Estimation of deformation and stiffness of fractures close to tunnels using data from single-hole hydraulic testing and grouting
Description:
Sealing of tunnels in fractured rocks is commonly performed by pre- or post-excavation grouting. The grouting boreholes are frequently drilled close to the tunnel wall, an area where rock stresses can be low and fractures can more easily open up during grout pressurization. In this paper we suggest that data from hydraulic testing and grouting can be used to identify grout-induced fracture opening, to estimate fracture stiffness of such fractures, and to evaluate its impact on the grout perform…
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Date:
May 1, 2010
Creator:
Fransson, A.; Tsang, C.-F.; Rutqvist, J. & Gustafson, G.
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