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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Geoenvironmental Society
Journal Basic Information
Journal DOI :
Korean Geo-Environmental Society
Editor in Chief :
Volume & Issues
Volume 9, Issue 7 - Dec 2008
Volume 9, Issue 6 - Oct 2008
Volume 9, Issue 5 - Aug 2008
Volume 9, Issue 4 - Jun 2008
Volume 9, Issue 3 - Apr 2008
Volume 9, Issue 2 - Feb 2008
Volume 9, Issue 1 - Jan 2008
Selecting the target year
Evaluation of Numerical Experiment of Pollution Dispersion on the Sewer Crack Occurrence
Park, Jae-Sung ; Bae, Woo-Seok ; Lee, Ho-Jin ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 3, 2008, Pages 5~9
Because sewer is embedded in land, the pollutant permeating to underground so fast can cause contamination of soil when crack of sewer occurs. In th is study, numerical modelling on dispersion of pollutant at sewer crack was performed. Based upon the study, the following conclusions were obtained. It was shown that transfer direction of pollutant was similar to the flow with topography slope of surface. It was exposed that the pollutant permeated to 8~10m depth. It is expected to offer efficiency in sewer management in the future through this research.
The Determination of Optimal Steel Pipe Wall Thickness Considering Ground Condition
Park, Jae-Sung ; Oh, Bung-Dong ; Lee, Ho-Jin ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 3, 2008, Pages 11~15
By considering manufacture and economic factor, the steel pipes have been employed for water supply pipeline with large diameter. The standard to decide a thickness of pipe was provided by the waterworks standard (Ministry of Construction & Transportation, 1992) in South Korea. However, there was no the systematic standard to confirm a thickness of pipe in it. Thus, it should be able to apply to unsuitable the Stewart formula for the buried pipe to design for an optimum thickness of pipe. In order to meet revised the waterworks standard (The Ministry of Environment, 1997), it has been considered both the ground condition and all of the stresses to compute a thickness of pipe. As a results, a method is suggested to determine thickness of pipe after comparing and validating the obtained results with the established results from the Stewart formula.
Development of Residual Tensile Strength Prediction Model for Metallic Water Pipes
Bae, Chul-Ho ; Kim, Jeong-Hyun ; Woo, Hyung-Min ; Hong, Seong-Ho ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 3, 2008, Pages 17~28
In this study, the residual strength prediction models were proposed by measuring various residual strength according to pit characteristics for metallic water pipes such as cast iron pipe (OP), ductile iron pipe (DIP), and steel pipe (SP). The exponential prediction model was better fitted to measured residual tensile strength for CIP. In case of DIP and SP, the prediction model using loss of strength was more exactly predicted compared with other model types. The fracture toughness were averagely
for DIP, and
for SP, the determination coefficient (
) of between measured residual tensile strength and predicted values for residual strength prediction models using fracture toughness was estimated from 0.44 to 0.86. Especially, the proposed residual tensile strength prediction models were applied for the verification and reliability to CIPs and DIPs at 14 sites. The determination coefficient (
) between measured residual tensile strength and predicted values was estimated from 0.76 to 0.78. Therefore it was thought that the proposed residual tensile strength models could help to support resonable and economical decision of rehabilitation/replacement.
Analysis of Soil Samples Obtained from Piston Sampler and Large Diameter Sampler
Kim, Young-Chin ; Kang, Jae-Mo ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 3, 2008, Pages 29~34
A large diameter sampler was developed to take undisturbed samples from not only soft ground but also sandy and weathered ground. The large diameter sampler which was developed in Korea Institute of Construction Technology(KICT-type large diameter sampler) was manufactured based on the principle of triple core barrel sampling. A specially designed cutting device was used to cut and contain various kinds of samples in the sampler during a sampling and retrieval procedure. By adjusting the stiffness of the sp ring located at the top of the sampler, the distance between the cutting shoe and auger can be controlled in accordance with the ground condition. In order to investigate the applicability of the developed sampler and compare the quality of the samples taken by the sampler wi th that by the traditional thin-walled tube sampler, samples were taken at various sites according to the ground condition. And a series of laboratory tests such as the unconfined compress ion test, triaxial compression test, oedometer test, large diameter Rowe cell consolidation test (D: 150 mm) were performed. The test results showed that the samples by the KICT-type large diameter sampler show higher quality than the samples by the thin-walled tube sampler. And the validity and applicability of the developed KICT-type large diameter sampler was confirmed accordingly.
The Study of Modified Sequencing Batch Reactor Process for Small Advanced Wastewater Treatment
Han, Woon-Woo ; Kim, Kyu-Hyoung ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 3, 2008, Pages 35~43
This study was carried out to estimate the performance of modified sequencing batch reactor (SBR) process by the application of SBR process for small advanced wastewater treatment plant. Organic, nitrogen and phosphorus were able to remove in the unit reactor by SBR process and it would be able to select the suitable operation method. The plant was operated to achieve high performance with influent control, optimum anoxic/oxic condition using intermediate aeration method, and solid (sludge) /liquid (effluent) separation by modified decanter. The optimum operating mode was 3Cycles a day and intermediate input and aeration. Under these conditions, the treatment efficiencies were good with 60% of designed flow rate and low influent quality. When the influent concentrations of BOD and CODMn were 120.4 mg/L and 95.7 mg/L, respectively. The effluent concentrations of BOD and CODMn were 6.8 mg/L and 11.0 mg/L, respectively. The average removal efficiencies of BOD and CODMn were 94.4% and 88.5%, respectively. The removal efficiencies of T-N and T-P were 69.6% and 73.6%, respectively when the average T-N and T-P concentrations were 32.2mg/L and 4.65mg/L, respectively. The T-N and T-P removal efficiencies were slightly decreased to 58.8% and 68.5%, respectively in the winter season but its were also stable efficiencies. BOD, T-N and T-P were removed by 90%. 67% and 46% respectively in the first anoxic/oxic condition, in addition to T-P was removed by 70% in the second anoxic/oxic condition. From the results, modified sequencing batch reactor (SBR) process is suitable for small advanced wastewater treatment.
Preparation of Activated Carbon Screen Using Stainless Steel Mesh and Cellulose Fiber
Shin, Jin-Hwan ; Kim, Tae-Young ; Jeoung, Young-Do ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 3, 2008, Pages 45~50
In this work, stainless steel mesh-supported activated carbons were prepared using phenolic resin and cellulose fiber.
was used as a activation reagent in this work.
-chemical activation method has been proposed to produce highly porous activated carbons. The objectives of this work were to develop an optimal condition for manufacturing activated carbon assemblies screen from stainless steel mesh and phenolic resin. The iodine number was more increased over activation temperature of
. Iodine number was 657 mg/g at activation temperature of
, penolic resin concentration 20% and
concentration 15%. Iodine number was 1359.4 mg/g when 10% cellulose added to these conditions.
Behavior Analysis of Soil Nailed Wall through Large Scaled Load Test
Kang, In-Kyu ; Kwon, Young-Ho ; Park, Shin-Young ; Lee, Seung-Hyun ; Kim, Hong-Taek ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 3, 2008, Pages 51~60
Soil nailing systems are generally many used to the temporary structure in underground excavations and reinforcements of slopes in Korea. However, large-scaled experimental studies related to soil nailing systems are mostly studies related to performance monitoring and field pullout tests. Specially, there are no researches related in the large scaled load tests of soil nailed walls in Korea. In this study, a case study on the large scaled load tests of soil nailed walls is introduced and the behavior characteristic of them is investigated. Also, they are proposed allowable deformation corresponding to the serviceability limit of soil nailed walls and ultimate deformation corresponding to the collapse state of the walls. These results can be applied to the maintenance management of soil nailed walls. And analysis on the required minimum factor of safety of soil nailed walls using the relation curve of load ratio and deformation ratio are carried out.
Effect of Side Friction on Consolidation Test of Normally Consolidated Kaolinite Slurry
Lee, Jang-Guen ; Fox, Patrick J. ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 3, 2008, Pages 61~68
Side friction is often neglected in the analysis of the results of a consolidation test when the specimen has a high ratio of diameter to height. As the height of a specimen increases, however, side friction becomes important. This paper presents an investigation of the effect of side friction on consolidation test results for normally consolidated kaolinite slurry. Consolidation tests were performed to obtain settlement, pore pressure, compressibility, and hydraulic conductivity of kaolinite slurry. The compressibility relationship is corrected for side friction using a modified form of Taylor (1942) analytical solution. Numerical simulations using the CS2 piecewise-linear model are compared with settlement and excess pore pressure measurements. Experimental results show improved agreement with a modified CS2 model in which the effect of side friction is considered. The numerical and experimental results indicate that the side friction is an important factor affecting the rate of consolidation as well as the compressibility relationship for the specimen.