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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
Editor in Chief :
Volume & Issues
Volume 20, Issue 4 - Dec 2010
Volume 20, Issue 3 - Sep 2010
Volume 20, Issue 2 - Jun 2010
Volume 20, Issue 1 - Mar 2010
Selecting the target year
Reactive transport modeling of the
-cement reaction in a
injection well for
Jo, Min-Ki ; Chae, Gi-Tak ; Choi, Byoung-Young ; Yu, Soon-Young ; Kim, Tae-Hee ; Kim, Jeong-Chan ;
The Journal of Engineering Geology, volume 20, issue 4, 2010, Pages 359~370
leakage from a geological formation utilized for
storage could result in failure of the facility and threaten the environment, as well as human safety and health. A reactive transport model of a
-cement reaction was constructed to understand chemical changes in the case of
leakage through a cement crack in an injection well, which is the most probable leakage pathway during geological storage. The model results showed the dissolution of portlandite and CSH (calcium silicate hydrate) within the cement paste, and the precipitation of secondary CSH and calcite as the
plume migrated along the crack. Calcite occupied most of the crack after 3 year of reaction, which could be maintained until 30 years after crack development. The present results could be applied in the development of technology to prevent
leakage and to enhance the integrity of wells constructed for
Prediction of a Fault Zone ahead of a Tunnel Face based on the Orientation of Displacement Vectors
Kim, Kwang-Yeom ; Yim, Sung-Bin ; Kim, Jang-Kyeom ; Seo, Yong-Seok ; Kim, Jin-Woung ;
The Journal of Engineering Geology, volume 20, issue 4, 2010, Pages 371~380
A three-dimensional finite element analysis was performed to predict the location of a fault zone ahead of a tunnel face based on convergence displacement. Geometrical models for the numerical analysis were developed based on the possible geometric intersection between the fault zone and the tunnel. Fifteen fault models were generated from combinations of faults with five different strikes (at
intervals) and three dips (vertical,
) relative to the tunnel route. The displacements on the crown and side walls were calculated and analyzed using a vector orientation approach. As a result, nine representative prediction charts were developed, showing location and orientation of the fault zone based on convergence displacement.
Hydrogeological characteristics of a seepage area of white leachate
Kim, Man-Il ; Park, Young-Gyu ; Kim, Eul-Young ; Kim, Yang-Bin ; Yong, Hwan-Ho ; Ji, Won-Hyun ;
The Journal of Engineering Geology, volume 20, issue 4, 2010, Pages 381~390
This study assessed the hydrogeological characteristics of a seepage area of white leachate. The geological characteristics of the leachate were determined by a surface survey, and an electrical resistivity survey and borehole image processing system (BIPS) were applied to estimate the distribution of discontinuities, to assess the geological structure of the seepage areas. Fluctuations in groundwater level within boreholes were measured during periods of precipitation in the dry and wet seasons. The results show that electrical resistivity is lower in the seepage section than in non-seepage sections. The distribution of fracture zones and limestone cavities was inferred from the logging data and BIPS data. Variations in groundwater level and groundwater recharge, related to rainfall events, show the direct effect of rainfall events during the rainy season. We obtained a strong relationship between seepage amount and rainfall (correlation coefficients of 0.83-0.97).
Distribution of the Wetness Index and Field Characteristics of Talus Slopes in the Jungsun Area, Gangwon Province
Kim, Seung-Hyun ; Koo, Ho-Bon ; Rhee, Jong-Hyun ; Kim, Sung-Wook ; Choi, Eun-Kyeong ;
The Journal of Engineering Geology, volume 20, issue 4, 2010, Pages 391~399
We performed a hydraulic analysis based on the wetness index of talus slopes in Jungsun, Gangwon province. We estimated the relation between the degree of development of the temporary water system, and talus topography and distribution. We also assessed the distribution of talus based on a map of the wetness index. We divided areas of tallus into stable and unstable types, and estimated the size, distribution and shape-preferred orientation of clasts. We performed numerical simulations of rockfall events to assess the optimum location of rockfall barriers upon talus slopes.
Loading Characteristics of Non-Point Source Pollutants by Rainfall - Case Study with Cherry Tree Plot -
Kang, Mee-A ; Choi, Byoung-Woo ; Yu, Jae-Jeong ;
The Journal of Engineering Geology, volume 20, issue 4, 2010, Pages 401~407
This study was carried out to produce the characteristics of pollutant loads caused by a cherry tree plot as a nonpoint sources(NPS) unit in agricultural areas. The relationship between rainfall and runoff didn't show a good coefficient with 0.5. Despite precipitation amount was less than 20 mm, runoff occurred with
because of high rainfall intensity of 8.8 mm/hr. In contrast, runoff was not occurred when precipitation amount was 47.4 mm in one case. In that case the primal effect on runoff was not precipitation amount. Correlation between load of pollutants such as BOD, COD, TN and TP and runoff' volumes showed significantly positive values which were more than r = 0.92 for all pollutants except SS(r = 0.71). SS could be a proper factor for estimating pollutant loads of BOD, COD, TN and TP because of a high correlation more than r = 0.73 between SS load and pollutant loads of BOD, COD, TN and TP. Both Organics and nutrient pollutants could be reduced if we control SS in runoff. The highest concentration of TN was detected in the event which was affected by fertilization activities directly. Therefore fertilization must be considered as a function of impact parameters on TN load in agricultural areas.
Infiltration Characteristics of a Weathered Cut-Slope during Repetition Rainfall
Lee, Jeong-Yeob ; Kim, Seung-Hyun ; Choi, Ji-Yong ; Koo, Ho-Bon ;
The Journal of Engineering Geology, volume 20, issue 4, 2010, Pages 409~414
In recent years, intensive rainfall has occurred with increasing frequency due to climate change, and has had an effect on slope failure. Such rainfall is intense and occurs repeatedly. During the rainfall, most of the water flows along the slope face, but some seeps into the soil, inducing surface failure of the slope. In this study, the infiltration characteristics of intensive rainfall are analyzed under various conditions to evaluate its effect on slope stability, using the Finite Element Method. As a results of this study, the shorter rainfall period and the more rainfall repetition number, the bigger effect of rainfall infiltration is and although the duration of rainfall is short, infiltration effect of rainfall is necessary to be considered on slope stability.
Evaluation of the Compaction Characteristics of CFRD Construction Materials
Han, Sang-Hyun ; Yea, Geu-Guwen ; Park, Jong-Hwa ;
The Journal of Engineering Geology, volume 20, issue 4, 2010, Pages 415~424
A prototype of a Concrete-Faced Rock-fill Dam (CFRD) was constructed to evaluate the behavior of the materials in each zone within the dam. The tested materials, selected based on their grain size distribution, were used in constructing the prototype dam with layers of variable thickness, settlement ratio, and water content. We investigated the suitability of various values of hydraulic conductivity, water content, dry unit weight, and settlement ratio for zones within the dam. The test results revealed the relationships between the number of passes and the dry unit weight, between the dry unit weight and the settlement ratio, and between the settlement ratio and the number of passes. This paper focuses on the relationship between hydraulic conductivity and the number of passes. The results of the present analysis could be used to establish reasonable compaction standards for materials used in dam construction.
Relationship between fracture distribution and the acidity of mine drainage at the Il-Gwang Mine
Choi, Jae-Young ; Um, Jeong-Gi ; Kwon, Hyun-Ho ; Shim, Yon-Sik ;
The Journal of Engineering Geology, volume 20, issue 4, 2010, Pages 425~436
We established a stochastic 3-D fracture network system for fractured rock masses located in Il-Gwang Mine, Busan, to explore the relationship between the acidity of mine drainage and fracture geometry. A field scanline survey and borehole image processing were performed to estimate the best probability distributions of fracture geometry parameters. The stochastic 3-D fracture network system constructed for the rock masses was validated and deemed to be successful. The 3-D fracture network model was suitable for developing conceptual ideas on fluid flow in fractures at a field experimental site. An injection well and three observation wells were drilled at the field experimental site to monitor the acidity of mine drainage induced by the injection of fresh water. The field experiment, which was run for 29 days, yielded a significant relationship (with a high coefficient of determination) between the fracture geometry parameters and the acidity of mine drainage. The results show that pH increased with increasing relative frequency of fracture strike, and decreased with increasing fracture density. The concentration of
decreased with increasing relative frequency of fracture strike, and increased with increasing fracture density.
Probabilistic Stability and Sensitivity Analysis for a Failed Rock Slope using a Monte Carlo Simulation
Park, Sung-Wook ; Park, Hyuck-Jin ;
The Journal of Engineering Geology, volume 20, issue 4, 2010, Pages 437~447
A probabilistic analysis of slope stability is an appropriate solution in dealing with uncertainty in problems related to engineering geology. In this study, a Monte Carlo simulation was performed to evaluate the performance function that is Barton's equation. A large number of randomly generated values were obtained for random variables, and the performance function was calculated repeatedly using randomly generated values. A previous study provided information of slope geometry and the random characteristics of random variables such as JRC and JCS. The present approach was adopted to analyze two failed slopes. The probabilities of failure were evaluated for each slope, and sensitivity analysis was performed to assess the influence of each random variable on the probability of failure. The analysis results were then compared with the results of a deterministic analysis, indicating that the probabilistic analysis yielded reliable results.
Numerical simulation of the change in groundwater level due to construction of the Giheung Tunnel
Lee, Jeong-Hwan ; Hamm, Se-Yeong ; Cheong, Jae-Yeol ; Jeong, Jae-Hyeong ; Kim, Ki-Seok ; Kim, Nam-Hoon ; Kim, Gyoo-Bum ;
The Journal of Engineering Geology, volume 20, issue 4, 2010, Pages 449~459
We performed numerical simulations of the excavation of an underground structure (the Giheung Tunnel) in order to evaluate the rate of groundwater flow into the structure and to estimate the groundwater level around the structure. The tunnel was constructed in Precambrian bedrock in Gyeonggi Province, South Korea. Geological and electrical resistivity data, as well as hydraulic test data, were used for the numerical modeling. The modeling took into account the strike-slip faults that cross the southern part of Giheung Tunnel, as these structures influence the discharge of groundwater into the tunnel. The transient modeling estimated a groundwater flow rate into the tunnel of
/day, with a grout efficiency of 40%, yielding good agreement between the calculated change in groundwater level (6.20 m) and that observed (6.30 m) due to tunnel excavation.
Analysis of Porosity and Distribution of Pores in Rocks by Micro Focus X-Ray CT
Jeong, Gyo-Cheol ; Takahashi, Manabu ;
The Journal of Engineering Geology, volume 20, issue 4, 2010, Pages 461~465
Weathering and permeability in rocks play a very important role in underground disposal of radioactive waste and their long-term management as well as stability security of rock structures. Weathering and permeability of rocks are largely controlled by the characters of inner structures of rocks. In other words, weathering rate can be accelerated depending on the quantity of pore and microcrack in rocks. Quantitative evaluation of inner structures of rocks can serve as a tool that can assess the degree of weathering of rocks. Therefore it can be said that the understanding of three dimensional distribution of the inner structure of rocks is important for long-term management of rock structures. This study was performed to analyze three dimensional distribution of pore in rocks using Micro Focus X-ray CT on fresh granite and weathered granite from Korea. Results of the analysis clearly show distribution of pore and porosity of the inner rock.