The Hydraulic Water Conveyance Tunnel Secondary Lining Structure Temperature Stress Research

Widely used for the water conveyance project of large flow hydraulic structure form of the water conveyance tunnel, and the hydraulic water conveyance tunnel secondary lining of reinforced concrete structure is used to do.This style of lining can effectively make use of the reinforcement materials and the mechanical properties of concrete.Structure of the stress of surrounding rock pressure, gravity and temperature stress of lining structure.Lining structure of its own gravity is a constant, the pressure of surrounding rock is basically constant, so changes in atmospheric temperature and the temperature stress is the stress of tunnel secondary lining structure changes of the main reasons.Of 7 # tunnel through to lead China’s engineering data statistical analysis and finite element simulation, reveals the tunnel lining structure temperature field distribution and the temperature stress change, further expounds the influence of the temperature change of lining structure temperature stress.In this paper, the research results show that the1. When the segment internal surface temperature is less than the segment, the surface temperature with the decrease of the segment internal and external temperature difference, the medial segment of tensile stress and the segment of the lateral pressure of stress will be reduced, which can reduce the temperature difference inside and outside differential stress of lower segment inside and outside.2. In the thickness direction of the segment, the change of the temperature stress and the change of the temperature difference in sync.3. Under the operation condition of the temperature difference is bigger, the inner surface of concrete segment tensile stress is relatively large, and its value will increase with the increase of temperature difference.4. When the segment internal surface temperature is greater than the segment outer surface temperature, the mechanical characteristics of segment is changed, the maximum tensile stress occurs at the outer surface of the segment, just the opposite with the previous situation.But between temperature difference and maximum stress is still relevant, even under different conditions, is increases with the increase of temperature difference and maximum stress, decreases with the decrease of the temperature difference.There will be no small temperature difference is very big and stress conditions.5. The temperature of the value of the maximum principal stress under the condition of change and the change trend of temperature stress.