基于应力与时间双阈值的岩石全时态非线性蠕变损伤模型

doi:10.13722/j.cnki.jrme.2022.1147

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Abstract In order to more appropriately describe the nonlinear deformation law of the rock creep damage process and to establish a function between damage factor and time，the stress and time are used as controlling factors to re-divide the rock creep stages，and the instantaneous plastic element is introduced to improve Bingham body. Improved Bingham body，Murayama body and CYJ body are held together to describe each stage of creep respectively. Then，elastic and viscous components in the model are treated by damage theory. The one-dimensional and three-dimensional nonlinear creep damage model principal structure equations of the rock are established. By indoor triaxial compression creep graded loading and unloading tests，the evolution law for elastic and viscous element parameters(Murayama body，CYJ body) during rock creep are given. Then，obtained the cumulative development trend of the damage effect，which can be identified the process parameters. Last，the feasibility and correctness of the established model are verified by comparison. The study shows that：the hardening effect of the elastic element and the damage effect of the viscous element in the Murayama body，the dynamic evolution between the two constitutes the deformation characteristics of the isokinetic creep phase of the rock，which is manifested in the equilibrium relationship between the two inflection points of isochronous stress-strain curve. Between the viscous element and the rock's own damage，the joint action of time and stress in the CYJ body promotes the mutual superposition，further weakening the rock?s resistance to deformation，which can be verified from the damage accumulation development curve. By stress increase and time effect，the rock damage accumulation shows exponential increase，the creep process of the rock becomes the whole process of damage generation→diffusion→accumulation→release. In the model parameter identification and verification，the correlation coefficient R2 reached 0.982 with the fitted curve and the test curve，which verified the feasibility of the constructed all-time nonlinear creep damage model. A full-temporal nonlinear creep damage model for rocks，constructed by nonlinear components and damage mechanics treatment，can not only characterize the damage evolution of the whole creep process，but also accurately describe the nonlinear deformation law of the accelerated creep stage of rocks. This is new attempt to the creep model construction method.

Key words： rock mechanics stress-time double threshold nonlinear deformation creep damage full-time state damage accumulation

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	Articles by authors
	YU Bingbing
	LI Qing
	ZHAO Tongde
	HUANG Chen
	GAO Zhenghua
	WANG Kai

Cite this article:

YU Bingbing,LI Qing,ZHAO Tongde, et al. Full-time nonlinear creep damage model of fractured rock mass based on stress-time double threshold[J]. , 2023, 42(8): 1928-1944.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1147 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I8/1928

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