The Application of Shotcrete in the NATM (Operating equipment, payment provisions and practical example)

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Title: The Application of Shotcrete in the NATM (Operating equipment, payment provisions and practical example)

Author(s): W. Mayrhauser

Publication: Special Publication

Volume: 54

Issue:

Appears on pages(s): 297-322

Keywords:

Date: 1/1/1977

Abstract:
The NATM is a double shell building mehtod consisting of the shotcrete outer arch (reinforced by welded wire fabric and steel rib sections) and the systematically anchored rock carrying ring. The rock carrying ring is the primary supporting element and thus of the greatest importance. These two shells - the shotcrete outer arch and the rock carrying ring - have to be dimensioned in such a manner that the gound reaches a permanent equilibrium. To ascertain this, extensive measuring is required. These measurements are a fundamental criterion of the NATM and consist of: a) Roof conolidation bolts b) Convergency measurements c) Extensometer measurements d) Measuring anchors. These measurements are taken continuously in the course of the advance on site.