Analysis of Bearing-settlement Characteristics of Extra-long Bored Piles in URT Deep Soft Stratum Underground Station
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 8
Abstract
Objective To effectively control the deformation of station structure during the excavation and usage of deep foundation pit in soft soil stratum, and to increase the bearing capacity of foundation pit bottom, it is necessary to conduct an in-depth study of the bearing-settlement characteristics of extra-long bored piles (hereinafter as EBP) with void in the upper part. Method Using an urban rail transit double-line L-shaped cross transfer station as example, the influencing factors of the bearing-settlement characteristics of EBP are analyzed through static load tests by self-balanced method and numerical modeling. The relationship between the bearing characteristics of EBP and the pile length, pile stiffness, and pile diameter is explored. Result & Conclusion The static load test results indicate that, during the incremental loading in load box of EBP with void in upper part, both the pile top displacement and the displacement growth rate gradually increase, with pile top exhibiting displacement rebound phenomenon during unloading. Numerical simulation analysis shows that the axial force of EBP shaft decreases gradually from pile top to pile end. When the pile top is under ultimate load, the axial force at pile shaft upper part is significantly greater than at pile end. Changes in pile shaft length and stiffness affect the bearing-settlement characteristics of extra-long piles with void in upper part, while changes in pile shaft stiffness have little impact.
Authors and Affiliations
Haixing ZHU, Chunlin DING, Yuhe LU, Guiying LI
Keywords
Related Articles
- EP ID EP742696
- DOI 10.16037/j.1007-869x.2024.08.025
- Views 36
- Downloads 0
Analysis and Solutions of Axle Counter Red-light Band Issues on Hangzhou Metro Line 1
Objective During the train commissioning and trial operation of Hangzhou Metro Line 1 Phase III section, abnormal occupancy (red-light band) appears in axle counter equipment at different positions along the line, signif...
Optimization Scheme of Internal Circulating Heat Dissipation System for Tram Ground Charging Device
[Objective] To solve the problems of unstable shell protection performance, complex HD (heat dissipation) system configuration, and low HD efficiency existing in current tram ground charging devices, a scheme of ICHD (in...
Basic and Alternative Route Determination in Interlocking Table and Conflicting Signal Verification for Urban Rail Transit Depot
[Objective] As the standard for debugging, opening, acceptance, and subsequent use of computer interlocking devices, the interlocking table plays a crucial role in improving operation efficiency, extending equipment life...
Flexural Performance Numerical Model Analysis of Transverse Welded Joints in Prefabricated Diaphragm Walls
［Objective］ The transverse joints within the panels of prefabricated diaphragm walls are the weak points in the entire wall structure. Therefore, it is necessary to study the stiffness and strength characteristics of t...
Design of Fully Automated Depot Train Inspection Operation Management System Architecture Based on Digital Twin
[Objective] Digital twin technology is the booster for many industries to embark on the path of intelligence, information, and digitalization. To promote the digital development of urban rail transit vehicle bases, a ful...