Study On The Lining Crack Disease Of Tunnel And Its Control Measures In High-speed Railway

In recent years, the high-speed railway in China is developing at full speed, tunnel as a bottleneck project in the high-speed rail line, its structure security is critical for the safety of crew and train. However, the lining crack of tunnel is a common disease which is harm to the safety of the structure. Therefore, it is very necessary to study on the form, expand and measures of lining crack of tunnel in the high-speed railway line. For this, supported by Guangzhou railway administration issue 《Study on the regulation technique on crack defect of tunnel lining of Wuhan-Guangzhou high-speed railway》 and Zhejiang province communications department issue 《Study on the key regulation technology on leakage of disease on Taizhou highway tunnel》, some work has been made in this paper as followings:(1) Take an example of a twin-track tunnel on Wuhan-Guangzhou high-speed railway, based on the load structure method, establishing a spatial structural model of the lining and analyzing the deformation of the lining and the crack distribution under the condition of common diseases existing, such as bias, cavity behind the lining and the insufficient thickness of the lining and so on.(2) Establishing a two-dimension model of lining with crack on it, analyzing the extended state and trend of the crack on the lining of tunnel in high-speed railway line under the conditions of different width and depth of crack, and analyzing the influence of aerodynamic on the extension of the crack of lining.(3) Based on the analysis of extension regulation of the high-speed railway tunnel lining crack, combining with the domestic existing crack rank evaluation standards of highway and ordinary railway tunnel. Put forward the grade evaluation standard of crack on the lining of tunnel in high-speed railway line.(4) Analyzing the effect after taking the controlling crack measures and based on the grade evaluation standard of crack, combining with some common controlling crack measures at the moment, put forward reasonable measures on controlling different crack situation on the lining of tunnel in high-speed railway line.