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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 17, Issue 4 - Dec 2007
Volume 17, Issue 3 - Sep 2007
Volume 17, Issue 2 - Jun 2007
Volume 17, Issue 1 - Mar 2007
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Dispersion Curves and Dispersion Characteristics Expected from Different Borehole Environments
Zhao, Weijun ; Kim, Yeong-Hwa ; Kim, Jong-Man ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 329~337
For seven NX sized borehole models constructed from physical property data for representative geology in Korea, dispersion curves were derived and compared between models having different physical parameters. By comparing and analyzing the dispersion curves obtained from different sources (monopole and dipole) and different borehole sizes (76 mm and 150 mm), dispersion characteristics in sonic log could be understood better, particularly in the case of slim hole sonic log.
Petro-mineralogical and Mechanical Property of Fault Material in Phyllitic Rock Tunnel
Lee, Kyoung-Mi ; Lee, Sung-Ho ; Seo, Yong-Seok ; Kim, Chang-Yong ; Kim, Kwang-Yoem ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 339~350
Content, swelling, concentration, drainage of clay are critical factors that could control rock failures as well as discontinuous geological structures like faults and joints. Especially, the proportional components of clay minerals can be one of few direct indicators to a rock failure caused well by rainfall. Criticality of the role of clay mineral contents gets bigger in the slope and tunnel design. This study, using a horizontal boring core of pelitic/psammitic phyllite from the OO tunnel construction site, aims to investigate mineral composition changes related to fault distribution and their mechanical effects to the activity of these discontinuous layers (i.e., clay-filled fault layers), and eventually to define correlation among rock compositions, weathering products and rock instabilities. Field survey and lab tests were carried out for the composition and strength index of fault clay minerals within the core samples and microscopic analysis of fresh and weathered rock samples.
Determination of the Overconsolidation Ratio using the Piezocone Penetration Test
Lee, Ki-Se ; Shin, Won-Tae ; Goo, Nam-Shil ; Kim, Hak-Joon ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 351~358
Using the results of the Piezocone Penetration Test(PCPT) which were executed at the Yangsan-Mulgum site, the applicability of the interpretation methods far estimating the OCR(Overconsolidation Ratio) of soft clay was evaluated. At the same time, the results from the laboratory tests using the total of 172 undisturbed soft clay samples taken from the 44 bore holes of the Yangsan-Mulgum site were used to compare the OCR values obtained from the consolidation test with those from the PCPT. The relationship between the predicted overconsolidation ratio(
) using the PCPT and the measured overconsolidation ratio(
) from the laboratory consolidation tests are investigated and presented in this study. The
by using the Powell et al.'s method for non-fissured clay from the results of the PCPT shows the best relationship with the
obtained from the laboratory consolidation test.
Calculation of Deterioration Depth of Major Rock Type Slopes caused by Freezing-Thawing in Korea
Kwon, O-Il ; Baek, Yong ; Yim, Sung-Bin ; Seo, Yong-Seok ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 359~365
Freezing and thawing cycle is one of the major weathering-induced factors in the mechanical weathering of the rock mass. This natural process accelerates rock weathering process by breaking down the parent rock materials and makes soil or weathered rock formation in a rock slope surface zone. It can also cause reduction of the shear strength in slopes. It is important to calculate the deterioration depth caused by freezing-thawing for a slope stability analysis. In this study, deterioration depths of rock slope due to freezing-thawing were calculated using the 1-D heat conductivity equation. The temperature distribution analysis was also carried out using collected temperature distribution data for last five years of several major cities in Korea. The analysis was performed based on the distributed rock types in study areas. Thermal conductivities, specific heats and densities of the calculation rocks are tested in the laboratory. They are thermal properties of rocks as input parameters for calculating deterioration depths. Finally, the paper is showing the calculated deterioration depths of each rock type slopes in several major cities of Korea.
Relationship between Hydrogeological Characteristics and Subsurface Geology in Central Busan Megacity
Ryu, Sang-Hun ; Hamm, Se-Yeong ; Cha, Yong-Hoon ; Jang, Seong ; Jeong, Jae-Hyeong ; Son, Moon ; Kim, Ki-Seok ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 367~379
This study intended to evaluate hydrogeological characteristics in relation to subsurface geology data obtained from borehole, groundwater level, borehole flowmeter test, and field hydraulic tests. The regression equation of groundwater level (Y) versus ground elevation (X) is expressed by Y=0.75X-7.00 with quite high correlation coefficient of 0.78. Relationship between groundwater level and thickness of landfill, alluvium, and weathered zone results in higher correlation of groundwater level (Y) versus natural log value of weathered tone (A) than other correlations, with the regression equation Y= exp(9.974A)-14.155. The result of groundwater flow measurement in the boreholes indicates that groundwater flows towards between south and southwest, and this approximately agree with regional distribution of groundwater levels.
Analysis of Talus Slope Stability using 2D FEM and 3D Limit Equilibrium Method
Lee, Kyoung-Mi ; Kim, Sung-Kwon ; Seo, Yaung-Seok ; Lee, Sun-Bok ; Kim, Dong-Hyun ; Kim, Do-Sik ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 381~391
A series of talus slope stability analyses were carried out using 2D FEM and 3D limit equilibrium methods for this study. The FEM analyses on Phase 2 were performed to delineate failure depths based on stress distributions for each slope. The results revealed that the failure surface exist in the colluvium layer of about 3-10 m thickness. Three dimensional models, derived from the FEM analyses and geological field survey, were made for the use in a 3D limit equilibrium analysis. The result shows that all the talus slopes are stable under dry condition, but unstable under saturated condition due to heavy rain.
Risk Assessment of the Road Cut Slopes in Gyeoungnam based on Multiple Regression Analysis
Kang, Tae-Seung ; Um, Jeong-Gi ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 393~404
The purpose of this study is to capture the essentials in survey and evaluation scheme which are able to assess the hazard of a rock slope systematically. Statistical analysis are performed on slope instability parameters related to failure of the rock slope. As the slope instability parameters, twelve survey items are considered such as tension crack, surface deformation, deformation of retaining structures, volume of existing failures, angles between strike of discontinuity and strike of cut slope face, angles between dip of discontinuity and dip of cut slope face, discontinuity condition, cut slope angle, rainfall or ground water level, excavation condition, drainage condition, reinforcement. A total of 233 road cut slopes located in Gyeongnam were considered. The stability of the road cut slopes were evaluated by estimating the slope instability index(SII) and corresponding stability rank. 126 rock slopes were selected to analyze statistical relation between SII and slope instability parameters. The multiple regression analysis was applied to derive statistical models which are able to predict the SII and corresponding slope stability rank. Also, its applicability was explored to predict the slope failures using the variables of slope instability parameters. The results obtained in this study clearly show that the methodology given in this paper have strong capabilities to evaluate the failures of the road cut slope effectively.
The Evaluation of Safe Yield Considered Interference Drawdown between Hot Spring Wells at Yecheon Hot Spring Area
Lee, Chol-Woo ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 405~409
There exist 5 wells drilled at the Yecheon hot spring area, the distance between the wells is about
. The safe yield of each well is controlled by interference drawdown between a pumping well and an observation well after pumping test. The well No. 2 and the well No. 5 are the closest, at the distance of 159 m; therefore interference drawdown between two wells was occurred considerably. The drawdown of the well No. 2 (an observation well) was 16.67 m; the drawdown of the well No. 5 (a pumping well) was 17.21 m. The degree of the interference is about 97% and the safe yield decreased from
. Significant interference between two wells is due to the fact that the aquifer has 1.5 dimensions.
Analysis of Landslide Hazard Probability for Cultural Heritage Site using Landslide Prediction Map
Kim, Kyeong-Su ; Lee, Choon-Oh ; Song, Yeung-Suk ; Cho, Yong-Chan ; Kim, Man-Il ; Chae, Byung-Gon ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 411~418
It is a very difficult thing to estimate an occurrence possibility location and hazard expectation area by landslide. The prediction difficulty of landslide occurrence has relativity in factor of various geological physical factors and contributions. However, estimation of landslide occurrence possibility and classification of hazard area became available correlation mechanism through analysis of landslide occurrence through landslide data analysis and statistical analysis. This study analyzed a damage possibility of a cultual heritage area due to landslide occurrence by a heavy rainfall. We make a landslide prediction map and tried to analysis of landslide occurrence possibility for the cultural heritage site. The study area chooses a temple of Silsang-Sa Baekjang-Am site and made a landslide prediction map. In landslide prediction map, landslide hazard possibility area expressed by occurrence probability and divided by each of probability degrees. This degree used to evaluate occurrence possibility for existence and nonexistence of landslide in the study site. For the prediction and evaluation of landslide hazard for the cultural heritage site, investigation and analysis technique which is introduced in this study may contribute an efficient management and investigation in the cultural heritage site, Korea.
Pollutant Monitoring of Abandoned Mines using the Leaching Test with Soils and Tailings
Kang, Mee-A ; Kim, Kwang-Tae ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 419~424
The contents were investigated by the monitoring survey from the soils and tailings caused by numerous abandoned mines in Korea. Cause heavy metals due to abandoned metal mines are raising significant environmental problems. But it is an important key such as a leaching and a transfer mechanism to evaluate contamination levels caused by abandoned mines. In this study the column test was carried in order to calculate a leaching level from soils and tailings. It was demonstrated that the leaching of Pb, Cd and Mn was expressed with similar behaviors and that of As and Cu was expressed with similar behaviors. For Zn, the leaching behavior was shown a serious leaching level with 40 mg/kg during the 45days. This was explained by Zn high contents of soils Zn in a natural world and ORP conditions where the leaching of Zn was occurred easily. Hence it was necessary that the survey of ORP was a key as well as total contents for the management of abandoned metal mines. We could estimate the chemical forms of heavy metals using the physical index such as ORP and pH and reduce the risk from heavy metals caused by abandoned metal mines.
Proposal of stability standards for slopes reclaimed by soils mixed with stone dust
Song, Young-Suk ; Kim, Kyeng-Su ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 425~434
In this paper, the stability standards of slopes reclaimed by soils mixed with stone dust were proposed to manage the stone dust as recovery soils. First of all, the mixed ratio between stone dust and natural soil is classified into 5 groups, and a series of soil test was performed in each group. As the results of tests, the shear strength and the maximum dry unit weight were increased in decrease of the mixed ratio of stone dust. On the basis of the investigation to the safety factor standards of embankment slopes in and outside the country, a slope stability rank of slopes reclaimed by mixed soils were divided into 3 stages such as unstable stage, attention stage and stable stage. The slope angle, the slope height and the mixed ratio with stone dust were proposed by the result of stability analysis of slopes reclaimed by mixed soils. As the result of slope stability analysis, the slope angle of 1 : 1.8 at the reclaimed slope should be constructed in case of the slope height of 10 m. Also, the slope angle of 1 : 1.8 and the mixed ratio of stone dust less than 50% should be constructed in case of the slope height of 15 m. The analysis result of reclaimed slope constructed inside the quarry is similar to that of reclaimed slope constructed on the open ground in same conditions of the slope angle, the slope height and the mixed ratio with stone dust. The proposed stability standards of slopes reclaimed by soils mixed with stone dust can be used practically at the quarrying site.
Characterization of Weathered Zone bearing Corestones through Scale Model Test
Woo, Ik ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 435~443
This study shows the prediction of the engineering properties of weathered zone bearing corestones through the engineering geological surveys and the scale model test in the laboratory. The window survey and the observation on the borehole core were peformed on three natural slopes in corestones area in order to analyse the distribution pattern and the geometrical properties of corestones. Natural corestones were crushed and abrased for the scale model test into less than 5 mm in maximum-2mm in average by the scale reduction ratio based on the size of natural corestones and the specimen size. Scale model tests were carried out on soil and plaster model specimens with different corestone content ratio - 0%, 10%, 20%. The direct shear test on soils shows that shear strength is increased by the increase of corestone content ratio. The increase of cohesion is, however, more important factor to the shear strength of soil for 20% corestone content ratio due to interlocking of crushed corestone particles. The plaster model test shows a tendance of increase of UCS and modulus of elasticity with increase of corestone content. The variation ratio of specimen property by change of corestone content ratio in plaster model test was applied to in situ properties in order to estimate the properties of weathered zone bearing corestones. So it could be predicted that the increase of corestone content to 10% and to 20% produce about 18% and 30% UCS's increase respectively.
Analysis on Statistical Relationship between Groundwater Quality and Geology
Kim, Jong-Tae ; Park, Sang-Joo ; Kang, Mee-A ; Choo, Chang-Oh ; Jeong, Gyo-Cheol ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 445~453
The purposes of this study lie on understanding characteristic water-rock interaction mechanisms of groundwater in the Geochang, Hapcheon, and Changryeong areas and establishing correlation between geological factors and groundwater chemistry by statistical tools. Based on the statistical results from the relationship between rock types and groundwater chemistry, fluorine is correlated with Fe and Al in the diorite area, whereas it is correlated with Cl and
in the andesite area. Hardness, total solids, and
show that they are closely related to each other in all rock types, especially with highest relationship in sedimentary rocks. Although it is generally acknowledged that TDS increases with depths of aquifer due to the long term water-rock interaction, no remarkable relationship between well depth and water chemistry is found in this study. It appears that hydrogeological system in the study area may be complex or the path of water-rock interaction is inconsistent with well depth.
Fracture Developing History and Density Analysis based on Grid-mapping in Bonggil-ri, Gyeongju, SE Korea
Jin, Kwang-Min ; Kim, Young-Seog ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 455~469
The study area, Bonggil-ri, Gyeongju, SE Korea, is composed of Cretaceous sedimentary rocks, and Tertiary igneous rocks and dykes. A research on fracture developing history and density distribution was carried out on well exposed Tertiary granites. The fractures developed in this area have the following sequence; NW-SE trending duo-tile shear bands (set a), NNW-SSE trending extensional fractures (set d), WNW-ESE trending extensional or normal fractures (set b), NE-SW trending right-lateral fractures (set c), WNW-ESE trending reverse fault reactivated from normal faults (set e) and NW-SE trending left-lateral faults reactivated from shear bands (set a) under brittle condition. According to the result of fracture density analysis, the fracture density in this area depends on rock property rather than rock age, and also higher fracture density is observed around fault damage zones. However, this high fracture density may also be related to the cooling process associated with dyke intrusion as well as rock types and fault movement. Regardless of the reason of the high fracture density, high fracture density itself contributes to fluid flow and migration of chemical elements.
Soil Characteristics according to the Geological Condition of Natural Slopes in Busan Area
Kim, Kyeong-Su ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 471~481
The Landslide in natural slope is occurred mostly by a heavy rain of the summer. This landslide is influenced in soil property of the surface than the rock mass. Soils in natural slope are created by weathering phenomena of the bedrock. These soils differed to the geological conditions such as sedimentary rock, metamorphic rock and volcanic rock. Therefore, estimation of landslide in natural slope is the most important analysis of the bedrock distributions and soil characteristics. This study analyzed the soil property to the natural slopes of Busan area where is distributed to volcanic rock, granite and sedimentary rock. Soil sample conducted various soil tests for estimate the soil physical property and soil engineering characteristics, and analysis of the correlation of geological conditions. In the experiment result, soils were mainly classified by a clayey sand. It is also established that
for wet density,
for angle of shearing resistance, and
for coefficient of permeability. From the physical parameter, the soils are estimated to the permeable ground with good shear strength, and soil properties are showed a differential tendency for each geological condition.
Geometric Analysis of Fracture System and Suggestion of a Modified RMR on Volcanic Rocks in the Vicinity of Ilgwang Fault
Chang, Tae-Woo ; Lee, Hyeon-Woo ; Chae, Byung-Gon ; Seo, Yong-Seok ; Cho, Yong-Chan ;
The Journal of Engineering Geology, volume 17, issue 3, 2007, Pages 483~494
The properties of fracture system on road-cut slopes along the Busan-Ulsan express way under construction are investigated and analyzed. Fracture spacing distributions show log-normal form with extension fractures and negative exponential form with shear fractures. Straight line segments in log-log plots of cumulative fracture length indicate a power-law scaling with exponents of -1.13 in site 1, -1.01 in site 2 and -1.52 in site 3. It is likely that the stability and strength of rock mass are the lowest in site 1 as judged from the analyses of spacing, density and inter-section of fractures in three sites. In contrast, the highest efficiency of the fracture network for conducting fluid flow is seen in site 3 where the largest cluster occupies 73% through the window map. Based on the field survey data, this study modified weighting values of the RMR system using a multiple regression analysis method. The analysis result suggests a modified weighting values of the RMR parameters as follows; 18 for the intact strength of rock; 61 for RQD; 2 for spacing of discontinuities; 2 for the condition of discontinuities; and 17 for ground water.