• Title/Summary/Keyword: geotechnical monitoring

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Technical Issues for Offshore Wind-Energy Farm and Monopile Foundation (해상풍력 발전의 기술동향 및 모노파일 기술개발 방향)

  • Choi, Chang-Ho;Cho, Sam-Deok;Kim, Ju-Hyong;Chae, Jong-Gil
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09a
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    • pp.486-493
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    • 2010
  • Recently, it has been a worldwide issue to develop offshore wind farm based on the past technical experiences of onshore wind turbine installation. In Korea, the government has the wind-energy to be a new-sustainable field of development to bring green-growth in near future and put political and fiscal efforts to support the academic and industrial technical development. Especially, there are much advancement for the fields of turbine, blade, bearing, grid connection, ETC. Correspondingly, technical needs do exist for the offshore foundation installation techniques in geotechnical point of view. Within few years, 2~5MW offshore wind turbines will be constructed at about 30m water depth and it is known that monopiles of D=4~6m are suitable types of foundation. In order to construct offshore wind-turbine foundation, technical developments for drilling machine, design manual, monitoring&maintenance technique are required. This paper presents technical issues with related to offshore wind farm and large diameter monopile in the point of renewable energy development.

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Application of Digital Photogrammetry Technique in Geotechnical Engineering (지반공학에서의 수치영상기법의 활용)

  • Han, Jung-Geun;Hong, Ki-Kwon;Cho, Sam-Deok;Lee, Kwang-Wu
    • Proceedings of the Korean Geotechical Society Conference
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    • 2007.09a
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    • pp.465-477
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    • 2007
  • Recently a number of research has been performed for the combination of new high technologies in order to find the solutions for various problems in civil engineering research field. Various high-tech measuring instruments have been applied to the geotechnical engineering field, and many attempts have also been performed for the more accurate measurements. Especially, the researches using image on the digital photogrammetry technique are gradually extending nowadays. The computer program developed using the digital photogrammetry technique and the case studies are explained and presented in this paper. Therefore, it could be considered that not only the measurement with high-accuracy but the disaster prevention should be available through the practical use of digital photogrammetry technique. The applicability would also be increased in the measurement of both the geotechnical engineering field as well as other research fields.

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Vertical Z-vibration prediction model of ground building induced by subway operation

  • Zhou, Binghua;Xue, Yiguo;Zhang, Jun;Zhang, Dunfu;Huang, Jian;Qiu, Daohong;Yang, Lin;Zhang, Kai;Cui, Jiuhua
    • Geomechanics and Engineering
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    • v.30 no.3
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    • pp.273-280
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    • 2022
  • A certain amount of random vibration excitation to subway track is caused by subway operation. This excitation is transmitted through track foundation, tunnel, soil medium, and ground building to the ground and ground structure, causing vibration. The vibration affects ground building. In this study, the results of ANSYS numerical simulation was used to establish back-propagation (BP) neural network model. Moreover, a back-propagation neural network model consisting of five input neurons, one hidden layer, 11 hidden-layer neurons, and three output neurons was used to analyze and calculate the vertical Z-vibration level of New Capital's ground buildings of Qingdao Metro phase I Project (Line M3). The Z-vibration level under different working conditions was calculated from monolithic roadbed, steel-spring floating slab roadbed, and rubber-pad floating slab roadbed under the working condition of center point of 0-100 m. The steel-spring floating slab roadbed was used in the New Capital area to monitor the subway operation vibration in this area. Comparing the monitoring and prediction results, it was found that the prediction results have a good linear relationship with lower error. The research results have good reference and guiding significance for predicting vibration caused by subway operation.

A Stability Case on the Deep Rock Excavation Site in Urban Area by Automatic Monitoring System (도심지 대심도 암반굴착공사에서의 자동계측 활용에 의한 붕괴방지 사례)

  • Kim, Tae-Seob;Jo, Nam-Shin;Jung, Chang-Won
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.03a
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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.

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A Case Study for Quality Confirmation and Maintenance Monitoring of Tunnel Underpassing the Han River (하저터널 품질확인 및 유지관리 계측 연구)

  • Woo, Jong Tae;Yang, Tae Seon;Koo, Jai Dong
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.2 no.2
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    • pp.185-194
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    • 1998
  • This paper shows a case study on quality confirmation and maintenance monitoring of the tunnel underpassing the Han River. First of all, when it comes to the quality confirmation, soil investigation techniques and shotcrete core test will be improved. On the construction stages, quality control procedures are needed. Second, on the maintenance monitoring, it is the main tool to control stability and safety of the tunnel structures throughout the construction period. On the geotechnical monitoring instrumentation, some considerations such as installation of monitoring sections in time, immediate base readings, adequate reading frequency, etc - shall be improved.

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Project Risk Management & Observational Method for soft ground improvement (연약지반을 대상으로 한 프로젝트 리스크와 현장계측의 과제와 대책)

  • Imanishi, Hajime
    • Proceedings of the Korean Geotechical Society Conference
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    • 2006.10a
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    • pp.509-514
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    • 2006
  • Considering the risk management, there are many examples and various studies for the corporation risk. However, I have never seen the project risk management that applied a construction site for practical approach. Therefore, I have developed a chart (I-Chart) for the project risk management, and also built a model (I-Chart scenario analysis) that I could use. I applied this model to container yard reclaimed land in harbor construction with approaching of geotechnical engineering.

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