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公路隧道复合式衬砌结构数值计算及分析

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Keywords: 隧道工程,公路隧道,数值计算,复合式衬砌,洞周位移,拱顶下沉,围岩塑性区

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Abstract:

？针对榆树沟隧道工程实际情况,选取了3种不同的复合式衬砌结构类型进行数值计算,对初期支护和二次衬砌的内力、安全系数及洞周位移、拱顶下沉、围岩塑性区的分布等进行了分析,评价了衬砌结构的安全性。结果表明:对于Ⅱ、Ⅲ类围岩,上台阶及下台阶中央区的开挖为施工的关键工序;对Ⅳ类围岩,上台阶开挖为施工的关键工序;在Ⅱ类围岩浅埋条件下,拱顶下沉主要是由上台阶的开挖及下台阶中央区的开挖所引起;在Ⅲ类以上围岩条件下,拱顶下沉绝大部分是由上台阶的开挖所引起;洞周位移较小,最大值为18mm,发生在Ⅱ类围岩浅埋拱脚处;围岩塑性区发展深度最大者,连通到地表,属于Ⅱ类围岩浅埋;Ⅲ类围岩墙脚处塑性区较大;Ⅳ类围岩塑性区较小。

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