Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on Sub-base Composition Effect of Forest Road Using Geosynthetics for Passage of Large Logging Trucks

대형 목재운송차량 통행에 적합한 토목섬유 활용 임도 노반조성 효과분석

  • Hwang, Jin-seong (Forest Technology and Management Research Center, National Institute of Forest Science) ;
  • Ji, Byoung-yun (Forest Technology and Management Research Center, National Institute of Forest Science) ;
  • Kweon, Hyeong-keun (Department of Forest Environment & Resources, Chungnam National University) ;
  • Lee, Kwan-hee (Forest Technology and Management Research Center, National Institute of Forest Science)
  • 황진성 (국립산림과학원 산림기술경영연구소) ;
  • 지병윤 (국립산림과학원 산림기술경영연구소) ;
  • 권형근 (충남대학교 산림환경자원학과) ;
  • 이관희 (국립산림과학원 산림기술경영연구소)
  • Received : 2018.05.03
  • Accepted : 2018.09.07
  • Published : 2018.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

This study was carried out to provide surface bearing capacity reinforcement of forest road by sub-base facilities based on a soft ground use of geosynthetics to prevent the damage of the road surface passing heavy logging trucks and to pass smoothly heavy truck against growing timber harvesting. The analysis of the road surface bearing capacity as progressing time and the increase of the number of passage of heavy logging trucks were conducted experimental section of forest road on the soft ground in the Forest Technology and Management Research Center. As a result, it was found that the road surface bearing capacity were stabilized at CBR of 15% or more, the effect of reinforcement by type of geosynthetics showed no significant difference after the lapse of about 1 year. After reaching the passage of 300 times for the heavy logging trucks on the sub-base construction section, the settlements was stabilized below the allowable standard of 50 mm, road surface bearing capacity also improved to more than CBR 20% and there was no significant difference in the thickness of the sub-base. However, in the section where the sub-base is not constructed, it is found that the lack of surface bearing capacity with the settlements more than the allowable standard is not possible to pass the heavy logging trucks. Therefore, in order to reinforce the road surface bearing capacity of the soft ground for the passage of the heavy logging trucks, it is necessary to construct a sub-base of at least 0.2 m when using geosynthetics.

본 연구는 본격적인 목재수확시기에 대응하여 대형화되어 가는 목재운송차량의 원활한 통행과 노체 피해 방지를 위해 산림기술경영연구소 관내 연약지반을 대상으로 토목섬유를 활용한 노반 조성 후 시간경과에 따른 노면지지력 변화와 대형 목재운송차량의 통행 횟수 증가에 따른 노면지지력 및 침하량 변화를 분석하였다. 그 결과, 노반 조성구간의 경우 약 1년의 시간경과 후 노면지지력이 양호판정기준인 CBR 15% 이상으로 안정화 되어 가는 것으로 나타났으며, 토목섬유별 처리효과는 큰 차이를 보이지 않는 것으로 나타났다. 또한 노반 조성구간에서 대형 목재운송차량의 통행이 최대 300회 이루어진 이후에는 침하량이 허용기준 50 mm 이하로 안정되고, 노면지지력 또한 CBR 20% 이상으로 향상되는 것으로 나타났으며 노반의 두께별로는 큰 차이를 보이지 않았다. 그러나 토목섬유를 활용한 노반을 조성하지 않은 구간에서는 허용기준 이상의 침하와 함께 노면의 지지력은 대형 목재운송차량의 통행이 불가능한 것으로 나타났다. 따라서 대형목재운송차량의 통행을 위한 연약지반의 노면지지력 보강을 위해서는 토목섬유를 부설하고 노반을 최소 0.2 m 이상 조성하는 것이 필요하다.

Keywords

References

  1. Al-Qadi, I.L., Brandon, T.L., Valentine, R.J. and Smith, T.E. 1994. Laboratory evaluation of geosynthetic reinforced pavement sections. Transportation Research Board., No. 1439, 73rd Annual meeting, Washington DC, pp. 25-31.
  2. Arnold, G. and Graddum, G. 1995. Corduroy for Forest Roads. Logging Industry Research Organisation Report 20(4): 1-12.
  3. COFORD (National Council for Forest Research & Develpment). 2004. Forest Road Manual, Guidelines for the design construction and management of forest roads. pp. 170.
  4. DTTAS (Department of Transport, Tourism and Sport). 2014. Guidelines on the Depth of Overlay to be used on Rural Regional and Local Roads. pp. 16.
  5. Fairbrother, S. 2011. Estimating Forest Road Aggregate Strength by Measuring Fundamental Aggregate Properties in proceedings Council for Forest Engineering, Quebec City. pp. 1-9.
  6. Fannin, R. J. and Sigurdsson, O. 1996. Field observation on stabilization of unpaved roads with geosynthetics. Journal of Geotechnical Engineering 122(7): 544-553. https://doi.org/10.1061/(ASCE)0733-9410(1996)122:7(544)
  7. FESA (Forest Engineering Southern Africa). 2012. South Africa Forest Road Handbook. pp. 47-51.
  8. Giroud, J.P. and Han, J. 2004. "Design Method for Geogrid- Reinforced Unpaved Roads. Parts I and II.". Journal of Geotechnical and Geoenvironmental Engineering 130(8): 775-797. https://doi.org/10.1061/(ASCE)1090-0241(2004)130:8(775)
  9. Hufenus, R., Rueegger, R., Banjac, R., Mayor, P., Springman, S.M. and Bronnimann, R. 2006. Full-Scale Field Tests on Geosynthetic Reinforced Unpaved Roads on Soft Subgrade. Geotextiles and Geomembranes 24(1): 21-37. https://doi.org/10.1016/j.geotexmem.2005.06.002
  10. Koerner, R.M. and G.R. Koerner. 1994. Separation: Perhaps the most underestimated geotextile function. Geotechnical Fabrics Report, Industrial Fabrics Association International, St. Paul, pp. 4-10.
  11. KFS (Korea Forest Service). 2017. Statistical yearbook of forestry. pp. 441.
  12. Korea Forestry Promotion Institute. 2017. The querterly market prices of domestic timber. pp. 104.
  13. Latha G.M., Nair, A.M. and Hemalatha, M. S. 2010. Performance of geosynthetics in unpaved roads. International Journal of Geotechnical Engineering 4: 337-349. https://doi.org/10.3328/IJGE.2010.04.03.337-349
  14. Leng, J. 2002. Characteristics and Behavior of Geogrid- Reinforced Aggregate Under Cyclic Load. PhD Thesis. North Carolina State University. p. 164.
  15. MAFRA (Ministry of Agriculture, Food and Rural Affairs). 1997. Development of Roller-Compacted Concrete Pavement for Construction of Agricultural Roads. pp. 125.
  16. Maxwell, S., Kim, W.H., Edil, T.B. and Benson, C.H. 2005. Effectiveness of Geosynthetics in Stabilizing Soft Subgrades. Wisconsin Highway Research Program, Final Report No. 0092-45-15, p. 88.
  17. NIFOS (National Institute of Forest Sicence). 2017. Study on Systematic Network and Optimal Structure of Fores Road for Forest Production Infrastructure. pp. 89.
  18. Visser, R., Brown, K. and Tinnelly, B. 2017. Geogrid for unsealed forest roads: installation considerations and bearing capacity testing in New Zealand. International Journal of Forest Engineering 28(2): 106-115. https://doi.org/10.1080/14942119.2017.1317132
  19. Sprague, C.J. and Cicoff, G.A. 1993. A Study of the Cost- Effectiveness of Using Geotextiles in Permanent Road Structures. Geosynthetics '93, Vancouver, Canada, pp. 49-63.
  20. USACE (U.S. Army Corps of Engineers). 2003. ETL-1110-1-189 Use of Geogrids in Pavement Construction. pp. 7-18.
  21. USFS (United States Forest Service). 1996. Earth and aggregate surfacing design guide for low volume roads. pp. 302.
  22. Yang, S.H. 2006. Effect of using Geotextiles in Flexible Pavements: Life-cycle Cost Analysis. MS thesis, the Virginia Polytechnic Institute and State University. pp. 99.
  23. Zornberg, J.G. 2012. Geosynthetic-reinforced Pavement Systems. Keynote paper, Fifth European Geosynthetics Conference, EuroGeo5, 16-19 September, Valencia, Spain, Keynote Lectures Volume. pp. 49-61.