Application of combined advanced support technology in the shallow,soft rock and underwater highway tunnel

Liuyanghe tunnel is the shallow,soft rock and underwater road tunnel by the mining method,and the combined advanced support technology was applied,including full-sectional grouting,pipe roof,and small duct.Firstly,a finite element model was established to analyze crown settlement and maximum axial force of the initial lining without the advanced support,with the full-sectional grouting support or the combined advanced support;then,the practical technical parameters of the combined advanced suppo...