For curved shield tunnels in composite strata. the excavation face may undergo sliding failure due to the interface effect of soil layers. the over-excavation of shield cutterhead. and the asymmetrical thrust of jacks. https://www.diegojavierfares.com/mega-super-Custom-Moulded-Cargo-Boot-Liner-Suits-Citroen-Grand-C4-Picasso-9-2006-On-Wagon-EXP-CARCRN00026-best-super/