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All Journal Civil Engineering Forum Teknik Sipil Inersia : Jurnal Teknik Sipil dan Arsitektur Journal of the Civil Engineering Forum Jurnal Tekno Global Journal of Applied Geology Journal of the Civil Engineering Forum Jurnal Indonesia Sosial Teknologi
Hary Christady H.
Department Of Civil And Environmental Engineering, Faculty Of Engineering, Universitas Gadjah Mada, Yogyakarta 55281, INDONESIA
Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Social Sciences

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Journal : Journal of the Civil Engineering Forum

 1 
Parametric Study of the Effect of Ground Anchor on Deep Excavation Stability Aditya Putra Pratama; Hary Christady Hardyatmo; Fikri Faris
Journal of the Civil Engineering Forum Vol. 6 No. 1 (January 2020)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (465.392 KB) | DOI: 10.22146/jcef.47514

Abstract

Apartment construction is mostly carried out by including deep excavation works. However, excavation causes land instability; hence, the work needs to be done by a particular handler. In some cases, deep excavation is carried out on soft soil, which has a very high level of soil instability; therefore, a specific handling method such as ground anchor is required as an alternative. This study aims to conduct parametric research on the effect of using anchors on the stability of deep excavation. First, anchors of various slopes were modelled while varying the number of anchors up to four pieces. From the results of the study, the requirements representing the most efficient use of anchors were selected, and then various anchor bond lengths were modelled. Finally, the effect of applying various magnitudes of prestress forces to the anchor was determined. All of the models were examined to determine the influence on the stability of the deep excavation by observing the horizontal displacement and the forces that occur on the secant pile. From the analysis results, it can be concluded that the most effective slope angle is 0°. The displacement and forces occurred in the secant piles on the use of two, three, or four anchors has not a significant difference. The application of a higher prestress force on the anchor would yield better results as long as it is not exceeding 200 kN. However, in the case of an apartment building’s plans in Surabaya, the optimal anchor usage was found to be the use of two anchors with a 45° slope, 4.5 m for the first (A) and second (B) anchor bond lengths, 15 m free length anchor, 2.5 m vertical anchor distance, 1.2 m horizontal anchor distance, and the application of 200 kN prestress force.
Effect of Well Resistance on Time Factor Ratio Due to PVD Deformation Galuh Chrismaningwang; Hary Christady Hardiyatmo; Agus Darmawan Adi; Teuku Faisal Fathani
Journal of the Civil Engineering Forum Vol. 7 No. 3 (September 2021)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.64381

Abstract

One of the most common soft soil enhancement techniques used to expedite the consolidation time significantly is Prefabricated Vertical Drains (PVD). This technique needs a sufficient discharge capacity value because it primarily functions as a drainage channel. The deformation of PVD is considered as one of the primary factors which affect discharge capacity. Therefore, this research determined the influence of upper-side deformation on PVD's discharge capacity (qw) using a specific design apparatus known as ASTM D4716, which manages the determination of transmissivity and flow rate at the longitudinal direction of geosynthetics. Furthermore, two PVD samples with dimensions of 3 and 4 mm thickness, 100 mm width, and 1000 mm length were examined under straight and buckled conditions. Stepwise confining pressures from 50 to 200 kPa were subjected to the samples under hydraulic gradients with values of 0.2, 0.5, and 1.0. The results showed that samples with greater thickness had higher discharge capacity, which significantly reduced in the lower hydraulic gradient. The deformation on the upper side of PVD induced a decrease of discharge capacity by approximately 13-16%, which led to a delay in the consolidation time. The discharge capacity values obtained from the experiments were employed as parameters in a time factor ratio of Th,w/Th. The analysis results show that the buckled PVD has a more considerable consolidation time due to the increase in the Th,w/Th ratio, with a discharge capacity value below 10-4 m3/s. It can be concluded that the deformation in the form of buckled conditions on the upper side of PVD had a considerable impact on PVD effectiveness.
Co-Authors Aditya Putra Pratama Agus Darmawan Adi Agus Darmawan Adi Ahmad Rifa’I Andreas Triwiyono Aulia Muttaqin Bambang Suhendro Dwikorita Karnawati Ekasisca Contesa Faris, Fikri Ferry Hariman Galuh Chrismaningwang Hadi Wira Nasarani Ignatius Christiawan Iman Satyarno Isti Radhista Hertiany Marsuki M. Marsuki M. Meylani Nurul Hidayah Mitsaq Addina Nisa Muh. Subhan A.K. Purbolaras Nawangalam Raudah Ahmad Srijono Srijono Taqia Rahman Teuku Faisal Fathani Wardhani Sartono Wardhani Sartono Winarti, Dwi Yogha Caniggia