Ground deformation prediction induced by shield tunnelling considering existing multi-story buildings

Abstract

Accurately predicting the impact of shield tunnel construction under buildings on the ground surface can reduce the impact of construction on buildings. During the process of shield tunneling under multi-story buildings, the stiffness and load of the buildings affects the deformation of the formation. This study explored the degree and mechanism about influence of the above two factors. First, based on the Mindlin’s solution promoted in semi-infinite space, a method was developed for the calculation of ground deformation caused by shield tunneling under multi-story buildings, including the influence of additional stress and stiffness brought by the buildings. Second, based on the analysis of the composition of a surface settlement tank and a surface horizontal displacement curve, a modified Peck formula and the formula of O’Reilly and New were reviewed. Finally, according to the present empirical formula and a modified formula, the surface deformation caused by shield tunneling was compared and analyzed in four cases: without buildings, with load of buildings, with stiffness of buildings, and with load and stiffness of buildings. The results demonstrated that the maximum value of surface settlement was the smallest when only the stiffness was considered, and it was the largest when only the load was considered. In practical applications, the building stiffness and load should be considered simultaneously.

Keywords

shield tunnel / Mindlin’s solution / Peck formula / surface settlement tank

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