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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL REKA RACANA Jurnal Rekayasa Sipil Jurnal Rekayasa Hijau Jurnal Rivet: Riset dan Invensi Teknologi
Pratiwi, Desti Santi
Lembaga Penelitian dan Pengabdian Masyarakat Institut Teknologi Nasional
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Engineering Transportation

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Analisis Stabilitas Lereng dalam Penanganan Longsoran di Jalan Tol Cipularang Km. 91+200 dan Km. 92+600 Menggunakan Metode Elemen Hingga (FEM) Hamdhan, Indra Noer; Pratiwi, Desti Santi
Jurnal Rekayasa Hijau Vol 1, No 2 (2017)
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat Institut Teknologi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (949.695 KB) | DOI: 10.26760/jrh.v1i2.1631

Abstract

ABSTRAKLongsoran terjadi di Jalan Tol Cipularang Km. 91+200 dan Km. 92+600. Longsoran terjadi karena adanya pergerakan pada lapisan batu lempung (clay shale), sehingga perlu adanya penanganan longsoran secara tepat dan efektif. Penanganan yang dipilih, yaitu dengan pemasangan perkuatan lereng berupa boredpile dan dinding penahan tanah. Dimensi boredpile yang digunakan yaitu berdiameter 80 cm. Analisis dilakukan dengan menggunakan Program Plaxis 2D yang berbasis metode elemen hingga, dengan memodelkan 2 (dua) kondisi yaitu kondisi eksisting dan kondisi dengan perkuatan. Analisis pada kondisi eksisting dilakukan dengan cara back analysis, sehingga hasil analisis kondisi eksisting sesuai dengan kejadian di lapangan. Analisis dilakukan di 6 (enam) titik untuk Km. 91+200 dan 2 (dua) titik untuk Km. 92+600. Dari hasil analisis didapat bahwa dengan adanya perkuatan pada lereng yang terjadi kelongsoran, nilai faktor keamanan naik hingga 242.2% dari kondisi eksisting.Kata Kunci: Longsor, Tol Cipularang, Km. 91+200 dan 92+600, Boredpile,  etode Elemen Hingga, faktor keamanan ABSTRACTThe landslide are occurred at Cipularang toll road Km. 91+200 and Km. 92+600. The landslide occur because of the movement of clay shale soil layer, it means should be handled witih appropriate and effective way. For this case, reinforcement slope using boredpile and gravity wall are choosen. Dimension of the boredpile is 80 cm. The analysis was calculated using Plaxis 2D with finite element method with two different type of calculating model : existing condition (without reinforcement) and with reinforcement condition. Analysis for existing model are done by back analysis method that will gave the real condition from the field. The analysis are done by calculated in 6 (six) point area of slope for Km. 91+200 and 2 (two) point area of slope for Km. 92+600. The safety factor (SF) of the slope will increase up to 214% after reinforcement.Keywords: Landslide, Cipularang Toll Road, Km. 91+200 and 92+600, Boredpile, Finite Element Method, Safety Factor 
Analisis Stabilitas pada Lereng Sungai yang Dipengaruhi Pasang Surut Hamdhan, Indra Noer; Pratiwi, Desti Santi
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 24, Nomor 1, JULI 2018
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1252.551 KB) | DOI: 10.14710/mkts.v24i1.17169

Abstract

The slopes on river banks close to the estuary can be affected by tides, so it can experience stability in the river bank. Therefore, this research is conducted to determine the stability of river bank due to tides with numerical analysis. The numerical analysis method was done by 2D Plaxis Software that using the Finite Element Method. The analysis was conducted on a homogeneous slope with 2 (two) different soil permeability coefficient values, there are low permeability and high permeability. The analysis is modeled by fully coupled analysis between deformation and ground water flow analysis. The results of the analysis indicate that a tidal are influence the stability of the slope based on the safety factor value. The highest of safety factor value are shown in high tide condition, and the lowest occur at low tide condition. This happens because the high tide condition occur the addition of hydraulic pressure from the water that will resist the sliding, while the low tide condition will reduce the hydraulic pressure. This can be a concern to the stability of river bank with tidal condition in order to avoid the erosion during the low tide conditions. The comparison of safety factors between two different types of soil permeability are not significant, the difference are only 3%.
Analisis Konstanta Pegas pada Fondasi Tiang (Studi Kasus: Gedung Type B DPRD Surabaya). (Hal. 42-51) Yakin, Yuki Achmad; Pratiwi, Desti Santi; Bilaldy, Berry Fawaz
RekaRacana: Jurnal Teknil Sipil Vol 6, No 1: Maret 2020
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaracana.v6i1.42

Abstract

ABSTRAKKonstanta pegas tanah (k ) merupakan suatu hubungan konsep pengertian di antara tekanan tanah dan defleksi. Nilai konstanta pegas sudah banyak digunakan di dalam analisis konstruksi bagian-bagian fondasi. Nilai  dipakai untuk menghitung besarnya reaksi pada kepala tiang atau besarnya penurunan elastis pada pondasi. Konstanta pegas pada tanah terdiri dari dua arah, yaitu arah vertikal dan arah horizontal. Pada penelitian ini akan dilakukan analisis perhitungan nilai  pada lapisan tanah pasir dan lempung menggunakan Program Lpile dan Allpile. Perhitungan nilai k  untuk arah horizontal dilakukan menggunakan metode kurva p-y (Program Lpile) sedangkan untuk arah vertikal menggunakan metode kurva t-z  (Program Allpile). Nilai k  yang didapatkan dari kurva p-y dan kurva t-z akan dibandingkan dengan metode konvensional yang biasa digunakan. Hasil analisis menunjukkan bahwa nilai k  arah horizontal dengan metode p-y lebih besar dibandingkan dengan konvensional, sedangkan nilai k  arah vertikal hasil metode t-z  lebih kecil dibandingkan dari metode konvensional.Kata Kunci: konstanta pegas tanah, N-SPT, kurva , kurva , Allpile, Lpile ABSTRACTThe soil spring constant (k ) is a correlation concept between soil pressure and deflection. The value of spring constant has been widely used in the analysis of foundation parts. The value is used to calculate the magnitude of the reaction at the pile head or elastic settlement in the foundation. Soil spring constant consists of two directions, vertical direction and horizontal direction. This research will analyze the calculation of the  value on sand and clay sil layers using Lpile and Allpile Program. Calculation of the  value for the horizontal direction was used the p-y curve methode (Lpilee Program), while for the vertical direction used the t-z cuve method (Allpile). The k values obtained from the p-y curve and th t-z curve will be compared with convntional methiods. The analysis results show that the horizontal k value with the  p-y method is greater than the conventional method, while the value in the vertical direction from the t-z method is smaller than the conventional method.Key Words: soil spring constant, N-SPT,  p-y curve, t-z curve, Allpile, Lpile
Analisis Stabilitas pada Lereng dengan Perkuatan Tanaman Vetiver Menggunakan Metode Elemen Hingga 3D Hamdhan, Indra Noer; Pratiwi, Desti Santi; Rahmah, Rizka Adisya Kamila
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 26, Nomor 2, DESEMBER 2020
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (869.677 KB) | DOI: 10.14710/mkts.v26i2.32003

Abstract

A landslide is the downslope movement of a soil mass or rock or debris of both (Bobrowski and Highlind, 2008). One of the measures to mitigate slope erosion that causes landslide is by applying bio-engineering system using a vegetation called Vetiver (Vetiveria Zizanioides). The purpose of  this study is to analyze slope stability with a vegetation system using PLAXIS 3D software based on finite elements method and referring to the guidelines from the Ministry of Public Works and Housing with the title Guidelines for Vetiver Grass Planting for Surface Erosion Control and Prevention of Shallow Landslides on Road Slopes.The result shows that the deeper the Vetiver root modelled will increase the value of the safety factor, reinforcement using vegetation is effective on 30° slopes in PLAXIS 3D. The percentage increase in the value of the safety factior generated by PLAXIS 3D is 10.94%.
Metode PVD dan Preloading sebagai Upaya Perbaikan Tanah Lunak di Proyek Jalan Tol Jambi Indonesia Pratiwi, Desti Santi; Abdurrahman, Faris Naufal
RekaRacana: Jurnal Teknil Sipil Vol 10, No 1: Maret 2024
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaracana.v10i1.29

Abstract

ABSTRAKPermasalahan tanah lunak sering menjadi fokus utama dalam pembangunan infrastruktur khususnya jalan tol. Tanah lunak akan mengalami proses konsolidasi yang merupakan proses terdisipasinya tekanan air pori berlebih akibat adanya beban dengan kurun waktu yang relatif lama. Hal tersebut dikarenakan tanah lunak memiliki ukuran dan nilai permeabilitas yang relatif kecil. Oleh karena itu upaya percepatan waktu konsolidasi perlu dilakukann untuk memangkas waktu konstruksi dan pada akhirnya dapat meminimalisisr biaya konstruksi. Penelitian ini bertujuan untuk mengetahui kombinasi preloading dan PVD sebagai upaya perbaikan tanah lunak di area pembangunan Jalan Tol Jambi Indonesia dengan menggunakan pendekatan Metode Elemen Hingga yang berbasis Metode Numerik. Perencanaan PVD yang digunakan yaitu pola segitiga dengan spasi dan kedalaman yang divariasikan. Berdasarkan hasil analisis, PVD dengan kedalaman 4 m dan spasi 1,5m dapat mereduksi hingga 90% waktu penurunan yang akan terjadi, sehingga kombinasi tersebut disarankan dalam pengaplikasiannya di lapangan.Kata kunci: tanah lunak, konsolidasi, metode elemen hingga, PVD, waktu penurunan ABSTRACTSoft soil problems are often the main focus of infrastructure development, especially toll roads. Soft soil will experience a consolidation process that dissipates excess pore water pressure due to loads over a relatively long period of time. This is because soft soil has a relatively small size and permeability value. Therefore, efforts to accelerate consolidation time need to be made to cut construction time and ultimately minimise construction costs. This research aims to determine the combination of preloading and PVD as an effort to improve soft soil in the Jambi Indonesia Toll Road construction area using a finite element method approach based on numerical methods. The PVD plan used is a triangular pattern with varied spacing and depth. Based on the analysis results, PVD with a depth of 4 m and a spacing of 1.5 m can reduce up to 90% of the settlement time, so this combination is recommended for application in the field.Keywords: soft soil, consolidation, finite element method, PVD, settlement time  
Pengaruh Perbandingan Nilai Termal Terhadap Deformasi Fondasi Tiang Energi Menggunakan Metode Numerik Pratiwi, Desti Santi; Naufal Shidqi, Gary Muhammad
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 30, Nomor 1, JULI 2024
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v30i1.58552

Abstract

A thermal energy foundation is an innovative combination of a foundation structure with thermal pipes that can absorb geothermal heat. This allows it to serve as an alternative source of electricity for the building above it. The goal of this technology is to help achieve sustainable infrastructure targets by minimizing the use of fossil fuels from a geotechnical perspective. This study aims to analyze the thermal effect on foundation deformation using the Finite Element Method approach. The modelling is done using PLAXIS software with element meshes to provide comprehensive deformation results. Additionally, the model is used to vary the thermal parameters of the soil and the quality of the foundation concrete. The analysis results indicate that variations in thermal conductivity values lead to a 34.112% decrease in deformation due to reduced thermal conductivity, while variations in the quality of concrete used in the foundation show a relatively small or insignificant effect on the deformation.
Sebuah Studi Daya Dukung dan Penurunan Tiang Bor Menggunakan PLAXIS 3D Berdasarkan Data N-SPT Pratiwi, Desti Santi; Winoto, Ghozi Warsih
JURNAL RIVET Vol 5 No 01 (2025): Juni 2025
Publisher : Program Studi Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47233/rivet.v5i01.2071

Abstract

The foundation is essential in construction, as it transfers the building's load to the ground. This study evaluates the axial and lateral bearing capacities and settlement of bored pile foundations using PLAXIS 3D with Mohr-Coulomb and Hardening Soil material models. The results are compared with field tests from the PDA and Static Loading Tests. The Results show that the choice of material model significantly influences bearing capacity and settlement. The highest axial bearing capacity recorded was 7,384.41 kN, and the lateral capacity was 393 kN, achieved with the Mohr-Coulomb model and Linear Elastic pile material. The settlement results from PLAXIS 3D were generally lower than those from the PDA Test, with a deviation of 5–13%. In contrast, the axial bearing capacities from PLAXIS 3D exceeded those from the Static Loading Test by about 1–14%. This study underscores the importance of selecting the appropriate soil constitutive model to ensure that numerical simulations reflect real-world conditions accurately.
Sebuah Pemodelan Numerik Fondasi Dangkal di Atas Tanah Lempung yang Dipengaruh Beban Dinamik Pratiwi, Desti Santi; Setiawan, Muhammad Raihan Aulia
Jurnal Rekayasa Sipil Vol. 21 No. 1 (2025)
Publisher : Civil Engineering Departement, Andalas University

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

Abstract

Gempa bumi merupakan bencana alam yang sulit diprediksi dan dicegah. Selain itu, gempa bumi dapat menimbulkan tekanan tambahan dan kehancuran infrastruktur. Gerakan tanah yang ditimbulkan oleh gempa bumi harus diperhitungkan ketika merancang bangunan, khususnya untuk struktur geoteknik seperti fondasi. Fondasi sangat penting dalam mendukung bangunan atas. Oleh karena itu, perlu dilakukan penelitian terhadap fondasi yang terkena beban gempa. Penelitian ini bertujuan untuk mengetahui pengaruh beban dinamis yang bersumber dari gerakan tanah, secara bervariasi, yang dikenai fondasi dangkal dengan Analisis Respon Situs Non Linier dengan Metode Numerik. Gerakan tanah yang digunakan berdasarkan data yang tercatat di Jepang (2007), Taiwan (1999), dan Italia (1980). Selain itu, lapisan tanahnya terdiri dari lempung homogen dengan tiga konsistensi yaitu lunak, sedang, dan keras yang dimodelkan dengan material Hardening-Soil Small. Penelitian kami mencakup pengamatan deformasi dan waktu yang menunjukkan terjadinya gerakan tanah terbesar. Hasil analisis menunjukkan bahwa deformasi tertinggi, baik vertikal maupun horizontal, terjadi pada tanah lunak. Gempa Taiwan menghasilkan deformasi horizontal tertinggi dibandingkan gempa lainnya. Namun, deformasi vertikal tertinggi dihasilkan oleh gerakan tanah pada gempa Italia. Berdasarkan hasil intensitas arias terlihat bahwa durasi gempa antara 10% hingga 90% adalah lebih dari 9 detik untuk seluruh gempa.
Co-Authors Abdurrahman, Faris Naufal Bilaldy, Berry Fawaz Hamdhan, Indra Noer Lesmana, Nirpan Naufal Shidqi, Gary Muhammad Rahmah, Rizka Adisya Kamila Setiawan, Muhammad Raihan Aulia Winoto, Ghozi Warsih Yuki Achmad Yakin, Yuki Achmad