隧道初期支护力学行为研究

葛 欣
中国五冶集团有限公司

摘要

研究隧道初期支护结构受荷及变形情况,并进行时空效应分析,对隧道设计及现场施工具有一定的指导意义｡通过现场埋设监测元件,研究了隧道初期支护变形､围岩与钢拱架间接触压力､钢拱架内力演化规律,结果表明:(1)采用台阶法施工时,下台阶开挖是隧道施工控制的重点阶段｡应及时浇筑仰拱,使初支尽早封闭成环,以减缓初支变形,抑制内力发展;(2)相较初支变形,围岩与拱架间接触压力､拱架轴力､拱架弯矩表现出力的稳定滞后现象;(3)围岩与拱架间接触压力及拱架内力沿断面分布不均,两侧不对称｡左､右两洞平行开挖时,同一断面紧邻侧接触压力较大｡钢拱架大部分偏心受拉,局部偏心受压｡拱架弯矩随时间增长存在正､负号转换现象｡

关键词

隧道;初期支护;接触压力;钢拱架轴力;钢拱架弯矩

参考

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