By Clarence S. Ross (Author), Robert L. Smith (Author)

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Additional resources for Ash-Flow Tuffs: Their Origin, Geologic Relations and Identification and Zones and Zonal Variations in Welded Ash Flows

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2 Crystalline and Argillaceous Rock 19 plane new breaks emerged from certain parts if the stress field changed by tectonic events, glaciation, deglaciation or temperature changes. This yielded the wellknown secondary (“splay”) fractures that can make apparently intact raw blocks useless for the stone industry (Fig. 2). Naturally, the evolution of weaknesses in the earth crust continues. Thus, presently identified 4th order discontinuities can grow and propagate even for small changes of the local stress field and those of 3rd, 2nd and 1st orders can do the same if the regional stress fields are changed.

The primary value of the scheme is that it offers a possibility also for constructing companies and laymen to understand the general structural character of a rock mass. SKB has used a version of this categorization scheme that defines what structural elements can be accepted in repository rock. Their scheme distinguished between features that can be described as: • D1 Very large discontinuity, fault that must not intersect a repository. • D2 Large discontinuity, fracture zone, that may intersect a ramp or shafts of a repository but that must not intersect or interact with the parts of a repository where waste is disposed.

Pusch R, 1994. Rock mechanics on a geological base. Developments in Geotechnical Engineering, 767. Elsevier Publ. Co. ISBN: 0-444-89613-9. 1 What is Required? What is required from the host rock? A first and major requirement is that it must be possible to construct a repository in it, which means that the stability must be acceptable, a matter that is strongly dependent on the rock structure. A further structurerelated criterion is that there must be enough space to host canisters, implying that the spacing of major weaknesses in the rock must not be too small.

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Ash-Flow Tuffs: Their Origin, Geologic Relations and Identification and Zones and Zonal Variations in Welded Ash Flows by Clarence S. Ross (Author), Robert L. Smith (Author)


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