Abstract
Taking the foundation pit project of Tanggu Station on Line B1 in Binhai New Area, Tianjin as the engineering background, the confined aquifer water level in this region is significantly lower than the ground water level, and leakage effects occur under the influence of dewatering and excavation. A numerical model for the deep foundation pit excavation process is established to predict the deformation behavior of the retaining structure at different excavation depths using numerical simulation methods, and to investigate the settlement patterns of existing buildings during the excavation process. Considering the cross-layer seepage characteristics of confined water and employing a fluid-solid coupling approach, this study examines the impact of unexpected construction stoppage at various excavation depths on adjacent building settlement induced by stratum re-consolidation due to confined water leakage.
Full Text
Preamble
Study on Settlement of Existing Buildings Adjacent to Foundation Pit Excavation Considering Cross-Layer Seepage Effect in Aquifer
TANG Enchao
China Railway 16th Bureau Group Co., Ltd., Beijing 100018, China
Abstract
This study investigates the settlement behavior of existing buildings adjacent to foundation pit excavation, using the Tanggu Station foundation pit project for Tianjin Metro Line B1 in the Binhai New Area as the engineering background. In this region, the confined aquifer water level is substantially lower than the surface water level, creating cross-layer seepage effects under the influence of foundation pit dewatering and excavation. A numerical model of the deep excavation process was established to predict the deformation behavior of the retaining structure at various excavation depths and to examine the settlement patterns of existing buildings throughout the excavation sequence. By incorporating the cross-layer seepage characteristics of confined water, a fluid-solid coupling method was employed to analyze how unexpected work stoppages at different excavation depths impact adjacent building settlement through cross-layer seepage-induced stratum re-consolidation.
Keywords: settlement prediction; foundation pit excavation; cross-layer seepage; fluid-solid coupling