基于热力学理论的水泥石热–力耦合本构模型和有限元分析

doi:10.13722/j.cnki.jrme.2017.0766

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Abstract The plasticity and stress non-linearity of cement sheaths under thermal loadings have significant influence on the integrity logging of deep geothermal well systems. A thermal-mechanical elasto-viscoplastic model based on the thermodynamics is established with the density and the elastic strains coupled with the temperature and the dissipative equations coupled with the elastic strains. The model is able to simulate many important properties of cement stones in isothermal tests and the degradation of strength and stiffness with the rising of temperature in non-isothermal tests. A finite element code with transient heat conduction is developed based on the constitutive model. The code is then applied for the temperature and stress analysis of a CNPC geothermal well in Kenya. Results show that the thermal-induced mechanical stresses，especially at interfaces, are non-monotonic during the monotonic thermal loading. The consideration of energy dissipation is essential for the reasonable estimations of hysteresis and plastic deformations of cement stones.

Key words： underground engineering cement stone thermal-mechanical coupling thermodynamic constitutive model deep geothermal well finite element analysis

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	Articles by authors
	WANG Hao1
	ZHANG Zhichao1
	2
	CHENG Xiaohui1

Cite this article:

WANG Hao1,ZHANG Zhichao1,2, et al. A thermal-mechanical constitutive model for cement rock based on thermodynamics and its finite element application[J]. , 2018, 37(1): 67-76.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0766 OR http://www.rockmech.org/EN/Y2018/V37/I1/67

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