软弱富水地层超大直径盾构下穿 长江堤防变形分析.

The deformation of the Yangtze River embankment on soft and water-rich strata is greatly affected by the disturbance of the construction of the shallow buried super-large diameter shield tunnel. Based on on-site monitoring data, under the background of a large double-line shield tunneling project with a diameter of 15. 07 m, the spatiotemporal evolution law of the settlement of the Wuwei Yangtze River embankment was studied and the rationality of excavation parameters and embankment reinforcement measures were analyzed. The research results indicate that the amplitude of surface settlement of embankments can be effectively reduced by the reinforcement treatment of compacted grouting. When the right tunneling passed through the embankment, the overall settlement deformation of the embankment above the central axis increased with the number of days the shield tail leaves. The maximum settlement was located in the front section of the embankment, which was 20. 37mm, and there was generally a slight uplift far from the central axis. After the left tunneling passed through the embankment, the overall vertical deformation of the embankment followed a distribution pattern of “ uplift of the front and back sections of the left embankment, settlement of the embankment section, and overall settlement of the right line, with a decrease in amplitude from the front section to the back section of embankment” . Thus, it is concluded that when shield tunneling passes through the Yangtze River embankment, the adjustment of excavation parameters such as incision pressure, thrust, and torque is affected by the overload effect of the embankment. [ABSTRACT FROM AUTHOR]