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咀头隧道进口DK82+666～DK83+270段,因此段隧道埋深浅且位于上第三系粉细砂岩与泥岩中,由于拱部砂岩成岩性差,胶结不良且含水,导致下部泥岩软化,初期支护已完段出现开裂下沉、向内挤压变形。为解决上诉问题以本座隧道为例,分析粉细砂岩隧道浅埋段地表旋喷桩加固措施的应用及效果。
Tsui tunnel entrance DK82 +666 ~ DK83 +270 section, so the section of the tunnel buried shallow and located in the Upper Tertiary fine sandstone and mudstone, due to poor diagenesis of arch sandstone, poor cementing and water, resulting in lower mudstone softening, the initial branch Guard has finished the segment sinking sinking, inward extrusion deformation. In order to solve the appealing issue, this tunnel is taken as an example to analyze the application and effect of surface grouting pile reinforcement measures in the shallow buried section of fine sandstone tunnel.