The author studies the influence exerted by the boundary conditions and diameter of a circular hole on tensile fracture initiation in brittle and quasi-brittle geomaterials subjected to nonuniform compression with regard to the size effect. The calculation of the critical stress uses the modified nonlocal and gradient fracture criteria. The calculation results are compared with the experimental data. The developed criteria allow taking into account the size effect when the size of the stress concentration zone is varied by changing both geometry and boundary conditions of the stress raiser.

中文翻译：

---

圆孔土工材料非均匀压缩的脆性和准脆性断裂

作者研究了边界条件和圆孔直径对脆性和准脆性地质材料在尺寸效应下受到非均匀压缩的拉伸断裂的影响。临界应力的计算使用修改后的非局部和梯度断裂标准。计算结果与实验数据进行了比较。当应力集中区的尺寸通过改变应力集中区的几何形状和边界条件而变化时，所开发的标准允许考虑尺寸效应。