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Author:
Ahmed, Lamis (KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures)
Ansell, Anders (KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures)
Title:
Structural dynamic and stress wave models for analysis of shotcrete on rock exposed to blasting
Department:
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures
Publication type:
Article in journal (Refereed)
Language:
English
Status:
Published
In:
Engineering structures(ISSN 0141-0296)(EISSN 1873-7323)
Volume:
35
Issue:
1
Pages:
11-17
Year of publ.:
2012
URI:
urn:nbn:se:kth:diva-58989
Permanent link:
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-58989
ISI:
000301217300002
Subject category:
Infrastructure Engineering
Keywords(en) :
Blasting, Numerical analysis, Rock, Sprayed concrete, Stress waves
Abstract(en) :

During blasting in tunnels and mines, the interaction between shotcrete (sprayed concrete) and rock is influenced by propagating stress waves. Shotcrete support in hard rock tunnels is studied here through numerical analysis using three different modelling approaches. The stress response in the shotcrete closest to the rock when exposed to P-waves striking perpendicularly to the shotcrete–rock interface is simulated. The first model tested is a structural dynamic model that consists of masses and spring elements. The second is a model built up with finite element beam elements interconnected with springs. The third is a one-dimensional elastic stress wave model. The models give comparable results, although the definition of the dynamic loads is different. The analysis results can be used to estimate whether the shotcrete will fail or not for a prescribed distance to detonating explosives inside the rock.

Note:
QC 20120402
Available from:
2012-01-12
Created:
2012-01-09
Last updated:
2012-04-27
Statistics:
77 hits