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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 3, Issue 3 - Dec 1993
Volume 3, Issue 2 - Sep 1993
Volume 3, Issue 1 - Apr 1993
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Relationship between shear behavior characteristics and mechanical parameters of fractures
The Journal of Engineering Geology, volume 3, issue 1, 1993, Pages 1~20
In this study, laboratory direct shear tests on 37 core specimens of gneiss were performed to examine the characteristics of shear behavior on fractures by using a portable direct shear box. The multi-stage shear testing method was used and normal stress applied to specimens ranges from 5.60 to
. On the basis of test results, the empirical equations for the shear strength on fractures were suggested. The methanical parameters that can influence the shear behavior were derived and compared between each parameter. The values of shear stiffness have a trend showing rapid increase with the increase of normal stress and joint roughness coeffident, and the average value of secant shear stiffness for all specimens is about
under the range of normal stress applied in this test In addition, the relationship between the length of specimen and shear stiffness is inversely correlated due to the size effect. Therefore, even the specimens with the same joint roughness coeffident show the trend of decreasing shear stiffness in case of the specimens being the longer length.
Structure and physical properties of Earth Crust material in the Middle of Korean Peninsula(2) : Comparison between elastic Velocity and point-load of core specimen of sedimentary rocks.
The Journal of Engineering Geology, volume 3, issue 1, 1993, Pages 21~37
In order to investigate the correlation of sedimentary rock properties. specific gravity, porosity, water content, sonic wave velodty, and point4oad strength index of core samples of limestones, sandstones and shales were measured. The relationships between density and velocity show
of regression equation for sandstones and
for shales and <
for limestones. Seismic wave velocity of shales which have high density is lower than that of sandstones, and this seems to be an effect of bedding in shale. P-wave velocity and S-wave velocity of limestones, sandstones and shales show the linear relationships as a whole. The regression equations are respectively calculated
and the correlation coefficients of the velocity show r= 0.86 in sandstones, r= 0.75 in limestones and r=0.86 in shales. According to the point4oad strength test for limestones, point4ord strength anisotropy was not so dear even though the specimens show generally the banded structure. Variations of dip angle of bedding whihin the range
does not have much influence upon the diametral strength index and axial strength index. From the result of point load test, P-wave velocity increases with point4ord strength index but the regression equations are
and their correlation coefficient is low.
Application of universal kriging for modeling a groundwater level distribution 1. Intrinsic random function of order k
The Journal of Engineering Geology, volume 3, issue 1, 1993, Pages 39~49
Intrinsic random function of order k(IRF-k) was used to estimate groundwater levels of nonstationaav random functions. The accuracy of IRF-k was compared to that of ordraarv krigrng assuming that the data of groundwater levels compose a stafionarv random function. Cross validation and statistical errors show that IRF-k is superior to orcinarv '(riging for the estimation of water levels. IRF-k and ordinary kriging made different contour and 3-D surface maps. The maps of IRF-k are more accurate than those of ordinary kriging.
Application of universal kriging for modeling a groundwater level distribution 2. Restricted maximum likelihood method
The Journal of Engineering Geology, volume 3, issue 1, 1993, Pages 51~61
Restricted maximum likelihood(RML) method was used to determine the parameters of generalized covariance, and universal krigig with RML was applied to estimate a groundwater level distribution of nonstationarv random function. Universal kriging with RML was compared to IRF-k with weighted least squares method for the comparison of their accuracies. Cross validation shows that two methods have nearly the same ability for the estimation of groundwater levels. Scattergram of estimates versus true values and contour maps of groundwater levels have nearly the same results. The reason why two methods produced the same results is thought to be the non-Gaussian distribution and the snaall number of sample data.
The geology and the flow regime of the Mortagne
The Journal of Engineering Geology, volume 3, issue 1, 1993, Pages 63~74
There is many differences in morphology according to the geology in the basin of the Mortagne. The upstream where the substratum is composed of mainly the sandstone and conglomerate has the mountainous relief and the steep slope, so it is covered with the forest in regard to land use. Also the dimate influenced by the topography brings much of the predpitation and causes low temperature. The monthly oufflow and the peak flow are different between the upstream and downstream by these factors. It seems to be the very common and ordinary phenomena but this study is aimed at presenting the possibility of the quantitative amrnation between the factors and the flow regime in the future.
Measuring technique of the slope on a topographic map
The Journal of Engineering Geology, volume 3, issue 1, 1993, Pages 75~81
Four tecbniques are treated. The technique using the area and the perimeter is very easy but considerable error can be made and commonly the technique using grid is used. Particularly, simaar technique using computer makes possible to represent the slope at each point of the grid and to compare with other data. The tehcnnique using vector product, with which a cuuved surface can be measured directly by segmenting by triangles, is useful but it represent considerable error where the relief is rugged.
Abstracts of papers presented at the third annual society meeting
The Journal of Engineering Geology, volume 3, issue 1, 1993, Pages 83~89