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INDONESIA
Indonesian Geotechnical Journal
Published by Himpunan Ahli Teknik Tanah Indonesia
ISSN : -     EISSN : 28297520     DOI : https://doi.org/10.56144/igj.v1i3
Core Subject : Science,
Earth & Planetary Sciences
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.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Teknik Geologi dan Geologi Teknik
Articles 49 Documents
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The Improvement of Ultra-Soft Soil Using Prefabricated Vertical Drain with Vacuum Preloading System: Laboratory Model Study Pio Kefas; Andreas Erdian Wijaya; Ginanjar Khaq; Marcello Djunaidy
Indonesian Geotechnical Journal Vol. 2 No. 2 (2023): Vol.2 , No.2, Agustus 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i2.38

Abstract

Use of Prefabricated Vertical Drain (PVDs) to improve ultra-soft soil by vacuum preloading method on laboratory scale is described in this study. The laboratory model will be carried out in a vacuum chamber 1m x 1m x 1m with 1 (one) PVD in the middle which is connected to the vacuum pump. During vacuum preloading test, 3 (three) units of settlement plates will be monitored until 60 days. As a comparison data on soil conditions, a test will be carried out by taking 2 (two) samples to see the distribution of differences in the properties condition of ultra-soft soil before and after vacuuming and its relationship with the settlement. Laboratory test shown properties changes which the soil nearest PVD has the bigger changes compared to soil farther from PVD. The change in unit weight (g) based on the sample distance of 15cm and 45cm from the PVD was an increase of 16.47% and 9.59%, respectively. While the change in natural water content (wn) was down 92.81% and 34.47% respectively. Meanwhile, the results of the permeability test showed a decrease of 97.05% and 85.77%, respectively.
Coherence Alarm Implementation upon Post-Blast Impact in Open-Pit Mine Muhammad Adib Izzuddin; Alden Sinai Yudono; Deaz Dewantara
Indonesian Geotechnical Journal Vol. 2 No. 2 (2023): Vol.2 , No.2, Agustus 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i2.39

Abstract

Slope Stability Radar (SSR) is a geotechnical monitoring tool, an array of sophisticated technology which is equipped with features that could be utilized in dynamic mining conditions. One of the features is called coherence and is used to track the impact of blasting activity around the research area. Historically, it has been recorded that fall-of-ground event (bench-scale failure) had occurred after blasting activity around the research area. These two events were recorded perfectly by utilizing coherence attribute measurement, including the time of event and the dimension of the impact area. Therefore, the application of a coherence alarm could be one of the solutions to provide an immediate response to track the blasting impact and provide periodic notification in case of the similar things occurred in the future. There are two alarm parameters in which required some adjustments due to the sensitivity of coherence attribute. The first one, is the alarm mask. It masks out the expected unwanted triggering alarm, such as vegetation area, ramp, machinery area, and mining infrastructures. The second one is the alarm threshold. It requires precise adjustment to maximize the alarm function during the rainfall event. The analysis resulting the threshold values advocated for the alarm are 12 contiguous pixels, 2 scans, and 0.6 coherence value. The alarm configuration parameters are then applied to the coherence alarm system. Notwithstanding that matter, the alarm configuration requires periodic adjustments, accompanied by the competencies of the person in charge for the SSR to be able to comprehensively understand the concept of coherence and its implementation in the research area.
Applicability of Soybean Crude Urease-Calcite Precipitation Method in Various Liquefiable Sandy Soils Akbar Renaldi Loebis; Heriansyah Putra
Indonesian Geotechnical Journal Vol. 2 No. 2 (2023): Vol.2 , No.2, Agustus 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i2.40

Abstract

Liquefaction is a process in which pore-water pressure generated in the soil, usually by earthquake, is equal or almost equal to the total stress in the soil. This process reduces the effective stress to zero or near-zero, leading to reduction in shear strength and stiffness of soil. Hence, when liquefaction occurs, structures above and within the liquified soil, buildings, bridges, tunnels, docks, underground pipelines, and many other structures can get damaged. Soils which are susceptible to liquefaction are granular soil such as sand and silt. One of the methods that can be adopted to prevent liquefaction is soybean crude urease-calcite precipitation. This method uses urease enzyme in soybean crude as a biocatalyst to hydrolyze urea to produce carbonate ions and ammonium ions. In the presence of calcium ions, the carbonate ions react to produce calcium carbonate (calcite) precipitate. This research investigates the applicability of soybean crude urease-calcite precipitation method to improve various liquefiable sandy soil (fine, medium, coarse sand) at different relative density (40-60%). The soil strength after improvement was evaluated by using unconfined compressive strength (UCS) test, while calcite content was measured using acid leaching method. The results of the UCS test and calcite content analysis varies depending on the type of sand and relative density. The UCS value obtained from medium sand is higher than 50 kPa, potentially sufficient to prevent liquefaction. However, treatment on coarse sand failed to develop UCS, whereas treatment on fine sand produces limited UCS (< 10 kPa).
Identification of Vulnerability Due to the Pasaman M6.2 Earthquake on 25 February 2022 Using Satellite-Based Methods and Field Surveys
Indonesian Geotechnical Journal Vol. 2 No. 2 (2023): Vol.2 , No.2, Agustus 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i2.43

Abstract

The Pasaman earthquake which occurred on 25 February 2022, with a magnitude of 6.2, caused casualties and infrastructure damage. Vulnerability identification determines the potential extent to which a system or unit tends to be damaged. Vulnerability identification in this study was carried out based on four vulnerability indicators, namely: rate of soil movement from satellite image processing, soil type classification based on Vs30, corrected isoseismal shakemap, and residential area maps. Each indicator, with their respective weightage, is then scored and summed to evaluate the vulnerability of areas in the vicinity of Pasaman earthquake. The processing of Sentinel-1 SLC satellite data using the advanced Differential Interferometric Synthetic Aperture Radar (DInSAR) produces a deformation rate around area of epicenter. Areas that have high vulnerability generally have a value of ground movement rate in the form of subsidence above 5 cm/year. These areas were predominantly residential and experienced significant damage during the earthquake. The soil type in these regions was classified as medium soil, and the intensity of shocks during the earthquake was categorized as VI MMI or higher. This study was conducted in the area near the epicenter of the Pasaman earthquake, such as in the district Pasaman, Bonjol, Pasaman, Palembaya, and Lubuk Basung. A study of disaster vulnerability identification is carried out to reduce the losses and minimizing the exposure of the population to disasters. The results of vulnerability identification can be used as part of education and literacy to reduce the risk of earthquake disasters.
Common Mistakes in Execution of Plane Load Test Anthony Gunawan
Indonesian Geotechnical Journal Vol. 2 No. 2 (2023): Vol.2 , No.2, Agustus 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i2.53

Abstract

Shallow foundation is the preferred foundation whenever possible, as it is economically more feasible compared to deep foundation. The design method for shallow foundation has long been established by Terzaghi. The Terzaghi’s bearing capacity equation requires soil strength parameters for its calculation. To obtain accurate results, undisturbed sample for laboratory testing is necessary. However, depending on the accuracy of soil sampling and laboratory testing, the results can have large inaccuracy. The in-situ determination of shallow foundation can be carried out by plate loading test. It is a well-established test which was standardized by British Standards in 1990 and American Society for Testing and Materials in 1994. The testing method is simple, and the standards provide flexibility in the execution of the test. Unfortunately, this flexibility can cause mistakes in the execution of the test, as practitioners can be selective in choosing the test procedure to minimize the test duration and/or cost. These mistakes can cause the plate load test results to be unusable or lead to erroneous results. This paper aims to address common mistakes in execution of plate load test.
Laboratory Study of Grouting Method to Improve Loose Sand Against Liquefaction Cindarto; Paulus Pramono Rahardjo; Imam Achmad Sadisun
Indonesian Geotechnical Journal Vol. 2 No. 2 (2023): Vol.2 , No.2, Agustus 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i2.68

Abstract

Liquefaction is a phenomenon when soil behaves like liquid during earthquake, and only occurs in saturated loose fine sand with grain size ranging from 0.2 to 0.02 mm. Liquefaction can be devastating, causing failure and deformation to buildings, roads, and bridges. Thus, research study on the application of grouting method for improving liquefiable fine sand in the laboratory is carried out. Grouting is a soil improvement method that injects cementing agent into a soil mass. After the grout has solidified, the soil density and consistency of the soil will improve. This research proves, mathematically and experimentally, that grouting can improve the density and consistency of liquefiable sand, thus reducing the liquefaction potential. Grouting liquefiable saturated sand basically compacts the soil, leading to consolidation as soil pore-water is dissipated during the grouting process. It is found that the volume of grout per unit volume of soil mass treated is directly proportional with the reduction of void ratio and increase in soil density.
Evaluation of Consolidation Degree from CPTu using Rahardjo (2016) Method – Case Study of Consolidating Soil in East Kalimantan Edwin Lie
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.v2i3.44

Abstract

A geotechnical investigation comprised 13 CPTu and 23 dissipation testing were performed on a site in East Kalimantan due to landslide triggered by 15 to 30m thick soft clay underlying 75m high overburden embankment. The investigation covers an area of about 250m x 275m wide on the area next to the toe of the embankment. From geological map, the site situated at borders of Balikpapan Formation (Tmbp) and Kampung Baru Formation (Tpkb) with Alluvium (Qa) formation from Heliosen period nearby. Measurement from penetration showed high pore-water pressure higher than the hydrostatic pressure. Result from dissipation testing showed that the soft clay is still consolidating with residual excess pore pressure (uf) still exist. Rahardjo (2016) Method was developed using CPTu data as its basis especially soft clay data to determine overconsolidation ratio (OCR). However, it can also be used to determine the degree of consolidation. The method uses Pore Pressure Ratio (Bq) value, excess pore pressure divided by net cone resistance – Bq = Δu/(qt – σv0), which was obtained when performing CPTu test. The formula proposed was 1/(1.2Bq+0.1). The method stated that the value of Bq=0.75 equals to OCR=1 which is showing a normally consolidated clay. Bq value higher than 0.75 will show a degree of consolidation of a consolidating soil and for Bq value lower than 0.75 will show an OCR value of overconsolidated soil. Applying Rahardjo (2016) Method to the dissipation data performed showed an agreement on soft clay where the soil is still consolidating. However, when applied to over consolidated soil near surface this method will show a greater OCR value.
Ground Penetrating Radar Signals, An Efficient Way to Estimate Fouled Ballast Raihan Valentino Jaya Saputra; Chiping Kuo
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.v2i3.45

Abstract

Mud pumping is a serious problem in railroad structures. Mud is often found in ballast structures, which can decrease the lifespan of sleepers and rail structures. Currently, the role of ground penetrating radar in investigating ballast condition is more useful than visual inspection. Ground penetrating radar can see the condition inside the ballast with the reflection of high-speed electromagnetic waves. One of the outputs from the ground penetrating radar is the graph of the signal reflection strength. Electromagnetic waves in ground penetrating radar have different reflectance strengths depending on the interfaces between different materials they pass through. For example, water-like material has a stronger signal reflection strength than gravel and soil. There are different colors used to indicate the level of signal reflection strength. Bright colors indicate a stronger level of signal reflection strength compared to dark colors. It has already been found that the dark colors of the scanning results are fouled ballast, respectively. To interpret fouled ballast conditions on the ground penetrating radar output graph, it is necessary to sort out the different colors. Therefore, this study aims to utilize design software to facilitate color selection on the ground penetrating radar output graph and determines the estimation of fouled ballast.  
Type of Rockslide along the Ponorogo – Pacitan Roads, East Java, Indonesia Arief Rachmansyah; Faridha Aprilia
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.v2i3.47

Abstract

The Pacitan Regency, located in the southwestern part of East Java Province, is one of the areas with low economic growth. Difficult accessibility is one of the reasons for the slow development of this region. To reaching the Pacitan Regency it can take through the Ponorogo – Slahung – Arjosari - Pacitan roads. Based on the geological condition most of roads are built on geologic formations composed of Oligocene - Miocene volcanic and intrusive rocks. Mass movement often occurs along roads and disturbs the transportation of goods and people. This paper discusses the types and mechanisms of slope failure along roads. Recognizing these two aspects of slope failure plays important role to treat them. The field survey identified 13 landslide zones with a 50–200 m bright. Based on rock type, weathering and alteration levels, and geological structure, slope failure can be classified into three types. First, the wedge rockslide  occurred on the low-altered dacitic lapilli tuff. The planar – toppling type of rockslide occurred in the residual soil of the andesitic basalt lava with columnar and sheeting joint. Third, complex circular debris slides occur in highly jointed and altered dacitic intrusive rocks, which contain a large amount of clayey material. The third slide type that occurred at km 226 requires further research with an interdisciplinary approach because of moving the 200-meter-long road mass.
Statistical Analysis of Core Strength of Deep Cement Mixing Ground Tsutomu Namikawa
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.v2i3.48

Abstract

Cement-treated ground by deep cement mixing has been used for several geotechnical structures widely. In quality assurance processes of this method, statistical parameters, mean and standard deviation, of unconfined compressive strength of cement-treated soils are used. The mean and standard deviation are normally used to assure the quality of the improved ground. These parameters evaluated from core strength data are the sample statistical parameters, indicating these parameters involve the statistical uncertainty. Thus the evaluation of the statistical uncertainty is needed when assuring the quality of the improved ground precisely. Moreover, the spatial correlation exists in core strength data. The statistical uncertainty emerging in the evaluation of the population statistical parameters is possibly affected by the spatial correlation. This paper presents the statistical analysis of core strength data observed in several deep cement mixing projects. The mean, standard deviation, and autocorrelation distance, were adopted as the statistical parameters of the strength. The type of the probability distribution of the core strength was investigated by the Kolmogoronv-Smirnov (K-S) test. The goodness fit of the normal and log-normal distributions was examined against the core strength data. The autocorrelation distance, which is the parameter representing the characteristic of the spatial correlation, was calculated from the distribution of the core strength using the maximum-likelihood method. The statistical uncertainty of the statistical parameters was evaluated using a Bayesian inference approach. In the Bayesian inference approach, a Markov chain Monte Carlo method was adopted to calculate the realizations of the population statistical parameters. The analysis results indicated the statistical uncertainty included in the statistical parameters is significantly affected by the spatial correlation.

Page 3 of 5 | Total Record : 49

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