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Optimasi Perancangan Timbunan Sampah Perkotaan Studi Kasus TPA Kabinuang Tolitoli Nasril, Moh; Rifai, Ahmad; Faris, Fikri
Semesta Teknika Vol 23, No 1 (2020): MEI 2020
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Pertambahan populasi penduduk khususnya daerah pemukiman kota meningkatkan jumlah sampah padat perkotaan. Sistem pengolahan timbunan sampah pada tempat pembuangan akhir (TPA) kurang efisien sehingga melebihi kapasitas. Berbagai cara diperlukan untuk memaksimalkan kapasitas tempat pembuangan. Lokasi penelitian ini terletak di TPA Kabinuang, Kabupaten Tolitoli. Dalam penelitian ini dilakukan pengambilan sampel di lapangan secara Test Pit di kedalaman 1-2 m pada 3 titik pengamatan mewakili sampel sampah lama (SL), sampah berumur sedang (SS) dan sampah baru (SB) juga sampel tanah dasar (TD) dan tanah penutup (TP). Sampel kemudian diuji kadar organik, kadar air, spesific gravity dan uji triaxial. Data laboratorium kemudian dianalisis dan dilakukan pemodelan dengan variasi lapisan timbunan sampah khususnya pada sampah baru dengan penambahan lapisan tanah penutup. Digunakan program Rocscience (finite element) dan Slide (limit equilibrium) 2 dimensi untuk mendapatkan nilai angka aman dan displacement lereng timbunan sampah pada TPA Kabinuang. Hasil analisis 2D stabilitas lereng timbunan sampah memiliki optimasi desain dengan peningkatan kapasitas timbunan setinggi maksimal 10 m dari kondisi awal dan kemiringan lereng 450 tanpa menggunakan lapisan tanah penutup menghasilkan displacement 0,31 m dan angka aman kondisi statis 3,03 dan 1,16 kondisi dinamis. Apabila digunakan lapisan tanah penutup, kestabilan lereng timbunan sampah meningkat, ditunjukkan displacement yang terjadi lebih kecil yaitu 0,18 m dan angka aman 2,61 kondisi statis dan 1,11 kondisi dinamis.Â Â The increase in the population, especially urban settlements increases the amount of municipal solid waste. The processing system of waste embankment at the landfill (TPA) is less efficient so that it exceeds capacity. Various ways are needed to maximize landfill capacity. The location of this study is located in the TPA Kabinuang, Tolitoli Regency. In this research, the Test Pit was taken in the field at a depth of 0,5-1 m at 3 observation points representing samples of old waste (SL), medium aged waste (SS) and new waste (SB) as well as subgrade samples (TD) and soil cover (TP). The samples were then tested for organic content, water content, Specific Gravity and Triaxial test. Laboratory data are then analyzed and modeling with variations in layers of landfill, especially in new waste with the addition of overburden. 2-dimensional Rocscience (limit equilibrium) and Slides (equilibrium) programs were used to obtain the safe and displacement value of the landfill slope at the Kabinuang landfill. 2D analysis of slope landfill stability has optimized the design with an increase in embankment capacity as high as a maximum of 10 m from the initial condition and slope of 450 without using soil cover resulting in a displacement of 0,31 m and a safety factor of static conditions 3,03 and 1,16 dynamic conditions. If the soil coverÂ is used, the slofe stability of the landfill increases, indicating that the displacement is smaller, which is 0,18 m and the safety factor is 2,61 static conditions and 1,11 dynamic conditions.

3D Back Analysis of Karyamekar Landslide, West Java, Indonesia: Effects of Tension Crack and Rainfall on Peak and Residual Soil Shear Strength Aisya Galuh Laksita; Faris, Fikri; Ahmad Rifa’i
Journal of the Civil Engineering Forum Vol. 10 No. 1 (January 2024)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.7837

A landslide was experienced in Karyamekar Village, Cilawu District, Garut Regency, West Java, on 12 February 2021 at approximately 300 m length with a depth of 20 m, leading to a steep slope. Therefore, this study aimed to use 3D back analysis to determine soil shear strength to be subsequently applied in analyzing the possibility of further landslide with due consideration for tension crack and rainfall effect. It was also used to understand the influence of these factors on slope stability. Filled tension crack and rainfall effects were modeled using Finite Element Method (FEM) while Limit Equilibrium Method (LEM) was applied for back analysis. The results of back analysis showed that peak shear strength value of φ was 31.18° at a cohesion of 8.01 kPa while the residual shear strength value of φ was 10.35° with 2.31 kPa. The φpeak value was found to be close to the estimated 32°, but there was a significant difference in the φresidual which was approximated to be 30°. This discrepancy could be attributed to several factors such as the accuracy of rainfall data and geometry as well as the absence of some soil samples during the investigation. The cohesion values for peak and residual soil shear strength were considered acceptable because of the smaller values compared to the typical cohesion of SM (Silty Sand) which was set at 20°. Moreover, slope stability analyses conducted using only the effect of tension crack produced a safety factor of 0.996 while those with only the effect of rainfall had 1.172. The results showed that water pressure in tension crack had a more significant influence on slope stability compared to rain. However, it was important to state that the variation in the significance of each factor was based on the assumptions made during the analysis.

Seismic Hazard Assessment in Maluku Province Using PSHA Setiawan, Yoga; Fathani, Teuku Faisal; Faris, Fikri
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 19 No. 2 (2023): December
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v19i2.66790

On 10 January 2023, a strong earthquake with a moment magnitude (Mw) of 7.5 occurred in Banda Sea, Maluku Province. This earthquake caused casualties around the epicentre due to the building collapse which was not an earthquake-resistant structure. A high level of seismic vulnerability and non-standard infrastructure often result in large losses when earthquakes occur. Therefore, mapping of earthquake-prone areas needs to be carried out to optimize the mitigation efforts based on Peak Ground Acceleration (PGA) and Spectrum Acceleration (SA) values. In this paper, mitigation efforts are carried out by mapping earthquake-prone areas using Probabilistic Seismic Hazard Analysis (PSHA) which considers the potential of each complex earthquake source in Maluku Province. Input data was obtained from several earthquake catalogues such as Advanced National Seismic System (ANSS), International Seismological Center (ISC), and United States Geological Survey (USGS) which were processed and analyzed using the Matlab, ZMap, and R-CRISIS programs and mapped using the ArcMap program. The results of PSHA show that Maluku Province is a region with varying levels of earthquake vulnerability. The research results show that the distribution hazard value on PGA in Maluku Province reaches 0.02g to 0.48g for a return period of 500 years and 0.04g to 0.79g for a return period of 2,500 years and on SA for periods of 0.20 seconds and 1.00 second reaches 0.04g to 0.89g and 0.01g to 0.22g for a return period of 500 years and 0.07g to 1.48g and 0.02g to 0.35g for a return period of 2,500 years, respectively. The highest level of vulnerability is in the northern region including Seram Island, Way Apu Island and Ambon Island and the lowest level of vulnerability is in the eastern region including Aru Island.

Comparison of Field Ultimate Capacity (Static and Dynamic Load Test) with the Analytic Design of Bored Pile in Granular Soil, Batam, Indonesia Kurniadhi, Rizki; Hardiyatmo, Hary Christady; Faris, Fikri
Jurnal Teknik Sipil dan Perencanaan Vol 25, No 2 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v25i2.45485

A bored pile provides a large capacity obtained to toe and friction pile to support some loads such as axial, lateral, and tensile due to hydrostatic pressure or overturning moment. Static and dynamic load tests are often carried out to validate pile design before pile production in a project. This study aims to compare the ultimate capacity of the pile based on the result of static load test, dynamic load test, and pile design in granular soil of Batam, Indonesia, in which Chin-Kondner, Mazurkiewicz, Davisson, and Hansen 80% methods are utilized to obtain ultimate capacity (Qu) of static load test and dynamic test analysis apply Case Pile Wave Analysis Program (CAPWAP) method to gain ultimate capacity. The result analysis of the static load test of ultimate capacity using Chin-Kondner, Mazurkiewicz, Davisson, and Hansen 80% methods obtained results of 1379, 1300, 1375, and 1182 tons, respectively, with a Qu average of 1309 tons. A bearing capacity (RMX) of 1204 tons was obtained through a dynamic load test. Using the CAPWAP method based on the dynamic test, the ultimate bearing capacity (Ru) of 1248 tons was obtained. Analysis of pile design shows that the ultimate capacity of the bored pile in the granular soil of Batam, Indonesia, was 1157 tons. The Qu examination between field loading testing (1278.5 tons) and design pile foundation (1158 tons) was 9.4%.

Pemanfaatan Limbah Plastik Jenis PET (Polyethylene Terephthalate) sebagai Bahan Stabilisasi Lereng Timbunan Kurniawan, Danang; Faris, Fikri; Fathani, Teuku Faisal
Borneo Engineering : Jurnal Teknik Sipil Volume 8 Nomor 2 Tahun 2024
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v8i2.5400

Plastik merupakan material polimer sintetik yang telah banyak digunakan disemua lapisan masyarakat. Salah satu jenis limbah plastik yang banyak digunakan yaitu jenis PET (polyethlene terephthalate). PET merupakan jenis plastik yang hanya dapat digunakan untuk satu kali pemakaian, maka akan menimbulkan permasalahan terhadap limbah yang dihasilkan. Oleh karena itu dilakukan suatu upaya untuk memanfaatkan limbah plastik jenis PET dengan cara merangkainya menyerupai bentuk geocell yang berfungsi sebagai bahan perkuatan pada lereng timbunan. Pada penelitian ini menggunakan tiga jenis ukuran botol air mineral yaitu 330 ml, 600 ml dan 1500 ml. Tujuan pada penelitian ini adalah untuk mengetahui pengaruh penggunaan geocell limbah PET yang digunakan sebagai bahan perkuatan pada lereng timbunan. Metode yang digunakan dalam perhitungan yaitu menggunakan program Plaxis 2D. Hasil dari penelitian ini yaitu penggunaan perkuatan geocell limbah PET pada lereng timbunan dapat meningkatkan nilai angka aman dan mengurangi nilai displacement. Peningkatan angka aman terbesar dan pengurangan nilai displacement terbesar terjadi pada perkuatan geocell limbah PET 1500 ml. Pada pemodelan parametrik, peningkatan nilai angka aman mencapai 1,383 dan pada pemodelan studi kasus peningkatan nilai angka aman mencapai 1,343. Penurunan nilai horizontal displacement dan vertical displacement pada pemodelan parametrik secara berurutan mencapai 32,51% dan 40,08%, sedangkan penurunan nilai horizontal displacement dan nilai vertical displacement pada pemodelan studi kasus secara berurutan mencapai 44,26% dan 10,13%.

Effect of Parametric Soil Nailing under Seismic Behavior Ramayanti, Anggie; Faris, Fikri; Hardiyatmo, Hary Christady
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 20 No. 2 (2024): December
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v20i2.74144

The Wonogiri region has hilly contours that make the area vulnerable to slope failure. Treatment of slope failure can be done by several methods, such as geometry changes, controlling drainage and creating structures for stability such as soil nailing. Soil nailing has proven useful as a slope reinforcement with several advantages such as low cost and fast implementation. This study aims to see the effect of the parametric behavior of soil nailing on the displacement and axial force of the nail bar under earthquake conditions. First, soil nails are modeled in the finite element method with variations in length, horizontal distance, and vertical distance between nails by applying pseudo-static load based on the history of the largest earthquake that have occurred at the research location, then displacement and axial forces on the nail bar are checked. The modeling shown that increasing the length increases the safety factor, reduces the displacement of the soil nailing wall, and reduces the axial force on the nail bar, as it increases the length of the nail behind the landslide plane and increases the friction between the nail and the soil which resists excessive displacement of the soil surface. Meanwhile, increasing the horizontal and vertical spacing reduces the safety factor, increases the displacement of the soil nailing wall, and reduces the axial force on the nail bar, due to the increased friction between the nail and the soil. Vertical nail spacing variation has more effect on safety factor, displacement, and axial force than horizontal nail spacing variation.

Slope Stability Analysis Using Electrical Resistivity Tomography and Limit Equilibrium Method: A Case Study from Girimulyo, Kulon Progo Santie, Putri Anjary Widya; Wilopo, Wahyu; Faris, Fikri
Journal of Applied Geology Vol 9, No 1 (2024)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.97467

Girimulyo sub-district is one of the areas with high landslide risk in Kulon Progo Regency. On March 12, 2018, a landslide occurred in the area. Seven families were affected, and landslide material blocked the road. This study aims to determine slope conditions through electrical resistivity tomography (ERT) and slope stability analysis using the limit equilibrium method. Based on the interpretation of the ERT profile, it is known that a layer with a resistivity value of <5 Ωm is wet clay; 5-15 Ωm is wet silt; 15-150 Ωm is silt-to-sand; and >150 Ωm is bedrock. The sliding surface is thought to be at the boundary between the wet clay and wet silt layers. The interpretation of the ERT profile is confirmed by data from laboratory tests on soil samples. Slope stability analysis was carried out using ERT profile interpretation and soil sample laboratory test data. The slope stability analysis results show that both the slopes that experienced landslides in 2018 and those that did not experience landslides were stable when the water table was 3 meters deep. However, the landslide slopes are in critical condition as the groundwater level rises, while the non-landslide slopes are remains stable.

Landslide Susceptibility Assessment Using Combined TRIGRS and Flow-R Rifa’i, Ahmad; Yuniawan, Ragil A.; Faris, Fikri; Trisnawati, Tiara R.; Purba, Byon Rezy Pradana; Subiyantoro, Andy; Suryana, Eka Priangga Hari; Ridwan, Banata Wahid
Civil Engineering Journal Vol 11, No 3 (2025): March
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-03-020

Landslides were addressed as one of the natural hazards that can create extensive disasters. Effective assessment to locate potential landslide events is crucial for planning and risk mitigation. This study, which is located in the Sumitro watershed, Kulon Progo, Yogyakarta, presents a novel approach to landslide susceptibility assessment by integrating the Transient Rainfall Infiltration and Grid-Based Regional Slope-Stability Model (TRIGRS) with the Flow-R model. Five key parameters, namely slope, soil properties, groundwater level, soil thickness, and rainfall, were used to create the landslide susceptibility zonation. TRIGRS was used to identify the landslide initiation, while Flow-R was used to create the run-out area. The result was then validated through statistical evaluation using Area Under Curve (AUC) based on the landslide inventory. Results show that landslide susceptibility zonation created from TRIGRS alone resulted in an AUC value of 0.679, while the combination of TRIGRS-Flow-R susceptibility zonation shows a better AUC value of 0.728. The increase of the AUC value of almost 0.05 has enhanced the correlation between the landslide susceptibility zonation and landslide inventory from “acceptable” to “excellent” correlation. This result demonstrates that integrating Flow-R with TRIGRS improves the performance of landslide susceptibility zonation. This study offers a new perspective on creating landslide susceptibility zonation by combining two methods, yielding more reliable results. Doi: 10.28991/CEJ-2025-011-03-020 Full Text: PDF

Enhancing Soil Liquefaction Prediction: Overcoming Data Challenges in SPT-Based Machine Learning with Imputation Technique Fadliansyah, Fandi; Faris, Fikri; Wilopo, Wahyu; Ardiansyah
Journal of the Civil Engineering Forum Vol. 12 No. 1 (January 2026)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.21347

In addition to the adverse effects of earthquakes, the loss of soil-bearing capacity during liquefaction can exacerbate damage to buildings. Liquefaction phenomena involve many parameters, making it more complex to evaluate. Machine learning has been studied to deal with liquefaction complexity in recent decades. However, incomplete liquefaction data can result in missing information, complicating model development across various datasets. Therefore, this study aims to assess the capability of machine learning models to predict liquefaction by implementing the missing value imputation technique. Seismicity, soil properties, and soil condition parameters were utilized to develop models. Random Forest (RF), k-Nearest Neighbor (k-NN), and eXtreme Gradient Boosting (XGBoost) were trained by applying feature selection and parameter optimization based on standard penetration test (SPT) data. The confusion matrix was used to assess the performance of the model based on the performance matrix of Overall Accuracy (OA), Precision (Prec), Recall (Rec), F1-Score (F1), and Area Under the Curve (AUC). In addition, the preprocessing stage included data normalization and outlier treatment to enhance the reliability of model predictions, ensuring consistent learning behavior across different variable scales. The results show that the RF achieved the highest performance (OA = 90.71%), which is comparable to findings from other previous studies. The AUC results indicate that the models deliver excellent classification performance. These findings suggest that the integration of imputation and preprocessing techniques can significantly improve data-driven approaches in geotechnical earthquake engineering. In conclusion, the missing imputation is quite effective in the predictive model. Finally, this study offers a new perspective on developing machine learning models using a more user-friendly software and applying imputation techniques to handle missing data.

PERFORMANCE ANALYSIS OF STEEL PILES ON EXISTING BERTHING DOLPHIN STRUCTURE Yus, Bella Esfadiary; Fathani, Faisal; Faris, Fikri
JURNAL TEKNIK SIPIL Vol 14, No 2 (2025): Volume 14 Nomor 2 November 2025
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jts.v14i2.45877

East Kalimantan Province, located on Indonesias largest coal-exporting island, relies heavily on the Mahakam River as a major water transportation route. In a jetty construction project along a tributary of the Mahakam River in East Kalimantan, modifications were made to the structure from the original design, presumably contributing to the dolphin structure's displacement. Soil test data indicate predominantly clayey soil, with hard layers at approximately 20 m depth. This study aims to evaluate the structural strength of the initial design and the existing condition through manual calculations and SAP2000 analysis. Manual calculations utilize N-SPT values, while SAP2000 models soil as a spring element based on the Nakazawa Method. The study evaluates the existing dolphin structure using numerical modelling and manual calculations, showing an increase in vertical capacity from 231.17kN to 302.82 kN and a reduction in displacement from 43.3mm to 23.3mm. Despite depth modifications from the original design, the berthing dolphin structure remains structurally safe for its intended function.East Kalimantan Province, located on Indonesias largest coal-exporting island, relies heavily on the Mahakam River as a major water transportation route. In a jetty construction project along a tributary of the Mahakam River in East Kalimantan, modifications were made to the structure from the original design, presumably contributing to the dolphin structure's displacement. Soil test data indicate predominantly clayey soil, with hard layers at approximately 20 m depth. This study aims to evaluate the structural strength of the initial design and the existing condition through manual calculations and SAP2000 analysis. Manual calculations utilize N-SPT values, while SAP2000 models soil as a spring element based on the Nakazawa Method. The study evaluates the existing dolphin structure using numerical modelling and manual calculations, showing an increase in vertical capacity from 231.17kN to 302.82 kN and a reduction in displacement from 43.3mm to 23.3mm. Despite depth modifications from the original design, the berthing dolphin structure remains structurally safe for its intended function.

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