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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geoenvironmental Society
Journal Basic Information
Journal DOI :
Korean Geo-Environmental Society
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Volume & Issues
Volume 12, Issue 12 - Dec 2011
Volume 12, Issue 11 - Nov 2011
Volume 12, Issue 10 - Oct 2011
Volume 12, Issue 9 - Sep 2011
Volume 12, Issue 8 - Aug 2011
Volume 12, Issue 7 - Jul 2011
Volume 12, Issue 6 - Jun 2011
Volume 12, Issue 5 - May 2011
Volume 12, Issue 4 - Apr 2011
Volume 12, Issue 3 - Mar 2011
Volume 12, Issue 2 - Feb 2011
Volume 12, Issue 1 - Jan 2011
Selecting the target year
Particle Dissolution Effects on Soluble Geo-Mixtures
Tran, M. Khoa ; Cho, Se-Hyun ; Byun, Yong-Hoon ; Shin, Ho-Sung ; Lee, Jong-Sub ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 12, 2011, Pages 5~12
Macro- and micro-behaviors of soluble granular media during dissolution process is investigated by numerical analysis. Soluble media are represented by assemblies of non-soluble particles and soluble particles with the different soluble particles contents. Dissolutions of particles are implemented by reducing sizes of soluble particles. The numerical simulations results exhibit that the vertical displacements increase to certain times and become constant while the porosities still increase until no soluble particles are present. However, the porosities and vertical displacements increase with the increase of soluble particles content. The microscopic views show that the fabrics of media change during dissolution process until the certain times, the higher soluble particles contents, and the larger change in fabric.
A Case Study on Buckling Incidents of Steel Liner under External Water Pressure
Chung, Kyu-Jung ; Chung, Kyung-Mun ; Shin, Hyo-Hee ; Kim, Dae-Ho ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 12, 2011, Pages 13~20
The main objective of this paper is finding the influence factors and their degree of importance to steel liner's safety by investigating and evaluating the buckling incidents of steel tunnel liner under external water pressure. The study was based on the detailed investigation to the design conditions and incident shapes at 2m diameter waterway tunnel with a partially buckled internal steel liner and concrete backfilled lining as the raw water transmission pipe line of regional water supply project. Appropriate buckling theory capable of applying this incident points was selected by referring the existing literature and compared with the results of investigation. Also, hydrogeological characteristics of this site on buckling pressure was evaluated. The result of this study was shown that both the hydrogeological characteristics of upper geologic layers and proper tunnel construction are important factors on buckling at steel liner, and hydraulic gradient level should be decided according to the hydrogeological characteristics. This incident case analysis on steel liner of pressurized waterway tunnel was expected to provide more information for realizing the problems and improvements at each design, construction and maintenance stages.
Geoenvironmental Influence on the Recycled Soil from Demolition Concrete Structures for using in Low Landfilling
Shin, Eun-Chul ; Kang, Jeong-Ku ; Ahn, Min-Hee ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 12, 2011, Pages 21~30
The recycled soil that is proceeded from demolition concrete structures was analyzed by the methods of the physical and mechanical tests of soil and TCLP test to use the soil in low landfilling for the construction of an industrial complex. The laboratory test for diffusion of alkali ion in soil mass was analyzed by the methods of XRF and ICP. The fish toxicity test was also conducted to find an environmental influence. The recycled soil through the laboratory test satisfied the engineering property for low landfilling and the criteria of soil contamination. However, the solution which producted by 1:1 ratio of recycled soil and water contained the high pH concentration by alkali ion. The calcium hydroxide solution by CSH cement paste was estimated as the main reason why pH concentration is increased more than 9.0. The high pH concentration in recycled soils causes a toxicity to the livability of fishes. A diffusion area of pH concentration in the ground was analyzed by the Visual Modflow Ver. 2009 program based on geotechnical investigation. The high pH concentration in the recycled soils can be remained as high value due to cement paste in the long term period. Therefore, in the early stage of landfilling work, the mixing with the weathered granite soil is necessary to control the pH concentration.
Study for Cultivation of Chlorella sp. FC-21 under Different Colors of Light Emitting Diodes (LEDs)
Lee, Tae-Yoon ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 12, 2011, Pages 31~35
The purpose of this study was to determine optimum condition for the cultivation of Chlorella sp. FC-21, which is a freshwater microalgae, using light emitting diodes (LEDs). Specific growth rate and cell concentration were measured for the reactors at the illumination of different wavelengths of LEDs. Among various types of LEDs, red LEDs were the most effective light source, and also greatest increases of specific growth rate and cell concentrations were obtained when light intensity of red LEDs increased. From this study, we found that red LEDs were the most appropriate light source for the cultivation of Chlorella sp. FC-21.
An Analysis of the Composite Discharge Capacity Effect with GCP Method
Park, Min-Chul ; Kwon, Hyuk-Chan ; Shin, Hyo-Hee ; Jang, Gi-Soo ; Lee, Song ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 12, 2011, Pages 37~46
An application frequency of vertical drainage method is increasing as an effective consolidation acceleration method. PBD method is most frequently used as a consolidation acceleration method in vertical drainage methods. PBD is economical and easy to operate but has some problems those are an environmental pollution and a decrease of a discharge capacity caused by bending of drainage materials when it is used in great depth. SCP method was frequently used because it's discharge capacity was good but now it is rarely used because of an increase of the material price because of an order imbalance. As the way to solve these problems, GCP method has been to the fore. For analyzing the effect of GCP method on the discharge capacity, three types of composite discharge capacity tests are done by using GCP, SCP and PBD respectively with the circle case,
. On the contrary to this, GCP shows the worst discharge capacity for a decrease of the void ratio and the clogging phenomenon caused by increasing load. Also to figure out the clogging range of GCP, the clogging of GCP is checked in each load stage with a large case(
) which has clear acrylic front face. The diameter of GCP was 35cm and a clogging phenomenon occurred in 10% approximately. The result shows that the discharge capacity of GCP was given the lowest value for a decrease of the void ratio and the clogging phenomenon causing by increasing load. And the clogging phenomenon mostly occurred within 10% of GCP's diameter range.
Evaluation of Permeability Characteristics of Yangsan Clay using Piezocone Penetration Tests and Laboratory Tests
Gu, Nam-Sil ; Kim, Young-Min ; Park, Jae-Hwhan ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 12, 2011, Pages 47~54
Consolidation behavior of soft clay is generally to be affected by its compressibility and deformation characteristics. Especially, soil permeability depends on soil characteristics including its type of anisotropy. Coefficient of permeability of soft clay is mostly estimated by using laboratory(Oedometer test) and in-stiu piezocone test. The permeability characteristics of soft clay is estimated by excess pore pressure dissipation test results. In this study, the tests were performed to find out the validity of the existing theoretical formula in clay by pore pressure dissipation test and laboratory test results. After grasping of variation the coefficient of permeability ratio(
) in different clay soils, it was found out adequate solution of in-stiu permeability ratio(
). Piezocone tests and laboratory tests were performed at the site of pilot project of ground improvement at Yangsan-Mulgeum, Gyeongsangnam-do. Comparisons of the estimated values of
using piezocone tests results and those from laboratory consolidation tests were carried out. Test results show that values of
by piezocone test result(5.85) is similar of it's laboratory test(5.28).
A Study on Bearing Capacity of Cast-In-Place Pre-Founded Columns in Top Down Construction Sites
Byun, Yoseph ; Jung, Kyoung-Sik ; Kim, Jong-Ho ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 12, 2011, Pages 55~61
Recently, a concept of the downtown area was progressively extended by improvement of rapid transportation system and development of the most advanced telecommunication industries. And underground has become bigger in addition deeper, Excavation methods which construct a structure were changed according to construction environments. Top Down methods which are continuous with architectural plan differ from existing excavation methods innovatively, pre-founded column is an important factor for construction methods, duration, expenses. Therefore, this study considers application by investigative methods according to comparison, analysis on loading test result of on site inspection and estimated results of bearing capacity for structure pre-founded column. As a result, almost designing eclipse appeared prior value which didn't arrive result of load test. Also, evaluate permanent load for the compressive stress acting on head of cast-in-place after basic structure was installed. Then, applying stress generally is reduced by confining effect with foundation.
A Feasibility Study on Resilient Modulus of Expanded Polystyrene (EPS) Geofoam as a Flexible Pavement Subgrade Material
Park, Ki-Chul ; Chang, Yong-Chai ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 12, 2011, Pages 63~70
Expanded Polystyrene (EPS) is a type of geosynthetic material manufactured with various strengths, unit weights, and dimensions. Due to recent advances in research on EPS, the use of EPS has increased dramatically. This super light weight material has a unit weight of approximately 0.16~0.47kN/
, equivalent to 6.3~15.7 of that of most natural soils with conditions of fill materials. In spite of this advantage, it is noted that no standard method of resilient modulus test on EPS geofoam was reported and no literature on resilient modulus test methods for EPS geofoam exist. The main object of this study was to investigate feasibility of the resilient modulus of EPS when it was applied for flexible pavement. The investigation of the feasibility was completed based on the results from triaxial tests.
Evaluation of Engineering Characteristics and Utilization of Nonmetal Mining Waste Powder as Geo-Materials
Cho, Jin-Woo ; Lee, Yong-Soo ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 12, 2011, Pages 71~78
This paper aims to present the evaluation of engineering characteristics and reusing possibility of waste powders produced in dolomite and limestone nonmetal mining by physical and mechanical experiments on compaction, uniaxial compressive strength, permeability, chemical composition, and so on. Granite soil, 2 types of limestone waste powder, and 1 type of dolomite waste powder were used for main materials, and cement and bentonite were used for admixed materials in this experiments. The findings based on the experimental results are the severe difference of chemical composition of the dolomite & limestone waste powder and the crushed rock waste powder, and the outstanding of engineering characteristics of the dolomite waste powder with high content of MgO compared with the limestone waste powder. The engineering properties on compaction, uniaxial compressive strength, and permeability are enhanced with increase of admixed ratio of waste powder on granite soil. From the experimental results, it can be suggested that the dolomite waste powder admixed with in-situ granite soil is useful as geo-materials with considering of distribution costs.
A Study on the Effect of Pile Surface Roughness on Adfreeze Bond Strength
Choi, Chang-Ho ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 12, 2011, Pages 79~88
Adfreeze bond strength develops upon freezing of pore water within soil and at foundation surface. It has been reported that various factors like temperature, soil type, and pile surface roughness affect adfreeze bond strength. Especially, pile surface roughness has been considered as a primary factor to design pile foundation in frozen ground. It has usually been estimated with fixed correction factors for pile materials. However, even if the pile foundation material is the same, the surface roughness could vary depending on the production circumstances. In this study, laboratory test was carried out to quantitatively analyze the effects of surface roughness on the adfreeze bond strength, and fractal dimension was used as a measure for surface roughness. Test results showed that adfreeze bond strength increased with decreasing temperature, increasing vertical stress and surface roughness. The adfreeze bond strength varies sensitively with surface roughness in the early freezing section of -2
, but its sensitivity decreased in the temperature ranging between -2
. The results conclude that the roughness highly affects the frictional resistance of pile surface in frozen ground; however, the roughness does not affect considerably when the temperature drops below about -2