Considering the Analytical Solution of Viscoelastic-plastic Surrounding Rock in Deep Buried Hydraulic Tunnels at High Ground Temperature under Stress Path
In the viscoelastic-plastic rock mass of the hydraulic tunnel buried deep in high ground temperature,due to the influence of high temperature environment and tunnel cooling,certain temperature stress is generated in the surrounding rock.Therefore,when studying the analytical solution of surrounding rock of high geothermal tunnel,it is necessary to study the influence of temperature stress on the plastic zone and stress strain of the surrounding rock.Based on the mechanical model of viscoelastic-plastic surrounding rock of high-geothermal deep-buried hydraulic tunnel composed of generalized Kelvin model and Bingham model,and considering the influence of stress path on surrounding rock and support,combined with the influence of temperature stress on surrounding rock and lining in high-geothermal environment,the analytical solutions of stress,strain,cave wall displacement and radius of plastic zone radius of sur-rounding rock under the thermodynamic coupling of high-geothermal environment were derived.Based on the analysis and calculation of a highland temperature hydraulic tunnel project in Xinjiang,the relationship between temperature,stress strain and plastic zone radius of surrounding rock was theoretically calculated and analyzed.The results show that the displacement of the surrounding rock calculated after considering the temperature stress is smaller.When the temperature change in the tunnel reaches a certain amount,the resulting temperature stress may affect the stability of the surrounding rock interaction with the lining.
hydraulic tunnelsstress pathstemperature stresstemperature fieldviscoelastic-plasticitylet the pressure support
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