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以福建省九龙江北引引水隧道下穿铁路线为研究对象,采用软件FLAC3D分析双洞引水隧道的下穿开挖对鹰厦铁路双线、厦深高铁双线的铁路路基的影响,通过模拟路基未加固和加固2种工况下,隧道单线贯通及双洞贯通后的路基的沉降情况.计算结果表明:最大沉降位于两隧道中心线正上方,路基未加固:右洞开挖对路基沉降的贡献64%左右,左洞贡献36%左右;路基加固:线开挖对路基沉降的贡献66%左右,左洞贡献34%左右.对比实测数据较为一致,证明拟合较好.
Taking the underpassing railway line of diversion tunnel of Jiulongjiang north of Fujian Province as the research object, the software FLAC3D was used to analyze the influence of the underpassing excavation of the double-hole diversion tunnel on the railway subgrade of the double lines of Ying-Xia railway and Xiamen-Shenzhen high- The results show that the maximum settlement is located just above the center line of the two tunnels and the subgrade is not reinforced: the contribution of right tunnel excavation to subgrade settlement About 64%, left hole contributed about 36%; roadbed reinforcement: the contribution of line excavation subgrade settlement about 66% contribution left about 34%.