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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摘要为分析端部摩擦对岩石力学参数的影响，采用RMT–150B岩石力学试验系统对砂岩试样进行不同端部摩擦因子和围压卸载速率下的三轴卸围压试验。结果表明：在相同端部摩擦因子和初始围压下，围压卸载速率越大，试样破坏围压越低，试样破坏差应力越大；在相同围压卸载速率和初始围压下，端部摩擦因子越大，试样破坏围压越低，试样破坏差应力也越大；在相同围压卸载速率下，试样内摩擦角?和黏聚力c值整体上随端部摩擦因子增加近似直线增加；在相同端部摩擦因子下，试样内摩擦角?和黏聚力c值整体上随围压卸载速率增大而增大，但增加速率逐渐降低。提出包含端部摩擦因子和围压卸载速率的end-friction(E-F)卸载强度准则，通过采用该准则对试样峰值强度和破坏围压的关系进行拟合分析，认为该准则能够较好地描述三轴卸围压破坏试样强度。若已知端部摩擦因子K值，可得到不同围压卸载速率v下岩石E-F卸载破坏强度包络线，进而获得不同围压卸载速率下岩石材料强度参数。

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	郭金宝1
	郭保华1
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	陈岩1
	骆韬1

关键词 ：岩石力学, 端部摩擦因子, 卸载速率, end-friction(E-F)卸载强度准则

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

引用本文:

郭金宝1，郭保华1，2，陈岩1，骆韬1. 考虑端部摩擦效应的岩石卸载强度准则[J]. 岩石力学与工程学报, 2019, 38(7): 1307-1318.
GUO Jinbao1，GUO Baohua1，2，CHEN Yan1，LUO Tao1. An unloading strength criterion of rock considering end-friction effect#br#. , 2019, 38(7): 1307-1318.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1433 或 http://www.rockmech.org/CN/Y2019/V38/I7/1307

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