Structural dynamic and stress wave models for analysis of shotcrete on rock exposed to blasting
2012 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 35, no 1, 11-17Article in journal (Refereed) Published
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.
Blasting, Numerical analysis, Rock, Sprayed concrete, Stress waves
National CategoryInfrastructure Engineering
IdentifiersURN: urn:nbn:se:kth:diva-58989DOI: 10.1016/j.engstruct.2011.10.008ISI: 000301217300002ScopusID: 2-s2.0-82355187660OAI: oai:DiVA.org:kth-58989DiVA: diva2:477046
QC 201204022012-01-122012-01-092015-05-29Bibliographically approved