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应用边界元法分析了不规则岩板受双点荷载的应力分布特征。结果表明:除岩板边界部分外,不同形状岩板内主应力场的分布及沿试件荷载轴上的应力值均无显著差异。鉴于劈裂破坏是沿作用力线进行的,因此在测试中用不规则试件代替规则试件是可行的,但分析亦表明:为了减少宽高比对应力分布的影响,试验时应尽量挑选宽高比近似等于1的不规则形岩块。
Boundary element method was used to analyze the stress distribution characteristics of irregular rock slab subjected to two-point load. The results show that there is no significant difference in the distribution of the principal stress field and the stress value along the load axis of the test piece, except for the boundary part of the rock plate. In view of the splitting failure along the line of force, it is feasible to use irregular specimens instead of regular specimens in the test, but the analysis also shows that in order to reduce the influence of the aspect ratio on the stress distribution, the test should be selected as much as possible. An irregularly shaped rock mass with an aspect ratio approximately equal to one.