Thank you again for your advice miningman.
One of the possibilities we are also considering is to proceed with the first couple of meters with percussion drilling, to about 5m above the workings and then use diamond drilling for the final 5m (with calcium carbonate in our drilling fluid).
This...
The holes will be between 28m and 60m.
The project is in South Africa in a remote area, so some flyrock won't be a problem. Hangingwall conditions are probably sandstone.
The last mining that took place in the area was in 1980, so we need to determine amongst others the hangingwall conditions...
Thank you for your response miningman. Much appreciated.
I am aware of the severity of methane explosions in general.
When doing rotary core drilling, one has drilling fluid/water constantly flowing at the drill-bit, which should prevent ignition. I am concerned about doing percussion drilling...
Good day
We are a geotechnical engineering company and we are busy with a project where we will need to do percussion drilling into old bord and pillar coal workings. We are concerned about the possibility of drilling into methane and are concerned that this might cause combustion. Can anyone...
How should one calculate the membrane correction for a triaxial test (CU or CD?
I am busy updating our calculation sheets, and for some reason this has been omitted from the older sheets.
Thank you in advance.
As far as I understand a shearbox test is a drained test(assumption that excess pore pressure is 0).
I do however have clients who require "quick undrained" tests on partially saturated soils.
This can surely, at best, be a total stress test?
Any recommendations on how quickly I should shear the...
Consolidated Undrained (CU) and consolidated drained (CD) tests only refer to the fashion in which the testing is conducted. The two will both provide you with effective strength parameters. As GeoPaveTraffic mentions, the CU is quicker to perform. The CU test also has the advantage that it...
