Articles
<![CDATA[Evaluasi Agregat Lokal Sebagai Lapisan Base Perkerasan Permeabel: Evaluation of Local Aggregate as Base Layer of Permeable Pavement ]]>
<![CDATA[Oktariza, Hendra]]>;
<![CDATA[Gofar, Nurly]]>
<![CDATA[ Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil Vol. 12 No. 1 (2023): Cantilever ]]>
Publisher : <![CDATA[Department of Civil Engineering and Planning, Faculty of Engineering, Sriwijaya University ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.35139/cantilever.v12i1.201
<![CDATA[Permeable pavement is a type of road pavement that allows stormwater to infiltrate through the pavement surface and the underlying base layer to reduce surface runoff. Open-graded aggregates are often used as the base layers to temporarily store water and allow the water to infiltrate slowly into the soil below the pavement or through sub-drainage. The strength of open graded material is usually less than the dense-graded materials. Therefore; the mixture of the aggregate for both base and drainage layer need to be designed carefully. In Indonesia, the criteria for aggregate as both base and drainage layer is stipulated in Bina Marga Specification. This study aims at designing an optimum mixture of local aggregate to be used as the base of permeable pavement. The mixture should fulfil the mechanical properties based on laboratory CBR value, and hydraulic properties based on storage capacity and the coefficient of permeability. Five aggregate samples of Andesite origin from South Lampung area were selected for this study. Careful laboratory test procedures were adopted to select configurations of aggregate sizes (design mix formula) that satisfies the requirements both as Aggregate A and as drainage layer. A dense graded aggregate based on the grain size distribution was prepared for design mix formula to meet the requirement as Aggregate A. Then, the fine particles passing No 40 sieve was removed to form open aggregate sample suitable as drainage layer. Both samples were tested for grain size distribution, CBR, permeability and storage capacity. Results show that the local aggregate fulfils the requirements both as base and as drainage layer with average CBR of 92%, average storage capacity of 18.32% and average permeability of 0.05 m/sec. The thickness of the permeable pavement layer could be estimated based on storage capacity and the permeability of the drainage layer.]]>
<![CDATA[Evaluasi Faktor-Faktor Penyebab Longsor dan Kesesuaian Mitigasi: Evaluation of Factors Causing Landslides and Suitability of Mitigation ]]>
<![CDATA[Fathoni, Bulkin]]>;
<![CDATA[Saputra, Erlangga]]>;
<![CDATA[Gofar, Nurly]]>
<![CDATA[ Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil Vol. 13 No. 1 (2024): Cantilever ]]>
Publisher : <![CDATA[Department of Civil Engineering and Planning, Faculty of Engineering, Sriwijaya University ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.35139/cantilever.v13i1.261
<![CDATA[Management and maintenance of slopes require proper knowledge of slope conditions so that appropriate mitigation measures can be implemented. The activities required for the management of slopes include slope inventory, slope inspection, slope risk level assessment, and risk mitigation measures. The objective of this study was to observe the slope conditions and causes of past slope failures, determine the appropriate mitigation measures, and analyze the suitability of landslide mitigation measures and causes of slope failures. The research locations are road segment No. 36 (Kota Lahat – Simpang Air Dingin), No. 37 (Simpang Air Dingin – Pagar Alam), and No. 38 (Pagar Alam – Tanjung Sakti – batas Bengkulu). The research was initiated by analyzing data collected by the South Sumatra National Road Management Agency (BPJNSS) from 2018 to 2021. The field observation was conducted on ten locations where the slope had been repaired after slope failure events. The suitability of mitigation with the factors that cause landslides was analyzed using the slope management system method suggested by the Ministry of PUPR. The results showed that most slope failures were triggered by high-intensity rain falling on slope surfaces containing high humidity due to previous rainfall. The common types of slope mitigation are reducing the forces that cause movement, increasing the resisting forces by controlling seepage, and the use of anchors.]]>
<![CDATA[Optimasi Transportasi Publik: Analisis Kinerja dan Kebutuhan pada Angkutan Umum ]]>
<![CDATA[Gofar, Nurly]]>;
<![CDATA[Sahri, Rahman]]>
<![CDATA[ Borneo Engineering : Jurnal Teknik Sipil Volume 8 Nomor 2 Tahun 2024 ]]>
Publisher : <![CDATA[Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.35334/be.v8i2.5081
<![CDATA[Penelitian ini dilakukan untuk mengevaluasi kinerja pelayanan operasional dan kebutuhan angkutan umum di Sumatera Selatan dengan menggunakan studi kasus pada trayek angkutan umum Bus DAMRI yaitu Palembang – Prabumulih. Tujuan dari penelitian ini adalah untuk mengevaluasi pengoperasian jalur tersebut dalam melayani kebutuhan angkutan umum antara kedua kota dan menyarankan strategi untuk meningkatkan kinerjanya. Statistik kuantitatif deskriptif digunakan untuk menganalisis variabel-variabel seperti faktor muatan, kecepatan perjalanan, waktu tempuh, waktu headway, waktu pelayanan, frekuensi, dan waktu tunggu. Hasil penelitian menunjukkan bahwa layanan bus DAMRI dua kota saat ini dengan 4 armada Palembang – Prabumulih dan 2 armada per hari Prabumulih – Palembang mempunyai tingkat kinerja operasional sedang. Penelitian ini menunjukkan bahwa kinerja optimal dapat dicapai dengan 11 unit armada untuk waktu operasional 11 jam pada rute Palembang – Prabumulih dan 9 unit armada untuk waktu operasional 9 jam per hari pada rute Prabumulih-Palembang.]]>
<![CDATA[Effect of near-surface heterogeneities on the pore-water pressure distribution and slope stability ]]>
<![CDATA[Gofar, Nurly]]>;
<![CDATA[Pangestika, Ega Nanda]]>;
<![CDATA[Harianto, Yudi]]>;
<![CDATA[Gumay, Herdian]]>;
<![CDATA[Satyanaga, Alfrendo]]>
<![CDATA[ SINERGI Vol 28, No 2 (2024) ]]>
Publisher : <![CDATA[Universitas Mercu Buana ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22441/sinergi.2024.2.012
<![CDATA[Seepage and slope stability are important problems analyzed in geotechnical engineering. Conventionally, the analysis is performed in conditions where the soil is intact. However, near-surface soil is subjected to various conditions that lead to heterogeneity, for example, the presence of cracks in clay, relics in weathered rock, and plant roots. The presence of cracks and other forms of heterogeneity on the near-surface layer increases the rainfall infiltration into the slope and changes the pore water pressure distribution accordingly. Water infiltration increases the pore water pressure, raises groundwater level, and decreases the matrix suction of unsaturated soils - which is a critical factor for the stability of slopes. This study aims to evaluate the effect of varying permeability of near-surface soil on the rainwater infiltration to slope and, subsequently, the safety factor. In this case, the near-surface soil is modeled as a layer with higher permeability. Numerical analysis performed in this study using SEEP/W and SLOPE/W indicated that considering this condition results in a higher safety factor of the slope because the higher permeability resulting from heterogeneity helps dissipate pore water pressure, which is critical in maintaining the slope stability during heavy rainfall.]]>
<![CDATA[PENGARUH PENGGANTIAN TANAH DAN LAPISAN GEOTEKSTIL TERHADAP DEFORMASI DAN STABILITAS LERENG TIMBUNAN DI ATAS TANAH LUNAK ]]>
<![CDATA[batara, M]]>;
<![CDATA[Gofar, Nurly]]>
<![CDATA[ JMTS: Jurnal Mitra Teknik Sipil Volume 7, Nomor 3, Agustus 2024 ]]>
Publisher : <![CDATA[Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.24912/jmts.v7i3.29080
<![CDATA[This article discusses the deformation and stability of embankment on soft soil. The analysis was carried out for four conditions. The first condition is 2 m high embankment was placed directly on the original soil, the second condition is that geotextiles are spread under the embankment. In the third condition, the original soil is excavated and replaced with 1 m fill to improve the bearing capacity. The fourth condition is the same as the third condition, but the excavation depth is 2 m. In conditions 3 and 4, geotextiles are spread between the original soil and the replacement soil to avoid mixing the original soil and the fill. A construction load of 15 kPa/m2 was applied to the embankment. Deformation analysis was carried out using SIGMA/W, while for embankment slope stability analysis using SLOPE/W. The analysis results show that the use of geotextiles increases the stability of embankment slopes, while the use of substitute soil provides an increase in the bearing capacity of the base soil and reduces deformation. Abstrak Artikel ini membahas mengenai deformasi tanah dasar akibat beban timbunan jalan serta stabilitas lereng timbunan tersebut. Analysis dilakukan untuk empat kondisi. Kondisi pertama timbunan setinggi 2 m dihamparkan langsung di atas tanah asli, kondisi kedua geotekstil dihamparkan di permukaan tanah asli sebelum timbunan. Pada kondisi ke tiga, dilakukan penggantian tanah se dalam 1 m untuk memperbaiki daya dukung tanah tersebut. Kondisi ke empat sama seperti kondisi ke tiga, namun kedalam galian adalah 2 m. Pada kondisi 3 dan 4, geotekstil dihamparkan di antara tanah asli dan tanah pengganti untuk menghidari tercampurnya tanah asli dan tanah pengganti. Dari keempat kondisi tersebut pada kondisi akhir (tinggi timbunan 2 m) diberikan beban konstruksi sebesar 15 kPa/m2. Analisis deformasi dilakukan menggunakan SIGMA/W sedangkan untuk analisis kestabilan lereng timbunan menggunakan SLOPE/W. Hasil analisis menunjukkan bahwa penggunaan geotekstil meningkatkan kestabilan lereng timbunan, sedangkan penggunaan tanah pengganti memberikan peningkatan pada daya dukung tanah dasar untuk mengurangi deformasi.]]>
<![CDATA[Studi Pengaruh Curah Hujan Terhadap Stabilitas Lereng Menggunakan Program Perisi ]]>
<![CDATA[Aisah, Elpita]]>;
<![CDATA[Gofar, Nurly]]>
<![CDATA[ Jurnal Rekayasa Sipil Vol. 18 No. 2 (2022) ]]>
Publisher : <![CDATA[Civil Engineering Departement, Andalas University ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.25077/jrs.18.2.133-147.2022
<![CDATA[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.]]>
<![CDATA[Identifikasi Skenario Curah Hujan Pemicu Kegagalan Lereng di Pagar Alam dan Sekitarnya ]]>
<![CDATA[Gofar, Nurly]]>;
<![CDATA[Haryanto, Yudi]]>;
<![CDATA[Purnama Sari Dewi, Anggi]]>
<![CDATA[ MEDIA KOMUNIKASI TEKNIK SIPIL Volume 30, Nomor 2, DESEMBER 2024 ]]>
Publisher : <![CDATA[Department of Civil Engineering, Diponegoro University ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.14710/mkts.v30i2.62372
<![CDATA[Pagar Alam and its surrounding area are located in the Bukit Barisan Mountain Rang, thus, the topography is hilly and mountainous. National Road segments passing the area often experience slope failure, which causes distraction to the transportation of people and goods. Past observations showed that slope failures are related to frequent and prolonged rainfall. This paper presents the results of a numerical study on the mechanism of rainfall-induced slope failures in Pagar Alam. The study aimed to identify the critical rainfall scenario triggering slope failures. Data observation indicates that even though wet season started in October, most slope failures occurred between January and April. Thus, initial moisture is required to start the mechanism of failure. The transient pore-water pressure was assessed using SEEP/W while the slope stability was evaluated using Slope/W. The analysis showed that the critical rainfall scenario is a combination of antecedent and major rainfall. The duration of the antecedent rainfall is influenced by the slope angle.]]>
<![CDATA[ANALISIS STABILITAS DINDING PENAHAN TANAH TIPE MECHANICALLY STABILIZED EARTH (MSE) PADA JALAN LAYANG BANTAIAN SUMATERA SELATAN ]]>
<![CDATA[Ansori, Erwin]]>;
<![CDATA[Gofar, Nurly]]>
<![CDATA[ JMTS: Jurnal Mitra Teknik Sipil Volume 8, Nomor 3, Agustus 2025 ]]>
Publisher : <![CDATA[Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.24912/jmts.v8i3.33489
<![CDATA[Mechanically Stabilized Earth (MSE) walls are an effective solution for improving the stability of vertical slope in civil infrastructure projects. This study aims to back-calculate the external and internal stability of MSE walls constructed behind the elevated part of a Flyover Bantaian in Muara Enim Regency, South Sumatra. Subsequently, the optimum design was proposed in terms of the required tensile strength and pull-out resistance of the reinforcement. Analytical and numerical analyses were adopted in this study. The results indicate that the MSE wall is safe against both external and internal failures under both static and seismic loads. The obtained safety factors comply with the SNI 8460-2017 standard. The MSE wall used geogrids with an initial tensile strength (Tu) of 100 kN/m as reinforcement. However, this study suggested that the minimum required tensile strength of the geogrid is 38.79 kN/m. This study contributes to optimizing design and reinforcement material selection to enhance the efficiency and safety of MSE wall structures. Abstrak Dinding penahan Mechanically Stabilized Earth (MSE) merupakan solusi efektif untuk meningkatkan stabilitas timbunan tanah pada proyek infrastruktur sipil. Penelitian ini bertujuan untuk menghitung kembali stabilitas eksternal dan internal dinding MSE yang dibangun di belakang bagian yang ditinggikan pada jalan layang Bantaian di Kabupaten Muara Enim, Sumatera Selatan. Selanjutnya desain optimum diusulkan dalam hal kekuatan tarik dan ketahanan terhadap cabutan (pull-out) bahan perkuatan. Analisis analitis dan numerik diadopsi dalam penelitian ini. Hasilnya menunjukkan bahwa dinding MSE aman terhadap kegagalan eksternal dan internal, baik di bawah beban statis maupun seismik. Faktor keamanan yang diperoleh mematuhi standar SNI 8460-2017. Dalam hal ini, dinding MSE menggunakan geogrid dengan kekuatan Tarik awal (Tu) 100 kN/m sebagai perkuatan. Namun, penelitian ini menunjukkan bahwa geogrid dengan kekuatan tarik minimum 38,79 kN/m cukup untuk digunakan sebagai perkuatan. Penelitian ini berkontribusi untuk optimasi desain dan mengusulkan disain yang lebih optimal dari segi kekuatan tulangan atau geogrid namun tetap menjaga keamanan struktur dinding MSE.]]>
<![CDATA[Water Retention Curve of Soil at Simpang Meo Region South Sumatra ]]>
<![CDATA[Purnamawati]]>;
<![CDATA[Gumay, Herdian]]>;
<![CDATA[Gofar, Nurly]]>
<![CDATA[ Indonesian Geotechnical Journal Vol. 4 No. 2 (2025): Vol. 4, No. 2, August 2025 ]]>
Publisher : <![CDATA[Himpunan Ahli Teknik Tanah Indonesia ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.56144/igj.v4i2.122
<![CDATA[Steep slopes are typically formed on residual soil with deep groundwater levels; hence, the slopes are in the unsaturated zone. Therefore, in analyzing the stability of steep slopes, it is necessary to consider the properties of unsaturated soil. The main property of unsaturated soil is the Water Retention Curve (SWCC), which describes the relationship between matric suction and soil moisture content. Many methods are available to determine the SWCC of a soil, such as laboratory and field tests, as well as empirical equations. Laboratory testing is considered the best method for determining the SWCC. However, the laboratory work involved in the determination of SWCC is tedious; thus, several models have been developed by researchers to obtain SWCC. This study compares SWCC obtained based on the results of laboratory testing using an Osmotic Tensiometer assisted by soil shrinkage measurements using a 3-D scanner, and the SWCC obtained using the empirical equation proposed by Zapata for plastic soil based on the percentage of particles passing the No. 200 sieve and the soil plasticity index. The soil samples were retrieved from a location in the Simpang Meo region in South Sumatra. Air entry value for the SWCC was obtained both graphically and deterministically. Both methods resulted in a lower air entry value (AEV) for the Zapata equation as compared to the osmotic tensiometer test. A lower AEV indicates that lower suction is required for water to enter the soil pores. Therefore, analysis of rainfall infiltration and slope stability using SWCC curves estimated from the Zapata equation could result in later saturation of soil, hence a slightly higher factor of safety]]>
<![CDATA[Analisis Keruntuhan Lereng pada Jalan Muaradua – Kotabatu, Kabupaten OKU Selatan, Sumatra Selatan ]]>
<![CDATA[Haris, Ari Daman]]>;
<![CDATA[Gofar, Nurly]]>
<![CDATA[ Jurnal Teknik Sipil Vol 21 No 2 (2025): Jurnal Teknik Sipil ]]>
Publisher : <![CDATA[Universitas Kristen Maranatha ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.28932/jts.v21i2.9828
<![CDATA[Infrastructure development leads to the cutting of slope dan additional construction loads on crest. Although the impact of slope cutting and additional construction loads on slope stability has been taken into account, several processes that follow, such as increased pore water pressure caused by rainwater seepage and the occurrence of cracks on the ground surface, can trigger slope failure. This article presents a stability analysis of a natural slope that has been cut to make room for the construction of a new road below the existing road. The stability analysis shows that the slope is in a stable condition before (FoS = 1.694) and after the construction (FoS = 1.423). However, the slope collapsed after heavy rain for 3 days on July 20th – 22nd, 2022. The failure plane starts at the crest of the slope, which is in the middle of the existing road, and ends at the toe. Seepage analysis carried out due to rain infiltration by considering the position of the crack as the starting point of the landslide plane, shows that there is an increase in pore water pressure in the slope, and the FoS decreases to 0.973. Remedial work carried out after a failure includes realigning the existing road, strengthening the toe of the slope with a retaining structure, covering the slope surface with vegetation, and arranging surface drainage.]]>
