基于变形控制的凝灰岩隧道稳定性评判基准研究

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目的 针对绍兴特定地区,建立隧道施工围岩稳定性评判指标及控制基准.方法 采用数理统计方法,对已有的718个监测断面的拱顶沉降实测数据进行归纳总结,基于不同围岩等级及隧道埋深,从累积拱顶沉降与相对拱顶沉降两方面得到隧道围岩变形评判基准,然后考虑测前位移损失,通过数值模拟方法分析不同工法的拱顶沉降位移释放率,对评判基准结果进行修正.结果 不同施工方法的拱顶沉降位移释放率从大到小依次为全断面法、台阶法、单侧壁导坑法;累积拱顶沉降相对于设计预留变形量偏小,设计较保守;相对拱顶沉降随埋深变化呈交错变化规律,相同围岩级别的相对拱顶沉降分布区间较集中,随着围岩级别变差,分布区间范围越大.结论 提出绍兴地区凝灰岩隧道围岩变形评判基准双控指标及建议值,对后期类似地区隧道设计及施工具有重要指导意义.
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