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Mechanics State Analysis of Secondary Lining on Tunnel Based on Temperature Effect

Author: CaiTian
Tutor: ChenJianXun
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: Tunnel project Secondary lining Temperature stress Numerical Simulation
CLC: U451.4
Type: Master's thesis
Year: 2011
Downloads: 40
Quote: 0
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Abstract


When operating the tunnel is located in the cold annual temperature larger areas lining concrete under the influence of the temperature cycling , force structure is more complex . National trunk road segment Qingdao to Yinchuan Shaanxi environment wubu , to ZIZHOU highway tunnel group liujiaping relying on long-term monitoring of the tunnel lining concrete stress , through the collation and analysis of monitoring data , combined with the finite element numerical simulation obtain the mechanical characteristics of the secondary lining concrete structure in the case of changes in ambient temperature . The key findings include: (1) in tunnel operations process , the temperature was sine law changes over time , the force of secondary lining concrete structures also showed trigonometric law changes , stress curve changes over time and temperature changes over time curve has the same trend , the same time the two curves stress of Extreme . (2) the secondary lining the force main from the surrounding rock pressure , secondary lining gravity and temperature stress . The lining weight is constant pressure of surrounding rock with time goes basically stable , so the concrete temperature stress is caused by changes in temperature cause the secondary lining structure was the main reason for the trigonometric law changes the stress with time . ( 3) use of finite element software (ANSYS) Numerical simulation of tunnel lining structure temperature stress , the simulation results show that the secondary lining concrete cooling temperature stress is tensile stress , tensile stress reaches its maximum when the temperature minimum . Under the same temperature conditions the maximum tensile stress values ??invert the middle same measured point temperature stress showing changes over time sine law changes , the results are in good agreement with numerical simulation results and experimental data analyzed . (4) In order to prevent secondary lining ring cracking , tunnel lining construction joint spacing calculated calculated drawn construction joint spacing annual temperature difference , the difference in temperature between the larger construction joints smaller the pitch . For the secondary lining in southern China tunnel construction process template the trolley length for elected 12m , far away from the hole for cold northern regions according to the annual range of temperature should be selected , the tunnel site 9m or 6m long jumbo , long tunnel template Desk The car can be appropriately extended .

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CLC: > Transportation > Road transport > Tunnel project > Tunnel structure theory > Theory of tunnel lining
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