GB/T 40961-2021Calibration methods of rock triaxial testing apparatus (English PDF)
岩石三轴试验仪校验方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 26, 2021
Implementation date
June 1, 2022
Scope
GB/T 40961-2021 is the English-translated version of 岩石三轴试验仪校验方法.
GB/T 40961-2021 describes how to calibrate the rock triaxial testing apparatus, the machine that measures the strength and deformation of rock specimens under equal lateral pressure.
It covers the calibration performance of the loading device, the load indicating device and the extensometer, the calibration equipment and environmental conditions, the checks before calibration, the calibration of each device, and how results are reported and how often calibration is repeated.
It applies to apparatus with an axial rated load of 500 kN to 5000 kN and a lateral rated load of 20 MPa to 150 MPa, and can be used as a reference for triaxial creep testers.
Informative annexes give the common symbols and units, a calibration record format and a certificate format. It was issued on 26 November 2021 and has applied since 1 June 2022.
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Document preview — GB/T 40961-2021
National Standard of the People's Republic of China
- ICS
- 27.140
- Classification
- P 55
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Check performance
- 4.1 Loading device
- 4.2 Load indicating device
- 4.3 Extensometer
- 5 Calibration method
- 5.1 Calibration equipment
- 5.2 Checking environmental conditions
- 5.3 Check before calibration
- 5.4 Loading device verification
- 5.5 Check of load indicating device
- 5.6 Extensometer calibration
- 6 Calibration results and calibration cycle
- 6.1 Check result
- 6.2 Calibration cycle
- Appendix A (informative) Commonly used symbols, units and instructions for calibration of rock triaxial tester
- Appendix B (Informative) Verification record format of rock triaxial tester
- Appendix C (informative) The format of the calibration certificate of the rock triaxial tester and the format of the calibration result notice
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.
1 Scope
This document describes the calibration performance, calibration method, calibration result and calibration cycle of the rock triaxial tester.
This document is applicable to rocks with an axial rated load of 500kN~5000kN and a lateral rated load of 20MPa~150MPa.
Shaft tester calibration. Refer to the calibration of the rock triaxial creep tester.
2 Normative references
The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 2611-2007 General technical requirements for testing machines
GB/T 36416.1 Testing Machine Vocabulary Part 1: Material Testing Machine
JJF1096 Extensometer Calibrator Calibration Specification
JJG762 Extensometer
3 Terms and definitions
The following terms and definitions defined in GB/T 36416.1 apply to this document.
3.1 Rock triaxial testing apparatus; triaxial instrument
A testing machine for testing the strength and deformation characteristics of rock specimens under the three-dimensional stress state of equal lateral pressure (sigma2=sigma3).
Note: Consists of axial and lateral loading devices, load indicating devices and deformation measuring devices. Refer to Appendix A for symbols, units and instructions commonly used in triaxial instrument calibration.
3.2 Extensometer
When the triaxial instrument exerts a load on the rock specimen, the specimen deformation measuring device is composed of a deformation sensor and a deformation display unit.
3.3 Resolution
The test machine indicating device that can effectively distinguish indicates the smallest difference between the indicated values. [Source: GB/T 36416.1-2018, 6.40]
3.4 Standard dynamometer
A force measuring instrument for verification, calibration, comparison, and transfer of standard force values.
3.5 Division value
Indicates the difference between the magnitudes represented by two adjacent scale lines on the scale of the indicating device.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
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Related Standards
GB/T 36416.1-2018 — Testing machine vocabulary—Part 1: Material testing machines
JJF 1096-2002 — Calibration Specification for Calibrator of Extensometers
JJG 762-2007 — Extensometer
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