Abstract
Abstract. With the rapid growth of economy in coastal megacities, the construction of supertall buildings with deep pile foundations adjacent to tunnels in soft soil is inevitable. The additional subsidence of tunnel and long-term subsidence of soft soil was appeared caused by the supertall building load transferred through pile foundation. In this paper, a typical case in Shanghai where deep piles of supertall building group adjacent to a metro tunnel was selected, and the long-term monitoring data of tunnel deformation was collected and analysed. The layered subsidence of surrounding soft soil was analysed by using the monitoring data of extensometers in a land subsidence monitoring station near the study area. The results of data analysis showed that the construction of supertall building had a significant impact on the adjacent tunnel subsidence. Moreover, with the increase of the load transferred from building structure to pile foundation, the adjacent tunnel appeared sustained uneven subsidence. And the subsidence of tunnel in the study area mainly depended on the deformation of underlying soil.
Highlights
With the rapid growth of economy in coastal megacities (e.g. Shanghai and Tokyo), the construction of supertall buildings with deep piles adjacent to metro tunnels in the soft soil is inevitable
The friction resistance generated by supertall building pile will cause the change of foundation stress field through the stress transfer of soil mass, additional subsidence of these tunnels and longterm subsidence of soft soil will develop as a consequence, which will impact the tunnel stability and the Metro operation (Weng et al, 2016)
In order to accurately analyse the influence of supertall building loads, three measured data datums of the tunnel elevation were adopted respectively: the elevation when the subsidence monitoring on metro tunnel began in 1999, the elevation when the foundation pit base of Building A was completed in 2009, and the elevation at the position near the Park where was away from the building load
Summary
With the rapid growth of economy in coastal megacities (e.g. Shanghai and Tokyo), the construction of supertall buildings with deep piles adjacent to metro tunnels in the soft soil is inevitable. In order to accurately analyse the influence of supertall building loads, three measured data datums of the tunnel elevation were adopted respectively: the elevation when the subsidence monitoring on metro tunnel began in 1999, the elevation when the foundation pit base of Building A was completed in 2009, and the elevation at the position near the Park where was away from the building load. These results provide an example and can be used as a test case and example for similar engineering problems faced by other coastal megacities throughout the world. Xu et al.: Study on the influence of supertall building load on adjacent tunnel subsidence
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