|
|
|
| Numerical simulation analysis of ultra-deep foundation pit in silty clay formation under seepage |
| ZHU Xiaotian
|
| China Railway 14th Bureau Group Co., Ltd., Jinan 250000, Shandong, China |
|
|
|
|
Abstract Based on the deep foundation pit project of Yellow River Tunnel in Jinan, this paper studied the deformation rules of ultra-deep foundation pit in considering seepage and not seepage.The numerical simulation results were compared with the field measured data, and the final seepage hazard mode to the excavation of the ultra-deep foundation pit in the silty clay formation was mastered. Mohr-Coulomb model was modified for soft clay and clay. For soil with higher friction coefficient like sand, the Mohr-Coulomb model was adopted.The main 15 stages of foundation pit excavation under seepage were simulated, and the influence of foundation pit excavation on the surface settlement, the horizontal displacement of the underground continuous wall, and the influence on the bottom uplift of the foundation pit were finally analyzed. It was found that the seepage greatly affected the deformation of the foundation pit, which was greater than the posterior deformation value when the seepage was not considered. In the site construction, if the deep foundation pit design was conducted without considering the seepage action, it would cause great judgment error and make the project have great safety risks. The study in this paper provides empirical guidance for similar engineering.
|
|
Received: 24 January 2022
Published: 20 June 2022
|
|
|
|
|
|
|
|
