Hydraulic Investigations of the Excavation Disturbed Zone

Start date 01/06/2011
End date The project is closed: 31/12/2013

​In order to increase the understanding of hydraulic features in the zone around a tunnel affected by blasting (the EDZ), investigations are performed at the Äspö Hard Rock Laboratory, Sweden. The general aim is to contribute to a safety and assessment analysis of a nuclear waste repository with realistic figures of hydraulic properties in an EDZ. In the project, samples and drilling cores have been taken from slabs sawn out of the tunnel walls. Fracture surveys in the slabs have been made with the aid of penetrants, digitisation and 3-D modelling. The sampled cores have been examined with regard to fracture transmissivity (in a triaxial cell permeameter), microfracturing and matrix porosity. In addition, in situ measurements have been made in the form of hydraulic tests directly in tunnel walls. Comprehensive geophysical and hydrogeological investigations now focus on tunnel floors. DFN-modelling nearby tunnels may be improved if the features are classified into induced, natural open, natural closed, healed fractures, and combined with representative T-values.


The project is carried out at the Division of GeoEngineering, research group Engineering Geology.

Project members

Project leader
Lars O Ericsson

Project members
Lars O Ericsson
Christian Butron

Lars O Ericsson

Chalmers Areas of Advance
​Built Environment

Page manager Published: Mon 28 Oct 2013.