某盾构隧道施工对周边建筑物影响分析

Analysis on Influence of Shield Tunneling Construction on Adjacent Buildings

盾构隧道施工会引起周围地层位移,从而对周边建筑物产生不利影响。为保证施工过程中周边建筑物的安全,在工程项目实施前需要进行安全评估。依托浙江宁波某在建盾构隧道工程项目,通过MIDAS GTS三维有限元分析软件对盾构隧道的掘进过程进行了模拟,分析不同程度施工扰动作用下建筑物的沉降位移。并结合当地盾构隧道施工的地表沉降监测数据,对上部建筑物的安全进行评估,提出盾构施工监测数据的关键控制指标。分析结果表明对于该工程,在盾构隧道的掘进施工过程中,位于其上方的建筑物安全可靠。通过该方法可以用既有的施工监测数据对建筑物沉降进行预测,为相关工程提供方法指导。

The shield tunneling construction will cause the displacement of surrounding strata, thus, which has an adverse effect on the surrounding buildings. In order to guarantee the safety of surrounding buildings in the construction, the safety evaluation should be carried out before project implementation.Based on a shield tunneling project under construction in Ningbo, Zhejiang Province, the tunneling process of shield tunnel is simulated by three-dimensional finite element analysis software MIDAS GTS to analyze the settlement and displacement of the buildings during the different degrees of construction disturbance. Combined with the ground surface settlement monitoring data of the local shield tunneling construction, the safety of superstructure is assessed and the key control indexes of shield construction monitoring data are proposed. The analysis result shows that the buildings above the project are safe and reliable during the shield tunneling construction. This method can be used to predict the settlement of the buildings with the existing construction monitoring data, which provides the method for guiding the related projects.