Analysis of Deformation Characteristics of Deep Foundation Pit in Urban Rail Transit Station under Unbalanced Load
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 3
Abstract
[Objective] At present, the underground engineering diseases and accidents caused by unbalanced load in urban rail transit are increasing gradually. In order to understand the adverse effect of unbalanced load on the deformation of deep foundation pit in urban rail transit station and reduce the construction risk, it is necessary to analyze the deformation characteristics of station deep foundation pit under unbalanced load. [Method] Based on theoretical analysis and on-site monitoring data, the aforementioned deformation characteristics are studied, the changing law regarding the retaining pile deformation, the horizontal displacement of the deep soil and ground settlement is analyzed, and the interrelation between the retaining pile deformation and the deep soil horizontal displacement, the ground settlement and excavation depth is discussed. [Result & Conclusion] The horizontal displacement curve of the retaining pile is fish-belly shaped, and the formation condition has obvious influence on the deformation of the retaining pile. There is a roughly linear relationship between the deformation of the retaining pile and the horizontal displacement of deep soil, and the empirical coefficient is proposed to be 1.30. Due to partial load, the ground settlement around the deep foundation pit is larger, and the relationship between the maximum horizontal displacement δhm of the retaining pile and the maximum ground settlement δvm is δvm=(0.9~3.0) δhm, and the proportional coefficient between them is greater than the value under symmetric load. The strong deformation resistance of rock strata limits the deformation of the retaining pile. There is a relationship of δhm=(0.009%~0.060%) He between δhm and He, and the proportional coefficient between them is smaller than the value under symmetric load. The impact area of deep foundation pit construction on the surrounding environment is mainly divided into Zone 1 (main impact zone), Zone 2 (secondary impact zone) and Zone 3 (no impact zone), and the impact area of foundation pit construction is about (0~2.5) He.
Authors and Affiliations
Tao LIU, Lei JIANG, Shen WANG, Hongguo PENG, Yan LI
Keywords
Related Articles
- EP ID EP732785
- DOI 10.16037/j.1007-869x.2024.03.011
- Views 96
- Downloads 0
Research on Characteristics of Shanghai Rail Transit Commuter Flow
Objective Shanghai′s rail transit boasts of huge commuter flow, and it is necessary to analyze the spatial distribution, connection and other characteristics of the passengers using urban rail transit for commuting. Meth...
Redundant Speed and Distance Measuring System at Train Head and End Based on CAN Bus
Objective Data interconnection and interaction are realized through ATP (automatic train protection) system in most of the existing train speed and distance measuring technologies. However, the implementation process is...
Application of Platform Screen Door Gap Detection Device on Fully Automatic Operation Metro Lines
Objective On the fully automatic operation metro lines, there exists a gap between the platform screen door and the train, leading to the risk of clamping people and objects. In order to ensure train operation safety, a...
Necessity of Inverted Supports in the Inclined Strut Section of the Foundation Pit with Strip Bottom Plate and Diaphragm Wall
[Objective] In order to save project investment, strip bottom plates that are not fully closed are used for the foundation pit bottom sealing in some foundation pit inclined strut sections. After the removal of the lowes...
Types and Implementation Key Points of Expansion and Renovation for Urban Rail Transit Existing Lines
［Objective］ At present, some urban rail transit lines face significant mismatches between passenger flow demands and capacity supply. Capacity expansion and renovation is the common approach to enhance line transportat...