含裂隙岩体点触探破坏机制研究

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Abstract Rock cone penetration test is used to evaluate the mechanical properties of in-situ rock indirectly，while the rock failure pattern and mechanical behavior would be severely affected by the pre-existing cracks contained in the in-situ rock mass. To clarify the influence mechanism of the cracks on the cone penetration test and to quantify the effect of the pre-existing cracks on the cone penetration indexes，series of cone penetration tests and numerical simulations were conducted. The test results show that there exists an influence area of cracks below the cone indenter. When the surface crack extends to the vicinity of the loading indenter，shear failure plane generates and propagates from the indenter to the inner tip of the crack. The position of the crack inner tip dominates the cone penetration strength and the crack propagation path，and the correspondence between the cone penetration strength and the shearing path can be established based on the shear limit equilibrium. Additionally，numerical simulations were carried out to analyze the cone penetration behaviors in the case of the crack inner tip extending to different positions near the indenter. Based on the numerical analysis results，it is found that the affected area of the pre-existing crack can be determined according to the failure pattern. Moreover，the weaken coefficient is also defined to quantify the effect of different pre-existing cracks on the penetration strength. Based on the energy dissipation of different fracture paths，the fracture characteristics with multiple cracks under cone penetration test were also discussed.

Key words： rock mechanics cone penetration test failure mechanism crack failure patterns

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	Articles by authors
	MAO Rui1
	2
	FANG Kai1
	2
	ZHAO Tongbin1
	2
	LIU Nianwu3

Cite this article:

MAO Rui1,2,FANG Kai1, et al. Failure mechanism of rock with pre-existing surface crack under cone penetration test[J]. , 2022, 41(6): 1183-1192.

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https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I6/1183

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