Comparison between blasting and wire sawing regarding hydraulic properties of the excavated damaged zone in a Tunnel – Experiences from crystalline rock at the Äspö hard rock laboratory, Sweden
Paper in proceedings, 2018

In tunneling with blasting, the tunnel periphery could be damaged (the EDZ, "Excavated Damaged Zone") with altered mechanical, hydraulic properties and reoriented stresses. In recent underground infrastructure projects, diamond wire cutting is used as an alternative excavation method. At the Äspö Hard Rock Laboratory in Sweden investigations have been conducted to determine hydraulic properties of the EDZ at water saturated conditions. Comprehensive hydraulic testing (hundreds of injection tests), in the floor of a blasted as well as a wire sawn tunnel section has made it possible to quantitatively compare hydraulic properties of the different excavation methods. Diamond wire cutting, as expected, greatly reduces the EDZ permeability compared to blasting.

Author

Lars O Ericsson

Chalmers, Architecture and Civil Engineering, GeoEngineering

P. Vidstrand

Swedish Nuclear Fuel and Waste Management Company

R. Christiansson

Swedish Nuclear Fuel and Waste Management Company

M. Morosini

Swedish Nuclear Fuel and Waste Management Company

52nd U.S. Rock Mechanics/Geomechanics Symposium

52nd U.S. Rock Mechanics/Geomechanics Symposium
Seattle, USA,

Subject Categories

Mineral and Mine Engineering

Geophysical Engineering

Geotechnical Engineering

More information

Latest update

1/9/2019 4