渗水对泥页岩隧道围岩稳定性的影响及应对措施

The Seepage Effect on Stability of Surrounding Rock of Shale Tunnel and Its Countermeasures

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。

For the Yunshan tunnel outlet across the seepage shale formation under the condition of construction,by adopting appropriate measures,arch collapse,arch deformation,early cracking and other problems in the subsequent tunnel construction have effectively prevented. On the basis of the regression analysis of measurement data from third party monitoring unit,vault displacement rate is between 0. 00 ~ 1. 24 mm,the peripheral convergence displacement rate between 0. 00 ~ 1. 14 mm /d,displacement rate and the total displacement are within the allowable range,the exponential function u = a · e- b / tis specified on vault,peripheral convergence displacement and time curve fitting,regression curve with smooth convergence has been obtained,curve is normal and has certain reference significance for design and construction of tunnel with similar geological conditions.