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

  • 제19권3호
  • /
  • Pages.463-473
  • /
  • 2017
  • /
  • 2233-8292(pISSN)
  • /
  • 2287-4747(eISSN)
한국터널지하공간학회 (Korean Tunnelling and Underground Space Association)
권호 표지
DOI QR코드

DOI QR Code

해수의 영향에 따른 이수식 TBM의 슬러리 관리를 위한 기초적 연구

A fundamental study of slurry management for slurry shield TBM by sea water influence

  • 투고 : 2017.04.14
  • 심사 : 2017.05.16
  • 발행 : 2017.05.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

벤토나이트는 물과 접촉하면 팽창하고 점성을 발휘하는 성질이 있어 일반적으로 차수가 필요한 토목공사에 많이 활용되고 있다. 이수식 TBM에서는 이와 같은 성질을 활용하여 가압된 슬러리로 불투수성 막을 형성하고 굴착벽면의 붕괴를 방지하는 동시에 굴착된 버력을 운송하며 굴착을 수행한다. 하지만 벤토나이트는 해수와 접촉할 경우 팽창성이 저하되어 그 성질을 발휘하지 못하는 문제가 있다. 이는 해수 조건에서 이수식 TBM으로 터널을 굴착할 시 지하수 유입 증가로 인한 굴착 안정성 및 버력 배출에 문제를 초래할 수 있다. 본 연구에서는 이수식 TBM으로 터널을 굴착 시 해수의 유입으로 인한 슬러리의 상태변화를 살펴보고 이에 대응하기 위한 슬러리 관리방안을 제시 하였다. 이를 위해 현장에서 적용된 슬러리 품질관리 기준을 바탕으로 실내 시험을 수행하였으며, 해수의 영향이 있는 현장에 적용 할 수 있는 방안을 제시하였다.

Bentonite swells when it comes into contact with water and makes it a viscous fluid. Thus it is widely used in civil engineering works for waterproofing. Utilizing the properties of bentonite, the slurry shield TBM supports excavated face with pressurized slurry as well as transporting excavated muck. When bentonite is in contact with seawater, due to the change of double layer thickness, its expandability and viscosity are lowered. This may cause problems for excavation stability and muck discharge due to the increase of sea water inflow when Slurry TBM is used under sea water conditions. In this study, the change of slurry condition caused by the inflow of sea water during tunnel excavation with Slurry TBM was investigated and a slurry management guideline was proposed. For this purpose, a laboratory test was carried out based on the slurry management criterions applied in the field, and a method applicable to the field where sea water is affected has been proposed.

키워드

참고문헌

  1. 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 geosynthetios society, Vol. 1, No. 1, pp. 43-51.
  2. 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
  3. Kim, Y.B., Kim, S.R., Kwak, K.S., Oh, S.G. (2004), "A study on development type bentonite mate waterproofing materials under the influence of salt water", The Korea Institute of Building Construction, Vol. 4, No. 2, pp. 45-49.
  4. Oh, S.K., Yoo, J.K., Bae, K.S. (2002), "A study on the swelling property and watertightness evaluation of bentonite mat for waterproofing", Journal of the architectural institute of Korea structure & construction, Vol. 18, No. 4, pp. 91-96.
  5. 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
  6. 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
  7. Park, H.K., Oh, J.Y., Chang, S.B., Lee, S.B. (2016), "Case study of volume loss estimation during slurry tbm tunnelling in weathered zone of granite rock", Journal of Korean Tunnelling and Underground Space Association, Vol. 18, No. 1, pp. 61-74. https://doi.org/10.9711/KTAJ.2016.18.1.061
  8. 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
  9. Shin, H.J., Kim, S.S., Kang, M.S., Han, S.J. (1995), "The influence of bentonite slurry on thixotropic properties", Journal of the Korean society of civil engineers, Vol. 3, pp. 555-558.
  10. Yoo, C.S., Choi, J.H., Han, Y.S. (2015), "Experimental study on the effect of drilling fluid with different mix design for bore hole collaps prevention", Journal of the Korean geotechnical society, Vol. 31, No. 1, pp. 15-24. https://doi.org/10.7843/KGS.2015.31.1.15
  11. You, K.H., Park, C.M. (2016), "A study on the risk and settlement evaluation of a shield TBM excavated in soft marine sedimentary soils", Journal of Korean Tunnelling and Underground Space Association, Vol. 18, No. 4, pp. 355-364. https://doi.org/10.9711/KTAJ.2016.18.4.355
  12. Arasan, S., Yetimoglu, T. (2008), "Effect of inorganic salt solutions on the consistency limits of two clays", Turkish Journal of Engineering and Environmental Sciences, Vol. 32, pp.107-115.
  13. Di Maio, C., Santoli, L., Schiavone, P. (2004), "Volume change behavior of clays: the influence of mineral composition, pore fluid composition and stress state", Mechanics of Materials, Vol. 36, pp. 435-451. https://doi.org/10.1016/S0167-6636(03)00070-X
  14. Rao, S.M., Sridharan, A., Chandrakaran, S. (1993), "Consistency limits behavior of bentonites exposed to seawater", Marine Georesources and Geotechnology, Vol. 11, pp. 213-227. https://doi.org/10.1080/10641199309379919
  15. Sridharan, A. (1991), "Engineering behavior of fine-grained soils: a fundamental approach", Indian Geotechnical Journal, Vol. 21, pp. 1-136.
  16. Yukselen-Aksoy, Y., Kaya, A., Oren, A.H. (2008), "Seawater effect on consistency limits and compressibility characteristics of clays", Engineering Geology, Vol. 102, pp. 54-61. https://doi.org/10.1016/j.enggeo.2008.07.005