Temporal and spatial effects of ultra-long-term service foundation pits on existing tunnels
To effectively assess the risks associated with ultra-long-term service foundation pit excavation con-struction and address the resulting safety issues such as external soil settlement and existing tunnel deforma-tion,this study analyzes measured data to investigate the temporal and spatial effects of each stage of foundation pit construction on existing tunnels.The results indicate that the construction of diaphragm walls and engineer-ing piles exerts a"compression"effect on the external soil,thereby affecting tunnel deformation;the impact of protective structural construction before excavation on spatial effects is not significant,while settlement of buildings and the ground after excavation shows a notable spatial effect;during the construction process of ul-tra-long-term service foundation pits,the tunnel response can be divided into three stages,with the hazardous construction periods occurring 30-100 days after the diaphragm wall construction and 30-160 days after the excavation of the third layer of soil.
shield tunnelsexcavation of foundation pitstemporal and spatial effectsinfluence source methodground settlement
万方数据
维普
