Effect Analysis of Excavation and Unloading of Deep Foundation Pit in Soft Soil Stratum on Pile Foundation of Underground Station

Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 6

Abstract

Objective In the excavation process of deep foundation pit of underground station in deep soft soil stratum, excavation and unloading of the overlying soil in the pit will obviously impact the previously constructed superlong pile foundation in the pit, threatening the structure stability and engineering safety. In order to explore the effects of large-scale deep foundation pit excavation and unloading on the pile group at the station foundation pit bottom, it is necessary to analyze the deformation law of the superlong pile under pressure. Method A numerical analysis software Midas GTS NX is used to establish a finite element numerical calculation model for the underground station S2 east end well and make the excavation simulation analysis. Based on a comparison of the on-site actual monitored data and the numerical calculation results, the deformation law of the pile group at the pit bottom affected by the foundation pit excavation is discussed. Result & Conclusion The results show that the pile area under tension increases with the deepening of excavation,both the maximum tension and the maximum pressure of the end well pile foundation are greater than the standard range. The vertical displacement of the pile foundation at the pit bottom continuously increases in the process of excavation. The largest pile displacement occurs at the farthest distance from the edge of the end well. In the later stage of excavation, as the incremental uplift of the pile foundation increases significantly, the vertical displacement of the pile top needs to be monitored in real time to prevent engineering accidents.

Authors and Affiliations

Yuhe LU, Haixing ZHU, Chunlin DING, Guiying LI

Keywords

Related Articles

Universal Standardization of Signal Vehicle Interfaces for Urban Rail Transit

Objective Upgrading and modifying signal system is difficult, costly and time-consuming, greatly affecting the line daily operation during its modification stage. In order to solve the above problem, the signal vehicle i...

Correlation Analysis of Evaluation Indicators for Shield Tail Sealing Grease Waterproof Performance

Objective The performance of shield tail grease significantly influences the effectiveness of the shield tail waterproof seal. While there are numerous performance indicators for shield tail grease, the relationship betw...

Review of Connection Methods for Assembled Metro Prefabricated Components

[Objective] The connection methods of prefabricated concrete components are crucial for the installation efficiency and structural stability of assembled metro systems. However, current research predominantly focuses o...

Optimization of Urban Rail Transit Train Stock Utilization under Re-coupling Operation Mode

[Objective] Re-coupling operation mode can effectively improve the matching degree between the passenger flow and the transport capacity of urban rail transit, while it also poses challenges to the formulation of the t...

Load Characteristics of B-type Metro Vehicle Bogie Frame

Objective The international standards adopted in metro vehicle design and verification in China do not fully align with the actual vehicle operating conditions, resulting in the phenomenon of fatigue cracks in some metro...

Download PDF file
  • EP ID EP737754
  • DOI 10.16037/j.1007-869x.2024.06.025
  • Views 85
  • Downloads 0

How To Cite

Yuhe LU, Haixing ZHU, Chunlin DING, Guiying LI (2024). Effect Analysis of Excavation and Unloading of Deep Foundation Pit in Soft Soil Stratum on Pile Foundation of Underground Station. Urban Mass Transit, 27(6), -. https://europub.co.uk/articles/-A-737754