Influence of Deep Foundation Pit Construction on Deformation of Operating Station Sharing Enclosing Structure
Based on project example that the Nijiaqiao station of Chengdu Metro newly-built Line 18 is super close and parallel to the station of Line 1,sharing the existing retaining pile of Line 1,and the deep foundation pit is constructed by half-cover excavation method,using the numerical simulation,the retaining pile is equivalent to the diaphragm wall and the influence of deep foundation pit excavation on the deformation of existing subway stations under different pile diameters and the number of inner supporting layers is analyzed.The results show that the excavation unloading of the foundation pit causes the soil to be displaced and drives the displacement of the subway structure in the soil,which is reflected in the vertical uplift and the lateral deviation to the excavation side of the foundation pit.Increasing the thickness of the diaphragm wall can reduce the deformation of the existing station,but the thickness of the diaphragm wall is greater than 0.76 m,the effect of controlling deformation is not obvious.When the number of support layers is more than 2 layers,the effect of inhibiting the horizontal displacement of the side wall and the surface settlement is not obvious.
subway stationdeep foundation pitsuper close and parallelenclosing structuresettlement monitoringdeformation controlstability
万方数据
维普
