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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 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
Hydrogeological properties around the KURT
Lee, Jin-Yong ; Kim, Kyung-Su ; Park, Kyung-Woo ; Han, Woon-Woo ;
The Journal of Engineering Geology, volume 20, issue 2, 2010, Pages 121~126
Current technology for radioactive waste disposal facility is operated as part of KURT site characterization in terms of reliability assessment is conducted to expand. In this study, a geological model of KURT surrounding area on the basis of flow characteristics of the site-scale hydrogeological study was about. Distributed in the study area into four boreholes were plotted using the stereo net NS, NW, EW, Low-angle fracture group was able to identify the components of geological models and include top soil layer, belt of weathering, Low-angle fracture zone, fracture zone was divided into. Separated by fracture of the hydraulic test of through the groundwater aquifer that provides the flow hydraulic conductivity and insulation hydraulic affecting the slope of the normal distribution for the size and direction by performing statistical analysis of fracture in the direction of local ns The advantage was confirmed. In addition, Low-angle fracture hydraulic conductivity of the value of 3.61e-07 m/s has a value greater than the major fracture, the fracture zones exist in the base rock and base rock and the hydraulic characteristics of the different methods applied and had to have a different interpretation judged by was.
Estimation of optimal pumping rate, well efficiency and radius of influence using step-drawdown tests
Choi, Hyun-Mi ; Lee, Jin-Yong ; Cheon, Jeong-Yong ; Jun, Seong-Chun ; Kwon, Hyung-Pyo ;
The Journal of Engineering Geology, volume 20, issue 2, 2010, Pages 127~136
Optimal pumping rate, well efficiency and radius of influence were estimated using field step-drawdown tests. According to the analysis results, optimal pumping rates were estimated as 9.37, 16.20
for KDPW 1 and 8.11, 14.10
for KDPW 2. The well efficiency was calculated as 72.02~90.73% for KDPW 1 while it was 70.62~88.52% for KDPW 2. In the meanwhile, the steady-state analysis yielded the radius of influence (ROI) of 3.50~31.92 m in case of pumping at KDPW 1 and the ROI of 0.14~37.43 m in case of pumping at KDPW 2. In addition, the transient analysis produced the ROI of 0.02~8.34 m for KDPW 1 pumping and the ROI of 0.24~9.68 m for KDPW 2 pumping. The methodology used in this study can be usefully applied in the pump and treat remediation design for contaminated groundwater.
Estimation of Continuous Infiltration Process by Unsaturated Permeability
Han, Heui-Soo ; Lee, Jung-Sik ; Jang, Jin-Uk ; Yang, Nam-Young ;
The Journal of Engineering Geology, volume 20, issue 2, 2010, Pages 137~146
To estimate the accumulated infiltration, Horton's and Green-Ampt's equations are usually applied. Because the real infiltration is penetrated into the soil continuously, to cover the problems of the conventional equations derived from the discontinuous infiltration system, new infiltration equation is derived from the concepts of continuous infiltration system. Furthermore, infiltration tests were done to compare the results from the conventional Horton's and Green-Ampt's equations and newly derived equation. Unsaturated permeability is the function of water content ratio or saturation degree, which affects directly to the infiltration capacity and accumulated infiltration. Therefore, the variation term of unsaturated permeability is inserted into the new equation to estimate the proper infiltration capacity and accumulated infiltration. It will make the more accurate analysis for the safety of structure and the behavior of groundwater.
Effect of Cut-off Wall near the Entrance of Spillway Tunnel
Kim, Gyoo-Bum ; Son, Young-Chul ; Seo, Kyung-Soo ;
The Journal of Engineering Geology, volume 20, issue 2, 2010, Pages 147~153
Cut-off wall with a low permeability can be constructed to prevent groundwater seepage in spillway tunnel areas. Three spillway tunnels are constructed in Im-ha multipurpose dam region and three types of cut-off walls with a variety of directions and scales are designed. As a result of MODFLOW modeling to assess the effect of cut-off wall for three types, groundwater inflows to the tunnels range from 64.26
and also they through a cut-off wall section from a reservoir do from 44.08
and it does not show any significant difference among them. Therefore, a construction process and an environmental conservation rather than the effectiveness of cut-off wall need to be considered to select the best cut-off wall in this region.
Probability Analysis of Rock Slope Stability using Zoning and Discontinuity Persistence as Parameters
Jang, Bo-An ; Sung, Suk-Kyung ; Jang, Hyun-Sic ;
The Journal of Engineering Geology, volume 20, issue 2, 2010, Pages 155~167
In analysis of slope stability, deterministic analysis which yields a factor of safety has been used until recently. However, probability of failure is considered as a more efficient method because it deals with the uncertainty and variability of rock mass. In both methods, a factor of safety or a probability of failure is calculated for a slope although characteristics of rock mass, such as characteristics of joints, weathering degree of rock and so on, are not uniform throughout the slope. In this paper, we divided a model slope into several zones depending on conditions of rock mass and joints, and probabilities of failure in each zone are calculated and compared with that calculated in whole slope. The persistence of joint was also used as a parameter in calculation of probability of failure. A rock slope located in Hongcheon, Gangwondo was selected and the probability of failure using zoning and persistence as parameter was calculated to confirm the applicability of model analysis.
Groundwater Flow Modeling and Suggestion for Pumping Rate Restriction around K-1 Oil Stockpiling Base with Geological Consideration
Moon, Sang-Ho ; Kim, Kue-Young ; Ha, Kyoo-Chul ; Kim, Young-Seog ; Won, Chong-Ho ; Lee, Jin-Yong ;
The Journal of Engineering Geology, volume 20, issue 2, 2010, Pages 169~181
This study aimed at simulating several responses to stresses caused by the ground water level variations around the K-1 oil stockpile. For this simulation, we considered the characteristic hydrogeological condition including the special occurrence of long and thick acidic dyke, which is regarded as the main geological structure dominating the ground water flow system at this study area. We activated twenty-four imaginary wells which are located in northern and southern area around central K-1 site. Each neighboring distance is altogether 300 m and whole distance between K-1 site and remote wells is 1,200 m. Through the modeling, we operated the long-term and continuous pumping tests and finally categorized five zones based on maximum pumping rates for the imaginary wells; zone I within 300 meter distance from K-1 site with a pumping rate of 50
; zone II between 300 to 600 meter distance from K-1 site with a pumping rate of 75
; zone III between 600 to 900 meter distance from K-1 site with 150
; zone IV between 900 to 1,200 meter distance from K-1 site with 300
; and zone V of acidic dyke area. At zone V, especially because of their possibility of high transmissivity for groundwater flow, it is necessary to control and restrict groundwater discharge.
Fractals and Fragmentation of Survivor Grains within Gouge Zones along Boundary Faults in the Tertiary Waeup Basin
Chang, Tae-Woo ;
The Journal of Engineering Geology, volume 20, issue 2, 2010, Pages 183~189
Fault gouge samples were collected from the fault cores of the boundary faults between the Cretaceous Basement and the Tertiary Waeup Basin. Fractal dimensions (D) were obtained by using survivor grains which were analysed from six thin sections of the gouges under the optical microscope. The elliptical survivor grains show a shape preferred orientation almost parallel to clay foliation in matrix, suggesting that it was formed by the rotation of the survivor grains in abundant fine-grained matrix during repeated fault slips. The size distributions of the survivor grains follow power-laws with fractal dimensions in the 2.40-3.02 range. D values of all samples but one are higher than a specific D value equal to 2.58 which predicts the self similarity of fragmentation process in constrained comminution model (Sammis et al., 1987), which indicates large fault slip and multiple faulting. Probably the higher D values than 2.58 mean the non-self-similar evolution of cataclastic rocks where fragmentation mechanism changed from constrained comminution to the grain abrasion accompanying selective fracture of larger grains.
Proposal of Equations related to Settlement and Lateral Movement According to Embankment on Marine Sedimentary Ground
Kim, Kyeong-Su ; Chung, Dae-Seouk ; Lee, Jong-Gil ;
The Journal of Engineering Geology, volume 20, issue 2, 2010, Pages 191~202
In this study, the relationship between the settlements and the horizontal displacements according to embankment was analyzed at the marine sedimentary grounds for preparation of a site, and then the empirical equations of both the settlement and the horizontal displacement considering the embankment load and the thickness were proposed. To do this, the field and laboratory tests were performed at the improvement section where the pre-loading method was applied, and the field monitoring was performed using various sensors. Based on the results of the tests and monitoring, the ground deposits, soil characteristics and engineering properties were analyzed and the settlements and lateral movements were estimated by the Regression analysis. The ground deposits from the ground surface were composed of reclaimed soils, sedimentary soils and based rocks. The thickness of clay in the sedimentary soils layer was ranged from 3.9 m to 44.5 m. The embankment heights to improve the ground during pre-loading were constructed from 4.7 m to 7.8 m in each section. The settlements during embankment were ranged from 0.959 m to 2.217 m and the lateral movements were ranged from 0.048 m to 0.313 m. As the result of regression analysis, the equations of settlements and horizontal displacements according to embankments may be proposed as
, respectively. The proposed empirical equations of the settlements and the horizontal displacements according to embankment on the marine sedimentary ground may be applied to the site where has a similar condition of study area.
Estimation of Hydraulic Parameters from Slug, Single Well Pumping and Step-drawdown Tests
Jo, Yun-Ju ; Lee, Jin-Yong ; Jun, Seong-Chun ; Cheon, Jeong-Yong ; Kwon, Hyung-Pyo ;
The Journal of Engineering Geology, volume 20, issue 2, 2010, Pages 203~212
The aim in this study is used to develop the remediation technologies for contaminated ground water. Slug, single well pumping and step-drawdown tests have been used to obtain hydraulic parameter estimates in the field. Slug tests yield hydraulic conductivity values using the Bouwer and Rice and C-B-P analysis methods. The mean and median hydraulic conductivity values of Bouwer and Rice method are
, respectively. On the other hand, C-B-P method gave mean and median hydraulic conductivity values of
, respectively. These analyses show a trend for the Bouwer and Rice method to yield lower hydraulic conductivity values in low permeability zones of granite in the study area. Sing well pumping test data were calculated through type curve in GW7, GW12 and MW9 wells. It could be interpreted that the differences of hydraulic conductivity and transmissivity values between GW7 and GW12, MW9 is related with fault clays and fractures in the bedrock among the wells. Step-drawdown tests were carried out in the KDPW1 and KDPW2 wells. The hydraulic parameter of KDPW1 and KDPW2 showed very litter difference between the values. The study of hydraulic parameter estimates can be used to purify in contaminated groundwater.
The Development of Straddle Packer Hydraulic Testing Equipment to Characterize Permeability in Deep Boreholes
Kim, Kyung-Su ; Park, Kyung-Woo ; Ji, Sung-Hoon ;
The Journal of Engineering Geology, volume 20, issue 2, 2010, Pages 213~220
The permeability characterization on the natural barrier for deep geological disposal of radioactive waste is very critical to evaluate total safety and performance assessment of disposal site. However, the confidence level in using previous hydraulic testing equipments consist of simple components to estimate rock mass permeability is not high enough to reflect in situ condition. The purpose of this research is to establish an advanced hydraulic testing equipment, which is applicable to deep borehole (up to 1,000 m), through the improvement of technical problems of previous packer systems. Especially, the straddle packer hydraulic testing equipment was designed to adopt both the hydraulic downhole shut-in valve(H-DHSIV) to minimize the wellbore storage effect and the real time data acquisition system to measure the pressure changes of test interval including its upper and lower parts. The results from this research lead to not only improve current technical level in the field of hydraulic testing but also provide important information to radioactive waste disposal technology development and site characterization project.