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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik ITS IPTEK Journal of Proceedings Series Journal of Engineering and Technological Sciences Syntax Literate: Jurnal Ilmiah Indonesia Civil Engineering Dimension Jurnal Aplikasi Teknik Sipil Jurnal Transportasi: Sistem, Material, dan Infrastruktur Jurnal Intake : Jurnal Penelitian Ilmu Teknik dan Terapan Jurnal Manajemen Teknologi dan Teknik Sipil (JURMATEKS) Journal of Infrastructure and Facility Asset Management Interdisciplinary Social Studies Jurnal Impresi Indonesia Indonesian Geotechnical Journal Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan Riwayat: Educational Journal of History and Humanities
Lastiasih, Yudhi
Civil Engineering Department, Faculty Of Civil Engineering And Planning, Institut Teknologi Sepuluh Nopember
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Alternatif Perencanaan Oprit Jembatan Batanghari (STA 15+750) di Jalan Tol Ruas Jambi – Rengat Irfanil Azami, Fikri; Lastiasih, Yudhi
Jurnal Manajemen Teknologi & Teknik Sipil Vol. 7 No. 2 (2024): DECEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/jurmateks.v7i2.6288

Abstract

Batanghari Bridge is part of the Jambi-Rengat Toll Road, faces significant challenges due its clay as the topsoil and dominant stratigraphy of sand. These contdition lead to high settlement potential and stability issues under heavy loads, requiring innovative to enhance stability and control costs. This study aims to evaluate the effectiveness of a combination of mortar foam and ordinary soil on at the Batanghari Bridge (STA 15+750). Observations were made at 2 abutments. Embankment material variation include 100% ordinary soil, 100% mortar foam, and combinations of 25%, 50%, and 75%. Results reveal that land subsidence from embankment loads and mortar foam remains high, necessitating alternative treatments. The findings indicate that for Abutment 1 benefits from Prefabricated Vertical Drain (PVD) and geotextile reinforcement, combined with 75% ordinary soil and 25% mortar foam. This approach reduces load and enhances stability at a cost of Rp29,045,321,602. Conversely, Abutment 2, with a 3-meter soft soil depth, achieves optimal results using 100% ordinary fill soil with replacement and geotextile reinforcement, costing Rp22,403,576,498. It was found that the differences in effective methods at Abutment 1 and Abutment 2 were caused by variations in subgrade conditions and soft soil depth at both locations. The study highlights the importance of tailoring embankment material and soil improvement methods to specific subgrade conditions. By demonstrating the effectiveness of combining material variations with soil improvement techniques, the findings contribute significantly to geotechnical engineering, offering practical, cost-efficient strategies for similar infrastructure projects    
Perencanaan Reklamasi dan Shore Protection Pulau G Teluk Jakarta Pribadio, Nabila Cahayuni; Wahyudi, Herman; Lastiasih, Yudhi
Jurnal Teknik ITS Vol 14, No 1 (2025)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v14i1.155797

Abstract

Reklamasi merupakan usaha untuk menambah lahan berdasarkan peningkatan kebutuhan lahan untuk kedepannya. Salah satu kegiatan reklamasi yang akan dilakukan adalah reklamasi Pulau G di Provinsi DKI Jakarta. Dengan meningkatnya kebutuhan hunian masyarakat di lokasi DKI Jakarta, perluasan Pulau G merupakan salah satu usaha untuk memenuhi kebutuhan tersebut. Berdasarkan data tanah, kondisi tanah dasar pada area reklamasi kurang menguntungkan untuk dilakukannya reklamasi. Kondisi tanah dasar pada perairan pantai dominan berjenis lempung dan sedikit tanah lanau dengan NSPT nol hingga kedalaman 10 meter. Karena hal tersebut, tanah dasar memiliki stabilitas yang rendah. Selain itu, tanah dasar yang dominan lempung juga mengakibatkan pemampatan yang besar jika diberi timbunan dengan volume yang besar. Timbunan reklamasi terletak pada perairan laut yang mengakibatkan pastinya ada gangguan oleh gelombang air laut. Maka dari itu selain perkuatan, dibutuhkan percepatan pemampatan tanah dasar dan bangunan pengaman pantai untuk mengatasi masalah tersebut. Dari hasil perencanaan, diperoleh perencanaan percepatan konsolidasi dengan menggunakan Prefabrifated Vertical Drain dengan spesifikasi CT-D812 panjang pemasangan 8 m jarak 1,5 pola persegi. Untuk memperkuat stabilitas tanah dasar akibat timbunan awal, direncanakan sandkey dengan ketebalan pada Zona 1, Zona 2, dan Zona 3 secara berturut-turut yaitu 7 m, 7 m, dan 4 m sehingga diperoleh rata-rata safety factor pada kondisi statis sebesar 1,58; 2,09; dan 3,56. Sedangkan safety factor pada kondisi seismik sebesar 1,30; 1,22; dan 1,84. Shore protection dipasang menggunakan material batu pecah sepanjang lereng tinggi timbunan Lebar puncak shore protection pada Zona 1, Zona 2, dan Zona 3 berturut-turut yaitu 1,5 m; 2,0 m; dan 4,0 m.
Modifikasi Jembatan Ciloseh di Tasikmalaya Menggunakan Sistem Jembatan Busur Box Baja Setiawanda, Aditya; Masiran, Hidayat Soegihardjo; Lastiasih, Yudhi
Jurnal Teknik ITS Vol 14, No 1 (2025)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v14i1.146550

Abstract

Pada umumnya jembatan busur merupakan suatu struktur konstruksi yang berfungsi untuk menghubungkan dua bagian jalan yang terputus akibat beberapa kondisi seperti lembah yang dalam, alur sungai, danau, saluran irigasi, kali, jalan kereta api, jalan raya yang melintang tidak sebidang dan lain-lain. Adapun pengertian jembatan menurut ahli yaitu komponen infrastruktur yang sangat penting karena berfungsi sebagai penghubung dua tempat yang terpisah akibat beberapa kondisi. Jembatan Ciloseh merupakan jembatan yang akan dibangun di Jawa Barat tepatnya berada di Kota Tasikmalaya, Kecamatan Purbaratu yang melintasi Sungai Ciloseh. Pada saat ini Jembatan Ciloseh akan direncanakan dengan menggunakan sistem cable stayed dengan bentang yang diterima adalah sepanjang 165 m dan bentang pendekat menggunakan concrete girder sepanjang 84,45 m. Pada perencanaan tersebut tidak sesuai dengan bentang ekonomis sebuah jembatan. Jembatan Ciloseh akan dimodifikasi dengan menggunakan konstruksi busur box baja dengan bentang total 250 m dan bentang utama 150 m. Adapun lebar jembatan yang akan direncanakan adalah sepanjang 18 m dengan 4 lajur kendaraan, dimana desain awal jembatan ini memiliki lebar jembatan sepanjang 36 m dengan 6 lajur kendaraan. Jembatan tipe busur dipilih karena dengan bentang yang direncanakan jembatan tipe busur termasuk jembatan dengan bentang ekonomis. Pemilihan busur box baja pun dipilih karena jembatan ini direncanakan untuk ikon Kota Tasikmalaya. Bentuk konstruksi busur juga dimaksudkan untuk mengurangi momen lentur pada jembatan sehingga penggunaan bahan menjadi lebih efisien.
Analysis of Soft Soil Setting with Reinforcement Grouped Stone Column Yudistira, I Gede Ngurah Arya; Lastiasih, Yudhi
Riwayat: Educational Journal of History and Humanities Vol 6, No 4 (2023): Educational, Historical Studies and Humanities
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jr.v6i4.36738

Abstract

The usage of stone columns in geotechnical practice is an common method for reinforcing soft soil. Soft soils often exhibit large consolidation behavior and low shear strength, requiring remedial action to support the structures above them. Stone columns are installed by embedding better materials into soft soil with the aim of increasing the bearing capacity and stability of the soil. This research examines the settlement behavior of soft soil reinforced with stone columns using finite element method analysis, with data from the finite element method analysis validated with field loading test data. From the results of the study, it is found that the behavior of stone columns in groups are different from single stone column. The behavior of grouped stone columns is strongly influenced by the area replacement ratio. When the ratio is large enough, the type of failure of the stone column tends to be shear failure, while the ratio is low, the reinforced behavior of the stone column tends to experience bulging failure. The settlement behavior of soft soil reinforced with stone columns is also greatly influenced by the area replacement ratio. It was found that the smaller the area replacement ratio, the greater the settlement that occurs.
Studi Mekanisme Kelongsoran dan Alternatif Penanganan Tanah Lunak Pada Ruas Jalan Tol Indrapura – Kisaran (STA 112+850 – STA 112+900) Haririi, Adnan; Wahyudi, Herman; Lastiasih, Yudhi
Jurnal Manajemen Teknologi & Teknik Sipil Vol. 8 No. 1 (2025): JUNE
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/jurmateks.v8i1.6652

Abstract

Embankment stability is a critical aspect of transportation infrastructure projects, especially in constructing on soft soil. Soft soil has low bearing capacity, high compressibility and low permeability. These characteristics increase the risk of structural failure, such as landslides and excessive settlement necessitating appropriate reinforcement methods. Beyond safety consedirations, soil strengthening must also factor in cost-effectiveness and construction time  to ensure an efficient and economical approach. This study aims to evaluate the effectiveness of Prefabricated Vertical Drain (PVD), geotextile, spun pile, as well as a combination of PVD and geotextile reinforcement methods. Field investigations and laboratory test provided soil and geometric data. This data is used as input in modeling using a finite element approach with Plaxis 2D software. The analysis results include safety factor (SF) values, ​​which are then calculated for strengthening costs and implementation time. A multi-criteria analysis is employed to determine the most optimal reinforcement method based on SF, cost, and implementation duration. The results indicate that the combination of PVD and geotextile provides the highest value, with a safety factor of 1.73, construction costs of IDR 1.57 billion, and implementation duration of 90 days. This strengthening is able to balance the three aspects considered. The combination of PVD which accelerates consolidation and geotextiles which strengthen the embankment structure has been proven to increase stability without significantly increasing costs. These findings contribute to the optimization of soft soil strengthening strategies in selecting efficient and economical strengthening methods.
Studi Alternatif Perkuatan Desain Timbunan Pada Pekerjaan Proyek Pembangunan Jalan Tol Binjai-Pangkalan Brandan Sta 55+500 Permana, Muhammad Yuanto; Lastiasih, Yudhi
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : Syntax Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/syntax-literate.v10i9.61481

Abstract

Land acquisition in toll road construction is crucial for smooth construction. The lengthy land acquisition process often results in projects that have begun construction but still have some land that has not been acquired. This occurred in the Trans-Sumatra Toll Road Project, Binjai-Langsa Section, Binjai-Pangkalan Brandan STA 55+500. In this section, there are still public cemeteries that have not been acquired and are awaiting relocation to new locations. This situation disrupts the toll road construction process, necessitating the use of vertical embankments as an alternative to sloped embankments, which require lengthy land acquisition. The use of alternative embankment management methods is an effort to ensure the project is completed within the agreed timeframe. The use of alternative vertical embankment methods will require reinforcement planning for the embankment. Alternative reinforcement methods for vertical embankments include geotextiles, sheet piles, and Geoforce Segmental Retaining Walls. These methods could be an alternative to using vertical embankments due to land acquisition limitations. Geotechnical analysis was conducted using a geotechnical analysis aid program based on LEM to determine the requirements for the selected reinforcement method. In the case of this toll road construction, using geotextile reinforcement would require one layer of 200kN geotextile, a 13-meter-long concrete sheetpile, or a 2.5-meter-high, 50-meter-wide geoforce segmental wall.
Alternatif Penanggulangan Masalah Longsoran Tebing (Studi Kasus Lereng Km 20+300 Ruas Tol Pekanbaru-Kandis-Dumai) handoko, yohan; Lastiasih, Yudhi; Mochtar , Indrasurya Budisatria
Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan Vol 13 No 2 (2025): Jurnal Konstruksi dan Infrastruktur Vol 13 No.2 : Oktober 2025
Publisher : Civil Engineering Department, Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jki.v13i2.10724

Abstract

The Pekanbaru-Kandis-Dumai Toll Road passes through a hilly topography with steep valleys. In April 2024, a landslide occurred at Station 20+300, disrupting toll road traffic towards Pekanbaru. This condition forces the toll road to be cut and follow the contours to obtain both horizontal and vertical alignments. The purpose of this study was to determine the cause of the landslide and to find alternative repair methods using Geo5 analysis with two methods: crack soil approaches.The results of the analysis of existing conditions with the conventional method, the safety factor value is 1.082 and the crack soil method obtained a value of 0.882. After being reinforced with secant piles, the static safety factor value is 1.56 and the earthquake safety factor value is 1.122.
Analysis of Excavated Slope Stability on the TRSS of Blitar Regency with a Cracked Soil Approach Muhammad Arifian Ilham; Herman Wahyudi; Yudhi Lastiasih
Interdisciplinary Social Studies Vol. 5 No. 1 (2025): Interdisciplinary Social Studies
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/iss.v5i1.985

Abstract

The construction of the Southern Cross Line (JLS) in East Java Province is part of the National Strategic Project which aims to reduce the disparity between the northern and southern regions of Java Island. In STA 17 + 850 of the Bululawang–Sidomulyo–Tambakrejo section, the excavated slope of ±30 m high composed of limestone rocks experienced two landslides in the same segment (slope 2 and slope 3), although slope geometry has been improved through regrading from a slope of 71.6° to 45°. This study aims to analyze the main causes of landslides at the location using the cracked soil approach, as well as evaluate the effect of slope slope on the safety factor (SF) value. The concept of cracked soil refers to the existence of cracks, it can be in the form of fine cracks that are not visible visually or wide cracks, these cracks can function as rainwater infiltration pathways that can trigger collapse. The soil condition on the slope is modeled as a "behaving like sand" material with a "drained" condition (c = 0 and ? = ?). The analysis method was carried out using the Finite Element Method (FEM) with the Plaxis 2D auxiliary program through two main models. Model 1 models the soil material to be "behaving like sand" (c = 0 and ? = ?), so that the collapse is completely controlled by the inner shear angle in the absence of cohesion. Model 2 includes a polygon such as ground cracks placed on or near a slip plane, thus facilitating a specific c = 0 on that plane with variations in the width and depth of the cracks. Stability analysis at the initial conditions (after excavation) showed an SF value of >> 1, which did not yet represent the landslide conditions in the field. Through the cracked soil approach, an SF value of < 1 was obtained for both slope slope variations, both in model 1 and model 2. These results show that the cracked soil approach can be applied to explain the mechanism of landslides on the slope of STA 17 + 850 of the Bululawang-Sidomulyo-Tambakrejo Section.
Studi Perkuatan Timbunan pada Tanah Lunak dengan Perkuatan Rigid Inclusion (Studi Kasus: Jalan Tol Padang – Sicincin Sta 5+825 – 5+925) Muhron Nafik; Herman Wahyudi; Yudhi Lastiasih
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : Syntax Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/syntax-literate.v11i6.64654

Abstract

Pembangunan infrastruktur jalan tol memerlukan perhatian khusus terhadap kondisi tanah dasar dengan daya dukung rendah dan potensi penurunan besar. Ruas Tol Padang – Sicincin STA 5+825 – 5+925 dibangun di atas tanah alluvial yang didominasi lanau sangat lunak dengan kandungan organik tinggi, sehingga memerlukan metode perkuatan yang efektif. Salah satu metode yang digunakan adalah Rigid Inclusion (RI), yang bekerja dengan prinsip transfer beban melalui elemen kaku menuju lapisan tanah yang lebih kuat. Penelitian ini bertujuan untuk menganalisis stabilitas dan penurunan timbunan dengan metode Rigid Inclusion dan mengevaluasi pengaruh variasi desain (diameter, jarak antar kolom, dan kedalaman). Analisis dilakukan menggunakan perangkat lunak Plaxis 2D pada studi kasus proyek Tol Padang – Sicincin. Selain metode Rigid Inclusion (RI), penelitian ini juga menganalisis alternatif metode perkuatan tanah berupa Prefabricated Vertical Drain (PVD) dengan Preloading sebagai bahan perbandingan dalam penanganan kondisi tanah dengan karakteristik serupa. Hasil analisis menunjukkan bahwa pada kondisi eksisting dengan diameter kolom 0,42 m, spasi 1,6 m, dan kedalaman 13 m, diperoleh nilai faktor keamanan statik sebesar 2,101 dan faktor keamanan gempa sebesar 1,100 dengan total penurunan 1,454 cm dalam 10 tahun, semua memenuhi persyaratan SNI. Metode Rigid Inclusion terbukti lebih efektif dibandingkan PVD Preloading dalam hal pengendalian penurunan dan stabilitas terhadap beban gempa.
Study Alternatif Perkuatan Tanah Lunak Pada Pekerjaan Timbunan Proyek Jalan Bebas Hambatan IKN Segmen Pulau Balang – Simpang Riko Seksi 5B STA 3+525 – 3+650 Adventus Kristian Tambunan; Yudhi Lastiasih; Herman Wahyudi
Jurnal Impresi Indonesia Vol. 5 No. 7 (2026): Jurnal Impresi Indonesia
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jii.v5i7.8000

Abstract

Jalan Bebas Hambatan IKN segmen Jembatan Pulau Balang – Simpang Riko seksi 5B merupakan bagian dari jaringan jalan tol penunjang Ibu Kota Negara Nusantara. Pada ruas tersebut, terdapat lokasi pekerjaan yang melewati tanah lunak di Sta 3+525 – 3+650 yang dalam dokumen RTA direncanakan timbunan tanpa penanganan tanah dasar, sehingga berisiko terjadi penurunan elevasi jalan jangka panjang. Penelitian ini bertujuan menganalisis desain awal sesuai RTA, mengidentifikasi alternatif perbaikan tanah untuk penurunan dan stabilitas, serta menentukan metode paling efisien dan efektif. Metode yang digunakan meliputi analisis pemampatan dan stabilitas secara manual serta pemodelan numerik Plaxis 2D pada tiga alternatif: substitusi tanah (1m, 2m, 3m), PVD (pola segitiga/segiempat spasi 1m/1,5m), dan mini pile (6m, 8m, 12m), kemudian dievaluasi dengan analisis pro-kontra berdasarkan stabilitas, biaya, waktu, dan workability. Hasil menunjukkan desain awal tanpa penanganan tanah lunak tidak memenuhi kriteria desain karena derajat konsolidasi 90% baru tercapai dalam 9,28 tahun, melampaui masa konstruksi 9 bulan. Metode substitusi 3m menghasilkan penurunan 0,30m dan waktu konsolidasi 6,36 bulan, PVD segitiga spasi 1m menghasilkan penurunan 0,82m dengan waktu konsolidasi <6 bulan, sedangkan mini pile 12m menghasilkan penurunan terkecil (0,20m) dan faktor keamanan tertinggi (2,09). Berdasarkan analisis pro-kontra, metode substitusi 3m dengan perkuatan geotekstil merupakan alternatif paling efisien secara keseluruhan dengan skor tertinggi (3,8), mengungguli PVD (3,7) dan mini pile (2,6).
Co-Authors Adrian Hartanto Adventus Kristian Tambunan Ali Kurniawan Ngunaidi Anambi Mono Yudianto Angga Indra Kusuma Apriana Hanggara Dewi FX Toha handoko, yohan Haririi, Adnan Herman Wahyudi Herman Wahyudi Indra Djati Sidi Indra Djati Sidi Indrasurya B. Mochtar Indrasurya B. Mochtar Indrasurya B. Mochtar Indrasurya B. Mochtar Indrasurya B. Mochtar Indrasurya B. Mochtar Indrasurya Budisatria Mochtar Indrasurya Mochtar Irfanil Azami, Fikri Isti Qomariyah Izzuddin Ismawanto Kautsar Rizki Nashrullah Lalu Arpi Wartoyo Masiran, Hidayat Soegihardjo Masyhur Irsyam Moch. Alfian Putra Adi Mochtar , Indrasurya Budisatria Muhammad Arifian Ilham MUHAMMAD ILHAM GUMILANG SYAFEI Muhammad Ivan Adi Perdana Muhammad Ivan Adi Perdana Muhron Nafik Nasya, Farah Noor Endah Mochtar, Noor Endah Nur &#039;Arfiati Shoffiana Nur ‘ Arfiati Shoffiana Peri Joni Permana, Muhammad Yuanto Pribadio, Nabila Cahayuni Putu Tantri K. Sari Putu Tantri KSari Putu Tantri Kumala Sari Rakhman Taufik Rakhman Taufik Rewin Alif Bagus Wicaksono Riky Dwi Prasetyo Savira Amelia Ramadhan Septiandri, Rohmahillah Aviskanasya Setiawanda, Aditya Sugiarto Sugiarto Suwarno Suwarno Trihanyndio Rendy S, Trihanyndio Rendy Tsasca Dewi Arsyia Asyiffa Wahyudi, Herman Wahyudi, Herman Yudha Pratama Narra Putra Yudistira, I Gede Ngurah Arya Zefira Wisna Maulidha