Contribution ratio of excitation action triggered by collopse of perilous rock to the stability of perilous rock

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (20) : 32-37.

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Contribution ratio of excitation action triggered by collopse of perilous rock to the stability of perilous rock

TANG Hong-mei1,2 WANG Zhi2 CHEN Hong-kai1,2 XIAN Xue-fu1

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Abstract

The mechanism failure must consider the interaction of perilous rock . Study on stability of perilous rock by excitation action triggered by collopse is an important question. In this paper, Focused on the falling perilous , a physica l model was established considering falling excitation action;Analyzed the dominant fissure’s mechanic characteristics under the vertically incidence of excitation waves;Based on the fracture mechanics, a method to calculate the combined stress intensity factors of dominant fissure under falling excitation action of perilous rock was established.As the instance results showed, two cites of nature and rainfall ,the stability coefficient are both reduce ,specially in the horizontal , stability coefficient reduced by about 10% respectively ,while in vertical about 2% . The results provided some scientific progresses disasters prevention and mitigation of perilous rock.

Key words

rock mechanics / combined stress strength factor / excitation wave / perilous rock / dominant fissure

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TANG Hong-mei;WANG Zhi CHEN Hong-kai;XIAN Xue-fu. Contribution ratio of excitation action triggered by collopse of perilous rock to the stability of perilous rock[J]. Journal of Vibration and Shock, 2012, 31(20): 32-37