The shield shafts of large-diameter highway tunnels play crucial roles during the construction stage,including shield machine hoisting,shield tunneling initiation,and reception.In the subsequent operation stage,they handle various tasks such as tunnel operation,equipment layout,troubleshooting maintenance and safety evacuation in case of accidents.This article takes Shenzhen Mawan Cross-sea Shield Tunnel as the re-search object,and designs the shield receiving shaft structure according to the characteristics of shield-driven un-derground expressway.The three-dimensional calculation model of the load-shaft structure is established using Midas Civil finite element software.The stress characteristics of the ring frame beam in the shield receiving shaft are analyzed during the shield hoisting stage,the post-construction pouring stage and the subsequent operation stage.The construction measures of the ring frame beam of the large-diameter shield shaft are also summarized.Those findings provide valuable guidance for the structural design and construction of large-diameter shield shafts.
Shield tunneling of highwayLarge-diameter shield wellsRing frame beam
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