大理岩穿晶裂纹起裂机制

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Abstract The mechanism of microcrack nucleation is one of the fundamental issues in rock mechanics，and different rocks can exhibit different mechanisms. In this study，transgranular crack nucleation in three kinds of marbles from Fangshan，Chenzhou and Hezhou are observed under microscope after compression experiment. Observation identifies 8 types of transgranular crack nucleation mechanisms，among which the mechanisms of concave boundary，cleavage damage and modulus mismatch operate in all three kinds of marbles. The mechanisms of intersection of twins，twin slip in-grain or in the adjacent grain，operate only in Hezhou marble，the mechanism of cleavage slip only exists in Chenzhou marble，and the mechanism of boundary slid operates in both Fangshan and Hezhou marbles. Further discussion shows that dense grain arrangement，flat grain boundary and weak intergranular cementation are favorable to the mechanisms of concave boundary and boundary slip. Transgranular crack nucleation mechanisms related to twin，i.e.，grain yield，twin intersection，twin slip in-grain or in the adjacent grain，mainly occur in calcite. It is common for all kinds of rocks to produce transgranular cracks due to crack along the cleavage，but only exists in mica to produce transgranular cracks due to cleavage slip. The above conclusions not only show the similarities and differences of transgranular crack nucleation in different marbles，but also explain the dominant factors of various cracking mechanisms，which is helpful to predict the formation mode of rock microcracks.

Key words： rock mechanics marble transgranular crack nucleation mechanism twin cleavage

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	Articles by authors
	CHENG Yi1
	CHEN Xianhui2
	WANG Shuang3
	XIAO Shujun4

Cite this article:

CHENG Yi1,CHEN Xianhui2,WANG Shuang3, et al. Nucleation of transgranular crack in marble[J]. , 2025, 44(2): 303-315.

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https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I2/303

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