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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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Studi Pengaruh Curah Hujan Terhadap Stabilitas Lereng Menggunakan Program Perisi Elpita Aisah; Nurly Gofar
Jurnal Rekayasa Sipil Vol 18, No 2 (2022)
Publisher : Civil Engineering Departement, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrs.18.2.133-147.2022

Abstract

Hujan merupakan salah satu penyebab keruntuhan lereng. Infiltrasi hujan ke dalam tanah dapat meningkatkan kadar air tanah, menurunkan tekanan air pori negatif, dan meningkatkan berat isi tanah atau bahkan menaikkan muka air tanah. Tujuan penelitian ini adalah untuk menganalisis kondisi lereng di sepanjang Jalan Lematang Kota Pagar Alam, meliputi geometri dan kondisi tanah serta menganalisis curah hujan yang dapat mempengaruhi stabilitas lereng. Pengamatan dan analisis stabilitas dilakukan pada enam titik sepanjang jalan tersebut. Pengamatan awal dan pengujian laboratorium menunjukkan bahwa tanah pembentuk lereng adalah lempung dan lanau dengan plastisitas rendah. Sudut kemiringan lereng berkisar antara 27o hingga 39o, dan panjang lereng antara 60 dan 350 m. Analisis stabilitas menggunakan Metode Bischop menunjukkan bahwa secara umum lereng tidak stabil (FOS < 1,5), meskipun secara visual lereng dalam kondisi baik. Oleh karena itu, dipasang rambu peringatan untuk memperingatkan pengguna jalan agar berhati-hati. Dalam studi ini. program PERISI digunakan untuk mengevaluasi apakah hujan dapat mempengaruhi stabilitas lereng di masa yang akan datang. Program ini mengasumsikan panjang lereng tidak terhingga dan dikembangkan berdasarkan konsep tanah tak jenuh. Program ini membutuhkan tiga input yaitu: geometri lereng, IDF yang dihitung berdasarkan curah hujan yang tercatat di stasiun curah hujan Pagar Alam selama 30 tahun (1985 – 2015), dan karakteristik tanah yang diwakili oleh SWCC dan fungsi konduktivitas hidrolik, serta kekuatan geser tanah tak jenuh. Dari analisis menggunakan PERISI dengan hisapan awal -30 kPa didapatkan bahwa lereng dalam kondisi aman. Kondisi ekstrim disimulasikan dengan menerapkan curah hujan dengan durasi 30 hari berdasarkan IDF. Hasil penelitian menunjukkan bahwa terjadi penurunan faktor keamanan yang signifikan pada kedalaman 0 – 5 m. Dengan demikian dapat disimpulkan bahwa berdasarkan IDF curah hujan dengan intensitas 24 mm/hari selama 30 hari tidak menyebabkan terjadinya longsor di Jalan Lematang Kota Pagaralam.
Interpolation method for spatial distribution of clay content within residual soil Alfrendo Satyanaga; Aswin Lim; Nurly Gofar
Indonesian Geotechnical Journal Vol. 1 No. 1 (2022): Vol.1 , No.1, April 2022
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (679.507 KB) | DOI: 10.56144/igj.v1i1.5

Abstract

Residual soil is covering some parts of the tropical country such as Singapore. It is commonly known that residual soil is associated with variability either horizontally or vertically. As a result, it is necessary to have a method to determine the distribution of soil properties to minimize the need to have an excessive amount of boreholes before the commencement of the construction project. This paper presents the suitable interpolation method for the spatial distribution of clay content across Singapore island. The common term related to the spatial distribution of soil properties is called digital soil map. The selection of the best method to generate this map depends on different factors. Therefore, each case requires a thorough evaluation and comparison based on the interpolation results. Singapore's digital elevation model and its boundary were utilized in this study. A digital soil map was developed using ArcGIS software based on two interpolation methods such as ordinary kriging, and the inverse distance weighted method. These two methods were cross-validated and compared based on the regression analysis of the analyses results. Cross-validation was performed to verify the correctness of the mentioned interpolation methods. In order to validate the interpolation results, the mean error and the root mean square error were used. The results suggest that ordinary kriging could be used as a suitable method to generate the spatial distribution of clay content obtained from boreholes in Singapore.
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.
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