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여유현(Yeoh Yoo-Hyeon),천병식(Chun Byung-Sik) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Recenlty, there are many cases that structures are constructed on soft ground in domestic. Generally in those cases, appropriate geotechnical techniques for the ground are needed. In this study, an example for ground improvement of 00 railroad station construction site is introduced and analyzed. The ground conditions of this site which is soft ground are that N value is under 6, average depth and ground water table is 24.4m, GL-1.7. So, as a countermeasure technique for bearing reinforcement, Compaction Grouting System (CGS) method was applied on construction site. To estimate the application of CGS method, piezo cone penetration test and static pile loading test were carried out during the construction. Results of analysis show that CGS method for improving the bearing capacity of soft ground is applicable for the ground well.
Granular Pile에 의해 개량된 연약지반의 지지력 및 침하특성
천병식(Chun Byung-Sik),여유현(Yeoh Yoo-Hyeon) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Sand Compaction Pile (SCP) method, which uses sand material, is frequently used in Korea. However, the use of sand for SCP faces environmental and economical problems with the shortage of its resources. Therefore, it is necessary to substitute other materials for compaction piles. One of the alternatives is using gravel in lieu of sand. Granular Pile, constituted with sand and crushed-stone, is one of the methods to improve soft clay and loose sandy ground. In this study, modeled pile load tests are performed in test cell. The observations are made on the consolidation and the variation of water table of three different grounds, original, sand pile installed, and granular pile installed ground. In addition, engineering characteristics such as bearing capacity, settlement and drainage are investigated. The test results show that Gravel Compaction Pile (GCP) is more efficient for increasing bearing capacity and reducing settlement than SCP and had similar pore water pressure dissipation to sand. Therefore, the results show that GCP can be a good substitution for SCP.
천병식 ( Chun Byung-sik ),여유현 ( Yeoh Yoo-hyeon ),최현석 ( Choi Hyun-seok ),이준우 ( Lee Jun-woo ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
The NATM has been used for tunnelling since 1980's. But collapses of tunnel under construction take place frequently, especially at urban areas because of adjacent buildings, underground conduits and traffic loads. This paper is a case study on the reinforcement method of subway tunnel at urban areas. In this study, ground inspection, geological investigation, laboratory test and numerical analysis by means of FDM program were carried out. The tunnel excavation was stopped because of over excessive brake of tunnel crown and shotcrete was installed to prevent deformation of adjacent ground as the temporary method. From the result of field survey and geological investigation, it is found that the soft weathered soil was distributed to the ground of tunnel invert unlike original investigation. The results of the analysis and the study show that the SGR(Space Grouting Rocket) method and Umbrella method can be applied for the stability of tunnel excavation and in addition the reinforcement of concrete lining is required for long-term stability of tunnel.
천병식(Chun Byung-Sik),여유현(Yeoh Yoo-Hyeon),최현석(Choi Hyun-Seok),오일석(Oh Il-Seok) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
The use of compaction grouting system(C.G.S) evolved in the 1950"s to correct structural settlement of buildings. Over the almost 50 years, the technology has developed and is currently used in wide range of applications. Compaction Grouting, the injection of a very stiff, "zero-slump" mortar grout under relatively high pressure, displaces and compacts soils. It can effectively repair natural or man-made soil strength deficiencies in variety of soil formations. Major uses of Compaction Grouting include densifying loose soils or fill voids caused by sinkholes, poorly compacted fills, broken utilities, improper dewatering, or soft ground tunneling excavation. Other application include preventing liquefaction, re-leveling settled structures, and using compaction grout bulbs as structural elements of minipiles or underpinning. So, on the basis of the case history constructed in recent year, a study has been performed to analyze the basic mechanism of the Compaction Grouting and verify the effectiveness of the ground improvement.
천병식(BYUNG-SIK CHUN),여유현(YOO-HYEON YEOH) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.1
The purpose of this paper is to recycle coal ash as structural backfill materials from electric power plants. Two million tons of coal ash are produced annually. The laboratory test was executed for the basic compatibility as substitution for structural backfill materials, and the optimal mixture ratio(fly ash : bottom ash) was decided. In addition, the model test was performed using medium scale earth pressure model with small size earth pressure cells, model box, data logger and some other apparatuses. Mixed coal ash and excellent backfill materials(cohesionless soil, SW) were compared in the view of lateral earth pressure variation depending on wall displacement. The reduction of earth pressure when coal ash was used as a backfill material was monitored comparing to that of cohesionless soil. The cost and environmental pollutants by treating coal ash can be reduced through developing the recycling technology.
천병식 ( Chun¸ Byung-sik ),여유현 ( Yeoh¸ Yoo-hyeon ),임병수 ( Lim¸ Byoung-soo ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
In this study, the evaluation for utilization of waste landfill was performed by field test to use waste landfill as construction site(Nangido in Seoul). This site had been formed by dredging the household waste, building debris and industrial waste for fifteen years(78'3 ~93'3). The site where dynamic compaction test was carried out was divided by 4 yard. Yard 1, 2 were not eliminated widening of cover soil and Yard 3, 4 were eliminated it. Dynamic Compaction Pilot Test was carried out by the 15ton heavy tamper with drop height of 20m in Yard 1, 3 and with drop height of 15m in Yard 2, 4. We evaluated the compaction ability, optimum compaction number and noise · vibration through field test, monitoring. As a result, If the countermeasures against vibration and noise by the method utilize, The dynamic compaction method is suitable for using in waste landfill as a construction site among the ground improvement method.