Eka Wisnu Sumantri; Nurly Gofar
TEKNIKA: Jurnal Teknik Vol 10 No 1 (2023)
Publisher : Universitas IBA Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35449/teknika.v10i1.254

Abstract

Makalah ini membahas hasil analisis numerik perubahan bentuk tanggul yang dibangun di atas tanah lunak yang telah distabilkan dengan tekanan vakum dan drainase vertikal menggunakan prefabricated vertical drains (PVDs). Data geometri dan data tanah dikumpulkan dari STA.19+750 Jalan Tol Trans Sumatera. Tanah dasar merupakan lempung lunak hingga kedalaman 20 m. Di atas lapisan tanah lunak terdapat rawa rawa sehingga diperlukan tanggul yang tinggi untuk mencapai elevasi dasar jalan. Peningkatan kekuatan tanah setelah stabilisasi menggunakan tekanan vakum dan PVD dipertimbangkan dalam analisis ini berdasarkan hasil uji sondir sebelum dan sesudah perbaikan tanah. Geotekstil digunakan di dasar timbunan sementara turap dipasang di bawah tepi timbunan untuk membatasi pergeseran lateral timbunan. Hasil analisis numerik menunjukkan bahwa timbunan setinggi 6 m aman terhadap deformasi yang berlebihan serta penyebaran lateral. Bahkan setelah pemberian beban konstruksi dan beban lalu lintas, deformasi maksimum di tengah tanggul hanya 40 mm, sedangkan gaya tarik pada geotekstil adalah 0,11 kN. Keberadaan turap secara efektif mengurangi gaya tarik yang harus ditahan oleh lapisan geotekstil dan memindahkan lokasi gaya tarik maksimum ke arah garis tengah timbunan. Pergeseran maksimum kepala turap setelah pemberian beban konstruksi dan lalulintas adalah 6,35 mm Kata kunci: tanah lunak, timbunan, PVD, geotekstil, turap
CBR Correlation with Index and Compaction Properties of Soil Wahid Sapta; Yudi Harianto; Nurly Gofar
Indonesian Geotechnical Journal Vol. 2 No. 3 (2023): Vol. 2, No. 3, December 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i3.72

Abstract

California Bearing Ratio (CBR) is widely used in the design of roads to indicate the bearing capacity of subgrade as well as each layer of the flexible pavement system. However, the procedure for obtaining the CBR value is often considered complicated and time-consuming, thus; some correlations were developed by previous researchers between the CBR value and index properties such as fine content (w), liquid limit (LL), and plasticity index (PI) of the soil, as well as between the CBR value and compaction properties i.e., optimum moisture content (OMC) and maximum dry density (MDD). This study was conducted to evaluate the applicability of the published correlation on the soil obtained in Palembang and the surrounding areas. In this case, 30 sets of secondary data were collected and selected from past projects. In addition, laboratory tests were conducted on five sets of samples for verification purposes. The laboratory tests include a wet sieve to obtain fine content, Atterberg limits to determine soil’s plasticity, and a standard Proctor test to obtain OMC and MDD. Analysis shows that with modifications, some published correlations could be used to predict unsoaked and soaked CBR values for soils in Palembang. Furthermore, two correlations were developed between the CBR values and compaction properties of the soil based on statistical analysis of the collected data.
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.
Effect of Geogrid Layer on Sand and Clay Soil Deformation Under The Site Foundation Nawawi, Yudith Surya Ambhita; Nurly Gofar
Jurnal Teknik Sipil dan Perencanaan Vol. 27 No. 1 (2025): Jurnal Teknik Sipil dan Perencanaan
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v27i1/10267

Abstract

Two things must be evaluated when planning a shallow foundation: sufficient bearing capacity and non-excessive settlement. In theory, foundation-bearing capacity analysis is based on Terzaghi or Meyerhoff's theory. Terzaghi's theory assumes that the soil under the foundation is uniform to an infinite depth and has sufficient strength to withstand the applied load (Gofar & Kassim, 2007). In reality, the soil beneath the foundation does not always have adequate bearing capacity, which results in excessive settlement (Shahin et al., 2017). Soil replacement using good quality soil is commonly used to improve the bearing capacity of soft soils in a particular location. Many soil improvement methods have been used, including soil compaction, additives, hydraulic methods such as PVD installation, and inclusion methods. Another alternative is to install a layer of geotextile or geogrid under the foundation to increase bearing capacity and reduce deformation. Several studies on improving soil bearing capacity under footing foundations show a significant increase in bearing capacity due to installing geotextile or geogrid layers at a certain distance under the footing foundation. This research uses a numerical method where the analysis is carried out on a hypothetical model with a geometry comparison that matches the laboratory-scale model research conducted by Ambhita (2020).  Numerical analysis was performed using SIGMA/W (Geoslope International, 2018). The results showed that the foundation settlement on the medium clay layer without geogrid reinforcement was more significant than on the sand layer with geogrid reinforcement. Using geogrid layers increases the stiffness of the soil so that the deformation (settlement) is more minor, and the placement pattern of the geogrid layer affects the deformation that occurs. 
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 Nawawi, Yudith Surya Ambhita Nofriandi Fitri Andi Saeman Saeman Wahid Sapta Yudha Fardyansah Yudi Harianto Zul Aslam Zul Aslam