Temperature Effect On The Structural Durability Of The Heat-supplying Tunnel

Heat-supplying tunnel is one of the most important structures to transmit heat. Heat-supplying tunnel is developing quickly in China keeping pace with the urban construction. The benefits of using heat-supplying tunnel to convey heating water are protecting environment, saving energy, improving the life condition and saving money. In China, the construction of heat-supplying tunnel is still under developing, but the existed heat-supplying tunnel has some serious durability problems. The heat-supplying tunnel which locates in a very complex underground environment usually under the roads must stand all the vehicles’loads. The heat-supplying tunnel also locates in high temperature situation in winter. Long term high temperature effect is still unclear to the durability of the ling of the tunnel.The main contents of the thesis include:(1) Come up with a formula through analyzing the temperature in the heat-supplying tunnel and solve it using the finite difference method with the help of MATLAB.(2) Find the temperature stress using the software ANSYS.(3) Find the reasons that result in the durability problems.(4)Analyze the temperature effect on the durability of the heat-supplying tunnel, such as the effects of invasion of chloride ions, carbonation, aggregate reaction and Sulfate reaction.(5) Analyze the structural durability of heat-supplying tunnel under the high temperature stress and come up with a uniform formula to describe the diffusion of all the ions.(6) Find the measures that can improve the structural durability of heat-supplying tunnel.