Tunnel Deformation Behavior due to Ground Surface Excavation above the Tunnel

Abstract

To establish an adequate evaluative method of existing tunnel deformation behaviors due to ground surface excavation above the tunnels, case studies of 23 tunnels' field measurement data and numerical parametric analyses using two dimensional FEM have been conducted. To sum up the contents; 1) Cracking of tunnel lining are roughly Tunnel deformation behaviors consist mainly of B/2 (h+D) (B: excavation width, D: tunnel diameter), lining rigidity, ground rigidity, contact condition between ground and tunnel lining, and ground initial stress K0.

Proposal of Guideline for Judgment of Adjacent Level on Adjacent Construction of Existing Tunnels

“…So far, we have studied a method to predict the adverse effects of adjacent embankment or cutting construction on existing tunnels through anecdotal surveying [2,3] and numerical analysis [2,4]. The aim of this study was to quantify a judgmental standard and establish an evaluation method for the adverse effects caused by construction adjacent to tunnels.…”