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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 19, Issue 4 - Dec 2009
Volume 19, Issue 3 - Sep 2009
Volume 19, Issue 2 - Jun 2009
Volume 19, Issue 1 - Mar 2009
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Comparative Study of Square-Inventory Method with Scanline Survey in Slope Stability Analysis
Cheong, Sang-Won ; Choi, Byoung-Ryol ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 119~129
In relation to slope stability analysis, geologic characteristics and engineering properties of the discontinuities in three slopes selected are compared and analyzed by both square-inventory method and scanline survey. The aim of the study is in evaluating which method is applied better in slope stability analysis by comparing results of the two methods with those of direct observation on outcrop of slope failures generated. In each slope, results of comparative analysis among geologic and engineering properties are analyzed similarly one another. However, results of orientation analysis in slope 2 are different each other, which indicates orientation of joints in slope 2 depends on persistency and frequency of each joint and also indicates appearance of new joint set with different orientation. Probability density distribution and spacing in slope 3 are high in comparison to those in slope 2 and 3. The reasons are that distribution of psammitic rocks and development of minor folds in slope 3 unlike slope 2 and 3 are closely associated with development of joints. The research data indicate that the square-inventory method predicts more precise failure aspects and is more effective way than scanline survey in analyzing slope stability of the study area.
Artificial Injection to Control Saltwater Intrusion in Groundwater-Numerical Study on a Vertical Cross Section
Hong, Sung-Hoon ; Shi, Lei ; Cui, Lei ; Park, Nam-Sik ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 131~138
A simulation-optimization model is developed for development of groundwater and control of a saltwater wedge for protecting over-exploiting freshwater pumping wells. To achieve the goal an objective function is developed for three types of wells: freshwater pumping, freshwater injection and saltwater pumping. Integrity of groundwater environment is accounted for by including three indices. Illustrative cross-sectional examples show that both types of barriers can protect freshwater pumping wells from saltwater intrusion. A barrier well operating at the same rate located anywhere within a certain reach can protect a pumping well. However, the location of the reach appears to contradict the common practice of barrier placements. Consideration of the groundwater environment yields a unique optimal location for barrier wells.
Microseismic Monitoring for KAERI Underground Research Tunnel
Kim, Kyung-Su ; Bae, Dae-Seok ; Koh, Yong-Kwon ; Kim, Jung-Yul ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 139~144
The microseismic monitoring system with wide range of frequency has been operating in real time and it is remotely monitored at indoor and on-site for one year. This system was constructed and established in order to secure the safe and effective operation of the KAERI Underground Research Tunnel(KURT). For one year monitoring work, total 14 events were recorded in the vicinity of the KURT, and the majority of events are regarded as ultramicroseismic earthquake and artificial impacts around the tunnel. The major event is the magnitude 3.4 earthquake which was centered around Gongju city, Chungnam Province. It means that there is no significant evidence of high frequency microseismic event, which is associated with fracture initiation and/or propagation in the rock mass and shotcrete. Three components sensor was applied in order to analyze and define the direction of vibration as well as an epicenter of microseismic origin, and also properly designed and installed in a small borehole. This monitoring system is able to predict the location and timing of fracturing of rock mass and rock fall around an undreground openings as well as analysis on safety of various kinds of engineering structures such as nuclear facilities and other structures.
Joint Characteristics in Layered Rocks
Chang, Tae-Woo ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 145~152
Joints are planar tensile opening-mode fractures whose relative motion, as the fracture propagates, is perpendicular to bedding plane and occur in a systematic manner to form a joint set. This paper discusses the mechanical control of joint propagation, the relationship between join spacing and layer thickness, the join saturation, the frequency distribution of join spacing, the joint density, the cross joint, and the development mechanism of joint from a lot of recent joint studies in sedimentary rocks.
Estimation to the Strength of Basalt in Jeju Island according to Rock Failure Criterions
Nam, Jung-Man ; Yun, Jung-Mann ; Song, Young-Suk ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 153~163
In this study, a series of triaxial tests on Jeju basalt were carried out and then rock strength parameters were estimated by the Mohr-Coulomb failure criterion and the Hoek-Brown failure criterion using the test results. The characteristics of both failure criterions were investigated through comparing the estimated rock strength parameters. As the result of the Mohr-Coulomb criterion, the cohesions and the internal friction angles are determined as 5.35 MPa and
of Pyoseonri basalt, 16.99 MPa and
of Trachy-basalt, and 2.33 MPa and
of Scoria, respectively. The cohesions and internal friction angles were estimated by the Hoek-Brown failure criterion in the basis of the results of regression analysis. The cohesions and the internal friction angles are determined as 4.77 MPa and
of Pyoseonri basalt, 14.69 MPa and
of Trachy-basalt, and 2.22 MPa and
of Scoria, respectively. As the result of comparison between the Mohr-Coulomb failure criterion and the failure envelope predicted by the Hoek-Brown criterion, the cohesion estimated by the Hoek-Brown criterion is usually lower than that obtained from the Mohr-Coulomb criterion, whereas the friction angle estimated by the Hoek-Brown criterion is higher than that obtained from the Mohr-Coulomb criterion.
Creep Behaviour of Red Shale in the Haman Formation by Multi Stage Loading Test
Cho, Lae-Hun ; Kim, Gyo-Won ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 165~175
This study is concerned with creep characteristics of red shale in the Haman Formation by the single stage and multi stage loading tests. Creep constants in the Griggs's experiential equation,
, are determined by regression analysis on the total data obtained. The transition time between the primary and second creep means the time when the differential value of
t is equal to the differential value of
. The correlation equation between loads (
%) and creep constants is deduced from the three times multi stage loading tests. Also a failure time under each loads is anticipated from creep constants and maximum strain at the failure.
Development of the Linear Regression Analysis Model to Estimate the Shear Strength of Soils
Lee, Moon-Se ; Ryu, Je-Cheon ; Kim, Kyeong-Su ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 177~189
The shear strength has been managed as an important factor in soil mechanics. The shear strength estimation model was developed to evaluate the shear strength using only a few soil properties by the linear regression analysis model which is one of the statistical methods. The shear strength is divided into two part; one is the internal friction angle (
) and the other is the cohesion (c). Therefore, some valid soil factors among the results of soil tests are selected through the correlation analysis using SPSS and then the model are formulated by the linear regression analysis based on the relationship between factors. Also, the developed model is compared with the result of direct shear test to prove the rationality of model. As the results of analysis about relationship between soil properties and shear strength, the internal friction angle is highly influenced by the void ratio and the dry unit weight and the cohesion is mainly influenced by the void ratio, the dry unit weight and the plastic index. Meanwhile, the shear strength estimated by the developed model is similar with that of the direct shear test. Therefore, the developed model may be used to estimate the shear strength of soils in the same condition of study area.
The Behavior of Stabilizing Piles installed in a Large-Scale Cut Slope
Song, Young-Suk ; Hong, Won-Pyo ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 191~203
The effect of stabilizing piles on cut slopes is checked and the behavior of slope soil and piles are observed throughout the year by field measurements on the large-scale cut slopes. First of all, the behavior of the slope soil was measured by inclinometers during slope modification. Landslides occurred in this area due to the soil cutting for slope modification. The horizontal deformations of slope soil are gradually increased and rapidly decreased at depth of sliding surface. As the result of measuring deformation, the depth of sliding surface below the ground surface can be known. Based on the measuring the depth of the sliding surface, some earth retention system including stabilizing piles were designed and constructed in this slope. To check the stability of the reinforced slope using stabilizing piles, an instrumentation system was installed. As the result of instrumentation, the maximum deflection of piles is measured at the pile head. It is noted that the piles deform like deflection on a cantilever beam. The maximum bending stress of piles is measured at the soil layer. The pile above the soil layer is subjected to lateral earth pressure due to driving force of the slope, while pile below soil layer is subjected to subgrade reaction against pile deflection. The deflection of piles is increased during cutting slope in front of piles for the construction of soil nailing. As a result of research, the effect and applicability of stabilizing piles in large-scale cut slopes could be confirmed sufficiently.
A Particle Tracking Method for the Lagrangian-Eulerian Finite Element Method in 3-D Subsurface System
Lee, Jae-Young ; Kang, Mee-A ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 205~215
The conventional numerical models to analyze flow in subsurface porous media under the transient state usually generate numerical oscillation and unstability due to local flux domain for critical cases such as infiltration into initially dry soil during rainfall period. In this case, it is required refined mesh and small time step, but it decrease efficiency of computation. In this study, numerical unstability in discontinuity domain is removed by applying particle tracking algorithm to simulate unsteady subsurface flow with inflow boundary condition. Finally the hybrid LE FEM improving numerical stability is proposed. The hypothetical domains with unsteady uniform and nonuniform flow field were used to demonstrated algorithm verification. In comparison with analytic solution, we obtained reasonable results and conducted simulation of hypothetical 3-D recharge/pumping area. The proposed algorithm can simulate saturated/unsaturated porous media with more practical problems and will greatly contribute to accuracy and stability of numerical computation.
A Comparative Study of Density Compensation in Gamma-Gamma Log in PVC Casings between above and below Ground Water Tables
Kim, Yeong-Hwa ; Hwang, Byong-Chol ; Park, Sung-Geun ; Kim, Jong-Man ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 217~225
A series of model borehole experiments and analyses for density compensation were performed to achieve the effective density correction of gamma-gamma log obtained from PVC cased boreholes. A follow-up survey was made for clarifying the variation property of detector responses depending on casing types, the presence of borehole fluid, and the degree of separation between probe and borehole wall. A special emphasis was placed on the comparison of gamma responses obtained from above and below ground water tables. Finally, we could quantify the detector responses as a function of separation between the probe and borehole wall, construct standoff compensation charts, and the limitations of the compensation have been discussed for the environments of both above and below ground water tables.
An Analysis of Groundwater Level Fluctuation Caused by Construction of Groundwater Dam
Kim, Jong-Tae ; Kim, Man-Il ; Chung, Il-Moon ; Kim, Nam-Won ; Jeong, Gyo-Cheol ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 227~233
Most of hydrological processes of groundwater recharge generally are occupied a rainfall, and recharged an aquifer along infiltrate into subsurface. These processes mainly have an influence by hydrological characteristics and topographic gradient of the aquifer. Development of water resources and its management is not good because of temporal and spatial disproportion in local rainfall. In order to deal with insufficiency of water resources from now on, development of groundwater dam requires a plan of a sustainable of new water resources. These are necessary that investigation of construction area of groundwater dam, effective groundwater development interconnected with surface water and groundwater, and assessment of an application of groundwater dam for utilization of water resources. Tn this study we were derived the input data by geological survey, hydraulic and hydrological analysis around Hoengchun-river, located in Hadong-gun, Gyeongsangnam Province where is a plan area for construction of groundwater dam. Based on input data we were carried out the interconnected analysis of surface water and groundwater using the SWAT-MODFLOW, and predicted groundwater fluctuation of its construction before and after.
Origin of B, Br and Sr in Groundwater from Bukahn-myeon, Yeongcheon, Gyeongbuk Province, with Emphasis on Hydrochemistry
Choo, Chang-Oh ; Lee, Jin-Kook ; Lee, Chang-Joo ; Park, Ki-Ho ; Jeong, Gyo-Cheol ;
The Journal of Engineering Geology, volume 19, issue 2, 2009, Pages 235~250
Environmental elements such as B, Br, and Sr in groundwater from Bukahn-myeon, Yeongcheon, Gyeongbuk Province, were investigated in order to know their origin with emphasis on hydrochemistry. pH ranges from 7.37 to 8.39. B content is 0.41
4.62 mg/L with an average 1.74 mg/L and Br content is 0
3.24 mg/L with an average 2.22 mg/L, and Sr content is 0.93
8.64 mg/L with an average 2.76 mg/L. The water types plotted by the Piper diagram are different but mostly
. Some constituents contributing to EC are Na,
, Cl with high determinative coefficients(
) of 0.85, 0.70, 0.90, respectively. The coefficients(
) of Cl to Na, K,
are 0.54, 0.68, 0.53, respectively. It should be noted that there are high cocfficients(
) of B-Sr and
with 0.65, 0.64, respectively. The Cl/Br ratios are 5.21
30.70 due to significant depletion of Cl. The
ratios are 1.32
27.24 with an average of 5.92, ascribed to abundant introduction of
or significant depletion of Cl. Chemical speciation calculated shows that B exists mostly as
and Br exists as only
. Sr exists mostly as
. Saturation index represents that goundwater is supersaturated with respect to barite, kaolinite, illite, K-mica, and smectite while it is slightly undersaturated with respect to silica, gypsum, anhydrite, talc, chrysotile, feldspar, kaolinite, illite, K-mica, and smectite. The saturation index of celestine is -2.23
-0.13 indicating more Sr can be incorporated into groundwater. Groundwater is still much undersaturated to halite. It is likely that the origin of S and Sr was related to the Yucheon volcanic rocks. Br might be originated from the local geological features with introduction of anthropogenic matters.