基于能量理论的侏罗系砂质泥岩强度准则

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Abstract In order to clarify the physical and mechanical properties，energy evolution law and failure mechanical behavior of the weakly cemented Jurassic sandstone mudstone in the western region，triaxial compression tests are carried out on the weakly cemented Jurassic sandstone mudstone under natural and saturated conditions. Based on the experimental outcomes and the principle of energy conservation，the physical and mechanical characteristics，modes of failure，and energy evolution laws of the sandstone mudstone under both conditions have been determined. Furthermore，an energy intensity criterion for the sandstone mudstone has been developed based on its nonlinear relationship between the density of elastic potential energy and confining pressure，complemented by the provision of an appropriate formula for calculating shear stress. Ultimately，the validity of the energy intensity criterion has been confirmed by comparing it with three classical strength criteria against experimental outcomes. The study shows that，(1) both the peak strength and the softening coefficient of the sandstone mudstone under two different states increase with confining pressure，yet the rate at which the softening coefficient increases is inversely related to the confining pressure；under uniaxial conditions，the failure mode is characterized by splitting tensile rupture，and under triaxial conditions，the failure mode is characterized by shear rupture. (2) Both the total strain energy density and the dissipated energy density of the sandstone mudstone under the two conditions are directly proportional to axial strain，while the elastic energy density increases initially and then decreases as axial strain grows；at the peak stress，the total strain energy density，elastic energy density，and dissipated energy density all show a nonlinear increase with rising confining pressure. (3) The energy intensity criterion is represented as an equilateral but non-isosceles hexagon on the deviatoric plane and as an irregular hexagonal pyramid in the principal stress space，characterized by well-defined physical meanings of its parameters and a simple solution approach. (4) In contrast to other strength criteria，the energy intensity criterion，along with its formula for calculating shear stress，provides greater precision in calculations and covers a wider scope of applications. The research outcomes can offer beneficial insights for the investigation of strength criteria for Jurassic sandstone mudstone in the western areas，as well as for analogous weakly cemented geological formations.

Key words： rock mechanics weakly cemented sandy mudstone triaxial compression elastic strain energy strength criterion energy evolution

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	Articles by authors
	WANG Xiaoyun1
	CHENG Hua1
	2
	3
	RONG Chuanxin1
	WANG Zongjin4
	YAO Zhishu1
	ZHANG Liangliang1

Cite this article:

WANG Xiaoyun1,CHENG Hua1,2, et al. Strength criterion for Jurassic sandy mudstone based on energy theory[J]. , 2025, 44(2): 427-441.

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https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I2/427

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