Impact Analysis of Wall-Caisson Composite Structure Construction Adjacent to Rail Transit Bridge
Journal Title: Urban Mass Transit - Year 2025, Vol 28, Issue 5
Abstract
[Objective] The construction deformation control adjacent to operational railways is of utmost importance in current rail transit planning and construction. Therefore, it is necessary to study the effect of the diaphragm wall-caisson composite structure (hereinafter referred to as WCCS)parameters on the structural stress deformation characteristics, which are caused by the caisson interior excavation and the change patterns of the surrounding soil displacement. [Method] In the case study of a composite structure construction project adjacent to Shanghai-Suzhou-Nantong Railway Bridge in Nantong City, the finite-element software is used to analyze the internal forces, deformations, and the surrounding ground settlement patterns of the WCCS. [Result & Conclusion] Firstly, the caisson under the protection of a circular diaphragm wall exhibits relatively small horizontal deformation. Increasing the thickness of both the caisson and diaphragm wall will reduce the maximum deformation and stress in the WCCS itself. However, within the 3~5 m width range of sandwiched soil, the widening of sandwiched soil leads to increased stress and deformation in the diaphragm wall, with a sudden spike particularly observed at the 5 m width of sandwiched soil. Secondly, the uplift value of the bottom-sealed concrete and sandwiched soil is less affected by the thickness of the WCCS. However, within the 3~5 m width range of sandwiched soil, the soil uplift value first increases and then decreases, with the turning point occurring at the 4.5 m width of sandwiched soil. Thirdly, increasing the thickness of the caisson and diaphragm wall reduces the boundary of surrounding ground settlement, with particularly significant weakening effect of the caisson thickness. The width of sandwiched soil has a significant impact on ground settlement, which begins to increase markedly when the width exceeds 3.5 m. Lastly, a well-designed WCCS can improve the stability of the caisson and reduce the deformation impact of caisson construction on the surrounding environment.
Authors and Affiliations
Wei CHEN, Lei NI, Yin ZHOU, Chenglong DENG, Honggui DI, Zhanlin CAO, Qiyu YAO
Keywords
Related Articles
- EP ID EP766693
- DOI 10.16037/j.1007-869x.2025.05.015
- Views 17
- Downloads 0
Earth Chamber Pressure Prediction Method for Earth Pressure Balance Shield Based on LSTM-DNN Fusion Model
［Objective］ Earth chamber pressure is a key parameter for EPB (earth pressure balance) shield construction assessment. Accurate prediction of earth chamber pressure helps construction technicians take timely control me...
Critical Component Overheating Monitoring Algorithm Integrating Temperature-sensing Patches and Computer Vision Trains
［Objective］ The present temperature sensor-based monitoring solutions for critical train component temperature entail high investment and operation-maintenance costs, hindering the widespread adoption of such systems i...
Research on the Integrated Modes of Rail Transit Dispatching Command for Metropolitan Area
［Objective］ Researches on the integrated dispatching and command modes for metropolitan area rail transit conduce to address problems in operational management coordination and linkage among different levels of rail tr...
Numerical Study on Shape Discrimination of Land Subsidence Groove during Double-line Shield Construction
Objective The shape of the land subsidence grooves during double-line shield construction varies with the clear distance and buried depth of the tunnel. Thus, it is necessary to conduct an in-depth study on the evolution...
Urban Rail Transit Regional Collaborative Management Mode Based on Shanghai Resilient City Construction
Objective The regional collaborative management of urban rail transit (URT) is explored to assist in the construction of Shanghai resilient city. Research is carried out specifically on the collaborative management mode...