http://hdl.handle.net/123456789/54703 Mon, 27 Apr 2026 08:52:58 GMT 2026-04-27T08:52:58Z http://hdl.handle.net/123456789/56302 Analisis perencanaan fondasi tiang pancang dengan variasi diameter pada tower Pegadaian Rochmatullah, Hamim Farchan Noor; Amalina, Anisa Nur; Marzuko, Akhmad The foundation serves as the crucial support structure for a building, bearing the weight of the structure above. In the construction of the Pegadaian Tower Building on Jalan Kramat Raya, Central Jakarta, drilled pile foundations with a 1.0 m diameter and a length of 39 m were utilized. This study aims to reassess the design of these drilled pile foundations by considering variations in diameter to investigate their impact on loadbearing capacity and settlement. Four diameter variations, namely 0.7 m, 0.8 m, 0.9 m, and 1.0 m, were evaluated, all with a consistent pile length of 39 m. Data from the Detail Engineering Design (DED), Standard Penetration Test (SPT), and existing foundation information were employed for analysis. Structural analysis was conducted using SAP2000 version 14. The support capacity of the drilled pile foundations was assessed using the Skempton and Tomlinson methods, while the Meyerhoff and Tomlinson methods were applied for pile foundations. Reduction calculations for single piles were performed using the Poulus and Davis method, and for pile groups, the Vesic and 2:1 Spread methods were utilized. The analysis identified the 1.0 m diameter option, calculated using the Tomlinson method, as the most suitable. This configuration consisted of five piles within a group, providing a total support capacity (Qg) of 12554.91 kN, exceeding the axial load (P) of 11436.13 kN. Settlement analysis revealed a decrease of 25.57 cm, which, upon recalculating the pile length to 42 m and distance using the formula 2.5D + 0.02L, resulted in a settlement of 13.89 cm—below the permissible limit of 15.17 cm. Thus, the foundation's capacity and settlement meet safety requirements, confirming its viability for use. Wed, 07 Feb 2024 00:00:00 GMT http://hdl.handle.net/123456789/56302 2024-02-07T00:00:00Z http://hdl.handle.net/123456789/56301 Analisis stabilitas timbunan tanah menggunakan perkuatan geotekstil dengan software Geostudio Nadhif, Farrel Muhammad; Abdurrozak, Muhammad Rifqi Pemalang – Batang Toll Road project is located in Central Java Province. The soil conditions at the project site are highly diverse. Previosly the existing soil was a rice fields area which has a high potential for landslides and soil settlement due to the presence of embankment slopes. Therefore, a slope stability analysis is required for the embankment on the existing soil of the toll road. The stability analysis of the embankment slope is calculated using the limit equilibrium method using SLOPE/W Geostudio 2018 with varitions in embankment height at 6 meters, 8 meters, and 10 meters. Additionally, a manual calculation is conducted using the fellenius method for the 10 meter embankment. The embankment slope is considered safe if it meet the minimum requirements of the factor of safety (FoS≥1,5) without the seismic load, if affected with seismic load the minimum requirements of the factor of safety (FoS≥1,1). Embankment that did not meet the minimum requirements will be reinfornced using geotextile with an ultimate tensile strength of 55 kN/m. The analysis result for all of the variations without the seismic load have met the required factor of safety (FoS≥1,5). However the 8 meters and 10 meters variations with the seismic load have not met the minimum requirements of the factor of safety (FoS≥1,1), so it require reinforcement using geotextile. After reinforcement with geotextile, the factor of safety (FoS) values for the embankments with heights of 8 meters, and 10 meters are 1,267, and 1,638 respectively. These values meet the required factor os safety (FoS≥1,1). The total settlement that occurs directly on the 10 meter embankment slope is 2,201 cm, which is well within the allowable settlement limit of 131,667 cm. Wed, 07 Feb 2024 00:00:00 GMT http://hdl.handle.net/123456789/56301 2024-02-07T00:00:00Z http://hdl.handle.net/123456789/56300 Perbandingan gerusan pada bendung di hilir kolam olak tipe vlughter dengan proteksi riprap dan groundsill Mas’ad, Ihlasul Mubasir; Pratiwi, Dwi Astuti Wahyu Wulan; Fadilah, Shofwatul Hydraulic jump is a phenomenon occurring in channels due to a change in flow from supercritical to subcritical. This phenomenon can be found in dam structures where the stilling basin becomes a crucial part of the dam that needs to be well-designed to dissipate the energy resulting from the hydraulic jump. However, downstream issues in dam bodies also often arise in the form of erosion in the downstream part of the dam's stilling basin (endsill). Therefore, this study focuses on the investigation of erosion protection downstream of the dam to determine the optimal protection type to reduce erosion in the downstream area. The erosion study was conducted at the Hydraulics Laboratory, Department of Civil Engineering, Universitas Islam Indonesia, using a sluice gate model with a vlughter-type stilling basin subjected to three variations of the upstream flow depth (h0). The flow was allowed to run for 60 minutes in each variation. The study involved two experimental conditions: one without protection and the other with protection using riprap and groundsill. The channel bed material used was fine sand (with a sieve diameter of 7mm) with a thickness of 5 cm along the channel. The experimental results indicate that the magnitude of erosion is influenced by the flow velocity and upstream flow depth (h0) and is also affected by gravity (Froude number) and Reynolds number. Based on the observations of erosion experiments in the downstream stilling basin, it can be concluded that using riprap protection is more effective in reducing erosion compared to groundsill protection. Wed, 07 Feb 2024 00:00:00 GMT http://hdl.handle.net/123456789/56300 2024-02-07T00:00:00Z http://hdl.handle.net/123456789/56299 Analisis tingkat keandalan Bendungan Bendo Ponorogo Setiawan, Mokhammad Zaki; Astuti, Sri Amini Yuni Population growth which increases every year affects water demand, resulting in an imbalance between water availability and water demand. With the construction of the Bendo Dam, it is hoped that it will be able to accommodate river flow and rainwater that falls on the dam so that it can be used to meet the irrigation water needs of rice fields and the community's raw water needs throughout the year.This calculation includes hydrological analysis, dam characteristics analysis, water availability analysis using the F.J. Mock, water demand analysis and reliability analysis. Dam reliability analysis is obtained from water balance simulations and the dam's level of reliability to serve the community's water needs.The dam storage capacity is 43,114,234.00 m3 with live storage of 33,938,148.00 m3 and dead storage of 9,176,086.00 m3.The level of reliability of the Bendo Dam to meet raw water needs with 10 years projection until 2031 and irrigation water needs with a rice field area of 3299 ha obtained an average level of reliability of 26.69%.. The average level of reliability is still very low, only part of it can be served, so optimization needs to be done to get a reliability level of 100%. The optimization level of reliability is obtained if the water requirement is only to serve the projected raw water needs for 2031 with a population of 230,154 people in 3 sub-districts (namely Sawoo Subdistrict, Mlarak Subdistrict, and Badegan Subdistrict), and serving irrigation needs with a rice field area of 600 ha Wed, 07 Feb 2024 00:00:00 GMT http://hdl.handle.net/123456789/56299 2024-02-07T00:00:00Z