Analysis of the Influence of Subway Tunnel underneath Existing Building Pile Foundation
In the construction process of subway tunnel,the stress and deformation of pile foundation will be af-fected when the tunnel passes through the upper building.At the same time,the unloading of pile foundation dur-ing construction will also affect the stress of tunnel structure.Therefore,it is of great significance to study the pile foundation of subway tunnels under buildings.In this paper,the pile foundation of Chengdu Metro Line 6 under-neath the mixing station is taken as the engineering background,the Midas GTS software is used to establish the three-dimensional numerical calculation model of pile foundation-tunnel,the three-bench reserved core soil method construction technology is used for numerical analysis of the pile foundation of the subway tunnel under-neath the existing building,and the comparative analysis is carried out in combination with the surface settlement monitoring value.The results show that after the excavation of the tunnel,the displacement of the surrounding rock,the displacement of the pile foundation,the stress of the pile foundation and the surface settlement are small,indicating that the construction is safe and reliable.At the same time,the simulated value and measured value of surface subsidence are compared and analyzed,it is found that the variation law of the two is basically the same and the relative error is small.Therefore,it can be concluded that numerical model established in this paper has a high rationality.
万方数据
维普
