Frost Heaving Analysis of Water Behind Tunnel Lining in High Altitude Cold Region
The freezing expansion of fissure water in the surrounding rock of tunnels in high altitude cold regions will have an important impact on the safety of tunnel structures.Based on the frost heaving theory of ponding behind the tunnel lining in cold regions,the stratum-structure model ofhighway tunnel in high altitude cold regions was established.The evolution of the interaction between surrounding rock and supporting structure during the frost heaving process of ponding behind the tunnel lining were studied,and the influence of water storage frost heaving in cavity on the stress distribution and structural deformation of the lining under different frost heaving rates were analyzed.Research results were concluded as follows.The maximum principal stress of the lining increases with the increase of frost heaving rate and reaches the peak value when the frost heaving rate is 6％.When the frost heaving rate is lower than 5％,the frost heaving has little influence on the minimum principal stress of the structure,and the frost heaving after the structure cracking has significant influence on the minimum principal stress.For a tunnel in class V surrounding rock,the frost heaving deformation of the water storage cavity towards the surrounding rock side is greater than that towards the lining side,and the smaller the frost heaving rate is,the greater the proportion of deformation towards the wall rock side is.In the design and construction of tunnels in cold regions,full attention should be paid to the treatment of cavities behind the lining.The close connection between the lining and surrounding rock can effectively reduce the frost heaving pressure of ponding behind the tunnel lining.
cold region tunnelwater frost heavingfrost heaving ratestress characteristics
万方数据
维普
