• 한국건축시공학회지
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• 제8권4호
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• pp.71-77
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• 2008

Earthwork is very equipment-intensive task and researches related to automated excavation have been conducted. There is an issue to secure the safety for an automated excavating system. Therefore, this paper focuses on how to improve safety for semi- or fully-automated backhoe excavation. The primary objective of this research is to develop the core technology for automated object detection in excavation work. In order to satisfy the research objective, a diverse sensing technologies are investigated and analysed in terms of functions, durability, and reliability. The authors developed detecting algorithm for the objects using laser sensor and verified its performance by several tests. The results of this study would be the basis for developing the automated object detection system.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1993년도 봄 학술발표회논문집
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• pp.207-212
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• 1993

In the construction of underground structures, it is critical to accurately predict the ground deformations during excavation. In this paper, a finite element procedure for the computation of solid displacement and fluid pore pressure during incremental excavation is presented based on Biot's theory. The numerical formulation is done using the virtual work principle. The proposed procedure is applied to some example problems with different excavation rates and permeabilities.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.1301-1306
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• 2009

Recently, urban excavations are one of most frequent geotechnical work according to construction of a high rise building and subway. These kind of excavation affect to a adjacent ground or structure and it can trigger various severe accidents. Generally, the ground is closer to the excavation site, the deformation become larger. In this study, special ground settlement case due to adjacent ground excavation is presented and a cause of deformation is examined by various geotechnical exploration, lab-testing and numerical analysis.

• 한국지반환경공학회 논문집
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• 제19권1호
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• pp.31-36
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• 2018

최근 건축공사가 활성화됨에 따라 기존 구조물과의 근접한 공사 그리고 인접 굴착공사와 병행하여 굴착공사가 진행되는 환경이 증가하고 있지만 이에 대한 연구는 미흡한 실정이다. 본 연구에서는 두 개의 굴착 흙막이 구조물에 대해 기존 굴착 흙막이 구조물과 후속 굴착 흙막이 구조물 간의 상호작용 분석을 위해 수치해석을 수행하였다. 수치해석 분석결과 선행 굴착으로 인해 작용하는 지보재의 하중을 고려하지 않는 경우 구조물에 발생하는 변위는 과소평가 될 수 있는 것으로 분석되었고, 지보재에 작용하는 응력은 과하게 평가되어 실제 지반의 거동을 모사하기 위해서는 선행굴착으로 인해 발생하는 지보재 응력을 고려해야 하는 것으로 분석되었다.

• 문화기술의 융합
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• 제9권3호
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• pp.669-676
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• 2023

본 연구는 인접굴착에 따른 기존 도시철도 박스구조물의 안전영역에 관한 연구로서 도시철도 주변에서 시행되는 각종 굴착공사에 따라 도시철도 박스구조물의 거동에 영향을 미치는 주요 매개변수와 수치해석 결과의 상관관계를 분석하였으며, 머신러닝 기법 적용을 통하여 인접굴착공사가 기존 도시철도 박스구조물에 미치는 영향 범위 및 안전영역의 적정성을 검증하였다. 본 연구는 도시철도 주변의 실제 협의된 인접굴착공사 및 박스구조물을 연구대상으로 하였으며, 그 중 가장 대표적인 본선 2련박스 구조물을 대상으로 분석을 수행하였다. 매개변수 분석 및 머신러닝 해석결과, 도시철도 깊이, 인접굴착공사 굴착깊이 및 지하수위 각각의 상호간의 깊이 차이가 중요한 매개변수인 것으로 확인되었으며, 그 중에서도 도시철도 깊이와 인접굴착공사의 굴착깊이 차이가 지하 박스구조물 거동에 가장 큰 영향을 미치는 매개변수이며, 안전영역 설정의 중요한 요건인 것으로 분석되었다. 특히, 인접굴착공사 깊이가 도시철도 깊이보다 더 깊게 굴착될수록 지하 박스구조물의 처짐에 미치는 영향은 더욱 큰 것으로 확인되었으며, 기존의 인접굴착공사 관리등급 결정 시 중요 요건 중 하나인 수평이격거리는 수직이격거리, 즉 굴착깊이에 비해 상대적으로 영향이 작은 것으로 분석되었다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회
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• pp.1065-1072
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• 2010

The excavation site in the new city of inchon songdo is distributed with soft reclaimed soil and marine deposit. So, the general ground anchor is not applied to this layer of soft ground as the earth retaining support system, because of settlement. And then, Jacket pack anchor which is newly developed in order to increasing the pullout resistance by certain grout bulb formation and expansion effect in soft ground is applied to this site instead of the general ground anchor. Though the maximum horizontal displacement shows about 30mm~100mm (The maximum horizontal displacement/excavation depth$\fallingdotseq$0.32~1.0%) according to excavation sequence, generally excavation work finished stably. Also, load cell after setting shows almost increasing trend with increasing horizontal displacement. It means that the settlement of Jacket pack anchor in soft ground is good. From the result of this case, we knew that Jacket pack anchor was able to use the earth retaining support system in soft ground. Using Jacket pack anchor in soft ground, The allowance of the horizontal displacement is applied more than general value considering soil factors.

• 한국안전학회지
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• 제19권2호
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• pp.112-118
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• 2004

Recently, when being constructed the large structures, the deep excavations have performed to utilize the underground space. As the ground excavation is deeper, the damage of the adjacent structure and the ground is frequently occurred. the Analysis of the retaining structures is necessary to safety of the excavation works. There are many methods such as elasto-plastic theory, FEM, and FDM to analyze the displacement of the retaining structure. In this thesis, GEBA-1 program by the Nakamura-Nakajawa elasto-plastic method was developed. The lateral displacement of the wall was analyzed by the developed program GEBA-1, SUNEX, and EXCAD, and compared with the measured displacement bye the Inclinometer. The monitored fields were three excavation work site in S-I, S-II, and S-III area. Excavation method of each site is braced retaining wall using H-pile. Excavation depth is 14m, 14m, and 8.2m.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 춘계 학술발표회
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• pp.1433-1437
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• 2010

The deep excavation work in Korean downtown is almost excuted near by existing structures and utility lines because of the diminution of available yard for construction. So, it was required more and more that the accurate control of displacement on the earth retaining system for minimizing the popular complaint and the damage from constructional accident. Automatic monitoring system is adopted in fracture zone for real time monitoring. In addition, Face mapping is carried out on the face of fracture zone according to excavation sequence. As the result of automatic monitoring system and face mapping, we was able to take the necessary reinforcement and changing excavation method within suitable time. This paper is informed about a stability case on the deep rock excavation site with fracture zone in urban area by automatic monitoring system.

• 대한토목학회논문집
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• 제32권3D호
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• pp.259-267
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• 2012

건설자동화 시스템 개발은 건설업이 당면하고 있는 여러 가지 어려움을 해결하고 급변하고 있는 건설환경을 위한 대응책으로 설득력 있는 해결책 중의 한가지로 제안되고 있다. 2006년부터 지능형 굴삭시스템 개발을 위한 연구가 진행되었다. 지능형 굴삭시스템은 작업환경 센싱, 3D 모델링, 작업계획, 작업경로계획, 무인조정 및 정보관리를 위한 다양한 기능을 갖고 있다. 본 논문에서는 지능형 굴삭시스템을 실제 현장에 적용하기 위하여 필요한 요소기술 중의 하나인 작업계획 및 작업경로계획 기능구현을 위한 공간정보모델과 작업경로 시뮬레이터를 제시하고자 한다. 기존의 자료구조인 쿼드트리나 옥트리 구조가 갖고 있는 단점을 보완하기 위하여 토공작업을 위한 새로운 자료구조를 제시하였다. 작업경로 시뮬레이터는 작업환경에 관한 정보, 토공장비에 관한 정보를 제공하며 작업자의 휴리스틱을 고려하여 효과적인 작업경로를 생성할 수 있다. 시뮬레이터에 의하여 생성된 작업경로와 굴삭기 운전자가 제안하고 있는 작업경로를 서로 비교하였다.

• 농업과학연구
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• 제38권1호
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• pp.101-108
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• 2011

In forest work, working conditions are very hard to improve. The proper distribution of work time and good posture is believed to bring about direct improvements such as accident prevention. On this, this study has analyzed forest workers' posture and their working hours in order to improve their working conditions in stone channel work. Authors has chosen several core elements of stone channel work to focus on, which include stone masonry, excavation of bed, moving stone, directing work, choosing stone, and breaking stone. The ratio of real working time over total working time was shown as 84.6%. As for the time ratio of each elemental work over the real working time, the stone masonry was 60.4%, the directing work was 15.1%, moving stone was 12.1%, choosing stone was 7.1%, breaking stone was 3.3%, and excavation of bed was 2.0%. According to the analytical results provided by OWAS, the ratio of category III (Work posture has a distinctly harmful effect on the musculoskeletal system) has shown that moving stone turned out 65.2%, choosing stone was 61.5%, stone masonry was 46.1%, breaking stone was 14.3%, excavation of bed was 12.5% and directing work was 6.8%. Furthermore, the ratio of category IV (Work posture with an extremely harmful effect on the musculoskeletal system) has shown that excavation of bed turned out 37.5%, breaking stone was 28.6%, stone masonry was 27.3%, choosing stone was 7.7%, moving stone was 6.1% and directing working was 4.5%. These results are expected to be utilized for the improvement with respect to both working methods in the stone channel work and the workers' working posture.