Taking the construction of Xiamaixi Tunnel in Guiyang City Rail Transit No .1 Line crossing underneath the ring express highway for example and by using the elastic-plastic theory ,Mohr-Coulomb criteria and Mids-Gts software , the internal force of tunnel lining and the stress ,deformation and plastic area of surrounding rock during the construction were calculated and analyzed systematiclly and numerically ,and the differences between them under different supporting were compared .The results suggest that when the distance of the tunnel working face is 20 meters to the retaining wall , the supporting measures should be taken on ,especially the measures should be taken on for reinforcing the bottom as well as the southeast corner and southwest corner of the retaining wall .%以贵阳市轨道交通1号线下麦西隧道施工下穿环城高速公路交通涵出口挡土墙为例，采用弹塑性理论、摩尔库仑准则，利用 Midas Gts 软件系统数值分析施工过程中隧道衬砌内力和围岩的应力、变形和塑性区，对比不同支护形式时隧道衬砌内力、围岩塑性区等的差异。计算结果表明：在隧道开挖过程中，当隧道开挖到距离挡土墙位置20 m 时就应该对挡土墙采取支护措施，特别应加强挡墙的底部，东南角，西南角的加固措施。
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