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A method to downscale joint surface roughness and to create replica series using 3D printed molds
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2017 (Engelska)Ingår i: 13th ISRM International Congress of Rock Mechanics, International Society for Rock Mechanics , 2017Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

In order to determine the in-situ shear strength of rock joints, large scale testing is required. However, this is both expensive and difficult to execute. One possible method to overcome this may be to use photogrammetry to capture large joint surface roughness in-situ and downscale it to replica samples, which could be sheared in laboratory. In this paper, as a first part in such a method, a technique to digitize surface roughness and to produce replica samples for laboratory shear testing from a larger joint sample are presented. First, a thin granitic rock slice with dimensions of 1.75 m x 0.95 m of granitic intact rock was chosen for the study. The joint surface is fresh and created through tensile induced splitting. The large joint sample is digitized using photogrammetry. Then, one fullscale 1.7 m x 0.6 m geometry is cropped from the digitized joint geometry and then subsamples at 10x, 7.5x, 5x, 2.5x and 1x scales. All sub-geometries are scaled down digitally to produce 0.17 m by 0.06 m geometries. The geometries are used to make casting molds both positive and negative to produce samples with perfect matedness. The casting molds are 3D printed in polylactic acid plastic and C60/75 concrete is cast to produce a replica series. In addition to the creation of this replica series, two pilot replicas are also tested using a portable shear box with a 0.5 MPa normal pressure. The results from the pilot rounds are presented and discussed. Finally, suggestions for future research are given.

Ort, förlag, år, upplaga, sidor
International Society for Rock Mechanics , 2017.
Nyckelord [en]
3D printing, Concrete, Crack, Fracture, Joint, Photogrammetry, Replica, Shear Box, 3D printers, Concretes, Cracks, Geometry, Joints (structural components), Molds, Rock mechanics, Rocks, 3-D printing, Joint surfaces, Large scale testing, Normal pressure, Polylactic acid plastics, Situ shear strengths, Surface roughness
Nationell ämneskategori
Mineral- och gruvteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-227818Scopus ID: 2-s2.0-85044164305ISBN: 9781926872254 (tryckt)OAI: oai:DiVA.org:kth-227818DiVA, id: diva2:1209904
Konferens
13th ISRM International Congress of Rock Mechanics 2015, 10 May 2015 through 13 May 2015
Anmärkning

QC 20180524

Tillgänglig från: 2018-05-24 Skapad: 2018-05-24 Senast uppdaterad: 2018-05-24Bibliografiskt granskad

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Johansson, Fredrik

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