受极端天气影响人工湖水位快速上升，下穿人工湖的地铁盾构隧道产生沉降。为研究地铁盾构隧道结构下沉变形的原因，并对变形后盾构隧道结构安全进行评估。通过对现场监测数据分析，并采用荷载结构模型对盾构隧道强度进行验算、地层结构模型模拟盾构隧道上方堆载及卸载工况对盾构隧道变形进行分析。计算结果显示，人工湖水位上涨为盾构隧道变形下沉的主要原因，产生变形后隧道结构自身承载能力及裂缝宽度均满足设计和规范要求盾构隧道，盾构隧道结构自身依然是安全的。

Affected by extreme weather, the water level of the artificial lake rises rapidly, and the subway shield tunnel passing through the artificial lake subsides. In order to study the reasons for the subsidence deformation of the subway shield tunnel structure, and to evaluate the structural safety of the shield tunnel after the deformation. The deformation of the shield tunnel is analyzed by analyzing the monitoring data on site, using the load structure model to check the strength of the shield tunnel, and the stratum structure model simulating the loading and unloading conditions above the shield tunnel. The calculation results show that the rising water level of the artificial lake is the main reason for the deformation and sinking of the shield tunnel. After the deformation occurs, the bearing capacity and crack width of the tunnel structure meet the design and specification requirements of the shield tunnel, and the shield tunnel structure itself is still safe.

U231.1