大跨公路隧道通过景区公路的施工与监测

万松岭隧道是连接西湖景区与南部地区的新建双向四东道公路隧道。穿越景区既有公路及海军干休所院区。隧道埋深浅，跨度大，地下水位高，既有公路交通量大，地面（路面）沉降要求严格。通过改进施工方法和加强监控量测，有效地控制了地表下沉，确保了公路运营的安全。本文介绍了该工程的施工方法及监测技术。

Construction and Monitoring of Large Span Highway Tunnel Crossing Underneath Highway in Scenic Resort

Wansongling Tunnel is a newly-built bidirectional four-roadway highway tunnel, which connects Xihu scenic resort and the south area. The tunnel crosses underneath an existing highway in scenic resort and the naval ranking rest home. The tunnel has such features as shallow overburden, large span, high ground water level, busy traffics of the existing highway and strict restrictions on the settlement of the ground surface and road surface. By means of improving the construction method and strengthening the monitoring and measurement, the settlement of the ground surface is effectively controlled and the operation safety of the highway is guaranteed. This paper introduces the construction method and the monitoring and measurement technologies of the tunnel.