RUCS: Rock Uniaxial Compressive Strength and Deformability Tests

  • Class: Samples, Amalgamated Specimens and Laboratory Test Scheduling
Heading Unit Type Example Description
LOCA_ID   ID 327-16A Location identifier
SAMP_TOP m 2DP 24.55 Depth to top of sample
SAMP_REF   X 24 Sample reference
SAMP_TYPE   PA U Sample type
SAMP_ID   ID ABC121415010 Sample unique global identifier
SPEC_REF   X 1a Specimen reference
SPEC_DPTH m 2DP 24.55 Depth to top of test specimen
SPEC_DESC   X Brown sandstone Specimen description
SPEC_PREP   X Prepared according to client instructions Details of specimen preparation including time between preparation and testing
RUCS_SDIA mm 1DP 86.7 Specimen diameter
RUCS_LEN mm 1DP 235.3 Specimen length
RUCS_MC % 1DP 3.7 Water content of specimen tested
RUCS_COND   X Natural, saturated, dried at 105 degC Condition of specimen as tested
RUCS_DURN mm:ss T 6:54 Test duration
RUCS_STRA MPa/s 1DP 0.5 Stress rate
RUCS_UCS MPa 3SF 16.8 Uniaxial compressive strength
RUCS_MODE   X Shear Mode of failure
RUCS_E GPa 3SF 221 Young’s modulus
RUCS_MU   2DP 0.32 Poisson’s ratio
RUCS_ESTR   X 0-50%UCS, 20MPa Stress level at which modulus has been measured
RUCS_ETYP   PA Secant or Tangent Method of determination of Young’s modulus
RUCS_MACH   X Denison 7225 Type of testing machine
RUCS_REM   X Specimen tested outside required 2.5-3.0 diameter to length ratio Remarks
RUCS_METH   X ISRM : Suggested method for determination of Uniaxial Compressive Strength Test method
RUCS_LAB   X ACME Laboratories plc Name of testing laboratory/organisation
RUCS_CRED   X UKAS 0000 Accrediting body and reference number (when appropriate)
TEST_STAT   X Checked Test status
FILE_FSET   X FS10 Associated file reference (eg test result sheets)

Notes - 2

  • Note that units and accuracy for UCS are not prescribed in ISRM and the conventional MPa to 3SF is adopted here. ISRM defines GPa to 3SF for Young?s modulus and as such this is also adopted. ISRM suggests 3 significant figures for Poisson?s ratio but conventionally this is reported to 2 decimal places and this has been adopted.
  • ISRM specifies stress rate MPa/s but most tests are performed at a rate of loading kN/s or kN/min, and sometimes under strain controlled conditions for deformability. The results should always be converted and reported as MPa/s where necessary.