考虑峰后脆性跌落的油页岩统计损伤本构——以鄂尔多斯盆地长7段为例

doi:10.3724/1000-6915.jrme.2025.0136

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Abstract To elucidate the mechanical properties of oil shale in the Chang 7 Member of the Ordos Basin, triaxial compression experiments were conducted under various confining pressures and bedding inclinations. Based on the characteristics of the stress-strain curves of the Chang 7 Member rocks, a quantitative brittleness evaluation index was proposed. A damage constitutive model, which incorporates post-peak brittle drop, was established by integrating damage mechanics with residual strength and the Drucker-Prager criterion. The results demonstrate that: (1) The deformation of oil shale primarily occurs in three stages: elastic deformation, strain hardening, and strain softening. (2) As confining pressure increases, the compressive strength, residual strength, peak strain, and elastic modulus increase, while brittleness and fracture complexity decrease. (3) Oil shale oriented perpendicular to the bedding planes exhibits higher strength but lower stiffness and brittleness, displaying pronounced anisotropic characteristics. (4) The proposed model effectively accounts for the stress drop rate (brittleness) and outperforms Weibull distribution-based models in predicting the post-peak brittle behavior of rocks, with theoretical curves aligning more closely with experimental stress-strain curves.

Key words： rock mechanics oil shale statistical damage constitutive brittleness

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	Articles by authors
	ZENG Ping1
	2
	WEI Shiming1
	2
	XIA Yang1
	2
	JIN Yan1
	2
	ZENG Hao2
	3

Cite this article:

ZENG Ping1,2,WEI Shiming1, et al. Statistical damage constitutive of oil shale considering post-peak stress drop: taking the Seven Member of Yanchang Formation in Ordos#br# Basin as an example[J]. , 2025, 44(9): 2408-2419.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0136 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I9/2408

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