Mechanism of Rock Burst Caused by Excavation Unloading Effect

doi:10.3969/j.issn.1001-5485.2014.11.0242014,31(11):120-124

Journal of Changjiang River Scientific Research Institute ›› 2014, Vol. 31 ›› Issue (11): 120-124.DOI: 10.3969/j.issn.1001-5485.2014.11.0242014,31(11):120-124

• STABILITY OF UNDERGROUND CAVERN SURROUNDING ROCK • Previous Articles Next Articles

Mechanism of Rock Burst Caused by Excavation Unloading Effect

WANG Yang,YIN Jian-min,LI Yong-song, ZHOU Chun-hua,AI Kai

Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China

Received:2014-08-07 Revised:2014-11-05 Published:2014-11-01 Online:2014-11-01

Abstract

Abstract: In view of the rock bursts caused by excavation unloading in the deep diversion tunnel of JinpingⅡhydropower station, we carried out numerical simulation to research the effects of unloading range and unloading degree of surrounding rock on rock burst. Research indicates that the potential power source zone of rock burst gradually transfers to the deep and the probability of rock burst is further reduced when the unloading range and unloading degree increase. Moreover, the impact of unloading degree on rock burst is more significant than that of unloading range. The research provides theoretical foundation for preventing rock burst in deep underground projects.

Key words: rock mechanics, excavation unloading, slit local stress relieving, rock burst

CLC Number:

TD313

WANG Yang,YIN Jian-min,LI Yong-song, ZHOU Chun-hua,AI Kai. Mechanism of Rock Burst Caused by Excavation Unloading Effect[J]. Journal of Changjiang River Scientific Research Institute, 2014, 31(11): 120-124.

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Mechanism of Rock Burst Caused by Excavation Unloading Effect

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