Testwork: Unconfined compressive strength - Revision history

Alex Doll: /* Test Outputs */

2016-07-29T15:46:47Z

Test Outputs

Alex Doll: /* Test Outputs */

2015-07-24T19:33:16Z

Test Outputs

Alex Doll: /* Test Outputs */

2015-05-19T17:11:26Z

Test Outputs

Alex Doll: Alex Doll moved page Testwork: Unconfined compressive strnegth to Testwork: Unconfined compressive strength without leaving a redirect: spelling mistage

2015-05-19T17:01:52Z

Alex Doll moved page Testwork: Unconfined compressive strnegth to Testwork: Unconfined compressive strength without leaving a redirect: spelling mistage

Alex Doll: Created page with "category:Testwork category:Geotechnical tests ==Testwork: Unconfined compressive strength== {{Test|name=Unconfined compressive strength|Abrev=UCS|Alt=|F80=100 mm|P80=2..."

2015-05-19T17:01:31Z

Created page with "category:Testwork category:Geotechnical tests ==Testwork: Unconfined compressive strength== {{Test|name=Unconfined compressive strength|Abrev=UCS|Alt=|F80=100 mm|P80=2..."

New page

[[category:Testwork]]
[[category:Geotechnical tests]]
==Testwork: Unconfined compressive strength==
{{Test|name=Unconfined compressive strength|Abrev=UCS|Alt=|F80=100 mm|P80=20 mm|Models=}}

Unconfined compressive strength is a standard measurement of rock competency and is often used to determine rock mass rating (RMR) and slope stability for pit walls.

The test is a 'per-specimen' test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus. Typically one carefully prepared specimen is chosen to represent a sample and the result reported includes a subjective comment like "good fracture" or "invalid-fracture failure".

===Sample Requirements===

The test requires 1 cylindrical piece of large diameter (typically PQ) drill core, minimum length 150 mm.

===Test Inputs===

Not applicable.

===Test Outputs===

SAGMILLING.COM uses only metric units of MPa. If the laboratory reports UCS in other units (such as psi), convert the results before entering.

The laboratory will report the following information:
* N° specimens: The number of specimens tested (typically 1)
* min The value of the specimen with the lowest result (if applicable)
* max: The value of the specimen with the highest result (if applicable)
* stdev: The standard deviation of value of all the specimens (if applicable)
* ucs: The arithmetic average of the metric work index of all the specimens
* density: The water-displacement density of the specimens prior to testing, in kg/L (also referred to as 'specific gravity')

=== Modelling ===
Unconfined compressive strength is not used directly in any SAGMILLING.COM models. Literature suggests it can occasionally be used as a proxy for the
Bond crushing work index if a suitable calibration sample set exists for an ore.

The UCS reflects the energy requirement to break rocks in the coarse size range, from >100 mm down to about 10 mm - 20 mm.

@@ Line 22: / Line 22: @@
 The laboratory will report the following information:
 * <b>N° specimens:</b> The number of specimens tested (typically 1)
-* <b>min</b> The value of the specimen with the lowest result (if applicable)
+* <b>min</b> The value, MPa, of the specimen with the lowest result (if applicable)
-* <b>max:</b> The value of the specimen with the highest result (if applicable)
+* <b>max:</b> The value, MPa, of the specimen with the highest result (if applicable)
 * <b>stdev:</b> The standard deviation of value of all the specimens (if applicable)
 * <b>ucs:</b> The arithmetic average of the UCS in MPa of all the specimens

@@ Line 26: / Line 26: @@
 * <b>stdev:</b> The standard deviation of value of all the specimens (if applicable)
 * <b>ucs:</b> The arithmetic average of the UCS in MPa of all the specimens
 === Modelling ===

@@ Line 25: / Line 25: @@
 * <b>max:</b> The value of the specimen with the highest result (if applicable)
 * <b>stdev:</b> The standard deviation of value of all the specimens (if applicable)
-* <b>ucs:</b> The arithmetic average of the metric work index of all the specimens
+* <b>ucs:</b> The arithmetic average of the UCS in MPa of all the specimens
 === Modelling ===