摘要：The crack propagation in concrete materials pose a great threat to the environmental facilities.In view of the lack of research on the interaction between two holes,RFPA software is used to simulate the crack propagation process,acoustic emission law and peak intensity change under different heterogeneity coefficients and different azimuth angles of two holes.The results show that: (1) the cracks first occur at the upper and lower ends of the orifice,and then the far-field cracks occur; (2) when the heterogeneity coefficient is small,the specimen presents a typical shear failure mode,and when the non-mean coefficient is large,the specimen presents a typical tensile failure mode; (3) the crack propagation at different azimuth angles shows three modes: tensile failure,shear failure and tension-shear failure; (4) Acoustic emission diagram.The upper and lower end of the hole first produces a pull crack (that is,a red circle in the picture),and a shear crack occurs at the side of the hole and at the junction of the hole (that is,a white circle in the diagram).After the shear crack is produced,the pull crack is then produced.The acoustic emission law is highly consistent with the crack propagation law; (5) the greater the azimuth angle,the greater the peak strength of the specimen; The larger the non-mean coefficient,the higher the peak strength of the specimen.The influence of the azimuth of the double-hole specimen on the peak strength is greater than that of the non-mean coefficient on the peak strength of the specimen.The results provide a reference for understanding the law of crack growth of two-hole specimens and the construction of environmental facilities.
