Study on Coordinated Stress Mechanism and Reasonable Construction Process of Proximity Tunnel-Type Anchorage and Tunnel
In order to study the construction sequence of main cable anchorage and tunnel of near tunnel bridge under complex geological and engineering conditions,taking actual engineering as an example,the paper uses the finite element numerical method,based on the method of increasing cable force,to analyze and study the bearing safety characteristics of the anchor structure,the interaction mechanism between the adjacent tunnel and the tunnel-type anchorage,and the construction process.The results show that the safety factor of anchor plug is more than 2.0,and the safety factor of surrounding rock stability is more than 4.0,which meets the re-quirements of the code.However,in the process of construction,the blasting vibration should be strictly con-trolled,the support strength of tunnel-type anchorage chamber should be strengthened,and the adverse ef-fect of construction on surrounding rock disturbance should be reduced.After the completion of the lower tun-nel construction,the construction process of the upper tunnel-type anchorage can reduce the impact of the ad-jacent construction on the tunnel-type anchorage,and also reduce the stress of the first construction tunnel,which is scientific and reasonable for the stress of the anchor plug structure.
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