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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 7, Issue 3 - Dec 1997
Volume 7, Issue 2 - Aug 1997
Volume 7, Issue 1 - Apr 1997
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Feasibility of Choryeong Tunnel and Han River Section in Kyungbu Canal
The Journal of Engineering Geology, volume 7, issue 1, 1997, Pages 1~10
The construction of Kyungbu canal connecting Han and Naktong rivers is needed to facilitate the carriage of goods and enhance the economic growth. The two rivers are liflked by the Choryeong tunnel with 20.5 km length and 125 m altitude. Seven locks involving of 25 m lifting height are planned to reach the tunnel from Shingok dam along the Han river. The tunnel and dams are located favorably by topographic and geologic map analysis. The water needed to fill the chamber of high lock will he supplied by construction of additional dams above Chungju-dam and/or intmduction of water-saving lock system.
The Journal of Engineering Geology, volume 7, issue 1, 1997, Pages 11~26
Through the Korea-Germany joint project, a novel method, that is, an optical Corescanner (Stereophotogramrnetry) of acquisition, evaluation and display of struct-ural elements of drill cores has heen realized. AH scannable cores can he digitally stored on a storage device(dat tape, optical disc etc.) and available for further an-alysis using diverse software facilities. The use of this scanning technique was d-emonstrated on the cores derived from the metamorphosed sedimentary rocks in our country. Recent studies showed a great potential of using the Corescanner with high resolution not only for avoiding ambiguities of drill log interpretation due to the capability of accurate quantative analysis of structural elements, but also for replacing the cores themselves as a data-base one via completely copying of the core outlook.
A Field Application of Crosshole Seismic Survey to the Detection of Tunnel
The Journal of Engineering Geology, volume 7, issue 1, 1997, Pages 27~36
This paper shows that crosshole seismic survey allows to detect even a small size of underground tunnel (about 2m
2m). Such a small tunnel (e.g. infiltration tunnel) causes diffraction, as the seismic wave propagates, which results in distinctive variations of traveltime and amplitude of the first arrivals. This effect (or tunnel effect) is a typical indicator for the existence of tunnel and thereby an information about the tunnel location can be obtained. It was shown that the tunnel effect illustrated by numerical modeling (FDM) could be also observed in field measurements. The depth and shape of the tunnel were determined by a simplified processing method based on the use of amplitude variation of the first arrivals. The estimated location of the tunnel was well matched to that of the real tunnel.
A Study on the Stability Analysis of Revetment Structure Subjected to the Wave and Soil Pressure
The Journal of Engineering Geology, volume 7, issue 1, 1997, Pages 37~52
This paper discribes the practical application of stability analysis on the revetment structures, and four different sections of revetment structures are considered in this study. As a result of stability analysis, the the section of inclined revetment with T.T.P. block shows the highest safety factor against to the sliding failure of cap concrete block, while the section of inclined revetment with rubble stone shows the highest safety factor against to the straight and circular sliding failure. And the safety factors are increased by increasing of the rigidity of covered materials and by decreasing of the slope angle. For the safety factor of overturnning and bearing capacity, the section of inclined revetment structures shows higher safety factors than the section of vertical structures, and the safety factors are increased by decreasing of the slope angle and by increasing of the bottom width of the structures.
Characteristics of Natural and Experimental Fracture Propagation in Rocks
The Journal of Engineering Geology, volume 7, issue 1, 1997, Pages 53~62
Fracture mechanics properties of rock materials can he applied to predict the distribution of natural fractures in rock masses, and also to assess the safety of rock slopes and underground structures. In this study, rock fracture toughness and other fracture rrechanics properties of sorne lithologies showing apparently rock-property-controlled distribution of natural fractures were measured. Propagation behaviors of natural and experirnental fractures were also characterized both qualitatively and quantitatively, in terns of the propagation types and sorne statistical parameters. It was concluded that the application of fracture mechanics theories to the ge6logic materials should be based on the geological background and evidences.
Discrimination of Local Microearthquakes and Artificial Underground Explosions on the Basis of Time-Frequency Domain
The Journal of Engineering Geology, volume 7, issue 1, 1997, Pages 63~79
In this study, our purpose is to develop a technique to discriminate artificial explosions from local microearthquakes on the basis of time-frequency domain. To obtain spectral features of artificial explosions and microearthquakes, we used 3-d spectrograms(frequency, time and amplitude) because this is a useful tool to study the frequency content of entire seismic waveforms observed at local and regional distances (e. g., Kim et al., 1994). P and S waves from quarry blasts show that frequency content of dominant amplitude appeared above 10 Hz and Rg phases that are observed at near distance ranges. But P and S waves from microearthquakes have more broad frequency content as well as below 10 Hz. And for discrimination, Pg/Lg spectral ratio is performed below 10 Hz. In order to select time windows we computed group velocity using multiple filter method(MFM) and removed free surface effects from all 3-components data for improving on data quality. Next step, we computed Fast-Fourier transform, and a log average spectral amplitude over seven frequency bands : 0.5 to 3, 2 to 4, 3 to 5, 4 to 6, 5 to 7, 6 to 8 and 8 to 10 Hz. The best separation is observed from 6 to 8 Hz.
Paleoseismological Study on the Mid-northern Part of Ulsan Fault by Trench Method
The Journal of Engineering Geology, volume 7, issue 1, 1997, Pages 81~90
The Korean historical 1iteratures describe that great eaathquakes with destructive damages occurred mainly in Kyongju-Ulsan areas during the period of 1 to 8 century and 16 to 17 century. It seems that the Ulsan fault system shows a little curved ttend with N-S strike in the southern part and diverges into three directions from the mid-northern lart of the fault. The dominant trends of the lineaments are NNE-SSW, NE-SW and NS directions. Trench excavation in the mid-northern part of the Ulsan fault shows thrust facies cutting slope deposit containing a compacted laminar structure whose origin may due to severe cryogenic activities of the last cold period(ahout 25OOO B.P.). Detailed observation of the facies gives some evidences related to two earthquake episodes of thrust components along the Ulsan fault system. Fault outcrop and trench study suggest that Ulsan fault seems to he one of the active fault which has reworked several times even in the late Quaternary.