Research on Stability Control Techniques for Excavation of Shallow Buried Tunnel with Unsymmetrical Pressure in High Slopes
This paper focuses on the stability control techniques for the excavation of shallow buried tunnel in high slopes,with the Jinci Tunnel as the engineering basis.Utilizing finite element software,numerical simulations of the bias tunnel are conducted to analyze the stability of the surrounding rock and slopes during the construction process.The study elucidates the settlement patterns of the tunnel arch and the stress distribution under different stress release rates.Based on these findings,numerical simulations are performed to analyze the slope-cutting backfilling remediation scheme.The results validate a significant reduction in the impact of unsymmetrical pressure on the overall deformation of the tunnel after slope cutting and backfilling.The adoption of the slope-cutting backfilling method effectively lowers the risk of instability in both the slopes and the tunnel during the construction of the Jinci Tunnel.Finally,real-time monitoring and numerical simulation comparative analysis are performed on the bias tunnel after the slope-cutting backfilling remediation.The study reveals distinct characteristics,such as'rapid initial settlement with large deformation,followed by gradual convergence with small deformation'in tunnel crown subsidence,tunnel arch convergence,and surface settlement.This validates the safety and effectiveness of the slope-cutting backfilling remediation measures in addressing the instability of shallow buried tunnel with unsymmetrical pressure in high slopes.
shallow buried tunnel with unsymmetrical pressuresettlement deformationslope cutting and backfillingnumerical analysisfield monitoring
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