山东大学学报 (工学版) ›› 2024, Vol. 54 ›› Issue (3): 81-93.doi: 10.6040/j.issn.1672-3961.0.2023.043
• 土木工程 • 上一篇
罗彦斌,王思涵,陈建勋,王传武*
LUO Yanbin, WANG Sihan, CHEN Jianxun, WANG Chuanwu*
摘要： 针对深埋小净距隧道围岩压力计算存在中夹岩柱安全系数取值不准确的问题,从隧道施工过程中先行隧道开挖支护完成,后行隧道开挖但支护结构尚未闭合的状态出发,计算中夹岩柱极限承载力,采用强度折减法计算中夹岩柱安全储备系数,推导中夹岩柱对小净距隧道围岩压力分担作用表达式,建立考虑中夹岩柱安全储备的深埋小净距隧道围岩压力计算方法,通过算例验证该方法的合理性,分析净距对隧道围岩压力的影响。研究结果表明:本研究提出的围岩压力计算方法考虑了岩体参数、隧道跨度、工法等因素对中夹岩柱安全储备系数的影响,能更准确反映中夹岩柱对小净距隧道围岩压力的分担作用,某单洞四车道公路隧道Ⅳ级围岩段修正的中夹岩柱承载力为10 324 kN/m,拱顶竖向围岩压力为264 kPa;某两车道公路隧道Ⅴ级围岩段修正的中夹岩柱承载力为2 430 kN/m,拱顶竖向围岩压力为251 kPa。修正算法均实现了对实测围岩压力的包络,并且较规范值分别减小了6%和29%。根据本研究提出的算法,Ⅲ级围岩段四车道、三车道、两车道隧道围岩压力不受小净距影响的临界净距分别为0.6B4lanes、0.7B3lanes、0.7B2lanes,Ⅳ级围岩段分别为1.2B4lanes、0.9B3lanes、0.9B2lanes,Ⅴ级围岩段三车道和两车道隧道临界净距分别为1.8B3lanes和1.2B2lanes。
中图分类号:
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