Temperature Field Development Characteristics of Frozen Method Construction for Metro Link Passages in Shanghai Soft Soil Stratum
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 1
Abstract
[Objective] In order to predict the development of the frozen wall before the frozen method construction and validate the rationality of the design, providing a scientific guidance for engineering construction, it is necessary to study the temperature field development law of frozen method construction for Shanghai Metro link passages in soft soil stratum, and propose evaluation and economic indicators. [Method] Taking an interval of Shanghai Rail Transit Line 15 as engineering background, the frozen wall thickness, soil temperature, brine temperature, and freezing process are analyzed. A three-dimensional numerical model of the entire stratum is established using ABAQUS finite element software to predict the development characteristics of the frozen temperature field and verify it with field-measured temperature data. [Result & Conclusion] The average development speed of the clay layer frozen curtain is 54.535 mm/day, while the average development speed of the silty clay layer frozen curtain is 52.450 mm/day, indicating a better freezing effect of the former. Considering the relatively weak freezing effect at the end profile of the freezing pipe, the thickness of the weak-side frozen wall and the average temperature at that profile are adopted as the freezing effect evaluation indicators, thereby reducing the possibility of structural damage. The influence of brine temperature on the development of frozen wall thickness weakens with decreasing temperature, with the highest economic benefit observed between -30 ℃ and -35 ℃. The simulation results are consistent with the overall cooling trend of the field-measured data, providing a relatively realistic reflection of the actual construction process.
Authors and Affiliations
Haonan ZHAO, Caichu XIA, Xingkai WANG
Keywords
Related Articles
- EP ID EP727698
- DOI 10.16037/j.1007-869x.2024.01.015
- Views 46
- Downloads 0
Effect of Rubber Soil Backfill on Vibration Isolation of Open-cut Tunnels
［Objective］ During the operation of urban rail transit, the train operation induced vibration can damage buildings and precision instruments along the line, and even affect people's daily lives. Therefore, effective vi...
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...
Safety Envelope Management Method for Marshaled Trains Based on Time Delay Protection
[Objective] In flexible marshaled trains, the communication delay between the master railcar, subordinate railcar and ZC (zone controller) exhibits asynchrony, leading to potential issues such as overlapping, misalignmen...
Dynamic Response Analysis of Large Shield Tunnel Structure of Shanghai Urban Railway Airport Link under Train Load
Objective The prefabricated single hole double track large-diameter shield tunnels are more frequently applied in underground rail transit lines, improving the efficiency of underground space utilization. However, the we...
Research on Accessibility Evaluation Method for Urban Rail Transit Station Based on Shared Bicycle Connection
[Objective] The shared bicycle is an effective connection tool for urban rail transit station. It is necessary to establish an accessibility measurement model to evaluate the accessibility of urban rail transit stations...