大跨度无中导洞分岔隧道反挖施工关键技术研究

结合深圳东部过境高速公路连接线工程实际情况,提出了一种地下互通立交分岔节点矿山法隧道的反挖施工方法,用于不具备由大断面隧道段往分岔小断面隧道段施工的条件时,对隧道的地下互通立交分岔节点采用矿山法施工.该方法包括无中导洞连拱隧道施工、先导洞扩挖施工、主隧道反向开挖施工技术,可为类似的地层分岔隧道施工提供经验指导.

Research on Key Technology of Reverse Excavation Construction of Long-span Bifurcated Tunnel without Medium-pilot tunnel

Combined with the actual situation of the Shenzhen Eastern Transit Expressway Connecting Line Project, a reverse excavation construction method of the underground interchange bifurcated node mine tunnel is proposed, which is used to construct the underground interchange bifurcated node of the tunnel by the mine method when there is no condition for the construction from the large section tunnel section to the bifurcated small section tunnel section. This method includes the construction of multiple arch tunnel without medium-pilot tunnel, the expansion construction of pilot tunnel and the reverse excavation construction of main tunnel, which provides the experience guidance for the construction of the similar stratum bifurcated tunnels.