端部效应对岩石真三轴压缩强度的影响

doi:10.13722/j.cnki.jrme.2015.0054

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摘要真三轴强度准则已提出很多，而真三轴试验结果却很少，且可靠性需要确认。如茂木清夫所做Orikabe 二长岩和Yamaguchi大理岩，在真三轴应力下的强度及变形较为特别：中间主应力2恒定时强度不随最小主应力3增加而增加，在延性变形阶段2对强度的影响大于3。拉西瓦花岗岩强度也存在类似的奇异。合理的解释是，在3较高时试样轴向变形较大，引起加载2压板产生摩擦而提高强度。修正摩擦效应意味着增大3而减小1，2对强度的真实影响将不再随3显著增加。

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	尤明庆

关键词 ：岩石力学, 真三轴强度, 试验数据, 强度准则, 摩擦效应

Abstract：Many true triaxial strength criteria for rock have been proposed；however，the true triaxial test data for evaluating the criteria are rare and also needed to verify. Strengths and deformation of Yamaguchi marble and Orikabe monzonite tested by Kiyoo Mogi exhibit strange phenomena：strength does not increase after an increase of 3 while 2 keeps a constant；2 has larger influence than 3 on the bearing capacity in ductile deformation. The abnormal strength property of Laxiwa granite is also discussed. A reasonable conclusion is that specimens compressed under high 3 are endured large axial deformation which may induce significant end effects from platens in 2-direction. The genuine effect of 2 on strength does not enhance with 3 after friction correction.

Key words： rock mechanics true triaxial strength test data strength criterion friction effect

引用本文:

尤明庆. 端部效应对岩石真三轴压缩强度的影响[J]. 岩石力学与工程学报, 2016, 35(S1): 2603-2607.
YOU Mingqing. End effects on strengths of rocks under true triaxial compression. , 2016, 35(S1): 2603-2607.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0054 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS1/2603

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