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边界非对称条件下圆形隧道围岩弹性解析

, PP. 73-81

Keywords: 隧道工程,围岩弹性解,源-汇法,非对称边界

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Abstract:

?为修正实际工程隧道计算分析中采用无限边界条件带来的计算误差,针对浅埋偏压隧道的边界非对称问题展开研究,提出了一种基于边界非对称情况下的浅埋隧道围岩弹性解析解。采用Sagaseta的方法,通过在隧道斜面边界对称位置设置镜像源来求解不同边界条件下的隧道围岩力学问题,并分析了不同参数对计算结果的影响。研究结果表明:斜边倾角越大,临边距离越小,隧道埋深越浅,则由边界条件产生的效应越大;忽略斜边边界会低估地表沉降值。

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