An experimental study on the improvement of tunnel drainage system using a geogrid composite

Jun S. Lee; Il-yoon Choi; Jihoon Lim; Suk Chul Yoon

doi:10.9711/KTAJ.2016.18.1.031

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An experimental study on the improvement of tunnel drainage system using a geogrid composite 지오그리드 복합 배수재를 이용한 터널 배수성능 개선에 관한 실험적 연구

31 January 2016. pp. 31-40

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Abstract

A new testing equipment is designed to investigate the characteristics of the drainage fabric which is used in the tunnel drain system. The equipment is possible to model the loading as well as boundary conditions of the shotcrete precisely and it follows the general guideline of ASTM D4716 so that the interface between shotcrete and concrete lining retains the real situation in the tunnel site. Using the real loading conditions and surface irregularities, the flow rate and its capacity of the regular fabric has been estimated. A composite drainage fabric having geogrid inside was also used to investigate the flow rate and its efficiency. The advantages of the composite fabric compared with the regular one have been demonstrated using the experimental data and brief outline of the future work is finally proposed.

Keywords

Drainage system

Geogrid

Permeability

Roughness

Flow rate

본 연구에서는 철도터널의 배수재로 사용되는 부직포의 배수 특성을 정밀하게 조사하기 위하여 실제 터널 시공현장과 유사한 경계조건 및 하중조합을 가진 실험장비를 고안하였다. ASTM D4716과 유사한 성능을 갖는 실험장비는 숏크리트 및 방･배수재와 콘크리트 경계면의 굴곡을 현장 조건과 유사하게 구현할 수 있으며 관련 시방조건 만족유무에 따른 실험결과로부터 일반 배수재의 성능을 규명하였다. 또한 배수성능 개선을 위하여 부직포 사이에 지오그리드를 삽입한 혼합형 배수재를 사용한 경우와 일반 배수재에 대한 실험결과로부터 혼합형 배수재의 배수성능 및 적용방안에 대하여 고찰하였다.

키워드

배수체계

지오그리드

투수계수

표면 거칠기

투수량

References

1.ASTM (2013), D 4716-08 : Standard test method for determining the (in-plane) flow rate per unit width and hydraulic transmissivity of a geosynthetic using a constant head.

2.Barton, N., Choubey, V. (1977), The shear strength of rock joints in theory and practice, Rock Mech., Vol. 10, pp. 1-54.

3.Holter, K.G. (2014), Loads on sprayed waterproof tunnel linings in jointed hard rock : A study based on Norwegian cases, Rock Mech. Rock Eng., Vol. 47, pp. 1003-1020.

4.Jang, Y.-S., Kim, B., Lee, J.-W. (2015), Evaluation of discharge capacity of geosynthetic drains for potential use in tunnels, Geotextiles & Geomembranes, Vol. 43, pp. 228-239.

5.Korea expressway Corporation (2012), Expressway Construction Guide Specification.

6.Korea Rail Network Authority (2013a), Drainage and Waterproofing, KR C-12060, KR Code.

7.Korea Rail Network Authority (2013b), Railway Construction Guide Specification.

8.Korean Standards Association (2002), KS K ISO: 12958 Geotextiles and geotextile-related products: Determination of water flow capacity in their plane.

9.Murillo, C.A., Shin, J.H., Kim, K.H., Colmenares, J.E. (2014), Performance tests of geotextile permeability for tunnel drainage systems, KSCE, Vol. 18, No. 3, pp. 827-830.

10.Palmeira, E.M., Gardoni, M.G. (2002), Drainage and filtration properties of non-woven geotextiles under confinement using different experimental techniques, Geotextiles & Geomembranes, Vol. 20, pp. 97-115.

Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 18
No :1
Pages :31-40
Received Date : 2015-11-23
Revised Date : 2015-12-17
Accepted Date : 2015-12-28
DOI :https://doi.org/10.9711/KTAJ.2016.18.1.031

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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