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INDONESIA
Inersia : Jurnal Teknik Sipil dan Arsitektur
Published by Universitas Negeri Yogyakarta
ISSN : 0216762X     EISSN : 2528388X     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
INERSIA is stand for INformasi dan Ekspose hasil Riset Teknik SIpil dan Arsitektur. This scientific journal is managed by the Department of Civil Engineering and Planning Education, Faculty of Engineering, Yogyakarta State University, in cooperation with the Persatuan Insinyur Indonesia (PII). It publishes and disseminates research results from lecturers and post graduate students from various universities in Indonesia, which has contributed to the development of science and technology, especially in the field of Civil Engineering and Architecture. INERSIA is published twice a year, in May and December.
Arjuna Subject : -
Articles 14 Documents
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Search results for , issue "Vol. 21 No. 1 (2025): May" : 14 Documents clear
Spatial Distribution Analysis of Geotechnical Properties (Elastic Modulus, Cohesion, and Internal Friction Angle) in Soil Layers of Bengkulu City Hanipa, Rerisa Al; Kamal, Thomas Mustafa; Fikri, Muhammad Haikal; Mase, Lindung Zalbuin; Misliniyati, Rena; Supriani, Fepy; Refrizon, Refrizon
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.78611

Abstract

This study investigates the spatial distribution of key geotechnical parameters—namely modulus of elasticity, cohesion, and internal friction angle—in the dominant soil types of Bengkulu City, Indonesia. Given the region’s complex geological structure and vulnerability to seismic activity, accurate assessment of soil characteristics is essential to support infrastructure development and mitigate geotechnical risks. Bengkulu lies between two active tectonic faults, making soil behavior analysis a crucial component of earthquake-resistant design. A total of 215 geotechnical data points were compiled from previous field investigations, covering a wide range of lithologies, including sandy soils, clay deposits, and various rock layers. The geotechnical parameters were spatially interpolated using the Inverse Distance Weighting (IDW) method to generate distribution maps that visualize the variation across different soil layers. This method was selected for its simplicity, effectiveness, and ability to provide weighted estimates based on spatial proximity. The analysis reveals that soils in the southern coastal region generally exhibit lower values of modulus of elasticity and cohesion, indicating a higher potential for deformation and shear failure. In contrast, central and northern areas tend to show higher geotechnical strength parameters, suggesting relatively stable ground conditions. The internal friction angle also increases with depth and material density, with hard rock zones showing the highest values. These findings contribute to the understanding of soil behavior in Bengkulu City and offer valuable insights for geotechnical engineers, urban planners, and disaster mitigation authorities. The spatial analysis of soil strength parameters provides a foundation for more resilient infrastructure planning and can be used as a reference for similar studies in other high-risk seismic regions.
Descriptive Study of Infiltration Well Design and Utilization in Sleman Regency, Special Region of Yogyakarta Hartadi, Arhad; Supraba, Intan; Kamulyan, Budi
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.80157

Abstract

In Indonesia, household-scale infiltration wells serve dual functions: managing rainwater and acting as secondary treatment systems for domestic wastewater from septic tanks. These roles require distinct designs, particularly in the arrangement and thickness of filter media. According to Indonesian technical standards (SNI – Standar Nasional Indonesia), wells designed for septic tanks use thicker, multi-layered filters that occupy most of the well's volume, while rainwater wells typically feature only a thin filter at the base. This difference reflects the higher pollutant levels in septic tank effluent compared to rainwater. Direct interviews with housing contractors in Sleman Regency, involving 836 household samples, revealed that all households repurposed rainwater infiltration well designs for managing domestic wastewater. Such practices deviate from intended design standards, raising concerns about the effectiveness of the filtration systems in these wells for contaminant removal and their potential contribution to groundwater pollution. The study further examined correlations between population density, soil characteristics, and the design and usage patterns of infiltration wells. In densely populated areas, more complex systems are often employed to manage wastewater and rainwater efficiently in limited spaces. In contrast, simpler systems are more common in less populated areas. Additionally, regions with clay-rich soils require larger wells to accommodate slower infiltration rates, while areas with sandy soils need smaller wells due to higher infiltration rates. These findings emphasize the importance of aligning infiltration well designs with both their intended purposes and local environmental conditions. Properly designed systems that manage wastewater and rainwater separately can reduce the risk of groundwater contamination, promoting more sustainable water management practices.
Cost and Time Performance Evaluation of a Sports Hall Construction Project Using the Earned Value Method: A Case Study at Gunung Kidul Campus, Universitas Negeri Yogyakarta Pratiwi, Anik Nurul; Prihadi, Wisnu Rachmad; Al-Pashya, Muhammad Donny Reval
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.84089

Abstract

The main objectives in managing construction work involve controlling costs, ensuring quality, and meeting project deadlines. Construction projects are regarded as successful when they deliver outputs that satisfy predefined quality standards, are finished on time, and stay within the agreed budget. The Earned Value Method (EVM) is a valuable technique in project management for assessing both cost efficiency and schedule adherence throughout the project’s duration. Important indicators for this analysis include BCWP (Budgeted Cost of Work Performed), BCWS (Budgeted Cost of Work Scheduled), ACWP (Actual Cost of Work Performed), Schedule Variance (SV), Cost Variance (CV), Schedule Performance Index (SPI), Cost Performance Index (CPI), Estimated At Schedule (EAS), and Estimated Temporary Schedule (ETS). This research focuses on evaluating the performance of the Sports Hall Building construction project at Gunung Kidul Campus by applying the earned value method. The assessment emphasizes time scheduling and cost management to gauge how well the project progresses relative to its planned schedule and budget. The study’s findings reveal the current condition of both cost and schedule aspects of the Sports Hall Building project at Gunungkidul Campus, Universitas Negeri Yogyakarta. The data showed a positive cost variance, indicating that the project’s actual expenditures were less than originally planned.
Assessment Probability of Soil Liquefaction Potential Based on SPT Data with NovoLIQ Application Oktafiani, Pradyta Galuh; Sasmayaputra, Nur Alfian
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.78664

Abstract

Liquefaction is a geological phenomenon that occurs when soil loses its strength due to a shock, such as an earthquake, and becomes semi-liquid. Liquefaction usually occurs in water-saturated sandy soils that are subjected to seismic stress. During an earthquake, the pore water pressure in the soil increases, causing the soil grains to lose contact with each other and resulting in the soil becoming unstable and behaving like a liquid. This process can have serious impacts on building structures and the infrastructure above them, such as foundation shifts, building tilting, and structural collapse. The Kulonprogo area is one of the areas that has a variety of soil types ranging from silt to sandy with a shallow groundwater table and is one of areas that according to BMKG, the Kulonprogo area is included in the area that has the potential to be affected by megathrust. Seeing from this, the Kulonprogo area has a high liquefaction potential. Based on this, this research will calculate the liquefaction potential in the Kulonprogo area using soil Cone Penetration Test data. Cone Penetration Test testing is carried out to a depth of 30 meters to evaluate the characteristics of soil layers and obtain N-SPT values that reflect the density and strength of the soil in each layer. The results of SPT testing at depths of up to 30 meters show a variety of soil types ranging from low plasticity silt in the upper layers to sand. The results obtained obtained the CRR value on average at each depth is 0.4 with SF between 1.04-1.68 which has a Liquefaction potential according to Youd and Nobel's theory of 80.2% and according to Centin's theory of 100%. This makes the Kulonprogo area have a high potential for Liquefaction, especially if a megathrust earthquake occurs.

Page 2 of 2 | Total Record : 14

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