Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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A Numerical study on the Moisture Transport of Concrete Tunnel Linings with the Sprayable Waterproofing Membrane

뿜칠 방수 멤브레인이 시공된 터널 라이닝의 수분이동에 관한 수치해석 연구

  • Received : 2016.06.17
  • Accepted : 2016.06.24
  • Published : 2016.06.30
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Abstract

The sprayable waterproofing membrane is installed between shotcrete to provide crack bridging and hence prevent flow of liquid water as a waterproofing system. Because of its material characteristics, the sprayable membrane can be constructed at more complex structure than sheet membrane. The main component of the sprayable waterproofing membrane is a polymer-based material, therefore, moisture can migrate through sprayable waterproofing membrane materials by capillary and vapor diffusion mechanisms. The moisture transport mechanisms can have an influence on the degree of saturation and may influence the pore pressure and risk of freeze-thaw damage on concrete linings and membrane. In this study, long-term hygrothermal behavior was simulated with considering moisture transport and long-term effects on saturation of tunnel linings. From the simulation, due to water absorption and vapor transport properties of sprayable membrane, change of relative humidity and water content in tunnel lining can be evaluated.

뿜칠 방수 멤브레인은 숏크리트 사이에 시공되어 라이닝 크랙을 통한 누수를 방지하는 목적으로 최근 유럽 국가를 중심으로 시공 사례가 늘어가고 있다. 뿜칠 방수 멤브레인은 방수 시트에 비해 복잡한 단면에도 시공이 용이하기 때문에 이용 사례가 늘어갈 것으로 전망된다. 뿜칠 방수 멤브레인은 폴리머로 구성된 재료로서 투수성이 매우 낮지만 수분의 이동에 의해 포화가 되고 이로인해 콘크리트 재료에 간극수압이나 동결 문제를 일으킬 수 있는 우려가 있다. 본 연구에서는 뿜칠 방수 멤브레인의 수분이동과 계절변화를 고려하여 숏크리트 라이닝의 열-습도 전달 장기 해석을 수행하였다. 해석을 통해 뿜칠 방수 멤브레인의 수분 흡수 작용과 수분 이동으로 인한 상대습도 변화를 고찰할 수 있었으며 이로 인한 장기적 변화를 모사할 수 있었다.

Keywords

References

  1. Gomes, A.R.A., 2005, Waterproofing and drainage systems for transport tunnels-a review of current practices. Felsbau 3:46-49
  2. Holter K.G., 2016, Performance of EVA based sprayed membranes in hard rock, Rock Mech Rock Eng, Vol. 49(4), pp. 1329-1358. https://doi.org/10.1007/s00603-015-0844-5
  3. Holter, K.G. and S. Geving, 2016, Moisture Transport Through Sprayed Concrete Tunnel Lining, Rock Mech Rock Eng, Vol.49(1), pp. 243-272. https://doi.org/10.1007/s00603-015-0730-1
  4. Holter, K.G., 2015, Properties of waterproof sprayed concrete tunnel lining, Doctoral theses, Norwegian University of Science and Technology, Norway.
  5. Holter, K.G., H. Buvik, B. Nermoen, B., Nilsen, 2013, Future trends for tunnel lining design for modern rail and road tunnels in hard rock and cold climate. In: Anagnostou G, Ehrbar H (eds) Proc. ITAAITES World Tunnel Congress Geneva 2013-underground the way to the future
  6. International Tunnelling Association (ITA/AITES), 2013, ITAtech Report No 2. Design Guidance for Spray Applied Waterproofing Membranes. International Tunnelling Association
  7. Kunzel, H.M., 1995, Simultaneous heat and moisture transport in building components. One-and two-dimensional calculation using simple parameters. Fraunhofer IRB Verlag, Stuttgart.
  8. Lee, C., 2012, Performance of Ground Heat Exchangers for Civil Infrastructures, Ph.D. Thesis, Korea university, Seoul, South Korea.
  9. Lee, C., K. Lee, H. Choi, H-P. Choi, 2010, Characteristics of thermally-enhanced bentonite grouts for geothermal heat exchanger in South Korea, Science in China Series E: Technological Sciences, Vol. 53(1), pp. 123-128. https://doi.org/10.1007/s11431-009-0413-9
  10. Lemke, S., 2014, A blessing or Pandora's box-spray applied membranes: an objective review. In: Proceedings of the seventh international symposium on sprayed concrete, Sandefjord. Tekna/Norwegian Concrete Association, Oslo.
  11. Maidl, B, 2013, Handbook of tunnel engineering I, structures and methods. Wilhelm Ernst & Sohn, Berlin.
  12. SINTEF, 2011, Testing of sprayed concrete. Determination of water penetration, air pores and frost resistance. Report no. 3D0059.21, SINTEF, Trondheim
  13. Slanina P. and S. Silarova, 2009, Moisture transport through perforated vapour retarders, Building and Environment, Vol. 44(8), pp. 1617-1626. https://doi.org/10.1016/j.buildenv.2008.10.006
  14. WTA 6-2-0, 2004, Simulation of heat and moisture transfer, WTA Publicatons, Munchen, Germany, p. 16.
  15. WUFI, 2014, http://www.wufi.de/index_e.html