Study on the Face Stability of a Metro Tunnel in a Silty Clay Layer Constructed Using the Full-Face Method

The horizontal displacement of the soil at face subway tunnel is symmetrically distributed along central axis tunnel, which larger in middle and smaller both sides. related to size excavation face. If area too great, will be large, easily leading collapse. For this reason, builders often use core-keeping ring-cut method build tunnels. A large section divided into several small sections reduce caused by excavation. With continuous promotion application mechanized construction field tunnels, full-section gradually performed urban Once change from full-face made, issue how maintain stability working (especially soft stratum) becomes focus attention. Taking silty clay as research object, paper studies law core with regard under condition using theoretical analysis, numerical simulations, outdoor tests. According results, extrusion main cause displacement. We optimize parameters glass fiber anchors strengthen provide guidance for safe