Analysis of Land Subsidence Induced by Vertical Overlapping Tunnel Shield Construction
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 7
Abstract
Objective Due to the special construction method of overlapping tunnels, the formation of land subsidence troughs and the increase in stratum loss rate may affect the surrounding environment and buildings. Therefore, it is necessary to study the influence law of land subsidence in overlapping tunnel construction. Method Taking the completely overlapping tunnel section of Qinghe Xiaoyingqiao Sta.–Xuezhiyuan Sta. Interval on Beijing Subway Changping Line as example, combining numerical analysis and on-site monitoring data, a systematic study of land subsidence and stratum loss during shield overlapping tunnel construction is conducted. The impact of the construction sequence of the upper and lower line tunnels on the morphology of land subsidence troughs, the maximum subsidence values, and stratum loss rates is analyzed. Result & Conclusion There is a significant superposition effect in shield overlapping tunnel construction. The construction of upper line tunnel causes some amount of stratum loss and leads to an increase in the maximum land subsidence value. Under overlapping construction conditions, the stratum loss caused by the excavation of upper line tunnel is less than that caused by the separate construction of upper line tunnel without involving the overlapping construction situation. The stratum loss rate during overlapping tunnel construction is not affected by changes in tunnel buried depth, and there is little difference in stratum loss rate between single-line excavation and overlapping excavation. In similar geological conditions to this engineering, the stratum loss rate can be roughly estimated at 0.25%.
Authors and Affiliations
Zhendong LI
Keywords
Related Articles
- EP ID EP742601
- DOI 10.16037/j.1007-869x.2024.07.017
- Views 23
- Downloads 0
Smoke Exhaust Schemes for Metro Terminal Station Storage Tracks and Reserved Main Lines
[Objective] The smoke exhaust paths for metro terminal station storage tracks and reserved main lines are different from those for various auxiliary lines in middle stations, thus it is necessary to study suitable smoke...
Research on Rail Transit Vehicle Wheel Axle Locking Fault Prediction Model
Objective Improper assembly of wheel axles, excessive operation during maintenance leading to axle surface irregularities, or abrasions and defects caused by electrical corrosion during operation exacerbate abnormal faul...
Study on Deformation Control Value for Urban Rail Transit Foundation Pit Project
Objective Setting deformation control values for the monitored project and controlling the construction safety is a very important task in the construction of urban rail transit engineering, aiming to ensure the stabilit...
Design of Grounding Grid for Main Substations in High Soil Resistivity Areas Based on CDEGS Software
Objective To address the difficulty of reducing the grounding resistance of main substations in high soil resistivity areas, it is necessary to study the design of grounding grids for main substations in such regions. Me...
Passing Performance of Inverted T-shaped Frog Turnouts for Suspended Monorail Vehicles
[Objective] The suspended monorail transportation system holds promising prospects, yet researches on the dynamics performance of vehicle passing through turnouts remain relatively scarce, requiring comparison for furthe...