Abstract：Shed-pipe combined with grouting technology，one of the advanced support patterns in underground engineering，is often used in the excavation of tunnel by shallow-underground cut method. However，papers about the support mechanism and quantitative analysis of the support effect of shed-pipe and grouting technology are scarce. First，efforts are made to explore the support mechanism of the shed-pipe and grouting technology in the excavation of shallow-buried and surrounding soft rock. Then，examples of tunneling construction of the weathering and crushed zone of the exit of certain double-arch tunnels are presented. By the fast language analysis of continua (FLAC) simulating of the stress field，the displacement field of the surrounding rock，and support structure in two conditions (without and with shed-pipe grouting)，the papers present a quantitative analysis of the support effect of the sheet pile grouting technology. Finally，the conclusions are obtained as following：(1) shed-pipe grouting technology can considerably improve the stability of the surrounding rock；(2) it can dramatically reduce the deformation and load of the support structure of the tunnel；and (3) it can avoid cave while excavating in shallow-buried and soft ground，as a good advanced support technique.
