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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Journal of Engineering Geology
Journal Basic Information
Journal DOI :
The Korea Society of Engineering Gelolgy
Editor in Chief :
Volume & Issues
Volume 6, Issue 3 - Dec 1996
Volume 6, Issue 2 - Aug 1996
Volume 6, Issue 1 - Apr 1996
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Characterization of Fracture Transmissivity for Groundwater Flow Assessment using DFN Modeling
The Journal of Engineering Geology, volume 6, issue 1, 1996, Pages 1~13
The fracture transmissivity(
) is the most important parameter of fracture in assessing groundwater flow in fractured rock masses by using the DFN(Discrete Fracture Network) modeling.
, the most sensitive parameter m DFN modeling, is dependent upon aperture, size and filling characteristics of each fracture set. In the field test, the accuracy of
can be increased with Borehole Acoustic Scanning (Televiewer) and Fixed Interval Length(FIL) test in constant head.
values measured from FIL test was modified and estimated by each fracture set on the basis of the Cubic Law and the information of aperture and filling characteristics obtained from Televiewer. The modified
results in the increase of confidence and reliability of modeling results including the amount of tunnel inflow.And, this approach would reduce the uncertaintity of the assessment for groundwater flow in fractured rock masses using the DFN modeling.
A Study on the Limitations in the Field Application of Seismic Mini-tomography
The Journal of Engineering Geology, volume 6, issue 1, 1996, Pages 15~22
Frequency content of seismic waves observed in field seismic survey in Korea has almost not exceeded 4kHz(wave length 1m). The limited frequency content not only restricts the minimum size of objects which can be surveyed in seismic tomogrpahic application, but also makes a fundamental limit in the resolution of tomogram. This paper shows the resonable result obtained by confirmimg and resolving the problems which can be occured m measuring procedure for the small - sized section through field application. Seismic tomographic field survey was performed for a concrete construction for railroad bridge in Korea, and to this the tomographic measurements for the stone-build foundation construction for a bell house of church in Germany were compared.
A Method for Assessing Structural Safety of Ground-Support Systems in Underground Rock Cavern
The Journal of Engineering Geology, volume 6, issue 1, 1996, Pages 23~31
A stress redistribution process in ground support system is mpdeled taking into consideration of load transfer mechanism of unbalanced load within shotcrete in a rock cavern constructed by NATM. The corresponding analysis model for ground support system is proposed and the elastic behavior of the shotcrete is studied. The effect on the support system due to variation of several design parameters is analysed with the proposed model. The suggested model yields considerably reduced maximum compressive stresses in shotcrete. Both the pressure coefficient in horizontal direction and the elastic modulus of rock mass govern overall responses, whereas the variation of the properties in support system shows a little difference in system responses. Interaction equations for evaluating safety factors for structural members are suggested. The result of this study can be used in the structural safety assessment of underground structures.
A Technique of the Accurate Estimation for the Earthquake Parameters Using a Single Station of 3-component
The Journal of Engineering Geology, volume 6, issue 1, 1996, Pages 33~43
In this study, hypocentor parameters of some local and regional earthquakes and explosions, including focal depth and origin time, were redetermined by using a single station of three-component. We attempt to do the job by the combination of polarization analyses, by which azimuths and trial epicenters of earthquakes can be figured out, and a layered constant velocity model, on the basis of which theoretical travel times can be computed to match a series of input seismic phases of the event. Magnitudes were determined by using coda duration. Results, which correspond to the least misfit, showed that the average focal depth of all earthquakes in this study is around 15km, which fits well to that by investigation (Kang and Choi, 1993).
Statistical Properties of Earthquake 'Quanta'
The Journal of Engineering Geology, volume 6, issue 1, 1996, Pages 45~49
It is shown that the concept of 'earthquake quanta' proposed by Sacks and Rydeleck (1995) may be expressed in a more general form. The property that for large earthquakes the stress drop is approximately a constant, while for small events the stress drop is proportional to the moment seems independent of the failure criteria of the earthquake quanta. The physical significance of the concept of earthquake quanta is discussed in the perspective of 'seismon'.