含预制椭圆形孔洞大理岩变形破坏力学特性试验研究

doi:10.13722/j.cnki.jrme.2017.1142

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Abstract By conducting uniaxial compression tests on prismatic marble specimens containing prefabricated elliptical holes，the effects of major-minor axis ratio(m) and inclination angle(?) of ellipse on the mechanical characteristics of rock were studied. Digital image correlation(DIC) was also applied to record and analyze the fracturing process and damage evolution of marble. The results show that the peak strength，elastic modulus and crack initiation stress level of specimens containing elliptical holes increase with the increase of ?，and all have different sensitivity to ? and m，in which the sensitivity of the peak strength to ? increases with the increase of m. With the increase of ?，the final failure modes of specimens containing elliptical holes can be mainly classified into splitting-shearing failure and shearing failure，while the influence of m on the crack coalescence and rock failure mode is not obvious. By observing the strain field on specimen surface，it is found that the deformation and fracture characteristics of marble before and after peak stress can be clearly characterized，where the local high strain zones are good indications of crack initiation and propagation. Based on the localization characteristics of global strain field，a method for measuring the crack initiation stress of rock with hole defects is proposed. When the crack initiation stress level reaches 39.83%–76.18%，the specimens containing elliptical holes are in the critical tensile crack initiation state.

Key words： rock mechanics elliptical hole deformation and fracture digital image correlation crack initiation stress level

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	ZHU Quanqi
	LI Diyuan
	LI Xibing

Cite this article:

ZHU Quanqi,LI Diyuan,LI Xibing. Experimental study on failure and mechanical characteristics of marble containing a prefabricated elliptical hole[J]. , 2019, 38(S1): 2724-2733.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1142 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2724

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