I want to overcore a drilled specimen from the field for triaxial testing. Now I need appropriate settings for the overcoring machine to get (nearly) undisturbed mudrock specimen.
Hi Christian,
both the feed rate and the rotational speed are so much different for different clay rocks and their orientation in respect to bedding planes. Unfortunately you need to try (trial and error). In any case you need to overcore dry which produced some heat if you do not cool properly with compressed air. Overcoring normal to the bedding plane orientation is a nightmare. I can give you some suggestions in case you find time to drop me an email.
Florian
Hello Florian,
we used water-flushing during overcoring and it worked pretty well. But the mudrock I investigate is massive and not laminated. I think that makes the preparation a lot easier. Our setup was a rotational speed of 900 revolutions/min with a forward speed of 0.03 mm/revolution.
Christian
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