Study on the Deformation Law of Foundation Pit with Shared Ground Connecting Walls

Abstract

This study comprehensively investigates the mechanical behavior and deformation patterns of adjacent foundation pits sharing a common ground connecting wall. Utilizing a combination of detailed field measurements and finite element modeling, the study simulates the excavation process to analyze the mutual interactions between two adjacent pits of equal depth. Results indicate that the excavation of a subsequent pit influences both surface settlement and the horizontal displacement of the retaining structure of the first-excavated pit. Specifically, the surface settlement outside the first-excavated pit increased by 0.08% $H$ (where $H$ is the excavation depth of the first pit) within the influence range of 0 to 2.9 $H$ from the shared ground connecting wall. Similarly, within the range of 2.76 $H$, the horizontal displacement of the retaining structure of the first-excavated pit showed the greatest increase at 2 $H$, reaching 0.086% $H_{0}$.Mitigative measures, such as increasing the wall thickness or optimizing the excavation sequence, are found to effectively control deformation.These findings provide valuable insights into the design and construction of excavations involving shared ground connecting walls.

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