杭州地区某盾构区间施工地表变形预测参数的分析与确定

以杭州地铁某盾构区间隧道施工为背景,分别对盾构隧道上浮和盾构隧道水平2种工况建立计算模型,并计算盾构掘进施工引起的地表沉降,在每种模拟工况计算中取不同的地层损失率对地表沉降进行计算。将不同工况、不同地层损失率的计算结果与实测数据进行对比分析,并利用Peck公式计算结果进一步确认,以确定不同工况下的地层损失率:盾构隧道上浮工况下地层损失率约为1.9%;盾构隧道水平工况下地层损失率约为1%。以期为杭州和其他地区盾构施工引起的地表沉降预测提供参考。

Analysis on Parameters for Predicting Ground Surface Deformation Induced by Shield Tunneling: Case Study on a Shield-bored Tunnel in Hangzhou

A shield bored running tunnel of Hangzhou Metro is studied in the paper. 3D models are established for the case of normal shield posture and for the case of floating upward shield posture, and the ground surface settlement induced by the shield tunneling is calculated on basis of different ground loss ratios in different cases. The calculation results are compared with the measured data, and are verified by the results calculated by Peck formula. Conclusion is drawn that the ground loss ratio in the case of floating upward shield posture is 1.9% and that in the case of normal shield posture is 1%. The paper can provide reference for the prediction of the ground surface deformation induced by shield tunneling in Hangzhou and other cities.