双轴加载下断续预置裂纹贯通机制的研究*

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Abstract The mechanism of the fracture coalescence between three flaws is studied using rock-like modelling material under confining pressure condition. The specimens contain three pre-existing flaws with different geometry distribution and different confining condition. Experimental and numerical results show that the mechanisms of crack coalescence is controlled by the geometric setting of the flaws and the confining pressure. Under the confining condition，there are four modes of coalescence between the rock bridge：tensile mode，shear mode，compression mode and mix mode(shear and tensile). The growth of tensile crack slows down with the increasing of confining pressure. Compressive crack is active when the flaws are overlapping and with a distance between two flaws 1＜b/c＜2. Under the confining pressure，the opening of flaws becomes more close，and leads to increase the friction between flaws. It also causes the growth of crack more close to the axial direction.

Key words： non-persistent pre-existing flaw crack coalescence coalescence mode types of initiated crack

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https://rockmech.whrsm.ac.cn/EN/Y2002/V21/I06/808

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