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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geoenvironmental Society
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Journal DOI :
Korean Geo-Environmental Society
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Volume & Issues
Volume 10, Issue 7 - Dec 2009
Volume 10, Issue 6 - Oct 2009
Volume 10, Issue 5 - Aug 2009
Volume 10, Issue 4 - Jun 2009
Volume 10, Issue 3 - Apr 2009
Volume 10, Issue 2 - Feb 2009
Volume 10, Issue 1 - Jan 2009
Selecting the target year
Correlations Between the Physical Properties and Compression Index of KwangYang Clay
Bae, Woo-Seok ; Kim, Jong-Woo ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 7~14
The correlation equation empirically proposed to obtain compression indexes has been proposed to conveniently obtain the value using the soil parameter that can be obtained through simple tests when the number of time of consolidation testing is low or the distribution is large but most of the analyzed regions are limited to certain regions abroad or in the country and multiple data were integrated for use in many cases, thus it is not very reasonable to apply it. Therefore, to establish a new design method considering the uncertainty of the ground, it was selected the Kwangyang port area of which the data have been collected recently thus are relatively more reliable as the subject region of the study in order to maximally reduce the uncertainty of test data. After performing the verification of the normality of the consolidation test data obtained from the selected region and the transformation of variables, a prediction formula was proposed through the regression model with the transformed variables and the proposed regression model with transformed variables was compared with existing empirical equations to verify the suitability of the proposed model formula. After analyzing, it was confirmed that the coefficient of determination was increased after the Box-Cox variable transformation, thus the explanatory power was being enhanced and through the root-mean-square-error method, it was confirmed that the proposed model formula showed the most closed value to the test value.
Tunnel Behavior According to the Pillar Width
Kim, Young-Su ; Kwon, Tae-Soon ; Jeong, Il-Han ; Kim, Kwang-Il ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 15~23
This research area is a greate section of triple tunnels that passes through the fault fractured zone the in the granite area. In this area, tunnel section, pillar width and overburden height are changed consecutively due to declivity of 1 : 4.5 and slope formation of upper part as changed section. That is, stability estimation for each section varying pillar width can be conducted because tunnel diameter changes gradually from 0.5D to 1.0D according to distance of pillar width. We have estimated the stability of pillar width in triple tunnels with monitoring value, and compared the stability with results of numerical analysis.
Evaluation of Removal Properties of Cu(II) from Aqueous Solutions by Inflated Vermiculites
Song, Jae-Hong ; Lee, Jun-Ki ; Kim, Seog-Ku ; Lee, Tae-Yoon ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 25~32
The main objective of this study was to examine the removal properties of Cu from water by inflated vermiculites. The component of vermiculites was analyzed by XRF and the concentration of Copper ion was measured by UV-VIS. Serial batch Kinetic tests and batch sorption tests were conducted to determine the removal characteristics for Cu in aqueous solutions. The result shows that removal rate,
, of Cu are 0.73, 1.52, and 1.71 for initial pH 3, pH 4, pH 5, respectively, and are 3.19, 1.90, and 0.73 for the initial concentration of 1mg
, respectively. It leads to the conclusion that the removal rates are inversely proportional to the initial Cu concentration and are increased proportionally to the initial pHs. Finally, Sorption data were correlated with both Langmuir and Freundlich isotherms. As a result, Langmuir and Freundlich models were well fitted to batch isotherm data with good values of the determination coefficient. but the determination coefficient value for the Freundlich model fit was slightly higher than that of Langmuir model (0.965 for the Freundlich model and 0.936 for the Langmuir model). Using the Langmuir model, the maximum sorption capacity (
), Freundlich partition coefficient, and the numerical value of n wrer estimated as 1,250mg
, 635.1 L
and 1.69, respectively. These results show that the inflated vermiculites could be used as an excellent adsorbent for copper contained in various types of aqueous solutions.
Behavior of Flexible Pipes with the Accelerated Flowable Backfill Materials Using Surplus Soil for Underground Power Utilities
Oh, Gi-Dae ; Kim, Dae-Hong ; Lee, Dae-Su ; Kim, Kyoung-Yul ; Hong, Sung-Yun ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 33~41
In the case of underground power utilities pipe such as circular pipe, the most difficult problem is low compaction efficiency of the bottom of pipe inducing the failure of utilities. To overcome this problem, various studies have been performed and one of these is CLSM (controlled low strength materials) accelerated flow ability. CLSM has already been stage of commercial use in the foreign countries led by power company. In this study, we estimated the behavior of flexible pipe with flowable backfill materials and sand to compare on the DB24 load. The results showed that the deformation of flexible pipe is affected by types of backfill materials. CLSM shows better behavior characteristics than compacting sand. But numerical and analytical results that peformed to compare to the field test results showed big gap with the field results.
A Study on the Lateral Deformation of Retaining Walls during Excavation with Degree of Consolidation
Byun, Yoseph ; Choi, Dong-Chan ; Shin, Seung-Jin ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 43~51
This paper holds three objects. The first is to analyze surveys of concerning zone and promotion department. The data were collected through an examination of construction excavated in coastal soft (marine) clay and measurements obtained during excavating construction. The second is to observe the appropriate selection and the application of support system on earth retaining wall in soft clay. Lateral deformation behavior during the excavating construction according to the differences in a soft ground pressuring degree was investigated. The third is to compare the results with those of numerical analysis. Therefore, the purpose of this study is to analyze the characteristics of lateral deformation when soft ground improvement for the expansion of infrastructure in object of study zone has been incompleted. Also, it is to identify the relationship between the degree of consolidation of soft ground and lateral deformation, in a method of displacement quantity in compliance with the numerical analysis and a quatitative analysis. In conclusion, displacement of excavated section after consolidation was fewer 60% averagely than section under consolidation.
Evaluation of Piezocone Factors for Soft Ground in the Region of Nakdong River Estuary Using Statistical Analysis
Kim, Young-Hun ; Jang, Jung-Ho ; Choi, Dong-Chan ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 53~66
Recently, the importance of investigation for soft ground has been raised, so that various techniques of the investigation for soft ground are being introduced and applied. In particular, Piezocone penetration test has been utilized frequently home and abroad to identify many features of grounds precisely and gain various results in accordance with dividing strata and depth constantly by measuring continuously. In this study, to identify some features of soft clays distributed in the estuary of Nakdong river, researchers conducted field tests and laboratory tests with boring tests, and analyzed and compared with Piezocone penetration test. In addition, credible Piezocone factor of communities of subjects for this study was estimated to analyze some features of undrained shear strength of clay and calculate Piezocone factor compared with corrected cone resistance and apply some statistical techniques to estimated Piezocone factor.
Assessment of The Priority Order of Monitoring Devices on Maintenance for The Long-Term Safety of Existing Fill Dam
Lee, Jong-Wook ; Jeon, Jae-Sung ; Lim, Heui-Dae ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 67~79
Although readjustment of monitoring system for existing fill dam maintenance is needed by the sustainable increasing of the abandonment rate of monitoring devices by malfunction through the life-cycle of dam, monitoring plans for long-term dam safety has relied on the experience and the opinion of minor expert group without systematic and quantitative analysis on the failure modes and the priority order of monitoring devices on maintenance. In this study the priority order of monitoring devices of existing 5 fill dams was evaluated quantitatively based on the preceding study (Andersen et al, 1999) and the result recommended the establishment of real-time monitoring system for seepage, pore pressure and crest settlement as the readjustment plan for existing fill dam monitoring system. This readjustment plan matches well with the recommendation of PWRI (1984), JCOLD (1986) and the results from Bagherzadeh-Khakkahali and Mirghasemi (2005).
A Study on the Stability Estimation Procedure for Reinforced Pillar of Twin Tunnel
Baek, Seung-Cheol ; Jang, Bu-Sik ; Lee, Tae-Gyu ; Lee, Sung-Min ; Hwang, Jung-Soon ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 81~91
Recently, twin-tunnel is often designed in the aspects of disaster prevention and economical reasons. However, the design cases and the studies are relatively insufficient. By the twin-tunnel excavation, deviate stresses of pillar between tunnels are increased and the increased stresses induce the instability of the twin-tunnel. In this study, numerical analyses about the twin-tunnel behaviour were conducted with varying ground strength, width of pillar and depth of earth cover and a series of regression analyses were carried out by using the results of numerical analyses for the twin-tunnel. Based on the numerical analyses, an estimation method of derived stresses is suggested through the regression analyses. Also, based on the results of regression analyses, an quantitative estimation method considering the reinforcement effects is also suggested. Then various parametric studies were conducted to be considered the reinforcement type and various design parameters. Finally, the efficiency of the suggested method based on the Hoek-Brown Failure Criterion is verified through the results of parametric studies.
A Study on the Effects of Heat Pump Using Standing Column Well on Soil and Groundwater Microorganisms
Jun, Jung-Eui ; Park, Si-Sam ; Na, Sang-Min ; Rhee, Keon-Joong ; Park, Jae-Woo ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 93~101
Standing column well (SCW) heat pump system produces geothermal energy by the heat exchange of the groundwater. If SCW system changed the temperature of soil and groundwater, it could also change species or population of microorganisms. Therefore it is needed to research about the effect of temperature change on microorganisms to use eco-friendly geothermal energy. We produced the simulative heat pump system (SHPS) and observed the change of the soil temperature in SHPS. Characteristic analysis of microorganisms isolated from soil was performed and groundwater temperature variation was evaluated. Also the bleeding effect in SHPS was investigated and the results are included. As the results, the population of microorganisms was increased about 90%, as the groundwater temperature increased 2-3 celsius degree. However the species of microorganism was little influenced by the temperature change of the soil.
Development of New Probabilistic Seismic Hazard Analysis and Seismic Coefficients of Korea Part I: Application and Verification of a Novel Probabilistic Seismic Hazard Analysis Procedure
Park, Du-Hee ; Kwak, Dong-Yeop ; Jeong, Chang-Gyun ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 103~109
The probabilistic seismic hazard analysis (PSHA) calculates the probability of exceedance of a certain ground motion parameter within a finite period at a site of interest. PSHA is very robust in that it can account for the uncertainties in seismic source, wave passage effect, and seismic site effects and hence, it is the most widely used method in quantifying the future earthquake induced ground vibration. This paper evaluates the applicability of a new PSHA that is alleged to be able to reproduce the results of a conventional PSHA method, but generates a series of earthquake scenarios and corresponding ground motion time histories that are compatible with the scenarios. In the application, a 40,000 year period is simulated, during which 16,738 virtual earthquakes have occurred. The seismic hazard maps are generated from the outputs of the new PSHA. Comparisons with the maps generated by the conventional PSHA method demonstrated that the new PSHA can successfully reproduce the results of a conventional PSHA. The new PSHA may not be very meaningful in itself. However, the real advantage of the method is that it can be used to develop probabilisitic seismic site coefficients. The suite of generated ground motion time histories are used to develop probabilistic site coefficients in the companion paper.
Development of New Probabilistic Seismic Hazard Analysis and Seismic Coefficients of Korea Part II: Derivation of Probabilistic Site Coefficients
Kwak, Dong-Yeop ; Jeong, Chang-Gyun ; Lee, Hyun-Woo ; Park, Du-Hee ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 111~115
In Korea, the probabilistically developed seismic hazard maps are used with deterministically derived seismic site coefficients in developing the design response spectrum of a specific site. Even though the seismic hazard maps and seismic site coefficients are incompatible, the current design code ignores such incompatibility. If the seismic hazard map and seismic coefficients are both developed in identical probabilistic framework, such problems can be solved. Unfortunately, the available method cannot be use to derive "true" probabilistic site coefficients. This study uses the ground motion time histories, which were developed as the result of a new probabilistic seismic hazard analysis in the companion paper, as input motions in performing one-dimensional equivalent linear site response analyses, from which the uniform hazard response spectra are generated. Another important characteristic of the hazard response spectra are that the uncertainties and randomness of the ground properties are accounted for. The uniform hazard spectra are then used to derive probabilistic site coefficients. Comparison of probabilistic and deterministically site coefficients demonstrate that there is a distinct discrepancy between two coefficients.
Characteristics of Scour around Pipeline in Current
Kim, Sung-Duk ; Ahn, Kwang-Kuk ; Lee, Ho-Jin ; Lee, Seong-Min ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 117~123
This study is to investigate the characteristics of scour around pipeline in current and hydraulic model tests were performed. All the model test are 45 cases, which were conducted with velocities of 0.2 m/s to 0.5 m/s and pipe diameters of 45, 60, 90 mm. The developments of scour around pipeline were observed and equilibrium scour depths were recorded due to variation of pipe diameter and current velocity. According to the results, the equilibrium scour depth was proportional to current velocity and pipe diameter. The effect of diameter of pipeline on the equilibrium scour depth was bigger than current velocity. The correlations of relative scour depth and dimensionless number such as a Reynolds number, Shields number, and Froude number were analyzed. The Froude number and the relative scour depth had a high correlation of 0.900.
Analysis of the Drying Characteristic of Wastewater Sludge by Microwave to Make Energy Resources
Lee, Seong-Min ; Lee, Yoon-Sik ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 125~133
Wastewater sludge had normally filled up in land before revising the law of waste material management in 2003, which does not permit landfill of organic sludge in Korea. After the law, most sludge has been littered in the ocean up to now. However, due to the London Convention 96 Protocol, littering sludge in the ocean will also be prohibited after 2011. This Protocol makes countries find out new methods to treat wastewater sludge. There is no exception in Korea too. Many researchers have urgently try to find out better ways to treat sludge. One of ways is to make sludge recycle energy and the success of it depends on drying method. Specifically, it really depends how to make sludge dry ecologic friendly and economic efficiently. Therefore, wastewater sludge produced in Youngdong was analyzed to make it energy resources in this study. The sludge was tested to analyze the drying and chemical characteristics of it by irradiating microwave. In the result, it is sure that the sludge has little heavy metals as like as others in country side. High calories, 3370 Kcal, shows that it has good potential to be recycle energy. Moreover, weight deduction of the sludge vs. time shows long S-curve and has same deduction ratio. Specifically, S-curve can be divided by three sections based on the curvature points. There are steady state reduction ratio of weight and approximately 80% of weight duction in the second section. This results can be used to estimate the amount of sludge reduction in the full-scale microwave dryer. Drying capacity of microwave shows approximately 1.0 kg/kw/hr. It makes sure that sludge recycle energy has the potential of economic efficiency too.
A Study of the Dynamic Amplification Characteristics of the Domestic Seismic Observation Sites Using Coda Wave
Kim, Jun-Kyoung ; Lee, Jun-Dae ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 135~141
For more reliable estimation of soil-structure interaction and seismic source and attenuation properties, site amplification function should be considered. This study use the Nakamura's method (1989) for estimating site amplification though various methods for the same purpose have been proposed. This method was originally applied to the surface waves of background noise and therefore there are some limitation for applications to general wave energy. However, recently this method has been extended and applied to the S wave energy successfully. This study applied the method to the coda wave energy which is equivalent to the backscattered S wave energy. We used more than 60 observed ground motions from 5 earthquakes which occurred recently, with magnitude range from 3.6 to 5.1 Each station showed characteristic site amplification property in low-, high- and resonance frequency ranges. In the case of comparing these results to those from S wave energy, lots of information to the site classification work can be gained. Moreover, removal of site amplification can give us more reliable seismic source parameters.
Assessment of Consolidation Properties Using Modified Oedometer for Radial Drainage Condition
Jeon, Je-Sung ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 143~150
Material functions about effective stress, permeability, coefficient of consolidation and coefficient of volume change has important role to predict consolidation velocity and settlement of soft ground. Modified oedometer for radial drainage is adapted to find out material functions on laboratory tests. Undisturbed sample for laboratory tests were taken from construction sites of industrial complexes on southern coastal area which consists of upper dredged fill and lower original clay layer. For different drainage condition in consolidation process void ratio, effective stress, permeability, coefficient of consolidation and coefficient of volume change has been assessed with results of existing standard oedometer tests. It is worthwhile to note that consolidation material functions could be expressed as regression equation by Stark (2005), heterogeneity for permeability could be assessed from these relationships.
A Basic Study on Upward Soil Nailing Combined Horizontal Drainage
Kim, Hong-Taek ; Lee, Jung-Jae ; Chung, Jong-Min ; Choi, Geun-Hyeok ; Lee, In ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 151~158
In the early 1990s, soil nailing was first introduced as method of reinforcement for the slope stability and ground excavation, and as its application was increased the improved soil nailing was also developed. Most recently used for grout soil nailing greatly improve the methods and techniques for self-improvement techniques are classified as soil nailing. As the representative for the grout pressure method to improve the join method pressure grouting and improved method for the self-drilled soil nailing, removable soil nailing, upward soil nailing combined with horizontal drainage system. This paper is to compare upward soil nailing combined with horizontal drainage system with downward direction of the soil nailing. In order to study the limit equilibrium slope stability analysis and comparison with factor of safage, excavation for the vertical displacement for comparison with continuous analysis. According to this study, safage factor is decreased considerably using limit equilibrium analysis and makes no odds for the horizontal displacement when soil nail was installed upward.
Application on Pile Under Lateral Load in Multi Layered Ground Using the Strain Wedge Model
Kim, Hong-Taek ; Lee, Jung-Jae ; Chung, Jong-Min ; Yoon, Chang-Jin ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 159~165
The Strain Wedge Model is useful method for horizontal bearing capacity calculation considering interaction of pile and ground deformation. However, application case of the Strain Wedge Model is rare and the strain wedge model of plenty of verification is needed on multi layered ground in Korea. In this present study, to conduct laboratory model test and numerical analysis for verification of Strain Wedge Model, adapt model that could describe the interaction of pile and ground deformation on multi layered ground. In model test, it was performed to estimate the behavior characteristics on pile under lateral load and to analyze the relationship between load and deformation. In addition, it was fulfilled to measure the skin friction on pile using strain gauge and to decide the ground passive resistance wedge using skin friction. Numerical analysis was performed to verify laboratory model test results.
Numerical Study on Failure Mechanism of Tunnel Shotcrete Lining
Shin, Hyu-Soung ; Shin, Dong-In ; Bae, Gyu-Jin ; Kim, Dong-Gyu ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 7, 2009, Pages 167~177
This study investigates a failure mechanism of a tunnel shotcrete lining with respect to a concentrated load due to blocky rock mass. First of all, it is carried out to survey relevant researches to shotcrete failures by literature reviews and to numerically re-investigate the failure modes of shotcrete lining given by previous researches. Through this study, the failure modes are relocated with the conditions which induce each failure mode newly proposed by this study. In addition to this, the arching shape of tunnel lining, which has not been considered in the previous research despite of inherent geometrical characteristics in tunnels, is taken into consideration in numerical investigation on lining failure in this study. As a result, it is shown that more simplified failure modes can be found on the tunnel boundary condition and the corresponding failure condition to each mode can be different from ones of the previous study due to a tunnel arching effect.