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All Journal International Conference on Coastal and Delta Areas Journal of Advanced Civil and Environmental Engineering Neo Teknika: Jurnal Ilmiah Teknologi Jurnal Civil Engineering Study Scripta Technica: Journal of Engineering and Applied Technology
Lisa Fitriyana
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Other

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 1 
Increase the Strenght of Base and Subbase of Flexible Pavement by adding Fledspar as additive material Gatot Rusbintardjo; Lisa Fitriyana; Nur Izzi M. Yusoff; Arafat Suleiman Yero
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 2, No 2 (2019): October
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.2.2.59-64

Abstract

The strength and durability of the flexible pavement is highly dependent on the quality of the aggregate material used for base and subbase layers. This is can be understand since  95 percent of the weight-volume of the base and subbase layer is aggregate. Therefore using a good quality and strong base and subbase material is very important. In this paper, which is a report of a reseacrh,  Feldspar is used as stabilizer of base and subbase materlias of flexible pavement. Feldspar  is a group rock-ftant forming tectosilicate minerals that made up about 41% of the earth’s continental crust by weight. 5 to 25% of Feldspar with increment of 5% by weight of the base and also subbase were added. Direct Shear and California Baring Ratio (CBR) test were conducted., beside water content and dry density test. The results of direct shear  test show that cohesion of base and subbase materials decrease from 0,164 kg/cm2 of original base and subbase materials become 0,01 kg/cm2 for base and subbase material after adding with 25% of Feldspar, and angle of inernal friction increase from 47,670 become 49,800. Meanwhile the results of CBR test show that CBR value of base increase from 30% to 86,40%, as well as for subbase increase from 21,50% to 87,30% after adding with 15% of Feldspar. It can be concluded that adding aggregate of base and subbase with Feldspar the strenght improve signicantly, and the influence is the strengthening of the base and subbase layers.
Perkuatan Turap Baja Terhadap Gaya Lateral Berlebih Pada Galian Tanah Lunak Widayat Amariansah; Antonius Antonius; Lisa Fitriyana; Moch Dony Febriansyah
Neo Teknika Vol 7, No 1 (2021): Jurnal Neo Teknika Volume 7 Nomor 1 Juni 2021
Publisher : Universitas Pandanaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37760/neoteknika.v7i1.1832

Abstract

Galian konstruksi bangunan pada tanah lunak di daerah pantai Tambak Lorok Semarang memerlukan turap penahan tanah agar tidak longsor. Turap dari baja dibuat stabil terhadap gaya lateral, momen, gaya dalam dan potensi terangkatnya permukaan tanah dasar galian. Jika timbul tekanan tanah lateral yang berlebih di belakang turap, muka air tanah yang tinggi, pengurangan tekanan tanah pasif akibat pengerukan, perubahan kedalaman galian dan pemasangan turap yang tidak mengunci satu dengan lainnya, maka turap dapat mengalami deformasi lateral. Oleh sebab itu diperlukan perkuatan struktur turap secara struktural yaitu balok pengaku horisontal (strut) dan penopang (rakes)serta perkuatan non struktural yaitu metode penggalian secara bertahap yang diikuti pengecoran struktur dari dasar galian secara segmental. Cara ini cukup efektif menstabilkan tanah lunak di sekeliling galian sampai pengecoran struktur bawah bangunan selesai dikerjakan. Kata kunci : Perkuatan, turap baja, gaya lateral, tanah lunak
Assessment of Geotechnical Feasibility in Development of STIE BPD Semarang Lisa Fitriyana
International Conference on Coastal and Delta Areas Vol 3 (2017): The 3rd International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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

Abstract

Geotechnical studies are an early stage for planning an infrastructure. In general, the geotechnical parameter value of a region is determined by soil characteristics. To know the condition of the soil layer under the structure, it is necessary geotechnical investigation. Toptografi uneven shape and the value of the low bearing capacity causes the need for planning the reinforcement. The reinforcement used is soil nailing and retaining wall. In this feasibility test used analysis of soil bearing capacity with plaxis program. The results of the analysis show that the reinforcement at the construction site of STIE BPD raises the value of its Savety Factor reaching 5.83.  Keywords: Geotechnical investigation, soils bearing capacity, reinforcement.
Analisis Stabilitas Pondasi Terhadap Rembesan Dan Piping Pada Bendungan (Studi Kasus Bendungan Jragung Kabupaten Semarang) Riko Bagus Setiyawan; Rekhan Farras Sutrisno; Abdul Rochim; Lisa Fitriyana; Ahmad Hidayawan
Jurnal Civil Engineering Study Vol. 5 No. 02 (2025): Jurnal Civil Engineering Study
Publisher : Civil Engineering of Universitas Islam Nahdlatul Ulama Jepara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34001/ces.v5i02.1545

Abstract

The dam foundation is a basic structure that meets the requirements as a supporting sector for dam construction and ensures safety against one of the serious threats in the form of seepage and Piping. Therefore, analyzing the stability of the dam foundation against seepage and Piping is necessary. This study uses the Finite Element program to analyze stability, seepage, and Piping under Normal Water Level conditions. Dam stability analysis is carried out by adding earthquake load coefficient factors OBE (Operating Basis Earthquake) and MDE (Maximum Design Earthquake). The analysis is carried out in two stages, namely the first stage without additional repairs and the second stage with additional repairs in the form of Curtain Grouting and Cut-off wall. Under Normal Water Level conditions without earthquakes or with OBE and MDE 1.00H earthquakes, the stability of the foundation in Existing conditions, Alternative 1, and Alternative 2 meets the criteria, but does not meet the MDE 0.25H, 0.50H, and 0.75H earthquakes so that dynamic analysis is required using the Makdisi-Seed method. Seepage analysis shows that the discharge in the Existing condition is 49,716.74 m³/day exceeding the permit limit of 45,000 m³/day, while Alternative 1 (255.13 m³/day) and Alternative 2 (238.55 m³/day) meet the criteria. Meanwhile, Piping analysis in Normal Water Level conditions shows that the Existing does not meet the Safety Factor, while Alternative 1 and Alternative 2 meet the criteria and are safe for Piping.
Stabilisasi Tanah Lunak Menggunakan Campuran Ferronickle Slag dan Alkali Soma Shaki Hadi Nugraha; Dzulfikar Sani; Lisa Fitriyana; Juny Andry Sulistyo
Journal of Engineering and Applied Technology Vol 2 No 1 (2026): : June: Scripta Technica: Journal of Engineering and Applied Technology
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/vrm3vy68

Abstract

The Kendal Industrial Park (KIK), Central Java, is characterized by soft clay soil with low bearing capacity, requiring improvement before being used as a construction foundation. This study aims to determine soil classification, analyze the effect of ferronickel slag and alkali (NaOH and KOH) mixtures, and evaluate the potential of these mixtures as soil stabilization materials. The research was conducted experimentally in the laboratory through specific gravity tests, grain size distribution analysis, Atterberg limits, Standard Proctor compaction test, direct shear test, and California Bearing Ratio (CBR) test. The mixture variations used consisted of 10% ferronickel slag combined with alkali solutions of NaOH and KOH at concentrations of 6%, 8%, and 10%. The results showed that the original soil was classified as fine-grained soil with high plasticity and a CBR value of 5.6%, indicating low bearing capacity. The addition of ferronickel slag and alkali reduced soil plasticity and increased soil strength and bearing capacity. Therefore, the mixture of ferronickel slag and alkali has the potential to be used as an environmentally friendly alternative soil stabilization material.  
Perencanaan Ulang Struktur Bawah Gedung dengan Fondasi Tiang Pancang: Studi Kasus Proyek Pembangunan Rumah Susun Pekerja Industri Batang III JTGRSN21-03 Abimanyu Wahyu P.S.P.; Adi Prasetyo Pambudi; Soedarsono, Soedarsono; Lisa Fitriyana
Journal of Engineering and Applied Technology Vol 2 No 1 (2026): : June: Scripta Technica: Journal of Engineering and Applied Technology
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/715f1x10

Abstract

Pile foundations play an important role in ensuring the stability of multi storey buildings subjected to axial loads, lateral loads, and moments. In the Batang III Industrial Worker Housing Project (JTGRSN21-03), the original foundation system used bored piles. This study redesigns the foundation into spun piles with a diameter of 0.80 m and a length of 12 m under the same soil conditions and loads. The research methodology was conducted through analysis of three foundation joints. Axial bearing capacity was evaluated using the Meyerhof method, resulting in a tip resistance of 946.00 kN, skin friction resistance of 2,970.37 kN, ultimate bearing capacity of 3,916.37 kN, and allowable bearing capacity of 1,305.46 kN. Lateral bearing capacity was analyzed using the Broms method with an allowable capacity of 162.0 kN. Group pile bearing capacity was determined using the Converse Labarre method. Settlement analysis using the Vesic method showed a single pile settlement of 22.69 mm and group settlements of 50.2 mm at joint 599, 41.8 mm at joint 628, and 21.0 mm at joint 371. Plaxis analysis produced smaller settlements of 13.94 mm, 13.44 mm, and 9.19 mm. The pile cap and shear wall design is considered safe.  
Evaluasi Kinerja Penanggulangan Kelongsoran Lereng pada Timbunan Tinggi Menggunakan Bronjong Berbasis Analisis Plaxis V24.3.0: Studi Kasus Candisari, Kota Semarang Nazala Trisnadyani; Nur Mukti Afiatillah; Lisa Fitriyana
Journal of Engineering and Applied Technology Vol 2 No 1 (2026): : June: Scripta Technica: Journal of Engineering and Applied Technology
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/4kj9y876

Abstract

This study evaluates the performance of gabion reinforcement in mitigating slope failure on a high embankment slope in Candisari, Semarang City, using finite element analysis based on PLAXIS V24.3.0. The research integrates field observations, laboratory geotechnical testing, and numerical simulation to investigate slope deformation behavior, safety factor characteristics, and hydro mechanical responses under varying groundwater conditions. The numerical model was developed using plane strain analysis with staged construction procedures and strength reduction factor methods to represent actual field conditions. The results indicate that the unreinforced slope experienced significant deformation and a critical safety factor associated with progressive failure mechanisms. The installation of gabion structures improved slope stability by reducing horizontal and vertical displacement, redistributing effective stress, and shifting the slip surface away from the critical zone. Variations in groundwater level significantly affected slope performance through increased pore water pressure and reduced effective stress conditions. The study confirms that gabion reinforcement provides effective structural resistance for high embankment slopes, although hydraulic sensitivity remains a controlling factor in long term stability performance.  
Pengaruh Siklus Beban Gempa Berulang terhadap Perilaku Tanah yang Diperkuat Geosintetik Muhammad Satria Pandu Justitia; Taufik Efendi Fadil; Pratikso, Pratikso; Lisa Fitriyana
Journal of Engineering and Applied Technology Vol 2 No 1 (2026): : June: Scripta Technica: Journal of Engineering and Applied Technology
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/qgeje324

Abstract

This study aims to analyze the effect of repeated seismic loading cycles on the mechanical behavior of geosynthetic-reinforced soil using a numerical simulation approach based on the finite element method. Modeling was performed using PLAXIS 2D v22, representing a 10-meter-high soil embankment on soft subgrade based on Standard Penetration Test data from the Solo–Yogyakarta Toll Road project at STA 0+616. Reinforcement systems using woven and non-woven geotextiles were modeled under cyclic loading conditions in the form of a sinusoidal wave with a maximum ground acceleration of 0.4562 g, a frequency of 0.8 Hz, and 50 loading cycles. The analysis results show that the use of geosynthetics is capable of improving system stability and significantly reducing deformation compared to unreinforced soil. Woven geotextiles produced the most optimal response with a maximum deformation of 2.699 × 10⁻³ m and a safety factor of 1.488 due to their higher tensile stiffness capacity. Non-woven geotextiles still improved soil performance, but their effectiveness was lower under repeated dynamic loading. The mechanical response of the soil is influenced by soil–geosynthetic interaction, dynamic stress distribution, reinforcement layer configuration, and cyclic loading characteristics. The research findings underscore the importance of integrating dynamic analysis into geotechnical design in earthquake-prone regions to enhance the long-term stability and resilience of infrastructure.    
Co-Authors Abdul Rochim Abimanyu Wahyu P.S.P. Adi Prasetyo Pambudi Ahmad Hidayawan Amariansah, Widayat Antonius Antonius Arafat Suleiman Yero Dzulfikar Sani Gatot Rusbintardjo Juny Andry Sulistyo Moch Dony Febriansyah Muhammad Satria Pandu Justitia Nazala Trisnadyani Nur Izzi M. Yusoff Nur Mukti Afiatillah Pratikso Pratikso Rekhan Farras Sutrisno Riko Bagus Setiyawan Soedarsono Soedarsono Soma Shaki Hadi Nugraha Taufik Efendi Fadil