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云山隧道出口端在穿越渗水泥页岩地层条件下的施工中,通过采取应对措施,有效地防止了在随后的渗水泥页岩地层隧道施工中拱顶坍塌、拱架变形、初支开裂等问题。根据第三方监控单位各断面量测的数据进行回归分析的结果显示,拱顶下沉位移变化速率在0.00~1.24 mm之间,周边收敛位移变化速率在0.00~1.14 mm/d之间,位移速率与累计位移量全部在允许范围内,采用指定的指数函数u=a·e-b/t对拱顶下沉、周边收敛位移与时间曲线进行拟合,得到光滑收敛的回归曲线,曲线走势正常,对以后类似地质条件下隧道的设计与施工有一定的参考意义。
In the construction of Yunshan tunnel exit end through penetrating shale formation, by adopting countermeasures, it is effective to prevent collapse of dome, deformation of arch, cracking of first branch and so on during subsequent tunneling of seepage shale formation problem. The results of regression analysis based on the measured data from each cross-section of the third-party monitoring unit show that the rate of change of dome-sinking displacement is between 0.00 and 1.24 mm and the rate of perigee convergence displacement is between 0.00 and 1.14 mm / d. The displacement velocity And the accumulated displacements are all within the allowable range, fitting the vault sinking, the surrounding convergence displacement and the time curve by using the specified exponential function u = a · eb / t to obtain the smooth convergence regression curve, the curve is normal, After similar geological conditions of the tunnel design and construction of a certain reference value.