Pub Date : 2019-09-01DOI: 10.12814/JKGSS.2019.18.3.033
Kicheol Lee, H. Shin, Hyuk-sang Jung, Donghoon Kim, Yongsun Ryu, Dongwook Kim
Clinker layer is a stratum structure distributed in volcanic area such as Jeju Island. The clinker layers were formed in between the repetitive action of eruption and solidification of lava flows. Since the clinker layer contains a large amount of voids accompanied by the lava gas ejection process, there is a possibility of inducing overall stability of the ground due to the low stiffness and strength of the clinker layer. Therefore, in this study, site investigation was carried out at both ends of the 00 bridge where the clinker layers exist. And, based on the ground survey results, the behavior of shallow foundations was analyzed numerically. In addition, the improved shallow foundation behavior in grouting substitution using the chemical injection method of the clinker layer was compared with the shallow foundation behavior in the ground, and the grouting substitution efficiency of each layer was analyzed. As a result, the bearing capacity, the replacement efficiency and elastic settlement were different according to the presence or absence of the sediment layer. This is because the sediment layer has a lower stiffness and density than the clinker layer.
{"title":"Evaluation of Shallow Foundation Behavior on Basalt Rock Layers With Clinker and Sediment Layers Reinforced Using Cement Grouting","authors":"Kicheol Lee, H. Shin, Hyuk-sang Jung, Donghoon Kim, Yongsun Ryu, Dongwook Kim","doi":"10.12814/JKGSS.2019.18.3.033","DOIUrl":"https://doi.org/10.12814/JKGSS.2019.18.3.033","url":null,"abstract":"Clinker layer is a stratum structure distributed in volcanic area such as Jeju Island. The clinker layers were formed in between the repetitive action of eruption and solidification of lava flows. Since the clinker layer contains a large amount of voids accompanied by the lava gas ejection process, there is a possibility of inducing overall stability of the ground due to the low stiffness and strength of the clinker layer. Therefore, in this study, site investigation was carried out at both ends of the 00 bridge where the clinker layers exist. And, based on the ground survey results, the behavior of shallow foundations was analyzed numerically. In addition, the improved shallow foundation behavior in grouting substitution using the chemical injection method of the clinker layer was compared with the shallow foundation behavior in the ground, and the grouting substitution efficiency of each layer was analyzed. As a result, the bearing capacity, the replacement efficiency and elastic settlement were different according to the presence or absence of the sediment layer. This is because the sediment layer has a lower stiffness and density than the clinker layer.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":"18 1","pages":"33-44"},"PeriodicalIF":0.5,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85089566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.12814/JKGSS.2019.18.3.045
Jung-Mann Yun, G. Yea, H. Kim, Yongkyu Choi
{"title":"Case Study on Design Efficiency and Bearing Capacity Characteristics of Bored PHC Piles","authors":"Jung-Mann Yun, G. Yea, H. Kim, Yongkyu Choi","doi":"10.12814/JKGSS.2019.18.3.045","DOIUrl":"https://doi.org/10.12814/JKGSS.2019.18.3.045","url":null,"abstract":"","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":"53 1","pages":"45-53"},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79212071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.12814/JKGSS.2019.18.1.079
Chul-Hee Lee, Arum Lee, E. Shin, B. Ryu
The field measurement and laboratory experiment were conducted to investigate the effect of reducing the surface temperature of the functional aspect of the heat island phenomenon of the permeable block which is made the recycled synthetic resin rather than the existing concrete permeable block. Field measurement was taken for 3 days in consideration of dry condition and wet condition and laboratory experiment was divided into dry condition, rainfall simulating condition, and wetting condition. The variations of temperature and the evaporation rate of water moisture content after experiment were confirmed. As a result of field measurement, it is confirmed that the surface temperature decreases due to the difference in albedo of the pore block surface rather than the cooling effect due to the latent heat of vaporization. The evaporation of moisture in a dry state where drought persisted or a certain level of moisture was not maintained in the surface layer. As a result of laboratory experiment, resin permeable block gives higher surface temperature when it is dry condition than concrete permeable block, but the evaporation of water in the pore is kept constant by capillary force in rainfall simulation condition, and higher temperature reduction rate. As a result of measuring the evaporation rate after laboratory experiment, it is confirmed that the effect of reducing temperature is increased as the evaporation rate of water is higher. Based on these results, correlation formula for evaporation rate and temperature reduction rate is derived.
{"title":"Experimental Study on Reducing Effect for Surface Temperature of Recycled Synthetic-Resin Permeable Block","authors":"Chul-Hee Lee, Arum Lee, E. Shin, B. Ryu","doi":"10.12814/JKGSS.2019.18.1.079","DOIUrl":"https://doi.org/10.12814/JKGSS.2019.18.1.079","url":null,"abstract":"The field measurement and laboratory experiment were conducted to investigate the effect of reducing the surface temperature of the functional aspect of the heat island phenomenon of the permeable block which is made the recycled synthetic resin rather than the existing concrete permeable block. Field measurement was taken for 3 days in consideration of dry condition and wet condition and laboratory experiment was divided into dry condition, rainfall simulating condition, and wetting condition. The variations of temperature and the evaporation rate of water moisture content after experiment were confirmed. As a result of field measurement, it is confirmed that the surface temperature decreases due to the difference in albedo of the pore block surface rather than the cooling effect due to the latent heat of vaporization. The evaporation of moisture in a dry state where drought persisted or a certain level of moisture was not maintained in the surface layer. As a result of laboratory experiment, resin permeable block gives higher surface temperature when it is dry condition than concrete permeable block, but the evaporation of water in the pore is kept constant by capillary force in rainfall simulation condition, and higher temperature reduction rate. As a result of measuring the evaporation rate after laboratory experiment, it is confirmed that the effect of reducing temperature is increased as the evaporation rate of water is higher. Based on these results, correlation formula for evaporation rate and temperature reduction rate is derived.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":"19 1","pages":"79-89"},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89602900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.12814/jkgss.2019.18.1.025
Jae-Won Yoo, J. Im, Sang-Kyun Kang, Hyung-Jun Lee, Moon-Bong Choi
This study confirms reinforcing effect of geosynthetics in the use of soil at higher water contents as a compaction material on compaction tests, field compaction tests, and numerical analysis. To verify a confined effect, a large mold(area ratio of rammer / mold = 0.19) larger than D compaction mold(area ratio of rammer / mold = 0.33) was performed for compaction. It showed that in the D compaction test, dry density were 0.5∼0.6% increases and in the compaction test using the large mold, it were 2.4∼3.7% increases at high water contents. It shows that when the area of compacted area is large enough, a confined effect could be arising from the reinforcement of geosynthetics even at high water contents. As a result of analyzing of compaction effects according to ‘depth(z/B) from compacted surface’ in the field, when not reinforced, the compaction state deteriorated due to the over-compaction and the compaction did not work well. However, when reinforcement of geosynthetics, restraint effect by geosynthetics occurs, it is confirmed that the compaction energy is effectively transferred to the compaction layer and the dry density is increased. Also, through the conceptual model of the behavior of geosynthetic and soil layer, the mechanism in the ground due to reinforcement of geosynthetics is presented and it is verified through finite element analysis.
{"title":"A Study on the Confined Effects of Highly Moistured Soils Reinforced with Geosynthetics","authors":"Jae-Won Yoo, J. Im, Sang-Kyun Kang, Hyung-Jun Lee, Moon-Bong Choi","doi":"10.12814/jkgss.2019.18.1.025","DOIUrl":"https://doi.org/10.12814/jkgss.2019.18.1.025","url":null,"abstract":"This study confirms reinforcing effect of geosynthetics in the use of soil at higher water contents as a compaction material on compaction tests, field compaction tests, and numerical analysis. To verify a confined effect, a large mold(area ratio of rammer / mold = 0.19) larger than D compaction mold(area ratio of rammer / mold = 0.33) was performed for compaction. It showed that in the D compaction test, dry density were 0.5∼0.6% increases and in the compaction test using the large mold, it were 2.4∼3.7% increases at high water contents. It shows that when the area of compacted area is large enough, a confined effect could be arising from the reinforcement of geosynthetics even at high water contents. As a result of analyzing of compaction effects according to ‘depth(z/B) from compacted surface’ in the field, when not reinforced, the compaction state deteriorated due to the over-compaction and the compaction did not work well. However, when reinforcement of geosynthetics, restraint effect by geosynthetics occurs, it is confirmed that the compaction energy is effectively transferred to the compaction layer and the dry density is increased. Also, through the conceptual model of the behavior of geosynthetic and soil layer, the mechanism in the ground due to reinforcement of geosynthetics is presented and it is verified through finite element analysis.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":"5 1","pages":"25-37"},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83614443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.12814/JKGSS.2019.18.4.075
S. Seo, Hyunsik Jin, Dongwook Kim, M. Chung
Limit state design has been implemented in Korea since 2015; however, there exists no specification of lateral load determination on retaining wall due to the Korean standard traffic load on retaining wall’s backfill surface. The lateral load from traffic depends on lane number, standard truck’s axle loads and locations, loading distance from the inner wall. The concept of equivalent height of soil accounting for traffic loadings is typically used for design of retaining walls to quantify the traffic loads transmitted to the inner wall faces. Due to the different characteristics of the standard design trucks between Korea and US (AASHTO), the direct use of the guidelines from AASHTO LRFD leads to incorrect estimation of traffic load effects on retaining walls. This paper presents the results of evaluation of equivalent height of soil to reflect the Korean standard truck, based on the findings from analytical solutions using Bounessq’s theory and numerical assessment using 2D finite element method. Consequently, it was found that the equivalent heights of soil from the Korean standard truck load were lower for lower retaining wall height.
{"title":"Assessment of Equivalent Heights of Soil for the Lateral Earth Pressure Against Retaining Walls Due to Design Truck Load by 3D Numerical Analysis","authors":"S. Seo, Hyunsik Jin, Dongwook Kim, M. Chung","doi":"10.12814/JKGSS.2019.18.4.075","DOIUrl":"https://doi.org/10.12814/JKGSS.2019.18.4.075","url":null,"abstract":"Limit state design has been implemented in Korea since 2015; however, there exists no specification of lateral load determination on retaining wall due to the Korean standard traffic load on retaining wall’s backfill surface. The lateral load from traffic depends on lane number, standard truck’s axle loads and locations, loading distance from the inner wall. The concept of equivalent height of soil accounting for traffic loadings is typically used for design of retaining walls to quantify the traffic loads transmitted to the inner wall faces. Due to the different characteristics of the standard design trucks between Korea and US (AASHTO), the direct use of the guidelines from AASHTO LRFD leads to incorrect estimation of traffic load effects on retaining walls. This paper presents the results of evaluation of equivalent height of soil to reflect the Korean standard truck, based on the findings from analytical solutions using Bounessq’s theory and numerical assessment using 2D finite element method. Consequently, it was found that the equivalent heights of soil from the Korean standard truck load were lower for lower retaining wall height.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":"12 1","pages":"75-85"},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78701648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.12814/JKGSS.2019.18.4.001
In-Hwan Lee, Chul-Hee Lee, E. Shin
The purpose of this study is to examine the effect of soft ground improvement by dynamic replacement with utilizing crushed rock. In order to understand the ground improvement effect when applying dynamic replacement method with crushed rock, the laboratory test and field test were performed. The internal friction angle and apparent cohesion were derived through direct shear test. The dynamic replacement characteristics were identified by analyzing the weight, drop, and number of blows needed for dynamic replacement. Through the field plate bearing test and density test, the bearing capacity and settlement of the improved ground were measured, and the numerical analysis were conducted to analyze the behavior of the improved ground. In this study, it proposes modified soil experimental coefficient( ) to 0.3~0.5 in the dynamic replacement method with crushed rock. Also when applying the dynamic replacement method using crushed rock, the particle size range is less than 100 mm, D90 is less than 80 mm and D15 is more than 30 mm.
本研究的目的是考察利用碎石动态置换软土地基改造的效果。为了解采用碎石动态置换法对地基的改善效果，进行了室内试验和现场试验。通过直剪试验推导了内摩擦角和表观黏聚力。通过分析动态更换所需的重量、下落和击打次数，确定了动态更换特性。通过现场板承试验和密度试验，测量了改良地基的承载力和沉降，并进行了数值分析，分析了改良地基的性能。本研究提出在碎石动态置换法中，修正土壤试验系数()为0.3~0.5。采用碎石动态置换法时，粒径范围小于100 mm, D90小于80 mm, D15大于30 mm。
{"title":"Improvement Effect and Field Application of Dynamic Replacement Using Crushed Rock","authors":"In-Hwan Lee, Chul-Hee Lee, E. Shin","doi":"10.12814/JKGSS.2019.18.4.001","DOIUrl":"https://doi.org/10.12814/JKGSS.2019.18.4.001","url":null,"abstract":"The purpose of this study is to examine the effect of soft ground improvement by dynamic replacement with utilizing crushed rock. In order to understand the ground improvement effect when applying dynamic replacement method with crushed rock, the laboratory test and field test were performed. The internal friction angle and apparent cohesion were derived through direct shear test. The dynamic replacement characteristics were identified by analyzing the weight, drop, and number of blows needed for dynamic replacement. Through the field plate bearing test and density test, the bearing capacity and settlement of the improved ground were measured, and the numerical analysis were conducted to analyze the behavior of the improved ground. In this study, it proposes modified soil experimental coefficient( ) to 0.3~0.5 in the dynamic replacement method with crushed rock. Also when applying the dynamic replacement method using crushed rock, the particle size range is less than 100 mm, D90 is less than 80 mm and D15 is more than 30 mm.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":"90 1","pages":"1-13"},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84119073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.12814/JKGSS.2019.18.4.181
Jihuan Jin, Tae-ho Lee, JeongUk Yoo, E. Im, Seungjoon Lee, Yong-seong Kim
Most of the reservoirs in South Korea are fill dam, and overflow and piping phenomena have been detected as the main causes of failure of fill dam. In this study, an operating OO reservoir located in Gongju-si is modeled in centrifuge model test to study the behavior of reservoir during water level rise and overflow conditions. In order to simulate seepage and overflow in the real reservoir, the model was constructed in 1/50 scale, and deteriorated and reinforced conduits were installed. After modeling the reinforced and deteriorated conditions of the conduits, LVDTs, pore pressure gauges were installed and centrifuge model tests were carried out with water level rise and overflow conditions in order to analyze the reservoir behavior according to the reinforcement methods. The results of centrifuge model test in water level rise condition show that deteriorated conduit has adverse effects in the stability of the reservoir body, and the conduit which is reinforced by the inverse lining method has enhanced stability of the reservoir body. Moreover, installation of water spillway is seen to prevent the scour and erosion of the reservoir body. The study provides a basic data required for the reinforcement of conduit and water spillway in the reservoir.
{"title":"An Experimental Study on Overflow and Internal Erosion Protection Technology of a Reservoir","authors":"Jihuan Jin, Tae-ho Lee, JeongUk Yoo, E. Im, Seungjoon Lee, Yong-seong Kim","doi":"10.12814/JKGSS.2019.18.4.181","DOIUrl":"https://doi.org/10.12814/JKGSS.2019.18.4.181","url":null,"abstract":"Most of the reservoirs in South Korea are fill dam, and overflow and piping phenomena have been detected as the main causes of failure of fill dam. In this study, an operating OO reservoir located in Gongju-si is modeled in centrifuge model test to study the behavior of reservoir during water level rise and overflow conditions. In order to simulate seepage and overflow in the real reservoir, the model was constructed in 1/50 scale, and deteriorated and reinforced conduits were installed. After modeling the reinforced and deteriorated conditions of the conduits, LVDTs, pore pressure gauges were installed and centrifuge model tests were carried out with water level rise and overflow conditions in order to analyze the reservoir behavior according to the reinforcement methods. The results of centrifuge model test in water level rise condition show that deteriorated conduit has adverse effects in the stability of the reservoir body, and the conduit which is reinforced by the inverse lining method has enhanced stability of the reservoir body. Moreover, installation of water spillway is seen to prevent the scour and erosion of the reservoir body. The study provides a basic data required for the reinforcement of conduit and water spillway in the reservoir.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":"152 1","pages":"181-191"},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80996816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.12814/JKGSS.2019.18.4.015
Soon-Ju Choi, Jintae Kim, Myung-Sik Choi, Soo-Ho Chang, T. Kang, Chulho Lee
The sprayable waterproofing membrane is a recently introduced material in the civil engineering field, and is a material that sprays and attaches a single phase or two phase powder or liquid material to a surface to be covered using a pump and nozzle. Although the material properties are gradually reported through researches, there is a lack of studies on long-term performance compared to concrete materials used with the membranes. In this study, the long-term performance of materials was estimated using the Arrhenius equation. The temperature conditions used in this study were 65°C, 80°C and 95°C, and the temperature was maintained with the membrane attached to the concrete block for long-term behavior. Then the membranes were tested for tensile strength and adhesion strength in the order of 30, 90, 150, 200, and 300 days. The long-term performance of the material was determined from a long-term perspective by estimating the activation energy by the Arrhenius equation. Consequently, the time to reach 50% of the performance standard could be estimated by long-term test.
{"title":"Experimental Study on Long-term Characteristics of Sprayable Waterproofing Membrane","authors":"Soon-Ju Choi, Jintae Kim, Myung-Sik Choi, Soo-Ho Chang, T. Kang, Chulho Lee","doi":"10.12814/JKGSS.2019.18.4.015","DOIUrl":"https://doi.org/10.12814/JKGSS.2019.18.4.015","url":null,"abstract":"The sprayable waterproofing membrane is a recently introduced material in the civil engineering field, and is a material that sprays and attaches a single phase or two phase powder or liquid material to a surface to be covered using a pump and nozzle. Although the material properties are gradually reported through researches, there is a lack of studies on long-term performance compared to concrete materials used with the membranes. In this study, the long-term performance of materials was estimated using the Arrhenius equation. The temperature conditions used in this study were 65°C, 80°C and 95°C, and the temperature was maintained with the membrane attached to the concrete block for long-term behavior. Then the membranes were tested for tensile strength and adhesion strength in the order of 30, 90, 150, 200, and 300 days. The long-term performance of the material was determined from a long-term perspective by estimating the activation energy by the Arrhenius equation. Consequently, the time to reach 50% of the performance standard could be estimated by long-term test.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":"107 1","pages":"15-23"},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77445817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.12814/JKGSS.2019.18.4.263
K. Lee, S. You, Jeongjun Park, Jung-Mann Yun, G. Hong
This paper describes the results of bearing capacity using field loading test of pile, in order to extend the applicability of drilled shaft with mid-size, and the results were compared with the prediction results of design bearing capacity by empirical formular. The static load test result showed that the allowable bearing capacity of high pile strength was about 2.4 times higher than that of low pile strength. The dynamic load test result showed that the allowable bearing capacity of high pile strength was about 1.4 times∼1.5 times higher than that of low pile strength. The comparison result of allowable bearing capacity between static and dynamic load test showed that the difference of allowable load ranged from 3% to 6% under the same settlement conditions. As a result of comparing the ultimate bearing capacity by load test and design bearing capacity, it was found that the FHWA proposed equation could be more reasonable than the other proposed equation in load sharing ratios of end bearing and skin friction.
{"title":"An Experimental Study on Bearing Capacity of Drilled Shaft with Mid-size","authors":"K. Lee, S. You, Jeongjun Park, Jung-Mann Yun, G. Hong","doi":"10.12814/JKGSS.2019.18.4.263","DOIUrl":"https://doi.org/10.12814/JKGSS.2019.18.4.263","url":null,"abstract":"This paper describes the results of bearing capacity using field loading test of pile, in order to extend the applicability of drilled shaft with mid-size, and the results were compared with the prediction results of design bearing capacity by empirical formular. The static load test result showed that the allowable bearing capacity of high pile strength was about 2.4 times higher than that of low pile strength. The dynamic load test result showed that the allowable bearing capacity of high pile strength was about 1.4 times∼1.5 times higher than that of low pile strength. The comparison result of allowable bearing capacity between static and dynamic load test showed that the difference of allowable load ranged from 3% to 6% under the same settlement conditions. As a result of comparing the ultimate bearing capacity by load test and design bearing capacity, it was found that the FHWA proposed equation could be more reasonable than the other proposed equation in load sharing ratios of end bearing and skin friction.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":"36 1","pages":"263-272"},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82528862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.12814/JKGSS.2019.18.4.063
E. Shin, H. Lee
In this study, it was studied recycled soils with bentonite-polymer mixture in order to design economic landfill instead of clay liner. Recycled soil was used as SP, a sandy soil with 90.58% sand and 1.88% silt and clay. The recycled soils were mixed with 4%, 6%, and 8% bentonite by weight, and then compared with samples mixed with 2%, 3%, and 4% bentonite by weight in marine clay. Recycled soil satisfied the permeability criteria at 8%, and clay soil satisfied at 3%. In order to make a sample that satisfies the standard of the waste landfill, a permeability test was conducted by mixing 0.16%, 0.24%, and 0.28% of the polymer in a sample having 4% bentonite mixing ratio. The unconfined compression strength test was carried out at the same mixing ratio to confirm that the specification was satisfied. As the bentonite mixture ratio increased, the permeability coefficient and unconfined compression strength decreased. The strength in polymer mixing increased initially and then maintained a constant value. At 4% bentonite mixing ratio and 0.28% polymer mixing ratio, the coefficient of permeability was 1.0×10cm/sec or less, and the unconfined compression strength was over 500 kPa. It was confirmed that it can be used as a mixed liner material of waste landfills.
{"title":"Applicability of Recycled Soil Mixed with Bentonite-Polymer for Waste Landfill Liner","authors":"E. Shin, H. Lee","doi":"10.12814/JKGSS.2019.18.4.063","DOIUrl":"https://doi.org/10.12814/JKGSS.2019.18.4.063","url":null,"abstract":"In this study, it was studied recycled soils with bentonite-polymer mixture in order to design economic landfill instead of clay liner. Recycled soil was used as SP, a sandy soil with 90.58% sand and 1.88% silt and clay. The recycled soils were mixed with 4%, 6%, and 8% bentonite by weight, and then compared with samples mixed with 2%, 3%, and 4% bentonite by weight in marine clay. Recycled soil satisfied the permeability criteria at 8%, and clay soil satisfied at 3%. In order to make a sample that satisfies the standard of the waste landfill, a permeability test was conducted by mixing 0.16%, 0.24%, and 0.28% of the polymer in a sample having 4% bentonite mixing ratio. The unconfined compression strength test was carried out at the same mixing ratio to confirm that the specification was satisfied. As the bentonite mixture ratio increased, the permeability coefficient and unconfined compression strength decreased. The strength in polymer mixing increased initially and then maintained a constant value. At 4% bentonite mixing ratio and 0.28% polymer mixing ratio, the coefficient of permeability was 1.0×10cm/sec or less, and the unconfined compression strength was over 500 kPa. It was confirmed that it can be used as a mixed liner material of waste landfills.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":"92 1","pages":"63-73"},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77319760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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