ANALYSIS OF STEEL FRAME REMOVAL OF THREE STEPS TEMPORARY INVERT IN LONG-SPAN TUNNEL
In the section with poor construction conditions such as biased section and weak rock stratum,the three-step temporary invert with temporary steel frame method is generally adopted for construction.The excavation of the next step with the three-step temporary invert with temporary steel frame method requires the removal of the temporary support of the previous step,and the removal sequence of the temporary support has a great influence on the stress of the tunnel lining structure. Through the numerical simulation calculation of the construction process of the temporary steel frame with the three-step temporary invert method,the initial tunnel support deformation under different removal sequences of the temporary steel frame is analyzed,and the reasonable removal sequence of the temporary steel frame is determined according to the comparison and analysis of the on-site monitoring and measure-ment data,providing theoretical guidance for engineering practice.
large span tunnelthree-step temporary invert methodtemporary support
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