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为研究表面裂纹对大理岩破坏特性的影响,采用室内试验的方法,获得了0°、30°、60°倾角单预制表面裂纹和45°倾角的双表面裂纹试件的单、三轴试验结果.结果表明:表面裂纹对试件中新裂纹的产生具有明显的诱导作用,但未对试件整体强度产生明显影响;围压对试件的破坏形式有决定作用:单轴压缩下,试件多表现为劈裂破坏,三轴压缩下,试件为剪切破坏;单预制表面裂纹对最终的破裂扩展路径不起决定性作用,双预制表面裂纹则对破裂断面作用明显.研究结论可以为岩土工程中裂隙岩体的失稳和破坏的预警提供参考.
In order to study the effect of surface cracks on the failure characteristics of marble, the single and triaxial test results of double cracked specimens with 0 °, 30 ° and 60 ° dip angles and 45 ° dip The results show that the surface cracks have a significant induction effect on the occurrence of new cracks in the specimens, but have no obvious effect on the overall strength of the specimens. The confining pressure has a decisive effect on the failure modes of the specimens: under uniaxial compression, And the specimens are shear failure under triaxial compression. The single prefabricated surface crack is not critical to the final crack propagation path, while the double prefabricated surface crack has obvious effect on the fracture surface.The conclusion can be that the rock Soil engineering fractured rock instability and damage early warning provide a reference.