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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 14, Issue 4 - Dec 2004
Volume 14, Issue 3 - Sep 2004
Volume 14, Issue 2 - Jun 2004
Volume 14, Issue 1 - Mar 2004
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Study on the Characteristics of Shear Strength on the Weathered Granite Soil Slope in Accordance with the Rainfall
Shim Tae-Sup ; Kim Sun-Hak ; Ki Wan-Seo ; Joo Seung-Wan ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 349~360
This study calculated the pore water pressure, the depth of seepage, the constant of the strength in accordance with the slope inclination and the rainfall intensity over the slope built by the weathered granite soil (SP, SM). And, the change of the shear strength in accordance with the rainfall has been compared and analyzed by applying the shear strength formula of the unsaturated soil. As a result, the rainfall intensity is stronger and the slope inclination is gentler the seepage speed in accordance with the rainfall became faster proportionally. As a result of comparing and analyzing both the theoretical value of Lumb and the actual value of the model, it can be said that the actual value is faster. Since SM shows the bigger shear strength than SP, it can also be said that as the granules increase, the coefficient of permeability becomes smaller; and as the seepage rate became smaller, it affects the seepage speed. Likewise, the shear strength within the slope displays the smallest shear strength at the inclination of 1:1.5 the reason of its decrease turned out that it was due to the increase of the pore water pressure.
A Development of Dielectric Measurement System for Detecting Physical Parameters of Ground in Subsurface Dam
Kim Man-il ; Jeong Gyo-Cheol ; Park Chang-Kun ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 361~369
The authors designed a new technique to measure dielectric constant of a soil media by Frequency Domain Reflectometry (FDR) system and its measurement sensor probe with different length such as 7m, 10cm and 15cm for estimating the variations of dielectric constant. Measurement of dielectric constant of soil material is possible to measure an interference wave generated by between incidence wave and reflection wave which are detected to electro-magnetic wave through the directional coupler at the high frequency range,0.1 to 1.7GHz, by FDR system. The obtained experimental results verified that the technique is very promising for non-destructive and continuous soil volumetric water content measurement monitoring in a laboratory. The relationship between the soil volumetric water content and the dielectric constant of soil media (standard sand) was expressed by a single regression ewe independent of soil texture at a small experimental error. Also the derived regression curve coincided well with that obtained by Topp curve.
A Study on Correlation between Soil Properties and Parameters of Soft Clay in Honam Coastal Region
Kim Jong-Ryeol ; Choo Youn-Woo ; Kang Hee-Bog ; Kim Gyo-Jun ; Lee Sang-Hun ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 371~379
Soil investigation data at 7 different locations around Honam costal region were analyzed and experimental correlations between soil properties and parameters of soft clay were presented. Most soils were classified as CL and CH by the Unified Soil Classification System and were unstable structurally because the water contents were generally greater than the liquid limits. The compression index has good correlations with water content, liquid limit and initial void ratio. The trend of these correlations were similar to the Skempton equation Cc = 0.009(LL -10) and other studies for Korean soft clays but the constants were small different. The slope of these correlations for Honam costal region were slightly greater than those for Kyunggi costal region and Kyungnam costal region. The correlation coefficient (R) between the liquid limit and the plastic index is 0.93. It is seen that not only the water content and the liquid limit but also the water content and the initial void ratio are correlate, therefore the experimental equations were presented for the practical purpose.
Chemical Weathering Deterioration of Oya Tuff and Its Alteration to Zeolitic Materials
Choo Chang Oh ; Jeong Gyo-Cheol ; Oh Dae Yul ; Kim Jong-Tae ; Seiki T. ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 381~390
This study was performed to relate the weathering properties of Oyaish tuff from Japan to mechanical properties of rocks in terms of mineralogical alteration and chemistry. The tuff is composed of clinoptilolite, quartz, feldspars, mordenite, opal C-T, and smectite. Since fresh tuff contains approximately
zeolite, it is expected that the rock is subjected to weathering process ascribed to water contents on earth surface, significantly reducing mechanical strength of tuff. It is also anticipated that weathering process and properties may be different even in the same rock mass, due to the differences in local mineralogy, chemistry and microtextures in tuff.
Application of the Artificial Recharge to Reduce the Ground-water Drawdown of the Riverbank Filtration
Lee Dong-Kee ; Park Jae-Hyeoun ; Park Chang-Kun ; Yang Jung-Suk ; Nam Do-Hyun ; Kim Dae-kun ; Jeong Gyo-cheol ; Choi Yong-sun ; Boo Sung-an ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 391~400
Excess pumping on the river bank filtration well causes the over drawdown in the protected area of bank, which may make many problems such as soil water contents, Pumping head in the irrigated land, and it needs more irrigation and development of the deeper irrigating well. In this study the installation of the artificial recharging well was suggested to reduce the excess draw down in the protected land. Artificial recharging wells were applied at the bank filtration site of Changwon city by using Visual-MODFLDW. The optimized conditions are calculated that the recharging well is located about loom apart from the pumping well, and the recharging rate is
of the pumping yield.
Variations of Engineering Geological Characteristics of the Cretaceous Shale from the Pungam Sedimentary Basin in Kangwon-do due to Freezing-Thawing
Jang Hyun-Shic ; Jang Bo-An ; Lee Jun-Sung ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 401~416
We have collected shale specimens from the Pungam Basin in Kangwon province and investigated change of physical properties by freezing and thawing in water as well as in acidic fluid. The temperature range was
. Specimens were frozen for 12 hours and thawed in water for 8 hours. Then, they were saturated in the vacuum chamber for 4 hours to make specimens fully saturated. This procedure was 1 cycle. We have measured absorption, ultrasonic velocity, shore hardness, slake durability and uniaxial compressive strength at every 5th cycles. The physical properties increased or decreased as freezing and thawing cycles increased. Uniaxial compressive strength decreased by 0.40MPa per cycle in water and by 0.48MPa in acidic fluid. Elastic constant also decreased by 0.21GPa per cycle in water and by 0.30GPa in acidic fluid. Absorption increased by
per cycle in water and acidic fluid, respectively. These results indicate that decrease in uniaxial compressive strength, elastic constant and absorption by freezing and thawing in acidic fluid is more rapid than in water. Ultrasonic velocities, shore hardness and slake durability show no differences in water and acidic fluid. When we compared our results with the temperatures in the Hongchon during the winter season,
cycles may be equivalent to 1 year.
Calculation of the Yield of Bank Filtration by Using the Horizontal Collector Wells
Chung Ji-hoon ; Park Jae-hyeon ; Park Chang-kun ; Yang Jung-suk ; Kim Dae-kun ; Jeong Kyo-cheol ; Choi Youg-sun ; Bu Sung-an ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 417~427
The horizontal collector well is used to treat some weak points of the vertical well in the bank filtration site. In this study two empirical formulas(Milojevic and Petrovic) are selected to examine the applicability for calculating the yield of the horizontal collector. And they are compared with the compute simulation results for multiple wells. Milojevic empirical formula which considers the conditions such as aquifer, well location, the diameter of screen etc. is more applicable than Petrovic formula. Draw-down characteristics of horizontal collector was well simulated by using the computer simulation for multiple wells. The results are well agreement with Milojevic formula, and the draw-down and the retention time of the horizontal collector can be controlled by adjusting the angle of lateral screens.
Study on Analysis for the Slope Monitoring Performance at the Whangryeong Mountain Site
La Won Jin ; Choi Jung Chan ; Kim Kyung Soo ; Cho Yong Chan ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 429~442
Landslide of the Whanpyeong Mountain which was occurred at Busan Metropolitan City in 1999 belongs to the category of plane failure. Automatic monitoring system to measure horizontal displacement, pore pressure change and load change has operating from reconstruction stage for evaluating rock slope stability (August, 2000
Feburuary, 2002). As a result of the analysis on the monitoring performance data, it is suggested that infiltrated rain water from pound surface discharges rapidly through cut-slope because pressure head of water decreases rapidly after rainfall while rise of pore pressure is proportional to the amount of rain water. As a result of data analyses for inclinometers and load cells, it seems that slope is stablized be cause ground deformation is rarely detected. The areas especially similar to the study site where landslide is induced by heavy rain fall, change of pore pressure is rapidly analyzed using automatic monitoring system. Therefore, it is considered that automatic monitoring system is very effect for slope stability analysis on important cut-slopes.
A Prediction Model of Landslides in the Tertiary Sedimentary Rocks and Volcanic Rocks Area
Chae Byung-Gon ; Kim Won-Young ; Na Jong-Hwa ; Cho Yong-Chan ; Kim Kyeong-Su ; Lee Choon-Oh ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 443~450
This study developed a prediction model of debris flow to predict a landslide probability on natural terrain composed of the Tertiary sedimentary and volcanic rocks using a logistic regression analysis. The landslides data were collected around Pohang, Gyeongbuk province where more than 100 landslides were occurred in 1998. Considered with basic characteristics of the logistic regression analysis, field survey and laboratory soil tests were performed for both slided points and not-slided points. The final iufluential factors on landslides were selected as six factors by the logistic regression analysis. The six factors are composed of two topographic factors and four geologic factors. The developed landslide prediction model has more than
of prediction accuracy. Therefore, it is possible to make probabilistic and quantitative prediction of landslide occurrence using the developed model in this study area as well as the previously developed model for metamorphic and granitic rocks.
A Study on Shear Resistance Effect along Marginal Region of Sliding Mass using 3D Slope Stability Analysis
Seo Yong-Seok ; Ohta Hidemasa ; Chae Byung-Gon ; Yoon Woon-Sang ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 451~460
The strength of sliding plane is usually assigned on the whole sliding plane with same value in 2D limit equilibrium slope stability method. However, the potential sliding plane is divided into two or three parts which have different sliding resistances. According to the calculation results of 3D slope stability analyses using 4 types of slope cutting models, marginal sliding resistance could affect the safety of slope significantly. In this calculation two kinds of the sliding plane strengths were applied differently to the parts of bottom and margin of the model slope. The effect of marginal resistance was calculated quantitatively. In case of lower sliding resistance of the bottom, the safety factor becomes low in a margin cutting model. However, in case of higher sliding resistance of the bottom, the safety factor decreased slightly in a lower part cutting model and increased in a upper margin cutting model.
A Study on Hydraulic Characteristics of Rock Joints Dependant on JRC Ranges
Chae Byung-Gon ; Seo Yong-Seok ; Kim Ji-Soo ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 461~468
In order to characterize hydraulic property dependant on join roughness in rock mass, this study computed permeability coefficients on each range of joint roughness coefficient (JRC) suggested by Barton(1976). For a quantitative analysis of roughness components spectral analysis using the fast fourier transform was performed to select effective frequencies on each PC range. The results of spectral analyses show that low ranges of the JRC are mainly composed of low frequency domain, while high ranges of the JRC have dominant components at high frequency domain. The inverse Fourier transform made it possible to generate joint models of each JRC range using the effective frequencies of roughness spectrum. The homogenization analysis was applied to calculate permeability coefficient at homogeneous microscale, and then, computes a homogenized permeability coefficient (C-permeability coefficient) at macro scale. Therefore, it is possible to analyze accurate characteristics of permeability reflected with local effect of facture geometry. According to the calculation results, permeability coefficients were distributed between
. In cases of sheared joint models permeability coefficients were plotted between
, showing irregular distribution of permeability coefficients on each IRC range. The differences of permeability coefficients for the same aperture models or for the sheared joint models indicate that changes of roughness pattern influence on permeability coefficients. Therefore, the effect of joint roughness should be considered to characterize hydraulic properties in rock joints.
Effect of Well Depth, Host Rocks and Mineralization Zone on Hydrochemical Characteristics of Groundwater in the Umsung Area
Jeong Chan Ho ; Lee Byung Dae ; Sung Ig hwan ; Cho Byung Uk ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 469~485
The purpose of this study is to investigate the hydrochemical characteristics of groundwater in the Umsung area, and to elucidate the effect of host rock type, well depth and mineralization zone on the groundwater chemistry. The geology of the study area consists of Jurassic granite and Cretaceous sedimentary rocks, which are bounded by a fault. Most of shallow groundwaters exploited in the Jurassic granite area are used for agricultural purpose, whereas the deep groundwaters in the Cretaceous sedimentary rocks are used for a drinking water. The shallow groundwater shows weak acidic pH, the electrical conductivity ranging from
, and the chemical type of
. A few of shallow groundwaters are contaminated by nitrate, and show high concentration of Fe, Mn and Zn, that reflects the effect of a mineralization zone. The deep groundwater shows neutral to weak alkaline pH, higher electrical conductivity than that of shallow groundwater, and the chemical type of
. The seepage water from the abandoned mines does not have the characteristics such as acidic pH, high concentration of heavy metals and high sulfate content. The hydrogen and oxygen isotopes of groundwater indicates an altitude effect of the recharge area between deep groundwater and shallow groundwater. In conclusion, the chemical composition of groundwater complicately reflects the effects of their host rocks, well depth, agricultural activity and mineralization zone in the study area.
Engineering Characteristics of Soil Slopes Dependent on Geology - Hwangryeong Mt. District, Busan -
Kim Kyeong-Su ; Lee Moon-Se ; Cho Yong-Chan ; Chae Byung-Gon ; Lee Choon-Oh ;
The Journal of Engineering Geology, volume 14, issue 4, 2004, Pages 487~498
There is an increasing trend of construction works in mountainous areas by the urban development in Busan that is mainly composed of mountains. The study area, Hwangryeong Mt., is one of developing sites in the urban area, too. Landslides and cut-slope failures that occur large damages of human beings and the properties are influenced by soil characteristics as well as rock properties. This study analyzed geotechnical characteristics of soil dependent on geology at Hwangryeong Mt. where a large slope failure had been occurred in 1999. Geology of the study area is composed of the Cretaceous sedimentary rocks and volcanic rocks. Soil layer of the slopes can be grouped into sand mixed with clay and silt. The cohesion is plotted between
. The friction angles are distributed in the ranges between
, meaning soil bearing a high friction angle. The permeability coefficients are plotted between
, indicating fine sand and loose silt with a medium grade of permeability. The sedimentary rocks area shows relatively higher permeability coefficients than those volcanic rocks area.