Calculation Model of Safety Distance between Shield Tunnels and Underground Cavities in Water-Rich Sandy Cobble Stratum
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 12
Abstract
［Objective］ In order to ensure the shield tunnel construction safety in water-rich sandy cobble stratum when passing through underground cavities, it is necessary to study the safe distance between the shield tunnels and the underground cavities. ［Method］ Taking the tunnel project of Nanchang Metro Line 1 East Extension as an example, combining theoretical calculation and numerical simulation methods, a quantitative analysis is conducted on the safety distance between underground cavities and tunnels based on the catastrophe theory. The above-mentioned safety distance is calculated by combining the structural mechanics approximate analysis method, and a calculation model for the safety distance between the shield tunnels in water-rich sandy cobble stratum and the underground cavities is established. The rationality of the proposed calculation model is verified by the Abaqus software numerical simulation, taking whether the plastic zone of the rock-soil system between the underground cavity and the tunnel is connected as the criterion. ［Result & Conclusion］ The proposed calculation model for the safety distance between the shield tunnels in water-rich sandy cobble stratum and the underground cavities has certain accuracy and rationality and can be applied in engineering practice. The above-mentioned safety distance increases as the span of the underlying cavity increases, decreases as its height-to-span ratio increases, and increases as the level of surrounding rock influence factors increases.
Authors and Affiliations
Lihui XIE
Keywords
Related Articles
- EP ID EP752713
- DOI 10.16037/j.1007-869x.2024.12.008
- Views 9
- Downloads 0
Automatic Turn-back Scheme for City Railway Intervals Based on CTCS2+ATO Signaling System
［Objective］ When there is a malfunction or temporary operation schedule adjustment under public transit operational scenarios，the train turn-back in intervals is required for city railways using the CTCS2+ATO (Chinese...
Analysis Model of Urban Rail Transit Service Quality Influencing Variable Factors Based on SEM
Objective Aiming to further enhance urban rail transit service with precision, it is essential to quantitatively extract the influencing variable factors of urban rail transit service quality and analyze the intrinsic re...
Analysis and Application of Stratum Support Stress Under Action of Foundation Pit Retaining Pile
[Objective] Foundation pit retaining piles play a vital role in building construction. In order to ensure the safety and stability of foundation pit construction, it is necessary to make in-depth study on the stress dist...
New-generation Signaling System Construction Scheme Based on Cloud Architecture
[Objective] With the theme of promoting urban rail transit information, developing intelligent system, and building 'smart urban rail' for a highly integrated urban rail transit cloud platform is the direction of technol...
Settlement Control Techniques for Urban Rail Transit Station Entry/Exit Large Profile Pipe Jacking Engineering through Urban Roads
Objective To ensure the smooth implementation of urban rail transit station entry/exit pipe jacking construction project, it is essential to study the impact of ground settlement and explore settlement control measures f...