碎裂岩体双洞隧道车行横洞交叉过渡施工技术

Construction Technology of Transverse Connective Adit Between Two Main Tunnels in Cataclasite Rock

以在建的雅康高速公路前碉3#碎裂岩体双洞隧道车行横洞交叉过渡施工为背景,运用现场踏勘、理论分析、优化验证方法等手段,对隧道工程条件和隧道空间结构进行了分析。提出了正洞与车行横洞交叉口拱顶塌腔预处理,门架及超前大管棚强加固的方法,确定了"先横洞,再过渡段,后正洞"的整体开挖与支护工序及其相应施工参数。实践表明,提出的碎裂岩体双洞隧道车行横洞交叉过渡施工方案及技术能够确保工程安全和进度,可以作为本工程的指导依据,也可为类似工程提供参考。

Taking the construction technology of transverse connective adit between two main tunnels of Ya＇an-Kangding highway in No.3 cataclasite rock as background,the tunnel engineering conditions and tunnel space structure were analyzed by applying the methods of site reconnaissance,theory analysis and optimization verification.The pretreatment of caving collapse at the crown hole was used for the intersection of main tunnel and adit.The door frame and advance pipe roof reinforcement were proposed.The whole excavation and supporting process and relevant construction parameters were determined.The sequence is construction adit first,then transition action,after main tunnel.Practice show that the proposed construction scheme and technology can ensure the security and progress of construction,and can be regard as a reference for similar engineering.