DOI QR코드

DOI QR Code

Case study on slurry performance according to the recycling of slurry TBM filtrate water with coagulant

이수식 TBM의 응집제 사용수 재활용에 따른 슬러리 성능 연구

  • Han-Byul Kang (R&D Department, Hyundai Engineering & Construction) ;
  • Jae-Won Lee (R&D Department, Hyundai Engineering & Construction) ;
  • Ju-Hyi Yim (R&D Department, Hyundai Engineering & Construction) ;
  • Byung-Cheol Ahn (Kimpo and Paju Expressway No.400 (Section No.2), Hyundai Engineering & Construction) ;
  • Young Jin Shin (R&D Department, Hyundai Engineering & Construction)
  • 강한별 (현대건설 기술연구원) ;
  • 이재원 (현대건설 기술연구원) ;
  • 임주휘 (현대건설 기술연구원) ;
  • 안병철 (현대건설 고속국도 제400호선 김포-파주간 건설공사 제2공구) ;
  • 신영진 (현대건설 기술연구원)
  • Received : 2024.07.22
  • Accepted : 2024.08.16
  • Published : 2024.09.30

Abstract

The use of tunnel boring machine (TBM), a mechanized excavation method with low noise and vibration and high safety compared to NATM method, has increased globally. In particular, slurry shield TBMs are used in subsea and submarine sections because they have an advantage in high pressure compared to EPB (earth pressure balanced) methods. As such, the used water of slurry shield TBMs is discharged through wastewater treatment facilities. In the case of large-scale TBMs, the amount of water used is enormous, so it should be recycled to reduce costs and protect the environment. Various types of additives are used to improve the performance of the slurry treatment plant (STP) and filter press. Among them, coagulants improve the productivity of the filter press by neutralizing the charges on particles. In this study, lab tests were conducted to evaluate the reusability of the used water through the filter press after flocculants were added.

NATM 공법과 비교하여 소음 및 진동이 적고 안전성이 높은 기계화 굴착공법인 TBM (tunnel boring machine)의 사용이 전 세계적으로 증가하였다. 특히 이수식(slurry shield) TBM의 경우 EPB (earth pressure balanced) 방식에 비해 고수압에 유리하므로 하저 및 해저 구간 등에서 많이 사용된다. 이와 같이 이수식 TBM의 사용수는 오폐수처리시설을 거쳐 방류된다. 대단면 TBM의 경우, 사용되는 물의 양이 막대하기 때문에 재활용을 통해 비용 저감 및 환경 보호가 가능하다. 이수식 TBM에서는 지상의 이수처리시설인 STP (slurry treatment plant)와 필터프레스(filter press)의 성능을 향상시키기 위해 다양한 종류의 첨가제를 사용한다. 이 중 응집제는 버력의 응집도를 높여 필터프레스의 생산성을 향상시킨다. 본 연구에서는 응집제가 투입된 후 필터프레스를 통해 걸러진 사용수에 대한 실내시험을 시행하여 재사용 가능 여부를 평가하였다.

Keywords

Acknowledgement

이 논문은 2024년도 정부(산업통상자원부)의 재원으로 사용후핵연료관리핵심기술개발사업단 및 산업부 한국에너지기술평가원의 지원을 받아 수행된 연구 사업의 일환으로 수행되었습니다(No. 2021040101003C). 이에 감사드립니다.

References

  1. Duhme, R., Tatzki, T. (2015), "Designing TBMs for subsea tunnels", Journal of Korean Tunnelling and Underground Space Association, Vol. 17, No. 6, pp. 587-596. https://doi.org/10.9711/KTAJ.2015.17.6.587
  2. Gang, S.G., Jung, J.W. (2021), "Swelling characteristics of clay minerals according to the ionic strength in pore water", Journal of the Korean Society of Hazard Mitigation, Vol. 21, No. 6, pp. 201-207. https://doi.org/10.9798/KOSHAM.2021.21.6.201
  3. Jeon, H.Y., Park, Y.M., Mok, M.S. (2002), "Assessment of hydraulic properties of bentonite swelling agents by blending with additives", Journal of the Korean Geosynthetics Society, Vol. 1, No. 1, pp. 43-51.
  4. Jeong, S.W. (2011), "The rheological characteristics of Wyoming bentonite: role of salinity", Journal of the Korean Geotechnical Society, Vol. 27, No. 10, pp. 81-92. https://doi.org/10.7843/kgs.2011.27.10.081
  5. Kim, D.Y., Lee, J.W., Jung, J.H., Kang, H.B., Jee, S.H. (2017), "A fundamental study of slurry management for slurry shield TBM by sea water influence", Journal of Korean Tunnelling and Underground Space Association, Vol. 19, No. 3, pp. 463-473. https://doi.org/10.9711/KTAJ.2017.19.3.463
  6. Min, F., Du, J., Zhang, N., Chen, X., Lv, H., Liu, L., Yu, C. (2019), "Experimental study on property change of slurry and filter cake of slurry shield under seawater intrusion", Tunnelling and Underground Space Technology, Vol. 88, pp. 290-299. https://doi.org/10.1016/j.tust.2019.03.006
  7. Park, S.S., Lee, J.W. (2012), "Effect of sea water on curing and strength of cemented sand", Journal of the Korean Geotechnical Society, Vol. 28, No. 6, pp. 71-79. https://doi.org/10.7843/KGS.2012.28.6.71
  8. Park, S.S., Nong, Z., Jeong, S.W. (2012), "Effect of sea water and microorganism on liquid and plastic limits of soils", Journal of the Korean Geotechnical Society, Vol. 28, No. 10, pp. 79-88. https://doi.org/10.7843/KGS.2012.28.10.79
  9. Roh, B.K., Koh, S.Y., Choo, S.Y. (2012), "Infiltration behaviour of the slurry into tunnel face during slurry shield tunnelling in sandy soil", Journal of Korean Tunnelling and Underground Space Association, Vol. 14, No. 3, pp. 261-275. https://doi.org/10.9711/KTAJ.2012.14.3.261
  10. Ryu, Y.M., Kim, H.M., Kim, D.H., Lee, I.M. (2019), "Effect of seawater on the applicability of a slurry shield TBM", Journal of Korean Tunnelling and Underground Space Association, Vol. 21, No. 2, pp. 243-256. https://doi.org/10.9711/KTAJ.2019.21.2.243