Research on the Construction Technology of Changing Open Excavation to Underground Excavation in the Shallow-buried Section of Huayingshan Tunnel
Taking the No.4 open cut tunnel of Huayingshan Tunnel on Xi'an-Chongqing High-speed Railway as an example,in order to reduce the damage to the original ecological slope vegetation,the arch cover method is adopted.Through field monitoring and finite element limit analysis,the construction mechanical properties of the initial support arch cover method are analyzed.The results show that the arch cover protective arch can limit the deformation of surrounding rocks and ensure the stability of construction;the pre-reinforced piles can stabilize the surrounding rocks at the side slope and the flank;the arch foot and the lower part of the tunnel are the key areas for deformation.The finite element analysis results are consistent with the site.According to the design for construction,the tunnel has successfully passed the open excavation section.
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