考虑岩石交界面方向效应的巴西劈裂试验研究

发布时间：2018-06-25 04:13

本文选题：岩石力学 + 岩石交界面　；参考：《工程科学学报》2017年09期

【摘要】：为了研究硬岩与软岩交界面方向对其破坏形式的影响,对含岩石-水泥砂浆(代替软岩)交界面的组合试样进行了多组加载角度的巴西劈裂试验,获得了不同交界面方向的组合试样的"抗拉"强度,并利用颗粒流程序PFC2D研究了交界面的破坏机理.计算得到的"抗拉"强度随交界面与加载方向夹角的增大而增大.当交界面平行于加载方向时,沿交界面发生劈裂破坏,计算得到的"抗拉"强度可认为是交界面的抗拉强度;当交界面与加载方向不平行时,发生更为复杂的拉剪复合破坏.此外,为了进一步分析交界面的抗拉强度对破坏形式的影响,采用提高水泥用量和增大交界面粗糙度两种方法增加交界面的抗拉强度,并进行了一系列试验.试验得到了含交界面的巴西劈裂试验的典型破坏模式分布图,对更好地理解硬岩与软岩交界面的破坏形式具有指导意义.
[Abstract]:In order to study the influence of the direction of interface between hard rock and soft rock on its failure form, the Brazilian splitting test with multiple loading angles was carried out on the composite sample containing the interface of rock and cement mortar (instead of soft rock). The tensile strength of the composite specimens with different interfacial directions was obtained, and the failure mechanism of the interface was studied by using the particle flow program PFC2D. The calculated tensile strength increases with the increase of the angle between the interface and the loading direction. When the interface is parallel to the loading direction, the fracture occurs along the interface. The calculated tensile strength can be regarded as the tensile strength of the interface, and when the interface is not parallel to the loading direction, A more complex tensile shear composite failure occurs. In addition, in order to further analyze the influence of the tensile strength of the interface on the failure form, two methods of increasing the cement content and increasing the roughness of the interface are adopted to increase the tensile strength of the interface, and a series of tests have been carried out. The typical failure pattern distribution of Brazilian splitting test with interface is obtained, which is of guiding significance for a better understanding of the failure mode of the interface between hard rock and soft rock.
【作者单位】：中南大学资源与安全工程学院;
【基金】：国家重点研发计划资助项目(2016YFC0600706) 中南大学中央高校基本科研业务费专项基金资助项目(2017zzts166)
【分类号】：TU45

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