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http://dx.doi.org/10.14481/jkges.2011.12.3.5

A Study on Bounce Height and Impact Energy Considering Slope Height, Rockfall Weight Using Rockfall Program Considering Slope Height, Rockfall Weight  

You, Byung-Ok (한국도로공사 도로교통연구원 방재환경연구팀)
Han, Won-Jun (한국도로공사 도로교통연구원 방재환경연구팀)
Lee, Sang-Duk (아주대학교 환경건설교통공학부)
Shim, Jea-Won (한국도로공사 도로교통연구원 방재환경연구팀)
Publication Information
Journal of the Korean GEO-environmental Society / v.12, no.3, 2011 , pp. 47-54 More about this Journal
Abstract
The rockfall protection fence installed to secure safety against rockfall occurring in cut slope has been designed under the condition with 50kJ of impact energy arising when the 400kg of rock block is falling from 12.5m height. However, in falling case of bigger rock block or from higher place, it is hard to be secure of safety with existing rockfall protection fence. Using the rockfall program, safety analysis for rockfall is conducted in this paper by changing slope height, separating distance from fence, and slope angle, according to rock block sizes. In the result of analysis, when a 400kg of rock block which is designed load is fallen, the existing rockfall protection fence with 2.5m height can secure most of rock fall except some cases for the slope having 20m or less hight, whereas for more than 20m height, the fallen rock is frequently splattered over the rockfall protection fence, as well as the impact energy of rockfall may exceed designed impact energy. Therefore, in the design of rock fence, it is considered appropriate to design that after conducting safety review for rockfall according to the ground conditions, evaluating the bounce height and impact energy of rock fall, and then installing appropriate rockfall protection fence would be applicable rather than just following standards based design drawing.
Keywords
Rockfall; Rock protection fence; Bounce height; Impact energy; Rockfall weight;
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