功效系数法在隧道围岩失稳风险预警中的应用

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Abstract In order to judge the dangerous situation of tunnel surrounding rock accurately，corresponding engineering measures can be performed duly to prevent the instability disaster of tunnel surrounding rock. The efficacy coefficient method is used to evaluate the stability of surrounding rock and execute instability risk early-warning of tunnel surrounding rock. Uniaxial saturated compressive strength，rock quality designation，integrity coefficient of rock mass，strength coefficient of structural plane，groundwater index and the angle between tunnel axis and main structural plane are selected as evaluation indices. The weight coefficients of evaluation indices are determined by expert evaluation method，and the early-warning model of instability risk of tunnel surrounding rock is established. The dangerous situation of surrounding rock is divided into five warning limits，i.e. huge warning，serious warning，medium warning，light warning and no warning. Then，the early-warning model of tunnel surrounding rock is applied to Xihualing tunnel of Zhuji—Yongjia highway in Zhejiang Province. The results show that the efficacy coefficient method conforms to reality and is implemented easily when it is applied to the forecast of the instability risk early-warning of tunnel surrounding rock. This new method can be used to perform stability evaluation and instability risk early-warning of tunnel surrounding rock，which has high engineering application values.

Key words： tunnelling engineering tunnel surrounding rock instability efficacy coefficient method early- warning normalized weight coefficients

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	Articles by authors
	WANG Yingchao1
	2
	3
	SUN Hongyue1
	SHANG Yuequan1
	ZHANG Yun1

Cite this article:

WANG Yingchao1,2,3, et al. APPLICATION OF EFFICACY COEFFICIENT METHOD TO INSTABILITY RISK EARLY-WARNING OF TUNNEL SURROUNDING ROCK[J]. , 2010, 29(S2): 3679-3684.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/3679

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