The effect of CRD method and auxiliary construction on surface settlement in shallow-buried tunnels

Several engineering practices have shown that the excavation of shallow-buried tunnels beneath major roads, as well selection appropriate measures and construction methods, has a significant impact on road surface settlement. Therefore, field monitoring numerical simulation are adopted in this study to analyze effect cross diaphragm (CRD) method settlement for under-construction Yüan 1 railroad tunnel. The findings show during four divisions CRD tunnels, amount caused by part accounts 40% total settlement, followed 3, accounting 30% difference between parts 2 4 is insignificant, with slightly larger than 4. main influence 0.64–0.86 times cavity diameter from tunnel median, within which final same horizontal range, beyond prone dramatically decline. By applying advanced grouting adjusting based data, can be controlled.