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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Engineering Geology
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Journal DOI :
The Korea Society of Engineering Gelolgy
Editor in Chief :
Volume & Issues
Volume 2, Issue 2 - Oct 1992
Volume 2, Issue 1 - May 1992
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Effect of rock joint roughness on shear strength
The Journal of Engineering Geology, volume 2, issue 1, 1992, Pages 1~18
Rock mass having discontinuous plane almost appear roughness which have a great effect on shear strength. Rocks of studied object choose granites (15 samples), gneisses (7 samples), and andesites (1 sample). The purpose of this study was to clarify shear strength of discontinuous planes as value of shear strength angle (
), critical stress of roughness (
) and shear failure strength (
). 1. Roughness decrease from
that is, friction angle has the highest value at first stage and has the lowest value at the last stage. 2. Critical angle of roughness distribution within
), JRC(Joint Roughness Coefficient) is less than 14 and lies distribution range of boundary is following:
. 3. When the roughness critical stress(
) is from 0.1 to 3 .56Mpa, shear failure strength of roughness (
) is from 0.01 to 0.46Mpa, shear strength(
) of discontinuous plane is from 3.65 to 39.11 Mpa. If loading is higher than these values, collapse and sliding will occur on the rock mass.
Geotechnical treatment for the fault and shattered zones under core foundation of fill dam
The Journal of Engineering Geology, volume 2, issue 1, 1992, Pages 19~35
aThe elastic properties of the fault zone (width; 3~12m), the shattered zone (width; over 40m) and the fresh rock zone distributed under the core foundation of fill dam in granitic gneiss have widely different range. The deformation moduli of the fresh rock zone, the fault zone and the shattered zone obtained from in situ rock tests - Plate Load Test and Bore Hole Deformation Test - show a range of
, respectively. The differential settlements hetween the fault zone and the fresh rock zone are expected after the dam construction. Therefore, the displacement of foundation and concrete fill are evaluated using FEADAM 84 program of finite element analysis. The geometric distribution of discontinuifies obtained from the site mapping and drilling is considered in the finite element analysis. The analysis shows that the differential settlements between the fault zone and the fresh rock zone is about 6cm, while that of concrete fill is within 0.5cm.
A study on the variation of rock properties of weathered granites
The Journal of Engineering Geology, volume 2, issue 1, 1992, Pages 36~46
Granite core samples and bulk samples were first subjected to petrographic examination to determine weathering degrees. Secondly, their physical or mechanical properties including specific gravity, porosity, sonic wave velocity and uniaxial compressive strength were measured. The results were correlated to investigate the influences between properties including physical and mechanical properties, weathering degrees, and rock textures. Porosity and P wave velocity were found the most useful indices in determining the weathering degrees of granites.
Delineation of water seepage in earth-fill embankments by electrical resistivity method
The Journal of Engineering Geology, volume 2, issue 1, 1992, Pages 47~57
Geophysical methods applied to water seepage problem in earth-fill embankment attempt to detect and map the estimate of size and depth of the seepage path. Seepage zones generally produce lOW resistivity anomalies due to high saturation of water. Dipole-dipole resistivity surveying technique, which is actually a combined sounding-profiling procedure, was used to delineate the seepage path through this study. In this study, the finite difference methods to solve the electric potential distribution in 2 112 dimension, was adopted as the numerical scheme for the forward problem. Second order Marquart's method, one the iterative damped least square methods, was selected for the automatic inversion. The computer program was implemented in FORTRAN 77 for 1 6-bit personal computer. In this paper, we present a case history which illustrates the application of dipole-dipole resistivity method to the delineation of water flow in earth-fill structures. Also the automatic two-dimensional resistivity inversion was applied to a field data where the interpretive advantages of the program become evident.
Barometric Efficiency study for the aquifer characteristics of Taegu region
The Journal of Engineering Geology, volume 2, issue 1, 1992, Pages 58~69
Change in atmospheric pressure produce sizable fluctuafions in wells penetrafing confined aquifers. The relationship is inverse; that is, increases in atmospheric pressure produce decreases in water levels, and conversely. When atmospheric pressure changes are expressed in terms of a column of water, the raflo of water level change to pressure change expresses the barometric efficiency of an aquifer. In the study area, aquifers are developed in the fractures, joints, bedding planes and occasionally in solufion cavities of marl interbeds. The barometric efficiency of the aquifer varies from 8 to 90%, indicating that Confined, Unconfined and Semi-Confined condifions exist locally. The barometric efficiency is characteristic of the aquifer itself and observed in the field is inversely proportional to specific storage or the storage coefficient. It is remalned in question to derive the relationship between B.E. and S.
Geological structure and groundwater resources of Cheju and Oahu Island
The Journal of Engineering Geology, volume 2, issue 1, 1992, Pages 70~91
Cheju and Oahu island are similar in geology, characterized by same types of volcanic activities during the late Tertiary to the early Quaternary. The occurrence of groundwater in both islands depend on two basic elements, permeability of volcanic rocks and precipitation. However, groundwater occurrence in Oahu is much more controlled by dike complex in the regional volcanic rocks. There are two different types of groundwater in both islands. One is perched groundwater standing at any high altitude, and the other is basal groundwater developed near the coastal area. The groundwater quality of Cheju island is good in general for drinking. But many wells near the eastern coastal area are salt intruded due to over pumping activities and the area of salt water intrusion has increased landward from the year of 1970. This feature of salt water contamination is similar at Pearl Harbour in Oahu island. In order to prevent this salt water contamination into fresh groundwater reservoir on Cheju island, it is urgently asked to make groundwater flow study along the coastal area on terms of groundwater potentials and their maximum ultimate exploration.
Abstracts of papers presented at the first annual society meeting
The Journal of Engineering Geology, volume 2, issue 1, 1992, Pages 92~102