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All Journal Indonesian Geotechnical Journal
James Oetomo
PT JGC Indonesia
Earth & Planetary Sciences

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Rectifying an Excessive Vibration Issue in Shallow Foundation with Permeation Grouting: A Case Study James Oetomo; Rizky Satria Putranto
Indonesian Geotechnical Journal Vol. 1 No. 3 (2022): Vol.1 , No.3, December 2022
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2321.53 KB) | DOI: 10.56144/igj.v1i3.31

Abstract

Large vibrating machines are integral part of industrial facility. This paper describes the case example of excessive vibration, encountered in one of the machine foundations in such facility, as well as the corresponding rectification works. This vibrating machine was built on shallow foundation sitting on compacted sand fill layer; the foundation self-weight is more than eight (8) times of the equipment weight. The block foundation dimension is about 7.0 x 1.7 x 1.7 m3. The vibrating machine frequency (which sits above the foundation) is 450 rpm, with a relatively large impulsive cyclic load. In this paper, firstly, the potential root cause of this vibration issue is explored. Thereafter, considerations for the rectification works are described; in this case, a permeation grouting technique, using low-viscosity cement grout is chosen. The work method for this ground improvement works, including the completion criteria are described. Post-improvement vibration measurement indicates that the measured vibration is within the accepted vibration limit, indicating a successful improvement work.
Effect of Permanent Load in Gresik Alluvium on Friction Pile Embedment Depth James Oetomo; Ahmad Sulaiman; Ryan Achmad Fadhillah; Eka Diah Astuti
Indonesian Geotechnical Journal Vol. 2 No. 3 (2023): Vol. 2, No. 3, December 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i3.54

Abstract

Hydrostatic load, approximately 250-35 kPa (i.e., water of 2.5m-3.5m high), has been applied in the project area for about 25 years; hereafter, it will be referred as permanent load. Recently, this permanent load including its perimeter embankment, is demolished for which a new facility will be built. The upper 2-4m soil layer in this area consists of fill soil (mainly cohesionless material) overlying thick Gresik alluvium layer. A bearing layer was not found (down to an investigation depth of 50m). The initial design of pile embedment depth refers to the legacy soil report, pile embedment information from the surrounding area (not being subjected by permanent load), and preliminary soil investigation data (from the surrounding area); in this case, the projected embedment depth is 20-23m with the friction pile design concept. Due to the proximity of project location with existing facilities, the jacking-driven pile method, with HSPD (Hydraulic Static Pile Driver) machine, is selected for installing the precast spun pile. The pile jacking works indicate that piles can only be driven down to a depth of about 12m (far less than the projected depth). This paper provides an analysis on the changes of soil properties due to permanent load, which in turn increasing the pile shaft capacity and effectively reducing the pile embedment depth. The analysis is supported by data from pile jacking record, PDA test, and instrumented test pile. Discussion regarding the conservatism in pile design is also presented.
Co-Authors Ahmad Sulaiman Eka Diah Astuti Rizky Satria Putranto Ryan Achmad Fadhillah