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All Journal Jurnal Civronlit Unbari SIGMA TEKNIKA Civil Engineering Collaboration Jurnal Teknik Sipil Institut Teknologi Padang Civil Engineering For Community Development
Risayanti
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Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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Journal : civil engineering collaboration

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Potensi Likuifaksi Pasir Seragam Berdasarkan Tegangan Air Pori Dan Ukuran Butiran (Laboratory Model) Risayanti; Abdul Hakam
Civil Engineering Collaboration Vol. 7 (2022) No. 2
Publisher : Universitas Putra Indonesia YPTK Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35134/jcivil.v7i2.42

Abstract

Analisis untuk mengetahui potensi likuifaksi pada suatu deposit tanah dapat dilakukan melalui parameter tanah seperti ukuran butiran dan tekanan air pori. Penelitian ini bertujuan untuk mengetahui perilaku tanah pasir seragam terhadap kenaikan tekanan air pori akibat beban siklik serta potensinya terhadap likuifaksi akibat dari perubahan tekanan air pori tersebut. Sample yang diujikan adalah pasir seragam yang tertahan pada saringan #20, #40, #60, #100 dan #200 yang diambil dari uji ayakan, kemudian masing-masing sampel yang dalam kondisi jenuh dimasukkan dalam alat pengujian. Dari pengujian yang dilakukan pada pasir seragam dengan beberapa variasi ukuran butiran tanah diketahui bahwa saat beban siklik diberikan kenaikan tekanan air pori berbeda pada masing-masing ukuran butiran tanah. Perubahan tekanan air pori terbesar terjadi pada sampel pasir seragam berbutir halus yaitu tertahan pada saringan #100 dan #200 dengan perubahan sebesar 0,28 kg/cm2 dan 0,27 kg/cm2. Meningkatnya tekanan air pori tentu disertai dengan penurunan tegangan efektif tanah. Maka dapat diketahui bahwa sampel pasir seragam berbutir halus lebih berpotensi terjadinya likuifaksi yaitu sampel yang tertahan pada saringan #100 dengan pengurangan tegangan efektif 91,19% dan #200 dengan pengurangan tegangan efektif 89,66%. Sampel pasir seragam yang tertahan pada saringan #60 memiliki potensi likuifaksi yang lebih rendah dibandingkan dengan sampel yang berukuran lebih halus karena mengalami pengurangan tegangan efektif 58,47%, namun memiliki kecenderungan perubahan tekanan air pori yang cukup besar. Sampel pasir seragam yang tertahan pada saringan #20 dan #40, tidak memiliki potensi terhadap likuifaksi selama pengujian dilakukan. Tegangan efektif pada sampel ini berkurang sebesar 18,46% dan 32,31%.
The Effect of Lime Addition on Consistency and Maximum Stress in Silt-Clay Soil Risayanti; Farni, Indra; Zufrimar
Civil Engineering Collaboration Vol. 11 (2026) No. 1
Publisher : Universitas Putra Indonesia YPTK Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35134/jcivil.v11i1.88

Abstract

Silty–clayey soils with moderate to high plasticity often present geotechnical problems due to high compressibility, low bearing capacity, and sensitivity to moisture variations. This study aims to evaluate the effect of lime addition on soil consistency characteristics and maximum stress, and to investigate the quantitative relationship between the plasticity index (PI) and maximum stress (qu) as an integrated approach for assessing soil stabilization. Laboratory tests were conducted using lime contents of 0%, 3%, 5%, 7%, and 9% by dry weight of soil. The evaluated parameters included liquid limit (LL), plastic limit (PL), plasticity index (PI), and unconfined compressive strength (UCS). The results indicate that lime addition significantly reduced the plasticity index from 23.13% to 8.89%, accompanied by an increase in maximum stress from 0.119 kg/cm² to 0.291 kg/cm². Regression analysis revealed a strong negative linear relationship between PI and qu, with a coefficient of determination (R²) of 0.98. The optimum lime content was found to be in the range of 5–7%, providing the most efficient combination of plasticity reduction and strength improvement. These findings suggest that the plasticity index has strong potential to be used as a preliminary parameter for estimating strength improvement in lime-stabilized silty–clayey soils during the early stage of ground improvement planning.
Performance Evaluation of the RSUP Dr. M. Djamil Intersection, Jalan Perintis Kemerdekaan, Padang City Veronika Salmi; Dzikra Marsa Esmara; Eko Prayitno; Risayanti
Civil Engineering Collaboration Vol. 11 (2026) No. 1
Publisher : Universitas Putra Indonesia YPTK Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35134/jcivil.v11i1.94

Abstract

Rapid growth in the number of vehicles in Padang City has caused traffic congestion at critical locations, one of which is the Dr. M. Djamil General Hospital (RSUP) intersection. Although equipped with traffic signal infrastructure, the intersection currently operates as an unsignalized junction because the traffic lights are not in use. This study aims to evaluate existing performance and propose alternative solutions based on the 2023 Indonesian Road Capacity Manual (PKJI). Primary data were obtained through field surveys conducted over four days during morning, midday, and evening peak periods. Analysis of existing conditions during the evening peak hour (Saturday, 17:00–18:00 WIB) revealed a degree of saturation (DS) of 0.89 and an intersection delay of 15.34 seconds/vehicle, corresponding to Level of Service C (stable flow, moderate density). Three alternative solutions were examined: installing traffic signals (3-phase), widening the major road combined with traffic signals, and widening the major road without traffic signals. Comparative results indicate that Alternative Solution 3 (widening the major road by 1 meter without traffic signals) is the most effective, yielding a DS of 0.87, a delay of 14.84 seconds/vehicle, and Level of Service B.
Co-Authors Abdul Hakam Aprilla Yunita Dzikra Marsa Esmara Edwina Zainal Eko Prayitno Eko, Pra yitno Farni, Indra Nori Yusri Rita Anggraini Triwahyudi, Raja Nurrahman Veronika Veronika Salmi Veronika Veronika Zufrimar Zufrimar, Zufrimar