压剪荷载下含单一裂隙砂岩的应变演化与破坏特征研究

doi:10.13722/j.cnki.jrme.2022.0742

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Abstract To study the effect of flaw inclination angle on strain evolution and failure behavior of flawed rocks，a set of compressive-shear tests were conducted with red sandstones containing a single pre-existing flaw. The full-field strain evolution of flawed specimen was monitored，recorded and analyzed using digital image correlation (DIC) technique，a criterion was proposed to determine initiation position of wing crack under compressive-shear loading，and the fractography of rock fractures were examined using scanning electron microscope(SEM). The results show that the degree of deterioration of the peak compression-shear force on the specimen by pre-existing flaw depends on its flaw inclination angle，and the strain evolution processes of the flawed-specimens can be divided into four typical stages，including compaction stage，quasi-elastic stage，crack propagation and coalescence stage，and the post-peak stage. Based on the crack initiation locations，five typical strain concentration zones were summarized，including strain bands of wing crack，anti-wing crack，secondary crack，normal and tangential edge cracks，respectively. The DIC analysis of strain evolution at several key points of some typical specimens shows that the initiation and propagation of cracks were dominated by a mixed tension-shearing effect. A novel crack dominate parameter(CDP) was proposed to quantify the degree of tension and shearing effects on crack initiation mechanism. The results show that with increase of flaw inclination angle，the shearing effect on crack initiation mechanism of the anti-wing crack gradually decreases，while its effect on secondary crack increases. When the flaw inclination angle over 30°，the mixed tension-shearing effect gradually dominates the initiation mechanism of wing cracks. Based on circular maximum theory，a theoretical criterion was proposed to determine the initiation position of wing cracks under compressive-shear loading，and the theoretical predictions agree well with the experimental results. The SEM analysis of some typical fracture surfaces shows that the fractography of wing cracks changed from rough to relatively smooth when the flaw inclination angle increased from 0° to 30°，indicating enhancement of the tensile extent，while the fractography of anti-wing cracks，secondary cracks and edge cracks were presented in layered，parallel and strip forms，respectively. The findings of this study could facilitate understanding of cracking behavior of fractured rock mass subjected to compressive-shear loading.

Key words： rock mechanics compressive-shear loading strain evolution initiation mechanism digital image correlation(DIC) technique crack dominate parameter(CDP)

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	Articles by authors
	CHEN Jiarong1
	2
	ZHOU Changtai1
	2
	3
	ZHOU Tao1
	2
	ZHU Jianbo1
	2
	XIE Heping1
	2
	3

Cite this article:

CHEN Jiarong1,2,ZHOU Changtai1, et al. Experimental study on strain evolution and failure behavior of sandstone containing a single pre-existing flaw under compressive-shear loading#br#[J]. , 2023, 42(7): 1743-1758.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0742 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I7/1743

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