考虑中间主应力的原位岩体强度参数取值研究

doi:10.13722/j.cnki.jrme.2014.1628

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Abstract In order to research the strength characteristics of the surrounding rocks in deep tunnels and underground powerhouses，two series of in-situ true triaxial tests for basalt and schist rock masses were carried out. Then，based on Mohr-Coulomb and Mogi criteria，evaluation of strengthen parameters considering the intermediate principal stress was discussed. The research indicated that，according to the strength values of basalt and schist rock masses obtained by in-situ true triaxial tests，the Mohr-Coulomb criterion regression equations passed the F-test at a significance level of 0.05，however，the Mogi criterion regression equations passed the F-test at a higher significance level of 0.01. Therefore，using Mogi criterion may be better to analyze the in-situ true triaxial tests data. The values of strength parameter calculated by Mogi criterion considering the intermediate principal stress were higher 6% than the values calculated by Mohr-Coulomb criterion ignoring the effect of the intermediate principal stress. But，the values of strength parameter c calculated by Mogi criterion were lower 60% than the values calculated by Mohr-Coulomb criterion.

Key words： rock mechanics rock mass in-situ true triaxial test intermediate principal stress Mogi criterion strength parameters

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	Articles by authors
	FAN Lei
	HUANG Zhengjia
	ZHOU Huoming
	ZHANG Yihu
	LI Weishu

Cite this article:

FAN Lei,HUANG Zhengjia,ZHOU Huoming, et al. Study on strength parameters of in-situ rock mass considering intermidiate principal stress[J]. , 2016, 35(S1): 2682-2686.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1628 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/2682

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