Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Geosynthetic Society
Journal Basic Information
Journal DOI :
Korean GeoSynthetics Society
Editor in Chief :
Volume & Issues
Volume 14, Issue 4 - Dec 2015
Volume 14, Issue 3 - Sep 2015
Volume 14, Issue 2 - Jun 2015
Volume 14, Issue 1 - Mar 2015
Selecting the target year
Numerical Analysis in Hydrograph Determination for Sluice Gate installed Levee
Kim, Jin-Man ; Choi, Bong-Hyuck ; Oh, Eun-Ho ; Cho, Won-Beom ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 1~9
DOI : 10.12814/jkgss.2015.14.4.001
According to national regulations and its commentary, such as Rivers Design Criteria & Commentary (KWRA, 2009), Foundation Structure Guideline and its Commentary(MLTM, 2014 and KGS, 2009), the integrity evaluation of river levee includes slope stability evaluation of both riverside/protected low-land and piping stability evaluation with respect to foundation and levee body along with water level conditions. In this case the design hydro-graph can be the most important input factor for the integrity evaluation, however it is fact that the national regulations do not provide any proper determination methods regarding hydro-graph. The authors thus executed an integrity evaluation of sluice gate in levee by changing each hydro-graph factor, including rising ordinary water level, lasting flood water level, falling water level, and flood frequency, in order to suggest a determination method of reasonable hydro-graph. As a result, the authors suggested that at least over 57 hours of rising ordinary water level and over 53 hours of lasting flood water level should be considered for the design hydro-graph of sluice gate in levee at Mun-san-jae.
Experimental study on usability of soil pavement using weathered granite soil and organic solidification agent
Hwang, Sung-Pil ; Jeoung, Jae-Hyeung ; Lee, Yong-Soo ; Lee, Tae-Hyung ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 11~21
DOI : 10.12814/jkgss.2015.14.4.011
The method to replace asphalt and cement is needed to reduce the carbon emission on road. Polymeric material which is light and easy to handle while having complex function with less carbon emission would be highly effective when it replaced soil pavement containing cement. This study is intended to identify the usability of soil pavement containing organic solidification agent only through the field test. Pavement on bike trail still satisfied required bearing capacity coefficient in 3 months. Pavement after passing 1.6 bil units of bike through pavement acceleration test that simulated a long-term serviceability during a short-time still remained unaffected, demonstrating a long-term serviceability of soil pavement.
Parametric Study on Displacement of Earth Retaining Wall by the Bermed Excavation Using Back Analysis
Lee, Myoung-Han ; Kim, Tae-Hyung ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 23~33
DOI : 10.12814/jkgss.2015.14.4.023
Together with the wall stiffness, a berm has the role of deciding the stability of a temporary retaining wall before structure installation after excavation. Especially in case of loose or soft soil excavated ground, the role of berm is very important. In this study, the measurement data obtained from the temporary retaining wall in the bermed excavation site in urban and numerical analysis are used to investigate the effects of berm's dimension (width and slope), excavation depth and ground property on the maximum horizontal displacement of the temporary retaining wall. The measurement data indicated that the wall displacement varied to the berm's width. That is, as the berm width decreased, the wall displacement increased. As a result of numerical analyses, the maximum wall displacement increased as slope increased and berm width decreased. This means that the berm is effectively restrained to the wall displacement. As excavation depth increased, the effect of berm's slope and width increased. In case of the same berm condition, the wall displacement restrained as ground property increased.
Observed Long-term Water Content Change in Concrete Track Roadbed by Rainfall
Choi, Chanyong ; Kim, Hunki ; Yang, Sangbeom ; Eum, KiYoung ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 35~43
DOI : 10.12814/jkgss.2015.14.4.035
In this study, it was performed in characteristics of settlement of roadbed materials with variation of water content using cylinder model device. The ratio of settlement (
) of subgrade soils in the initial water content were about 2.08, whereas it was increased about 4.06 which resulted in increase two times in the initial water content. Also, it was monitoring long-term to measure variation of the field water contents at concrete track using rainfall measuring sensors. The water content at directly underneath of concrete track rarely seems to affect the variation of water content, but it was increased by about 4% than intial water content with 20 mm/hr rainfall index at slope section. As for the result from the field date, it was determined that the water content of the inner subgrade layer was rarely affect caused by more than 20 mm/h rainfall index during if good drainage system at concrete track properly maintained.
Analysis of Correlation among Various Compaction Evaluation Methods for Estimating of the Bearing Capacity on Subgrades
Lee, Joonyong ; Jeoung, Jae-Hyeung ; Choi, Changho ; Kim, Jin-Young ; Jin, Hyunwoo ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 45~58
DOI : 10.12814/jkgss.2015.14.4.045
Even though the plate bearing test (PBT) to evaluate the load baring capacity and the field density test to evaluate the relative density are mainly used for quality control of soil compaction in Korea, use of the dynamic cone penetrometer test (DCPT) and the dynamic plate bearing test (DPBT) considering economic feasibility, rapidity, and suitability for field conditions increase to use for quality control of soil compaction. In this study, bearing capacity and relative density of subgrade with thickness of 20 cm, 30 cm, and 40 cm are estimated using PBT, DCPT, DPBT and field density test in three field compaction tests, and the relationship among various compaction evaluation methods is analyzed and discussed.
A Study on Characteristics of Self-weight Consolidation of Bottom Ash Mixed Soil
Yoon, Won-Sub ; Shin, Seung-Gu ; Chae, Young-Su ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 59~77
DOI : 10.12814/jkgss.2015.14.4.059
In order to meet the new requirements for landfill materials, this study planned a study to apply mixed soil of mixing bottom ash and coastal dredged soil to the dredged ground. Coal ash generated from thermal power plant is divided into fly ash and bottom ash. In the case of fly ash, many studies have been conducted because small particles causes permeability coefficient to be small during recycling so no problem has been raised in the environmental area but the utilization of bottom ash has been limited because environmental problems have been raised during recycling due to its larger particle size and greater permeability coefficient. According to recently published studies, however, the results of the study that conducted the water analysis of leachate generated in the ground improvement section using bottom ash showed that heavy metal contamination levels were found to be within the reference value and no significant environmental problems were found so utilization of bottom ash is evaluated to increase significantly in the future. This bottom ash has the particle size of sand and only transportation costs need to be considered when providing materials because the majority has been disposed and it is judged as the most suitable material in dredging landfill in the economic aspect because most thermal power plants are located in the coast and transportation costs can be reduced by ship. Also, research on mixed soil that can maximize the effect of the construction period and construction cost savings than dredged soil is determined as needed because the demand for coastal dredging reclamation is increasing such as Saemangeum project etc. Therefore, we studied self-weight consolidation characteristics depending on sample processing and mixing method of mixed soil by carrying out interior self-weight consolidation experiments on mixed soil of mixing bottom ash and Kaolinite according to the new development needs of recent coastal reclaimed ground and these result findings are expected to be used as basic data when applying the large coastal dredged ground in the future.
The Assessment of pH Variation for Neutralized Acidic Areas using Lysimeters by Seasons
Oh, Seungjin ; Oh, Minah ; Park, Chan-O ; Jung, Munho ; Lee, Jai-Young ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 79~86
DOI : 10.12814/jkgss.2015.14.4.079
Korean territories has formed about 70% of mountainous areas that have acidified serious level to average pH 4-5. There are a number of abandoned metal mines about 1,000 in Korea. However, mine tailings and waste rock included heavy metals are exposed to long-term environment without prevention facility or treatment system. Thus, ongoing management and monitoring of soil environment are required. Most of abandoned mine scattered in forest areas of slopes. Soil erosion due to continuous rainfall in the slopy areas can cause the secondary pollution by the influence eutrophication of water system and the productivity loss of the plant. Therefore, this study would like to estimate pH leaching rate by artificial rainfall using waste neutralization-agent in lysimeter. Moreover, the potentially of secondary pollution related to precipitation is figured out through the experiments, and the optimal planting methods would examinate after neutralizing treatment in soil. Experiments composed three kinds of lysimeter; lysimeter 1 had filled only acidic soil, lysimeter 2 had neutralized soil, and lysimeter 3 had planting plants after neutralized soil. In the results, lysimeter 2 showed the lowest pH leaching, and there is not specific relativity with pH leaching of the seasonal characteristics.
Evaluation of Reliability of Strain Gauge Measurements for Geosynthetics
Cho, Sam-Deok ; Lee, Kwang-Wu ; Li, Zhuang ; Kim, Uk-Gie ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 87~96
DOI : 10.12814/jkgss.2015.14.4.087
Geosynthetics are widely used in different ways such as reinforcement of structures in road, railway, harbor and dam engineering, drainage, separation and erosion prevention. They are especially applied to reinforced retaining wall and slope or ground reinforcement. Recently, geosynthetics reinforced pile supported (GRPS) embankment was developed to improve stability and construability of embankments in railway engineering. Extension strains are usually measured by strain gauges adhered to geosynthetics to evaluate the stability of geosynthetics. However, the measurements are influenced by manufacturing method and stiffness of geosynthetics and also adherence of strain gauge. In this study, wide-width tensile strength tests were performed on three types of geosynthetics including geogrid, woven geotextile and non-woven geotextile. During the test, strains of geosynthetics were measured by both video extensometer and strain gauges adhered to the geosynthetics and the measured results were compared. Results show that the measured results by strain gauges have high reliability in case of large stiffness geosythetics like geogrid and woven geotextile, whereas they have very low reliability for small stiffness geosythetics like non-woven geotextile.
Mechanical Characteristics of Dredged and Reclaimed Ground with Low Plasticity from Western Coastal Site
Jeong, Sang Guk ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 97~104
DOI : 10.12814/jkgss.2015.14.4.097
When carrying out design for soft ground improvement before reclamation of dredged soil, it is very important to appropriately evaluate design parameters such as compression index and undrained strength in order to estimate optimum construction cost. In this study, consolidation and strength parameters were estimated by the samples obtained from the similar reclaimed land. Water content and compression index of dredged soil reclaimed by hydraulic fill method were quite decreased in comparison with those of in-situ conditions at Incheon site. Relationships between compression index(Cc) and water content (wn), and between undrained strength (su) and water content (wn) for dredged soil were obtained by field vane test and oedometer test, respectively. Applicability of Schmertmann correction method (compression index) for low plasticity silty soil was discussed according to comparison with designed and measured settlements.
Chloride Penetration Resistance and Flexural Behavior of Hybrid Organic Fibers Reinforced Concrete
Kim, Seung Hyun ; Kang, Min Bum ; Lee, Dong Wook ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 105~115
DOI : 10.12814/jkgss.2015.14.4.105
In this study, to understand mechanical characteristic of hybrid reinforced concrete by PVA-fiber 6 mm and PP-fiber 50 mm, which are organic fiber replaced macro-fiber with PP-fiber, four mixed Hybrid Organic Fibers Reinforced Concrete (HFRC) is compared with one mixed plain concrete without fiber reinforcement. Volume portion of the fibers are limited under one percent. The result presents that hybrid reinforcement of the organic fibers cannot maximize stiffness and ductility behavior of the steel fiber reinforcement. however, in comparison to plain concrete, it is confirmed that meaningful relation between toughness index and equivalent flexural strength with advanced ductility behavior. Also, in the case of concrete hybrid reinforced by organic fiber, when the volume portion of the fiber increases, ductility also increases. PP-fiber, which is macro fiber, has more effect on the flexural behavior of concrete than PVA-fiber, which is micro fiber, does. The result also shows that it decrease chloride penetration in chloride penetration test.
Behaviour of geogrid reinforced model retaining wall in active failure state by execution of parallel movement
Lee, Kang-Man ; Kong, Suk-Min ; Lee, Dae-Young ; Lee, Yong-Joo ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 117~127
DOI : 10.12814/jkgss.2015.14.4.117
Recently, there has been a string of negligent accidents for the retaining wall and slope. In order to measure the ground deformation for the MSE wall, the authors carried out the model test to assess behavioral characteristics of geogrid MSE walls in active failure state with different conditions of geogrid reinforcement. The models are built in the soil container box having dimension, 100 cm long, 90 cm height, and 10 cm wide. The reinforcement used in the model test is geogrid (polyvinyl chloride, PVC). Three geogrids are sized by
length) respectively. In this study, the laboratory model tests represented for several conditions of the MSE wall, and then its results were compared to 2D FE analysis.
A Study on p-y Curves with Pressuremeter Tests in Jeju Basalt Rock
Yang, Ki-Ho ; Huh, Jong-Chul ; Park, Jeong-Jun ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 129~137
DOI : 10.12814/jkgss.2015.14.4.129
Recently, offshore wind farms are increasingly expected, because there are huge resource and large site in offshore. Jeju island has optimum condition for constructing a wind energy farm. Unlike the mainland, Jeju island has stratified structure distribution between rock layers sediments due to volcanic activation. In these case, it can be occur engineering problems in whole structures as well as the safety of foundation as the thickness and distribution of sediment under top rock layer can not support sufficiently the structure. One of the most obvious applications of the pressuremeter test is the solution of the problem of laterally loaded piles. A hyperbolic non-linear p-y criterion for rock is developed in this study that can be used in LPILE program, to predict the deflection, moment, and shear reponses of a shaft under the applied lateral loads. Finally, a comparison between the predicted and measured response at two different sites is shown to give an idea of the accuracy of the IFP method.
Effect of Nano-Bubble on Removal of Complex Heavy Metals
Lee, Yang-Gyu ; Han, Jung-Geun ; Choi, Ju-Hyun ; Kim, Dong-Chan ; You, Seung-Kyong ; Hong, Kikwon ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 139~146
DOI : 10.12814/jkgss.2015.14.4.139
This paper describes a effect of nano-bubble on removal of complex heavy metals, in order to remove pollutants of soil with copper (Cu) and lead (Pb) based on column test. It was conducted column test considering inflow and fine soil contents condition, and then it was analyzed removal effect of nano-bubble on Cu and Cu/Pb. The test result showed that the removal effect of the nano-bubble was higher than that of distilled water regardless of fine soil contents in case of Cu pollutant, and the removal effect of nano-bubble on heavy metals was found to have a significant impact on Pb than Cu in case of Cu/Pb pollutants. It was also analyzed that engineering properties (like a flow path and permeability) of soil due to void ratio has influenced a significant impact the pollutants removal of nano-bubble. The test results determined that nano-bubble can be applied as a flushing agent for priority target pollutant in complex heavy metals.
Development and Application of Backfill Material for Reducing Ground Subsidence
Lee, Dae-Young ; Kim, Dong-Min ; Ryu, Yong-Sun ; Han, Jin-Gyu ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 147~158
DOI : 10.12814/jkgss.2015.14.4.147
In this study, sewer backfill material was developed to prevent sewer damage and ground subsidence. Laboratory test was performed in the field of CA replacement ratio, accelerator type and replacement ratio and W/M. The compression strength of backfill material was 0.55~0.64MPa below in W/M 70% and 0.20MPa over W/B 80%. Ice block was used to simulate the ground cavity and subsidence caused by sewer damage in application study. The existing sand compaction and the new backfill material was comparative estimated in field. The ground settlement of cross section was 23.4cm and that of longitudinal section was 27cm in sand compaction section, but the ground had not sunk in backfill material section.
Permeability Characteristics of Cement Mixtures with Powdered Sludge of Basalt in Jeju Island
Lee, Yang-Gyu ; Yun, Jung-Mann ; Song, Young-Suk ; Kim, Ki-Young ; Hong, Kikwon ;
Journal of the Korean Geosynthetic Society, volume 14, issue 4, 2015, Pages 159~165
DOI : 10.12814/jkgss.2015.14.4.159
In this study, the coefficient of permeability for cement mixtures including the powdered sludge of basalt, sand or fly ash with different mixed ratios was measured in order to reuse the powdered sludge of basalt in Jeju Island as the cut off materials. As the permeability test results, the coefficient of permeability for the cement mixtures with fly ash was increased with increasing the fly ash contents. The amount of fly ash in the cement mixtures should be mixed with less than 8 %. Meanwhile, the coefficient of permeability for the cement mixtures with sand was increased with increasing the sand contents. The amount of sand in the cement mixtures should be mixed with less than 40 %. According to the comparison result of cement mixtures including fly ash or sand, it is more advantageous to put the sand into the cement mixtures, rather than mixing the fly ash.