Typical Diseases of Metro Large Diameter River Crossing Shield Tunnel
Based on the disease investigation results of a large diameter river crossing shield tunnel in Nanjing Metro,the typi-cal disease characteristics of interval tunnel were discussed,and the direct causes of some diseases were preliminarily discussed.The results showed that the typical diseases of the interval tunnel relied on mainly included deformation of segment joints,seg-ment cracking,tunnel leakage,and internal structural cracking.The statistical results of segment joint misalignment within the interval met the normal distribution,and the value of lower measuring points were less than that of upper measuring points.The over limit rate of misalignment amount was less than 1％,and the misalignment amount of longitudinal joint of capping block was larger than other positions.Angle collapse had the largest proportion of segment damage.Bracket cracking was common in tunnels,and it had a certain correlation with the position of segment circumferential joint and prefabricated flue slab joint.The cracks of the middle partition wall were mainly distributed in the middle of the tunnel,and the leakage channel of the tunnel was mainly bolt holes.The dislocation of segment joints was the direct reason of the other related diseases.
large diameter shield tunneltypical diseasesegment dislocation and damageinternal structure crackingdis-ease characteristic
万方数据
维普
