Experimental Study on Rock Thermophysical Properties of Railway Tunnel in High Geothermal Area
In order to study the thermophysical properties and influencing factors of railway tunnel rocks in the high geothermal area,this paper takes different lithologic samples in the tunnel as the research object,carries out indoor rock thermophysical(thermal conductivity,specific heat capacity)and basic physical and mechanical index tests,analyzes the differences of thermophysical properties of different lithologic rocks,and clarifies the correlation be-tween rock physical and mechanical indexes and mineral composition and rock thermophysi-cal properties.The results show that:the thermophysical properties of different lithology are significantly different,among which the thermal conductivity of sedimentary rock is the largest,followed by magmatic rock,and metamorphic rock is the smallest;the higher the u-niaxial compressive strength,dry density,longitudinal wave velocity,and quartz content of rocks,the greater their thermal conductivity;the uniaxial compressive strength,dry density and longitudinal wave velocity of rock are negatively correlated with the specific heat capacity of rock,while the water content of rock is on the contrary.
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