海西环岛高铁颜春岭隧道富水浅埋,隧道全为V级围岩.隧道洞身穿越古火山口膨胀土火山灰挤压变形严重,围岩遇水软化成泥状,本文就膨胀火山灰富水变形段施工技术作以阐述供类似工程参考.%The water-rich shallow of Yanchunling tunnel of the rotary island high-speed rail in Haixi is V grade surrounding rock.The tunnel body passes through the ancient crater of expansive soil,and the deformation of the volcanic ash is serious.This paper expounds the construction technology of the expansive water-rich deformation section of the volcanic ash.
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