偏压连拱隧道围岩变形的现场监测与分析研究

结合宜(宾)水(富)高速公路鞋底坡双连拱隧道施工过程，通过对偏压连拱隧道的围岩变形进行现场监测与分析，获得了隧道围岩在地层偏压条件下。各施工阶段的地表沉降、拱顶下沉和水平收敛情况，有效地控制了隧道围岩变形。通过对量测结果的对比、分析得出：在偏压连拱隧道施工过程中，隧道初期支护变形整体由左洞向右洞方向偏移；对隧道围岩变形影响最大的工序发生在隧道旌工由单侧过渡到双侧施工时。在施工过程中偏压连拱隧道的现场测试与分析，不仅为隧道的支护体系设计优化提供依据，而且还可以指导隧道现场施工，所得的数据和结论可为同类隧道的设计，施工和研究提供有益的借鉴和参考。

Site Monitoring and Analysis Reseach on Surrounding Rock Deformation of A Biased Double-arch Tunnel

According to the Xiedipo double-arch tunnel engineering of the Yi-Shui(Yibin-Shuifu), by site monitoring and analyzing the deformation of the surrounding rock of the biased double-arch tunnel, the ground settlement, the vault subsidence and the horizontal convergence during each period of construction are obtained under the condition of the stratum bias and therefore the surrounding rock deformation is controlled effectively. By comparing and analyzing for measuring data the conclusions are that the deformation of the first support lining is deformed from the left tunnel to right tunnel during the construction of the biased double arch-tunnel;and that the most dangerous construction procedure of the tunnel deformation is from one side to the other side in the construction of the tunnel.The testing and the analysis of the biased double-arch tunnel during the construction is applied to guide tunnel construction and to optimize the supporting system. The monitored data and the experiences can be for reference in design, construction and research of similar tunnels.