Performance Assessment of Flexible Wire Rope Rockfall Protection Fence for 100 kJ Energy Absorption

Jing-ik Son, Yong-chul Shin, Jung-woo Kim, Hyung-Bum Moon, Kyung-soo Lee

doi:10.9720/kseg.2022.4.499

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2022 Vol.32, Issue 4 Preview Page Next Page

Research Article

Performance Assessment of Flexible Wire Rope Rockfall Protection Fence for 100 kJ Energy Absorption 100 kJ 낙석에너지 흡수가 가능한 유연성 와이어로프 낙석방지울타리 성능검증

31 December 2022. pp. 499-511

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Abstract

본 연구에서는 ETAG 027에서 제시하는 수직낙하실험법을 이용하여 100 kJ 낙석에너지를 포획할 수 있는 유연성 와이어로 낙석방지울타리에 대한 성능검증을 실시하였다. 유연성 와이어로프는 스프링과 와이어로프로 구성된 탄성력 증진 로프로서 와이어로프보다 탄성늘음이 향상되어 낙석과 와이어로프와의 접촉시간을 인위적으로 증가시켜 낙석 충격력 경감효과를 유발하고 낙석에너지 흡수효과 또한 향상시켰다. 9.8 kN의 콘크리트 공시체를 낙석방지울타리 상단 10.5 m 높이에서 자유낙하시켜 102.9 kJ의 낙석에너지를 낙석방지울타리에 가한 후 지주거동을 분석한 결과, 지주는 소성비틀림이 발생하였으며 탄성회복 후 최종변형량은 1.15 m로 ETAG 027에서 제시하는 기준인 2.0 m 이하의 결과가 제시되어 유연성 와이어로프 낙석방지울타리는 102.9 kJ의 낙석에너지를 성공적으로 흡수 가능한 것으로 확인되었다.

키워드

유연성 와이어로프

낙석방지울타리

낙석

낙석에너지

낙석 충격력

In this study, a vertical drop test was carried out to identify the performance of flexible wire rope rockfall protection fence by 100 kJ rockfall energy according to ETAG 027. The flexible wire rope, which consists of wire rope and spring. is especially enhanced the elasticity and flexibility so that it can be longer elongated when the rope is impacted by rockfall compared to original wire rope, and that results longer increase of contact time between rockfall and wire rope and increase rockfall energy absorption capability and decreases rockfall impact force. The test results shows that the plastic deformation occurred in middle post and the final deflection of the middle post was 1.15 m, which is lower than 2.0 m determined by ETAG 027. This vertical test verified the flexible wire rope rockfall protection fence can successfully absorb 102.9 kJ rockfall energy.

Keywords

flexible wire rope

rockfall protection fence

rockfall

rockfall energy

rockfall impact force

References

EOTA, 2008, Guideline for European technical approval of falling protection kits, ETAG 027, European Organization for Technical Approvals.

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Kim, K.D., Ko, M.G., Kim, D.S., Moon, B.G., 2015, Performance assessment for rockfall protection systems I: Performance assessment criteria, Journal of the Korean Society of Civil Engineers, 35(1), 63-76 (in Korean with English abstract). 10.12652/Ksce.2015.35.1.0063

Koo, H.B., Park, H.J., Paik, Y.S., 2001, Characteristics and energy absorbing capacity for rockfall protection fence from in-situ rockfall tests, Journal of the Korean Geotechnical Society, 17(6), 111-121 (in Korean with English abstract).

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Information

Publisher :Korean Society of Engineering Geology
Publisher(Ko) :대한지질공학회
Journal Title :The Journal of Engineering Geology
Journal Title(Ko) :지질공학
Volume : 32
No :4
Pages :499-511
Received Date :2022. 10. 13
Revised Date :2022. 11. 15
Accepted Date : 2022. 11. 18
DOI :https://doi.org/10.9720/kseg.2022.4.499

The Journal of Engineering Geology ISSN:1226-5268(Print) 2287-7169(Online) 지질공학

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