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为研究不同倾角的天然软弱夹层对大理岩的影响规律,分别基于0°,30°,45°,60°和90°的天然软弱夹层岩样进行单、三轴压缩试验.试验结果表明夹层对岩石的强度具有“弱化效应”:1)单轴压缩时,夹层岩样整体上表现为劈裂型破坏,但在倾斜夹层处会出现不同程度剪切滑移,产生拉剪复合型破坏.三轴压缩时,夹层岩样发生剪切破坏,其中60°夹层岩样的破裂面与夹层面完全重合.2)不同倾角的夹层对岩石的弱化作用不同,整体趋势为岩石的强度随夹层倾角的增加呈现出先减小、再增大的特点,当夹层角度为60°时,夹层对岩样的弱化效应最为显著.3)大理岩三轴压缩时沿夹层破坏的夹层倾角范围为51°~69°,理论与试验结果吻合较好.
In order to study the influence law of natural soft interlayer with different dip on marble, single and triaxial compression tests were carried out on natural soft interlayer based on 0 °, 30 °, 45 °, 60 ° and 90 °, respectively. The experimental results show that interlayer pairs The strength of the rock has a “weakening effect”: 1) In the uniaxial compression, the intercalated rock samples show splitting failure as a whole, but different degrees of shear slippage will occur at the inclined intercalations, resulting in composite shear failure In the triaxial compression, the intercalation layer rock samples are sheared and destroyed, of which the fracture surface of the 60 ° intercalation layer completely coincides with the intercalation plane.2) Intercalations with different dip angles have different weakening effects on the rock, and the general trend is that the strength of the rock varies with the intercalation When the interlayer angle is 60 °, the weakening effect of the interlayer on the rock samples is the most significant.3) The dip of the interlayer along the interlayer failure in the triaxial compression of marble is 51 ° ~ 69 °, the theoretical and experimental results agree well.