Stability Analysis on the Intersection Area of Subway Tunnels by Observational Method

계측에 의한 지하철터널 교차부의 안정성 검토

  • Published : 2005.02.01

Abstract

The stability of the intersection area of two tunnels is analyzed by observational method. The depth from ground surface to the intersected area is shallow and the geology around the area consists of soil and/or weathered rock. The tunnel is supported by reinforced protective umbrella method with 12 m long 3-layer steel-pipes and the intersected area is additionally reinforced with 6 m long rockbolts. The measured displacements are converged and mechanical stability of the intersected area of two tunnels is confirmed; tunnel arch settles to 6-7 mm at the crown and the sidewalls converges to about 5 mm. So based on the displacement measurements, the supporting system for the tunnel intersection proves to be effective to not only reduce the deformation of tunnels but also maintain the stability of tunnels.

Keywords

intersection of two tunnels;reinforced protective umbrella method;observational method;converged displacement;stability of tunnels

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