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基坑开挖和上部结构施工引起的卸载和再加载会使邻近已建盾构隧道产生一定位移与变形.以上海已建地铁盾构隧道侧向和上方受基坑开挖和结构施工引起的卸载和再加载工况为背景,利用数值模拟方法,分析了隧道侧向和上方不同区域开挖和结构荷载施加过程中隧道的整体位移和隧道结构变形的发展规律.结果表明,隧道侧向与上方卸载,会使隧道位移与结构变形产生不同幅度的增加;而侧向与上方再加载,会减小因卸载而产生的隧道位移,但会增加部分隧道管片结构变形.因此只有综合分析隧道的位移与结构变形,才能合理预测分步卸载、再加载对已建盾构隧道的影响规律,减小因工程施工引发的已建盾构隧道结构安全风险.
Excavation and reloading caused by excavation and superstructure excavation will cause some displacement and deformation of the adjacent shield tunnels.Before the construction of Shanghai Metro Tunnel Shield is caused by excavation and construction of the side and above the shield tunnel Unloading and reloading conditions as the background, the numerical simulation method was used to analyze the development of the overall displacement of the tunnel and the deformation of the tunnel during excavation and structural load application in different sides of the tunnel. The results show that the lateral and The unloading at the top will increase the displacement and structural deformation of the tunnel with different amplitudes, while the lateral and top reloading will reduce the tunnel displacement caused by unloading but will increase the structural deformation of some of the tunnel segments, so only the comprehensive analysis of the tunnel Of the displacement and structural deformation in order to reasonably predict the step-by-step unloading and then load the impact of the shield tunnel has been built to reduce the risk of construction of the shield tunnel has been built due to structural safety risk.