Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Journal of Engineering Geology
Journal Basic Information
Journal DOI :
The Korea Society of Engineering Gelolgy
Editor in Chief :
Volume & Issues
Volume 24, Issue 4 - Dec 2014
Volume 24, Issue 3 - Sep 2014
Volume 24, Issue 2 - Jun 2014
Volume 24, Issue 1 - Mar 2014
Selecting the target year
Paleostress of the Joseon and Pyeongan Supergroups in South Korea using the New Calcite Strain Gauge (NCSG)
Jang, Bo-An ; Ko, Chin-Surk ; Kim, Jung-Han ; Kim, Cheong-Bin ; Kang, Seong-Seung ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 311~322
DOI : 10.9720/kseg.2014.3.311
Limestone bodies under the tectonic environment have experienced various tectonic processes, and also changed the stress state. In this study, calcite twins found in limestones of the Joseon Supergroup and Pyeongan Supergroup in the northeastern part of the Ogcheon Belt, South Korea were measured, then the paleostress (i.e., the maximum shortening axis) was reconstructed using the new calcite strain gauge (NCSG) technique. The average twin thickness and average twin intensity increase as the total twin strain increases. We utilize the appearance of twins, the average twin thickness and average twin intensity, and the total twin strain to estimate that the observed calcite twins were produced at temperatures of <
in the Joseon Supergroup and
in the Pyeongan Supergroup. In the Joseon Supergroup, the dominant direction of the maximum shortening axis WNW-ESE to NW-SE; NE-SW shortening is also observed. The maximum shortening axes in the Pyeongan Supergroup are oriented NW-SE and NE-SW. The NE-SW direction of maximum shortening is associated with the occurrence of the Songrim orogeny of the Paleozoic to Early Jurassic, and the NW-SE direction of maximum shortening correlates to the Daebo orogeny of the Early Jurassic to Late Jurassic. It is thus concluded that the paleostress across the study area changed from NE-SW to NW-SE during the Mesozoic.
3D Finite Element Analysis of Fault Displacements in the Nobi Fault Zone, Japan
Choi, Young-Mook ; Kim, Woo-Seok ; Lee, Chul-Goo ; Kim, Chang-Yong ; Seo, Yong-Seok ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 323~332
DOI : 10.9720/kseg.2014.3.323
The Nobi fault zone, which generated the 1891 Nobi Earthquake (M8.0), includes five or six faults distributed in and around Gifu and Aichi prefectures, Japan. Because large cities are located near the fault zone (e.g., Gifu and Nagoya), and because the zone will likely be reactivated in the future, relatively thorough surveys have been conducted on the 1891 Nobi earthquake event, examining the fault geometry, house collapse rate, and the magnitude and distribution of earthquake intensity and fault displacement. In this study, we calculated the earthquake slip along faults in the Nobi fault zone by applying a 3D numerical analysis. The analysis shows that a zone with slip displacements of up to 100 mm included all areas with house collapse rates of 100%. In addition, the maximum vertical displacement was approximately
, which is in agreement with the
or greater vertical displacements obtained in previous studies. The analysis yielded a fault zone with slip displacements of > 30 mm that is coincident with areas in which house collapse rates were 60% of more. The analysis shows that the regional slip sense was coincident with areas of uplift and subsidence caused by the Nobi earthquake.
A Study on the Variation of Ground Safety Factor by Earthworks
Kim, Jinhwan ; Kwon, O-Il ; Baek, Yong ; Kim, Chang-Yong ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 333~341
DOI : 10.9720/kseg.2014.3.333
The construction of roads, tunnels, and bridges results in changes to the local terrain that may influence the ground safety factor, which represents the stability of geotechnical structures. In this study, we assessed construction sites that had collapsed as a result of terrain change, and then simulated variation in the ground safety factor with respect to terrain change caused by road construction. We assumed steep slopes to simulate changes in terrain in a mountainous area and assumed that earthworks took place for road construction by cutting a platform into the slope and altering the slope angle of the terrain both above and below the road. We calculated values of the ground safety factor through a stability analysis of the slope both above and below the road, and examined the variation in the safety factor of the above- and below-road slopes with respect to changes in road width. We found that if the slope angle was the same above and below the road, then the change in the ground safety factor during/after road construction occurred in the slope below the road, and if the slope angle above the road differed from that below, then the change occurred in both the above- and below-road slopes. Furthermore, the ground safety factor was essentially constant for road widths exceeding 2-6 m, depending on both above- and below-road slope angle. The findings of this study can be used to guide the management of construction sites and to assess changes in ground stability during road construction work, particularly in the early stages of earthworks, when the road width is narrow.
Development of Mobile System Based on Android for Tunnel Face Mapping
Park, Sung Wook ; Kim, Hong Gyun ; Bae, Sang Woo ; Kim, Chang Yong ; Yoo, Wan Kyu ; Lee, Jin Duk ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 343~351
DOI : 10.9720/kseg.2014.3.343
Tunnel face mapping plays an important role in risk analysis and infrastructure support decisions during tunnel construction. In this study, a digital mapping system using a mobile device is employed instead of existing face-mapping methods that rely upon face mapping sheets. The mobile device is then connected to the main server in the field, where a tunnel-specific database is compiled automatically. This information provides real-time feedback on the tunnel face to construction personnel and engineers, thus allowing for rapid assessment of tunnel face stability and infrastructure needs. The Douglas-Peucker algorithm, among others, is employed to resolve problems arising from the detailed mapping and speed problem by data accumulation. This system is expected to raise program optimization through field verification and additional functional improvements.
Evaluation of Pore Size Distribution of Berea Sandstone using X-ray Computed Tomography
Kim, Kwang Yeom ; Kim, Kyeongmin ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 353~362
DOI : 10.9720/kseg.2014.3.353
Pore structures in porous rock play an important role in hydraulic & mechanical behaviour of rock. Porosity, size distribution and orientation of pores represent the characteristics of pore structures of porous rock. While effective porosity can be measured easily by conventional experiment, pore size distribution is hard to be quantified due to the lack of corresponding experiment. We assessed pore size distribution of Berea sandstone using X-ray CT image based analysis combined with associated images processing, i.e., image filtering, binarization and skeletonization subsequently followed by the assessment of local thickness and star chord length. The aim of this study is to propose a new and effective way to evaluate pore structures of porous rock using X-ray CT based analysis for pore size distribution.
Influence of Anisotropy of Microcrack Distribution in Pocheon Granite Rock on Elastic Resonance Characteristics
Kang, Tae-Ho ; Kim, Kwang Yeom ; Park, Deok-Won ; Shin, Hyu-Soung ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 363~372
DOI : 10.9720/kseg.2014.3.363
Granite rock is reported to have three orthogonal anistoropic planes i.e., rift, grain induced by microcrack characteristics and mineral arrangement. We investigated the influence of thus fabric anisotropy in granite on elastic wave properties using free-free resonance test to obtain unconstrained compression wave velocity, shear velocity, Poisson ratio and damping ratio. As a result, Rod wave velocity is more dependent on anisotropy of granite due to microcrack distribution than shear wave velocity. In addition, anisotropy of Poisson ratio and damping ratio is also observed with respect to three anisotropic planes.
Analysis of Magnitude and Behavior of Rockfall for Volcanic Rocks in Ulleung-Do
Moon, Gi-Bong ; You, Young-Min ; Yun, Hyun-Seok ; Suh, Young-Ho ; Seo, Yong-Seok ; Baek, Yong ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 373~381
DOI : 10.9720/kseg.2014.3.373
It is difficult to predict the magnitude of a rockfall with respect to the shape, volume, and weight of the rock mass, as a rockfall exhibits erratic behavior that depends on the slope geometry, such as the height and dip of the slope. In this study, a field survey was conducted on the slopes of Ulleung-Do, South Korea, where rockfalls frequently occur along coastal roads, to classify the mode of rockfalls and estimate their magnitude. This study also analyzed the effects of rockfall behavior on roads by applying a simulation technique. Agglomerate and trachytic rocks distributed across the study area produce rockfalls in a differential weathering rockfall mode and a toppling rockfall mode. In terms of rockfall weight, trachytic rockfalls were 2-3 times heavier than agglomerate rockfalls. An analysis of rockfall behavior from the simulation indicates that the impact energy on the road exceeded the absorbing energy of a standard rockfall protection fence; however, the rockfall was secured when a ring-net was applied.
Evaluation and Classification System of Slope using the Slope Code System (SCS)
Jang, Hyun-Sic ; Kim, Ji-Hye ; Jang, Bo-An ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 383~396
DOI : 10.9720/kseg.2014.3.383
The condition, characteristics, and stability of slopes, as well as the consequences of slope failure, need to be understood for the proper stabilization of slopes and preclusion of potential disasters arising from slope failure. Here, a slope code system (SCS) that succinctly and accurately reflects the various conditions of a slope is proposed. The SCS represents the condition, characteristics, and geotechnical stability of slopes, as well as the consequences of slope failure, and the method is quickly and easily applied to a given slope. The SCS comprises five elements: 1) the slope material; 2) the genetic origin (rock type) and geological structure of the slope; 3) the geotechnical stability of the slope; 4) the probability of failure and remedial works made upon the slope; and 5) the consequences of failure. A letter code is selected from each element, and the result of the evaluation and classification of the slope is given as a five-letter code. Because the condition, characteristics, and geotechnical stability of a slope, as well as the consequences of slope failure, are provided by the SCS, this system will provide an effective mechanism for the maintenance and management of slopes, and will also allow more informed decision-making for determining which slopes should be prioritized for remedial measures.
Correlation Analysis between Weight Ratio and Shear Strength of Fault Materials using Multiple Regression Analysis
Moon, Seong-Woo ; Yun, Hyun-Soek ; Kim, Woo-Seok ; Na, Jong-Hwa ; Kim, Chang-Yong ; Seo, Yong-Seok ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 397~409
DOI : 10.9720/kseg.2014.3.397
The appearance of faults during tunnel construction is often difficult to predict in terms of strike, dip, scale, and strength, even though this information is essential in determining the strength of the surrounding rock mass. However, the strength and rock mass classification of fault zones are generally determined empirically on the construction site. In this study, 109 specimens were collected from fault of nine area throughout Korea, and direct shear tests were conducted and the particle distribution was analyzed to better characterize the fault zones. Six multiple regression models were established, using 97 of the specimens, to analyze the correlation between the shear strengths and weight rations of these fault materials. A verification of the six models, using the remaining 12 specimens, shows that in all of the models the coefficient of determination yielded
, with two models yielding
. These results provide useful information for determining the shear strength of fault materials in future studies.
Analysis of Landslide locations using Spectral Reflectance of Clay Mineral and ASTER Satellite Image
Nam, Koung-Hoon ; Lee, Hong-Jin ; Jeong, Gyo-Cheol ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 411~421
DOI : 10.9720/kseg.2014.3.411
The purpose of this study is to analyze the key factors that contribute to landslide causes through swelling clay minerals and terrain analysis in landslide sites taken place of in Yongin city, Gyeonggi-do, 2011. The study was conducted based on field survey by XRD (X-ray Diffraction), XRF (X-ray fluorescence), spectroscopic analysis on soil samples obtained from landslide sites and ASTER satellite image. Illite shows absorption features;
at 0.9 and
, broad water absorption features near 1.4 and
, and additional Al-hydroxyl features at 2.2, 2.3 and
, respectively. These absorption features are consistent with the bands 5, 6, and 7 of ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) satellite image. Illite image was extracted using band math of
. From these results, we confirmed the applicability of ASTER satellite image using identification of swelling clay minerals to landslide study.
Development of a Pressure Core Sampler with Built-in Data Logging System
Kim, Sang Il ; Cho, Young Hee ; Ki, Jung Seck ; Kim, Dong Wook ; Lee, Kye Kwang ; Kim, Hae Jin ; Choi, Kook Jin ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 423~429
DOI : 10.9720/kseg.2014.3.423
Development of a reservoir pressure core sampler (PCS) with a built-in data logging system (DLS) for recording real-time temperature and pressure observations is critical in domestic hydrocarbon production to accurately measure and monitor reserves of shale gas, coalbed methane, and gas-hydrate. Another purpose of this new technology is to minimize the loss of gas from the core as the drill core is collected. This is accomplished by maintaining the pressure of the sample from the moment the drill core is obtained at depth, thus allowing an accurate analysis of shale gas, coalbed methane gas, and gashydrate within the core. Currently, the United States and European countries have monopolized the development and marketability of PCS technologies. We are thus developing a reservoir PCS by analyzing the operating principle and mechanisms of the existing PCS, and by conducting tests on the existing PCS. We further aim to develop a PCS with a maximum operating pressure of 100 bar, a maximum operating temperature of
, and a pressure loss rate of 10%.
Current States of the Global Water Market and Considerations for the Groundwater Industry in South Korea
Kim, Byung-Woo ; Koh, Yong-Kwon ; Choi, Doo-Houng ; Kim, Deog-Geun ; Kim, Gyoo-Bum ;
The Journal of Engineering Geology, volume 24, issue 3, 2014, Pages 431~440
DOI : 10.9720/kseg.2014.3.431
Since the establishment of the Groundwater Act in Korea in 1993, the national policy on groundwater has focused on the preservation and management of groundwater, which should be used only as a subsidiary water resource. However, population growth, increased water demand, climate change, and the need for uniform water distribution have brought changes to groundwater policy, and have led to the prioritization of development projects such as groundwater dams and river bank filtration. Population growth, changes to the water environment, and increased water risks have all played a role in triggering rapid growth within the water industry; the size of the investment in water resources will also continue to increase worldwide. Until now, private wells and bottled mineral water have led the groundwater industry in South Korea. However, a new area of the groundwater industry, which includes the health and medical sciences, employs groundwater properties derived from regional geology, and is growing. This requires the advancement of groundwater research and technical development connected with ICT (Information and Communication Technology) and medical science, and that the public development of groundwater and its various applications is expanded through locating groundwater in the core of the water industry cluster.