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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Engineering Geology
Journal Basic Information
Journal DOI :
The Korea Society of Engineering Gelolgy
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Volume & Issues
Volume 13, Issue 4 - Dec 2003
Volume 13, Issue 3 - Sep 2003
Volume 13, Issue 2 - Jun 2003
Volume 13, Issue 1 - Mar 2003
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Slope Stability Analysis and Suggestion of Stabilization Methods on Failed Cut-Slopes Interbedded with Weakness Layer
The Journal of Engineering Geology, volume 13, issue 2, 2003, Pages 157~170
This study is performed to investigate the cause of slope failure and to suggest suitable stabilization methods for the failed rock slopes. The slope which is located along the national highway between Maesan and Kakok in Dangjin-gun failed during the construction of roads. Site investigation, drilling program, field measurements, rainfall records, and stability analyses are used to investigate the cause of the slope failure. The problem determining the cut-slope angle based on the existing design manual for the construction of roads is reviewed based on the case history given in this paper. If weakness layer and geological structures such as folds and faults are developed in a slope, slope failure is possible even though the direction of slope and the direction of discontinuities depart more than
Thermohydromechanical Behavior Study on the Joints in the Vicinity of an Underground Disposal Cavern
Jhin wung Kim ; Dae-seok Bae ;
The Journal of Engineering Geology, volume 13, issue 2, 2003, Pages 171~191
The objective of this present study is to understand long term(500 years) thermohydromechanical interaction behavior on joints adjacent to a repository cavern, when high level radioactive wastes are disposed of within discontinuous granitic rock masses, and then, to contribute this understanding to the development of a disposal concept. The model includes a saturated discontinuous granitic rock mass, PWR spent nuclear fuels in a disposal canister surrounded with compacted bentonite inside a deposition hole, and mixed bentonite backfilled in the rest of the space within a repository cavern. It is assumed that two joint sets exist within a model. Joint set 1 includes joints of
dip angle, spaced 20m apart, and joint set 2 is in the perpendicular direction to joint set 1 and includes joints of
dip angle, spaced 20m apart. The two dimensional distinct element code, UDEC is used for the analysis. To understand the joint behavior adjacent to the repository cavern, Barton-Bandis joint model is used. Effect of the decay heat from PWR spent fuels on the repository model has been analyzed, and a steady state flow algorithm is used for the hydraulic analysis.
Engineering Geological Geotechnical Characteristics of Newly Constructed Road between the Yangsan Fault and the Dongrae Fault
The Journal of Engineering Geology, volume 13, issue 2, 2003, Pages 193~205
Fine grained granite, porphyritic granite and biotite granite together with intruded and extruded andesitic rocks are distributed in the study area which is bounded by the Yangsan and Dongrae faults. A new domestic road is being constructed along the area between the two major faults. The NNE trending Bupki fault and NE trending Myungkog fault are also developed within the area cross the road. The sheeting joints with dips of less than 30 degrees are only developed in the area of granite outcrop. High angle joints can be divided into 3 sets, such as, NE trending, NW trending and nearly EW trending joints. The joint space is mostly more than 20cm and the joint compressive strength is more than 100 MPa. These data show that even though the study area is situated between large faults, the ground condition is good because the damage zone of the Yangsan and Dongrae faults is relatively narrow.
Characteristics of Fracture Systems in Southern Korea
The Journal of Engineering Geology, volume 13, issue 2, 2003, Pages 207~225
According to the data analysis of the regional fracture systems in southern Korea, the fracture orientations show three dominant sets : NNE, NW and WNW. A NNE set is the most abundant and includes most of the largest fractures. The highest fracture density is shown in the Taebaegsan mineralized area corresponding to Ogchon nonmetamorphic belt and the lowest one in the southwestern area of southern Korea. In addition, the density is higher in nonmetamorphic sedimentary rocks such as Choseon Supergroup. Pyeongan Supergroup, Daedong Supergroup and Kyeongsang Supergroup than in Precambrian basements and Jurassic granites. The regional fractures in southern Korea can be classified into four orders designated
on the basis of their trace length. It is quite significant that fractures of each order are self-similar with respect to orientation and the combined fracture length distribution indicates a power-law distribution with an exponent of -2.04. As fractures were analyzed based on the tectonic provinces, Gyeonggj Massif and Kyeongsang Basin have all orders of fractures from
. Most of the large scale faults may be ascribed to the products of slip accumulation through multiple deformation. Others besides
fractures are thought to be evenly distributed through the whole area of southern Korea.
Creep behaviour of mudstone in the tertiary Duho Formation at Pohang basin
The Journal of Engineering Geology, volume 13, issue 2, 2003, Pages 227~238
Understanding of a creep behavior in rocks under a constant load, due to visco-elastic properties of rock, is an essential element to predict a long term ground deformation. In order to clarify the creep characteristics of the mudstone in Duho formation at Pohang basin, deposited during Tertiary, a series of laboratory tests including physical properties, unconfined compressive strength and uniaxial creep tests, was performed. The mudstone showed a higher creep potential due to 26% of clay minerals such as illite and chlorite. The unconfined compressive strength of the rock was
in average, and four creep tests were performed under constant stress of 40 to 70 % of the strength. The creep constants in the empirical and theoretical equations were deduced from the time-strain curves obtained from the tests. Among the several equations, the empirical equation proposed by Griggs and theoretical equation of Burger’s model are appreciated as the best one to express the creep behavior of the mudstone. Instantaneous elastic strain was linearly increased with stress level but strain velocity during the first creep is decreased with a similar pattern by time lapse regardless the stress level.
Hydrochemistry and Nitrogen and Sulfur Isotopes of Emergency-use Groundwater in Daeieon City
The Journal of Engineering Geology, volume 13, issue 2, 2003, Pages 239~256
The purpose of this study is to investigate the hydrochemical characteristics of emergency-use groundwater in the Daejeon area, and to elucidate the contamination source of
and the origin of sulfate in the groundwater. The groundwater shows weak acidic pH, the electrical conductivity ranging from 142 to
, and the hydrochemical types of
. The Box-Whisker analysis and the Krigging analysis of chemical data of groundwater were made to demonstrate the concentration distribution of hydrochemical composition, and to compare the trend of hydrochemical data. The groundwater in the area of Dong-gu, Jung-gu and Daeduk-gu, where are old town, shows higher electrical conductivity, nitrate content, sulfate and
levels than groundwater in new town area of Seo-gu and Yusung-gu.
of groundwater in the area of Seo-gu and Yusung-gu ranges from +7.4 to
, indicating that major contamination source of
is the leakage from municipal sewage pipe lines.
of groundwater in the old town area of Tong-gu, Jung-gu and Daeduk-gu shows the range between +10.2 and
, meaning that major contamination source is leakage of septic tank.
of groundwater shows the range of
. Sulfur isotope indicates the possibility of a sulfate reduction and the input of anthrophogenic source.
Mechanical Anisotropy of Jurassic Granites in Korea
The Journal of Engineering Geology, volume 13, issue 2, 2003, Pages 257~266
Jurassic granites of three sites, Pocheon, Geochang and Habcheon, were tested to investigate the effect of microcracks on Physical and mechanical properties of the granites. Fifteen oriented core specimens were used for the physical property test. The test result shows that porosity is almost proportioned to water content. P-wave velocity is the highest in the direction of axis ‘H’, intersection of two major microcrack sets and the lowest in the axis ‘R’, normal to the rift plane. Compressional strength tests were carried out for each core specimen taken parallel with axes ‘R’, ‘G’ and ‘H’, measuring strains. The results revealed a strong correlation between microcrack orientation and other mechanical properties such as rock strength.