Characterisation of spalling fragments to obtain data for flow and solute transport in damaged zones
At the (A)sp(o) underground rock laboratory spalling was induced in part of walls of a 1.75 m diameter, 6.5 m deep hole in granite. A damaged wedge about 50 cm wide and 10 cm deep extended along the walls of the hole. The rock fragments were collected, in all about 176 kg, and their shapes and sizes, which ranged between a fraction of mm and tens of cm were measured. Frequencies of mass of different particle sizes as well as shapes of particles were determined The particles were typically flat slabs with a thickness 0.1 of the length. They were much thinner at the edges than in the middle. The width was about half the length or less. The data were used to estimate the specific surface of the fragments. This information was used to estimate the anisotropic hydraulic conductivity of the damaged zone. Particle shapes were used to estimate the tortuosity in the zone, which influences the effective diffusivity of solutes that migrate in the zone.
I.Neretnieks J.C.Andersson
Dept. Chemical Engineering, Royal Institute of Technology, KTH, Stockholm, Sweden Nuclear Fuel and Waste Management Co. SKB, Stockholm Sweden
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）