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Development of penetration rate model and optimum operational conditions of shield TBM for electricity transmission tunnels

터널식 전력구를 위한 순굴진율 모델 개발 및 이를 활용한 쉴드TBM 최적운전 조건 제안

  • Kim, Jeong-Ju (Next Generation Transmission & Substation Laboratory, KEPCO Research Institute, KEPCO) ;
  • Ryu, Hui-Hwan (Technology Planning Department, Technology Strategy Team, KEPCO) ;
  • Kim, Gyeong-Yeol (Next Generation Transmission & Substation Laboratory, KEPCO Research Institute, KEPCO) ;
  • Hong, Seong-Yeon (Next Generation Transmission & Substation Laboratory, KEPCO Research Institute, KEPCO) ;
  • Jeong, Ju-Hwan (Next Generation Transmission & Substation Laboratory, KEPCO Research Institute, KEPCO) ;
  • Bae, Du-San (Next Generation Transmission & Substation Laboratory, KEPCO Research Institute, KEPCO)
  • 김정주 (한전 전력연구원 차세대송변전연구소) ;
  • 류희환 (한전 기술기획처 기술전략실) ;
  • 김경열 (한전 전력연구원 차세대송변전연구소) ;
  • 홍성연 (한전 전력연구원 차세대송변전연구소) ;
  • 정주환 (한전 전력연구원 차세대송변전연구소) ;
  • 배두산 (한전 전력연구원 차세대송변전연구소)
  • Received : 2020.09.25
  • Accepted : 2020.11.09
  • Published : 2020.11.30

Abstract

About 5 km length of tunnels were constructed by mechanized tunnelling method using closed type shield TBM. In order to avoid construction delay problems for ensuring timely electricity transmission, it is necessary to increase the prediction accuracy of the excavation process involving machines according to rock mass types. This is important to corroborate the project duration and optimum operation for various considerations involved in the machine. So, full-scale tunnelling tests were performed for developing the advance rate model to be appropriately used for 3.6 m diameter shield TBM. About 100 test cases were established and performed using various operational parameters such as thrust force and rotational speed of cuttterhead in representative uniaxial compressive strengths. Accordingly, relationships between normal force and penetration depth and, between UCS and torque were suggested which consider UCS and thrust force conditions according to weathered, soft, hard rocks. Capacity analysis of cutterhead was performed and optimum operational conditions were also suggested based on the developed model. Based on this study, it can be expected that the project construction duration can be reduced and users can benefit from the provision of earlier service.