Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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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
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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.

터널식 전력구는 약 5 km 이내의 연장을 기계식 굴착장비인 밀폐형 쉴드TBM을 이용하여 건설된다. 공기지연 예방 및 적기가압을 위해서는 암반등급별 공사기간의 예측정확도를 향상시켜야하며, 투입된 장비의 성능을 고려한 최적운전이 필수적이다. 이에 본 연구에서는 3.6 m급 쉴드TBM에 적합한 순굴진율 모델을 개발하고자 실대형 굴진시험을 수행하였다. 대표적인 일축압축강도에 대해서 소요추력과 커터헤드 회전속도를 바탕으로 약 100회의 실험을 수행하였다. 이에 풍화암, 연암, 경암분류에 따라 일축압축강도와 장비의 소요추력 조건이 고려된 연직력과 압입깊이 및 일축압축강도와 토크와의 상관관계를 제시하였다. 개발된 순굴진율 모델을 바탕으로 구동부 성능분석과 최적운전 조건에 대해 제시하였다. 본 연구결과를 통해 터널식 전력구 공사기간 단축 및 조기사용에 대한 사용자 편익증대를 기대할 수 있다.

Keywords

References

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