Disturbance analysis of shield tunneling in clay and limestone composite strata using EDEM simulation
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View abstract on PubMed
Summary
This summary is machine-generated.Shield tunneling in complex clay-limestone strata causes increased ground settlement. An improved Peck formula accurately predicts surface settlement in these composite formations, aiding future rail transit projects.
Area Of Science
- Geotechnical Engineering
- Tunneling Engineering
- Computational Mechanics
Background
- Shield tunneling is crucial for urban rail transit, often encountering complex composite strata.
- Understanding ground disturbance in layered formations like clay-limestone is challenging.
Purpose Of The Study
- To investigate the settlement rules of clay-limestone composite strata during shield tunneling.
- To develop an improved predictive model for surface settlement in such conditions.
Main Methods
- Utilized EDEM (Extended Discrete Element Method) simulations for shield tunneling in composite formations.
- Analyzed transverse and longitudinal settlement under varying stratification coefficients.
- Modified Peck's empirical formula for composite strata settlement prediction.
Main Results
- Ground settlement (horizontal and longitudinal) increases with the stratification coefficient.
- Maximum lateral displacement and longitudinal displacement doubled as the coefficient rose from 0.2 to 0.8.
- Settlement patterns were observed along the tunnel axis and during the shield passage.
Conclusions
- The study reveals the disturbance laws of clay-limestone composite strata during shield tunneling.
- The modified Peck formula provides accurate predictions, aligning with simulations and measurements.
- Findings offer theoretical support for shield construction in similar geological conditions.
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