Indonesian Geotechnical Journal
As all geotechnical engineers are aware of, soil behaviour can vary significantly from places to places. Design methodologies available in existing literature, especially on correlations of soil investigation and soil parameters, may not apply to local conditions. It is necessary to tailor well-established knowledge to the geotechnical problems related to Indonesia. The Indonesian Geotechnical Journal aims to address this problem by providing an open-access peer-reviewed journal. This journal provides a platform for authors to publish their state-of-the-art knowledge for practicing engineers as well as the academic society. Although the Indonesian Geotechnical Journal is intended to provide an outlet for Indonesia geotechnical research, suitable contributions from other countries will be most welcomed. Indonesia has a very complex geology, a meeting point of two continental plates and two oceanic plates. This means that the soil conditions in different part of Indonesia can vary greatly. Being at the meeting point of tectonic plates also mean that Indonesia, in addition to earthquake prone, has hilly and mountainous terrains. Further aggravating the conditions, Indonesia has a tropical climate, meaning high rainfall. Hilly terrain with high rainfall and earthquake is a recipe for slope failures. Mitigation of slope failure is something sought throughout Indonesia. Indonesia also has significant soft soil problems, with the fast-paced development of infrastructure in the recent years, various ground improvement techniques were adopted. The success and not so successful stories can be shared through the Indonesian Geotechnical Journal. Allowing exchange of knowledge and experience to enable engineers to build a better Indonesia. The scopes of topics include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, bio-geotechnics, Geotechnical earthquake engineering, liquefactions, waste management, geosynthetics, offshore engineering, risk and reliability applications, physical and numerical modelling, and case-history.
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<![CDATA[Comparison Study of Embankment Filled with Selected Material and Foamed Mortar on Toll Road ]]>
<![CDATA[Yudhi Lastiasih]]>;
<![CDATA[Indrasurya B. Mochtar]]>
<![CDATA[ Indonesian Geotechnical Journal Vol. 1 No. 2 (2022): Vol.1 , No.2, August 2022 ]]>
Publisher : <![CDATA[Himpunan Ahli Teknik Tanah Indonesia ]]>
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DOI: 10.56144/igj.v1i2.1
<![CDATA[The road studied was planned to be constructed on an embankment with a height ranging from 3 to 12 meters. It also has compressible soil conditions at a thickness of ± 10 meters and an average N-SPT value ranging from 5 to 12 which indicates a relatively large soil compression. Therefore, it is necessary to design a road embankment that meets the standard safety factor by using lightweight materials to minimize the occurrence of subgrade compression. The effect of gravel and foam mortar materials on the settlement and stability of the embankment was determined using 4 combinations including 100% gravel, 25% foam mortar with 75% gravel, 50% foam mortar with 50% gravel, and 75% foam mortar and 25% gravel. The findings showed that the combination with higher content of foam mortar has a smaller settlement and overall stability considered to be safe. It was discovered that the combination of 75% foam mortar and 25% gravel was able to reduce the settlement up to 0.6 times and increase the average safety factor up to 1.46 times. This combination was found to have the best results with consolidation settlement (Sc) of 1,24 m and Safety Factor (SF) of 1,383 for STA 414+525 while the values for STA 424+576 were 0,42 m and 2,78, respectively.]]>
<![CDATA[Lower Bound Capacity of Strip Footings on Rock Masses with Two Discontinuity Sets ]]>
<![CDATA[Widjojo Adi Prakoso]]>
<![CDATA[ Indonesian Geotechnical Journal Vol. 1 No. 2 (2022): Vol.1 , No.2, August 2022 ]]>
Publisher : <![CDATA[Himpunan Ahli Teknik Tanah Indonesia ]]>
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DOI: 10.56144/igj.v1i2.10
<![CDATA[This paper presents a lower bound model for predicting the rock strip footing bearing capacity. The model is based on strip footings on rock masses with two sets of ubiquitous, closed discontinuities. The model considers explicitly the strength of the intact rock and the discontinuities, as well as the number and orientation of the discontinuities. The validation of the model is presented. The parametric study of footings on rock masses with two discontinuity sets having the same strength is performed, and the results are reported graphically in detail. The bearing capacity is controlled primarily by the rock structures (number of discontinuity sets and orientation) and the discontinuity strength, and it is controlled by the intact rock strength for a very limited number of cases. The minimum bearing capacity factor is independent of the intact rock friction angle, but it is a linear function of discontinuity cohesion. The bearing capacity factor is also presented in terms of its ratio to UCS; the ratio for the maximum bearing capacity is rather insignificantly affected by intact rock friction angle, and not linearly correlated to discontinuity cohesion. The bearing capacity factor for rock masses with low discontinuity strengths tends to be more sensitive to any variation in discontinuity orientation. There are some exceptions to the above points, suggesting that there would always be some rock mass conditions leading to unexpected rock footing bearing capacities and therefore good characterization processes of rock masses would always be essential. The practical significant of this study is briefly discussed.]]>
<![CDATA[The Effect of Wood Charcoal Powder and Pumice Powder on The Parameters of Shear Strength of Clay Soil ]]>
<![CDATA[Raisya Fithria]]>;
<![CDATA[Dyah Pratiwi Kusumastuti]]>
<![CDATA[ Indonesian Geotechnical Journal Vol. 1 No. 2 (2022): Vol.1 , No.2, August 2022 ]]>
Publisher : <![CDATA[Himpunan Ahli Teknik Tanah Indonesia ]]>
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DOI: 10.56144/igj.v1i2.14
<![CDATA[Soil as a foundation must have sufficient bearing capacity when receiving the load acting on it. However, not all soil types have these characteristics, especially soft clay. The problems encountered in soft clay for construction are generally large settlements and low bearing capacity. Overcoming the problem of lack of bearing capacity in soft clay can be done with improvements. A simple improvement is done by the chemical stabilization method. Chemical stabilization is carried out by mixing soft clay and other materials such as pumice powder and wood charcoal powder. Variations in the addition of these materials in the study were 2% and 4% pumice powder and 15%, 20%, and 25% wood charcoal powder. Based on the test results, it was found that the increase in pumice powder and wood charcoal powder caused changes in physical and mechanical parameters in the soil sample. For physical parameters due to the addition of pumice powder and wood charcoal powder, the water content and liquid limit values decreased, while the specific gravity values, plastic limits, and shrinkage limits in the soil samples increased compared to the original soil samples. Meanwhile, the mechanical parameters in terms of the unconfined compressive strength test, due to the addition of pumice powder and wood charcoal powder caused the value of the unconfined compressive strength (qu) and the undrained shear strength (su) to increase. The biggest change in the parameters of the unconfined compressive strength and undrained shear strength of the soil sample was found in the addition of 4% pumice powder and 25% wood charcoal powder with an increase of 15.58% compared to the original soil sample.]]>
<![CDATA[Two-Dimensional Finite Element Analysis of Piled Raft Coefficient Settlement Ratio on Clays ]]>
<![CDATA[Christian William Munaba]]>;
<![CDATA[Aswin Lim]]>;
<![CDATA[Arif Yunando Soen]]>
<![CDATA[ Indonesian Geotechnical Journal Vol. 1 No. 2 (2022): Vol.1 , No.2, August 2022 ]]>
Publisher : <![CDATA[Himpunan Ahli Teknik Tanah Indonesia ]]>
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DOI: 10.56144/igj.v1i2.15
<![CDATA[Nowadays, designing a piled raft foundation is challenging because the behavior is three-dimensional. For some engineers, a three-dimensional analysis might not be affordable due to more costly than a two-dimensional analysis. In this study, 2D Finite element analysis – axisymmetric was used to study the piled raft foundation. The pile diameter and pile length were varied to investigate the relation between piled raft coefficient and load-settlement. In addition, the load transfer mechanism between the raft part and the pile part in clayey soils is also examined. The results show the longer the pile and the larger the diameter, the greater the load carried by the pile and the smaller the settlement. Increase in pile length by 5 m, resulting in a load transfer of 2% to 6% from a raft to pile, and reduced settlement by 2% to 3%. Furthermore, A 0.5 m increase in pile diameter results in an 8% to 25% load transfer from a raft to pile, and a 2% to 7% reduction in a settlement. The soil consistency affects the load distribution and settlement of the pile-raft foundation system. The higher the soil consistency, the smaller the amount transferred to the pile, and the higher the effectiveness of the pile in reducing the settlement that occurs.]]>
<![CDATA[Investigation of Dynamic Compaction and Vibro-compaction to Mitigate Liquefaction: A Case Study ]]>
<![CDATA[Gouw Tjie Liong]]>
<![CDATA[ Indonesian Geotechnical Journal Vol. 1 No. 2 (2022): Vol.1 , No.2, August 2022 ]]>
Publisher : <![CDATA[Himpunan Ahli Teknik Tanah Indonesia ]]>
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DOI: 10.56144/igj.v1i2.16
<![CDATA[Liquefaction is one of the phenomena that can be triggered by an earthquake. Earthquake causes an increase in pore-water pressure in soil, reducing soil’s effective stress to zero or near-zero. In this state, the soil loses its strength and behaves like a liquid. This is known as liquefaction. When soil loses its strength, so it also loses its bearing capacity, causing damage or failure to structures. The soil type that is most prone to liquefaction is loose saturated fine sand. Such soil can be found in many of coastal areas in Indonesia. Indonesia is also one of the most earthquake prone countries in the world, hence liquefaction is one of the natural hazards that Indonesia has to face. Earthquake cannot be prevented, and its occurrence cannot be accurately predicted. Fortunately, liquefaction can be prevented by doing soil improvement to increase the sand density. The two most commonly used ground improvement techniques to increase sand density is dynamic-compaction and vibro-compaction. A case study from Aceh province, where both ground improvement techniques were used, is presented in this paper to compare the performance of dynamic compaction and vibro-compaction.]]>
