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Empirisches Prognosemodell zur Bestimmung der Festigkeitsentwicklung von Spritzbeton
Author(s) -
Hammer AnnaLena,
Thewes Markus,
Galler Robert
Publication year - 2019
Publication title -
geomechanics and tunnelling
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.317
H-Index - 18
eISSN - 1865-7389
pISSN - 1865-7362
DOI - 10.1002/geot.201900054
Subject(s) - shotcrete , stiffness , geotechnical engineering , strength of materials , structural engineering , geology , materials science , engineering
Shotcrete is an essential support element in tunnelling. From the start of the hydration of shotcrete, it resists stresses and deformation. Therefore its time‐dependent material properties, in particular the strength development and stiffness development, are significant. With time, the early strength can affect the progress of rock pressure and the support resistance. In order to describe its mechanical material properties, there are models, mostly validated with data from dry‐mix shotcrete or older shotcrete mix designs. Continuous further development in additive technology has however considerable improved the performance of shotcrete in recent years. In this article, data from more recent test series and from practical projects are evaluated. Building on the evaluation of the strength curves, an empirical forecasting model is presented, which can be used for the qualitative estimation of shotcrete strength development.