干湿循环作用下预制裂隙炭质页岩力学特性及强度准则研究

doi:10.13722/j.cnki.jrme.2021.0730

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Abstract In order to investigate the influence of drying-wetting cycles and the fissure angle on the mechanical properties of carbonaceous shale with pre-existing fissures，uniaxial and triaxial compression tests on carbonaceous shale with pre-existing fissures after drying-wetting cycles(0，5，15 and 20 times) were carried out. The results show that the peak strength，cohesion and internal friction angle of carbonaceous shale gradually decrease with increasing the number of drying-wetting cycles，which manifests an obvious drying-wetting deterioration effect. The degree of deterioration is as follows：peak strength＞cohesion＞internal friction angle. The strength deterioration degree of carbonaceous shale after drying-wetting cycles gradually decreases with increasing the confining pressure，which indicates that the confining pressure has an inhibitory effect on the drying-wetting deterioration effect. The peak strength，cohesion and internal friction angle of carbonaceous shale show a trend of decreasing first and then increasing with increasing the fissure angle，which manifests an obvious angle effect. However，the angle effect and drying-wetting deterioration effect are mutually inhibited. In other words，as the number of drying-wetting cycles increases，the peak strength，cohesion and internal friction angle will decrease and the angle effect will attenuate. By introducing two mechanical parameters(and ) into the Drucker-Prager criterion，a strength criterion was established considering the drying-wetting cycles and the fissure angle，which can well describe the drying-wetting deterioration effect and angle effect of the strength. The research results can provide a reference for the strength estimation of carbonaceous shale in engineering practice and the stability analysis of slopes.

Key words： rock mechanics drying-wetting cycles pre-existing fissure carbonaceous shale mechanical properties strength criterion

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	LIU Xinxi
	LI Yu
	WANG Weiwei
	ZHOU Yanming
	CHENG Lei
	FAN Zijian

Cite this article:

LIU Xinxi,LI Yu,WANG Weiwei, et al. Research on mechanical properties and strength criterion of carbonaceous shale with pre-existing fissures under drying-wetting cycles[J]. , 2022, 41(2): 228-239.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0730 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I2/228

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