考虑端部摩擦效应的岩石卸载强度准则

doi:10.13722/j.cnki.jrme.2018.1433

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Abstract In order to analyze the effects of end friction and confining pressure unloading rate on rock mechanical parameters，the tri-axial confining pressure unloading tests of sandstone specimens under different end friction factors and unloading rates of the confining pressure were carried out by RMT–150B rock mechanics test system.The results show that，under the same end friction factor and initial confining pressure，the greater the unloading rate of the confining pressure is，the lower the failure confining pressure and the greater the differential stress at failure are，and that，with the same confining pressure unloading rate and initial confining pressure，the greater the end friction factor is，the lower the failure confining pressure and the greater the differential stress at failure are. The friction angle ? and the cohesion c of rock specimens increase linearly with increasing the end friction factor as a whole and increase overall at a decreasing rate with rising the confining pressure unloading rate and the same end friction factor. An end-friction(E-F) unloading strength criterion of rock including the end friction factor and the unloading rate was proposed，and the fitting analysis between the peak strength and the failure confining pressure of rock specimens by the criterion was performed. It is shown that the criterion can describe the strength of rock specimens under unloading confining pressure condition. Given the value of the end friction factor K，the E-F unloading failure strength envelope of rock specimens under different confining pressure unloading rates v can be drew out and then the strength parameters of rock specimens under different confining pressure unloading rates can be obtained.

Key words： rock mechanics end friction factor unloading rate end-friction(E-F) unloading strength criterion

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	Articles by authors
	GUO Jinbao1
	GUO Baohua1
	2
	CHEN Yan1
	LUO Tao1

Cite this article:

GUO Jinbao1,GUO Baohua1,2, et al. An unloading strength criterion of rock considering end-friction effect#br#[J]. , 2019, 38(7): 1307-1318.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1433 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I7/1307

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