黑色页岩动载破坏的层理效应及损伤本构模型研究

doi:10.13722/j.cnki.jrme.2018.1333

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Abstract In order to investigate the anisotropic properties of layered shale under dynamic loading，seven groups of samples with different bedding inclinations were cored from the black shale in Longmaxi formation，and dynamic compressive experiments at three strain rate levels were carried out by using the split Hopkinson pressure bar. The influence of the bedding direction on failure mode，strength and energy consumption characteristics of shale was investigated，and the failure mechanism of shale was revealed. A dynamic loading damage constitutive model of shale considering both initial and loading damage was established. The results show that the failure modes of shale with different bedding inclinations under dynamic loading can be divided into splitting tensile failure，shear failure and mixed failure. Splitting tensile failure is more likely to occur in the case of small or large bedding inclination，while shear or mixed failure is more prone to appear at a medium inclination. The compressive strength shows a trend of decreasing first and then increasing with increasing the inclination at three strain rates，which manifests an obvious bedding effect. The compressive strength also has a rate-dependent effect，which is in competition with the bedding effect. In other words，as the strain rate increases，the strength will increase as well but the strength anisotropy will attenuate. The change trend of the energy consumption characteristics with the inclination is similar to that of the strength. The value of the energy consumption is rate-dependent，but the energy consumption rate is not sensitive to the strain rate. The established damage model considering the coupling effect of rock mass structure and loading is simple in structure and clear in physical meaning. It is shown that the model is in good agreement with the experimental data，especially for the situation of medium to high strain rate without stress-strain rebound. The established model can be of benefit to more accurately describe the deformation and failure behavior of layered shale specimen under dynamic loading.

Key words： rock dynamics bedding effect failure modes compressive strength energy consumptions damage model

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	Articles by authors
	SUN Qingpei1
	ZHANG Zhizhen2
	LI Peichao3
	SUN Ziyu1
	LU Detang1
	GAO Feng2

Cite this article:

SUN Qingpei1,ZHANG Zhizhen2,LI Peichao3, et al. Study on the bedding effect and damage constitutive model of black shale under dynamic loading[J]. , 2019, 38(7): 1319-1331.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1333 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I7/1319

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