Abstract
During running excavation works of the Inntaltunnel, poor drilling and blasting conditions have been recorded over long distances. Drillability of the rock mass has been determined by foliation of the Innsbrucker quartz phyllite and by its geotechnical character. In this paper bit wear and drilling velocity in correlation with main geological and mechanical properties are discussed. Apart from conventional mechanical rock properties (compressive and tensile strength. Young's modulus) a new property for toughness/brittleness referring to drillability has been introduced: the specific destruction work Wz. This new method makes it possible to understand the basic correlation between drilling velocity at the tunnel face and specific rock properties. Rock properties and drilling data of the Innsbrucker quartz phyllite are shown in correlation of schist foliation. -English summary
| Translated title of the contribution | Studies on the drillability and toughness of the quartz phyllite prevailing in the Innsbruck area |
|---|---|
| Original language | German |
| Pages (from-to) | 111-120,122 |
| Journal | Felsbau |
| Volume | 12 |
| Issue number | 2 |
| State | Published - 1994 |