某盾构隧道下穿引起建筑基础沉降数值分析

Numerical Analysis for Foundation Settlement Caused by Shield Tunnels Construction

本文以某城市地铁盾构隧道工程为背景,采用三维数值模拟方法结合现场实测数据对盾构施工后上部建筑基础沉降规律进行研究分析。根据盾构隧道轴线与建筑基础相对位置对不同隧道下穿方式引起的上部基础平均沉降量与差异沉降量进行统计与计算分析,实测和计算结果均表明:盾构隧道在侧下穿上部建筑时,其基础平均沉降与正下穿工况下较为接近,但是其基础差异沉降和倾斜程度较大。本案例中侧下穿时基础每延米沉降差约为正下穿时的3倍左右,实测沉降数据分布与计算结果较为一致,研究方法和结论可作为相似隧道工程中沉降控制的参考依据。

Based on the shield tunnel construction of an urban subway,the foundation settlement caused by shield construction is studied and analyzed by using three-dimensional numerical simulation and field measured data.Accord-ing to the relative position between the shield tunnel axis and the building foundation,the analysis of the average set-tlement and differential settlement of the building foundation caused by different tunnel underpass modes is carried out.The measured and calculated results show that when the shield tunnel underpass the building foundation on the edge,the average settlement of the foundation is close to that under the straight-through condition,but the differential settle-ment and inclination of the foundation are larger.In this case,the settlement difference per meter of the foundation with side underpass condition is about three times that with straight-through.The distribution of measured settlement data is consistent with the calculation results.The research methods and conclusions can be used as a reference for set-tlement control in similar tunnel projects.