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All Journal Media Teknik Sipil Jurnal Mahasiswa Jurusan Teknik Sipil Journal of Degraded and Mining Lands Management Indonesian Green Technology Journal Jurnal Pembangunan dan Alam Lestari Rekayasa Sipil
Arief Rachmansyah
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Engineering Other

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Journal : Rekayasa Sipil

 1 
AN ANALYSIS OF CRITICAL SLOPES STABILITY IN BENDOSARI VILLAGE, PUJON, MALANG DUE TO THE EFFECT OF RAINWATER INFILTRATION Nindia Rizky Ismawan; Eko Andi Suryo; Arief Rachmansyah
Rekayasa Sipil Vol. 16 No. 1 (2022): Rekayasa Sipil Vol.16. No.1
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2022.016.01.7

Abstract

A disaster is an incident which threatens and disrupts life. This research was purposed to determine the critical slope stability in Bendosari Village, Pujon due to rainwater infiltration. This research was conducted through ground laboratory test to investigate the type and characteristic of the soil, which then followed by testing of the geo-electric and topography to investigate the existing condition and the ground water level on the critical slopes and analyzed safety factor (SF) using SLOPE/ W for slope with rainwater infiltration effect. The analysis results proved that rainwater infiltration in both conditions could reduce the SF (Safety Factor) value. This is because the water content in the soil increased the pore water pressure. In addition, high water content in the soil reduced the soil shear strength
Evaluasi Kinerja Perbaikan Tanah Lunak Dengan Menggunakan Preloading dan Prefabricated Vertical Drain (PVD) Zahra Febrina Lilabsari; As'ad Munawir; Yulvi Zaika; Arief Rachmansyah
Rekayasa Sipil Vol 12, No 2 (2018)
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2018.012.02.6

Abstract

The settlement of soil consolidation is geotechnical problem which is often found in soft soil accumulation. It is therefore, Preloading and Prefabricated Vertical Drain techniques are used to accelerate consolidational settlement. The problem which often appeared in using Preloading and Prefabricated Vertical Drain (PVD) is the failure of design. It causes the consolidationtime cannot run in accordance with the planning. In order to have soil improvemet method which has high effectiveness it is necessary to evaluate the use of geotechnical instruments. In this study, the evaluation covers 3 (three) geotechnical instruments, where Settlement Plate is used to evaluate theoretical settlement, to calculate final settlement prediction with Asaoka observation method and consolidation degree in the field. Consolidation degree also can be evaluated using Pneumatic Piezometer instrument. The inclinometer is used to evaluated the stability of embankment. The failure of design in using Preloading and Prefabricated Vertical Drain (PVD) can be accured because of the mistake of planner in determaining soil design parameters, therefore this study also discusses soil design parameters in actual condition using back analysis method. The results obtained in this study are comparison of actual and theoretical settlement on average of 0.862. To predict final settlement it can be obtained the value 2191,08 mm with the rest of settlement which will be accured about 100 – 450 mm. In this study the actual consolidation degree from Piezometer reading is 85,36% and Settlement Plate reading is 88,42% with the difference of 3,06%. From Inclinometer reading lateral shift which is accured below the soil there is no land slide so that the embankment which is used remains safe The result of back analysis method is Ch value where the new Ch value is 1,914Cv.
Pengaruh Penambahan Abu Ampas Tebu dan Kapur Terhadap Karakteristik Tanah Lempung Ekspansif (Studi Kasus : Tanah di Bojonegoro) Yanwar Eko Prasetyo; Yulvi Zaika; Arief Rachmansyah
Rekayasa Sipil Vol 12, No 2 (2018)
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2018.012.02.7

Abstract

In each region having different types of soil, one type of soil is expansive clay. In Indonesia, more than 1/5 of the land area in Indonesia are an expansive clay. This type of soil will affected by changes in water content and experience significant shrinkage. Therefore, to improve the soil and minimize shrinkage growth, an effort is needed, one of which is soil stabilization. Physical testing of soil with soil samples in the district Ngasem, Kab. Bojonegoro which is expansive clay soil shows that the CBR value is 3.953%, and the swelling value is 6.1858%. With such physical conditions with low carrying capacity it is necessary to stabilize the soil on clay in Bojonegoro. Stabilization efforts carried out are by chemical stabilization by mixing soil samples with additives in the form of bagasse and lime ash. The results of the physical soil test from the preliminary research conducted by the author by mixing bagasse ash in the soil with variations in levels of 8%, 10%, 12%, 14% showed a mixture of 8% bagasse ash was the optimum level for repairs to the soil. So it is used a mixture of 8% bagasse ash with the addition of variations in lime content of 4%, 6% and 8% of the total weight of the mixture. A mixture of 8% bagasse ash and 6% lime content produced a CBR value of 9,324%, this CBR value increased to 135.87%. While the swelling value is 0.1681%, with the same mixture level. This swelling value decreased to 97.28%. For the value of free development it decreased to 217.7% from the previous one which amounted to 70.59% to 22.22%.
ROCK SLOPE STABILITY OF PONOROGO - PACITAN ROAD KM 232.5 USING ROCK MASS RATING (RMR) AND ROCPLANE SOFTWARE Hasyim Alhadar; Arief Rachmansyah; Eko Andi Suryo
Rekayasa Sipil Vol 15, No 3 (2021)
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

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

Abstract

Geological structures and discontinuities in the rock are weak areas and groundwater infiltration pathways. The existence of geological structures and discontinuities will reduce the level of rock shear strength and the main implication is to increase the chance of landslides. The purpose of this study was to determine the type of sliding on rock slopes, rock mass classification, and to determine the stability of the rock slopes. Kinematic analysis obtained landslide type, rock mass classification analysis including medium rock mass class with an RMR value of 53. Slope stability analysis based on the generalized criteria Hoek & Brown failure obtained a safety factor value of 1.55 with a slope angle of 60°. Slope stability analysis based on Mohr-Coulomb criteria obtained a safety factor value of 1.59 with a slope angle of 70°.
A Fuzzy Approach on Earned Value Method to Evaluate Project Performance in Solojebres Commuter Depot Ahmad Kahfi Firdausi; M. Ruslin Anwar; Arief Rachmansyah
Rekayasa Sipil Vol. 18 No. 3 (2024): Rekayasa Sipil Vol. 18 No. 3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2024.018.03.3

Abstract

The high level of public interest in using the Solo-Jogja commuter needs to be accompanied by an effort to improve the services and reliability of facilities, one of which is the establishment of a Commuter Depot located at Solojebres Station. In the 18th month of work, the construction of the Commuter Depot experienced delays in work performance with a deviation between plan progress and actual progress of -3.5415%. This research aims to evaluate project performance, including the project's cost and schedule performances, and estimate the cost and schedule of the project at completion due to delays that occur using the Earned Value Method with a fuzzy approach. The required data are the Budget Plan, Weekly Project Report, S-curve, and Actual Cost data. Based on the analysis result, until the 18th month of work, obtained the total Planned Value of IDR 64,581,925,585 (simplified to IDR 6,458.2), the total Actual Cost of IDR 63,954,955,399 (simplified to IDR 6,395.5), the total Fuzzy Earned Value of IDR 62,740,381,379.42 (simplified to IDR 6,274.0), the Cost Performance Index indicates that the project is ahead of budget condition, the Schedule Performance Index indicates that the project is behind schedule condition, the Cost Estimate at Completion of IDR 96,048,508,686 with the cost needed to complete the rest of work of IDR 32,093,553,287 and the Schedule Estimate at Completion of 27.03 months with the time required to complete the rest of work of 9.03 months.
Rainfall-Induced Slope Stability on Soil-Rock Mixture Adefi Abioga; Arief Rachmansyah; Yulvi Zaika
Rekayasa Sipil Vol. 19 No. 1 (2025): Rekayasa Sipil Vol. 19 No. 1
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2025.019.01.11

Abstract

Many landslides are caused by rainfall, and antecedent rainfall plays a major role in slope failure. The landslide in Bululawang, Blitar, is one example of a slope that failed during a rainfall event. The stratification of the rock and soil in this area is complicated. There are several blocks of rock and clay-based soil in the landslide region, along with limestone. This study aims to examine how rainfall affects rock-mixed soil. Electrical resistivity tomography (ERT) was conducted to model the slope stratification combined with boring to verify the results. Soil properties mixed with rock (SRM) were estimated by rock block proportion on the slope. A transient model of slope stability analysis was created using the SEEP/W program to simulate slope seepage and SLOPE/W to compute slope stability. Following the antecedent precipitation, an extreme rainfall event occurred. The findings demonstrate how the slope in Bululawang Blitar is affected by antecedent rainfall, affecting the slope's initial state before applying intense rainfall. The elevation of the groundwater level and the pore water pressure on the slope are altered by antecedent rainfall. When examined, this phenomenon will impact the slope's safety factor. The slope safety factor (FoS) was reduced by 31.48% from 1.542 to 1.057 in the event of extreme rainfall, which does not satisfy the requirement for a slope safety factor of 1.25. The slope design utilizing a counterweight can optimally elevate the slope safety factor (FoS) from 1.057 to 1.461, which exceeds the required value of 1.25. SRM-type soil possesses high permeability, resulting in a rapid decline in the stability value of the slope in the event of extreme rainfall. Consequently, an early warning system tool is necessary to alert against landslide hazards.
Co-Authors A.A. Ketut Agung Cahyawan W Adefi Abioga Ahmad Kahfi Firdausi Aminudin Afandhi anita febrianti Arfandi, Hendrojati Arief Riyadi As'ad Munawir As’ad Munawir Azarine Nabila Jifa Bagyo Yanuwiadi Brian Rahardi Deddy Sugianto Dwi Prihanto Eko Andi Suryo Eric Ramadhani Asharil Putra Fadly Usman Halimah Rahman Hamid Syarif Hidayatullah Harimurti Harsuko Riniwati Hasyim Alhadar Isadur Rofiq Lasmini Ambarwati Luchman Hakim Ludfi Djakfar M. Ruslin Anwar Muhammad Adiethya Ekaviandra Muhammad Rizky Pratama Muhammad Royhan Ferdiansyah Muhammad Taufani Satriagung Nindia Rizky Ismawan Ridlo Febrian Firdianggi Rindra Desta Vionanda Rita Parmawati Rizkishoiful Kodri Tarigan, Robertho Augus Zianta Tuhepaly, Achmad Fahmi Wiratsongko, Rahmad Prasetyo Yanwar Eko Prasetyo Yulvi Zaika Yulvi Zaika Zaenal Kusuma Zahra Febrina Lilabsari