2005•Tunnel and Underground SpaceRequires access

A Study on Joint by Two-Stage Excavation in Tunnel

Byun Gwang-Wook, Joung-Hwan An, Kim Dong-Gab, Sang-Duk Lee

Abstract

Recently, the surrounding rock mass is understood as the major support system for the tunnel constructed in the rock mass. Generally, the rock mass contains many discontinuity planes such as joints, and thus, the tunnel behavior in the rock mass is governed by the characteristics of the discontinuity planes. In this study, the behavior of tunnel in jointed rock mass is studied by model tests and numerical analyses. The results shows that the behavior of tunnel depends on the different initial stress conditions, in case that the tunnel is excavated in the ground without any joints. When a joint is located near the tunnel, the pound stress and displacement tend to increase between the tunnel and the joint.

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Available abstract

Key concepts: Rock mass classification, Discontinuity (linguistics), Joint (building), Excavation, Geology, Geotechnical engineering, Displacement (psychology), Stress (linguistics)