Numerical Model Of Thermo-Mechanical Coupling For The Tensile Failure Process Of Rock

Temperature changes can cause thermal stress in brittle materials,such as rock.When the thermal stress exceeds the strength limit of the material,it will break.This is the thermal cracking of rock,which will lead to the safety of mining engineering.Such as in the process of underground coal gasification,the rock of gasifier wall under high temperature,so the gasifier wall rock stress field will be changed.It will lead to the surrounding rock fracture,which can further result in roof fall.Therefore,it is important significance for mining engineering to research the failure process of rock under temperature.The finite element model of tensile failure is established based on the principle of tensile failure.The crack growth process of the slope under different interlayer inclination,the depth of the interlayer,the thickness of the interlayer and the slope angle of the slope is studied.The first principal stress evolution is discussed and providing a reference for the actual slope engineering protection.A numerical model of thermal cracking with a thermo-mechanical coupling effect was established by using the theory of tensile failure and heat conduction to study the tensile failure process of brittle materials,such as rock and concrete under high temperature environment.The validity of the model is verified by thick-wall cylinders with analytical solutions.The failure modes of brittle materials under thermal stresses caused by temperature gradient and thermal expansion coefficient difference were studied by using a thick-wall cylinder model and an embedded particle model,respectively.Model results are in good agreement with the experimental results,thereby providing a new finite element method for analyzing the thermal damage process and mechanism of brittle materials.