DZ/T 0276.21-2015Regulation for testing the physical and mechanical properties of rock. Part 21: Test for determining the tensile strength of rock (English PDF)

Foreword

DZ/T 0276 "Testing Procedures for Physical and Mechanical Properties of Rocks" is divided into 31 parts.

--- Part 1. General and general provisions;

--- Part 2. Rock moisture test;

--- Part 3. Rock particle density test;

--- Part 4. Rock density test;

---Part 5. Rock water absorption test;

---Part 6. Rock hardness test;

--- Part 7. Rock gloss test;

--- Part 8. Rock antifreeze test;

---Part 9. Rock resistance to disintegration test;

--- Part 10. Rock expansion test;

--- Part 11. Rock erosion test;

--- Part 12. Rock acid and alkali resistance test;

--- Part 13. Rock specific heat test;

--- Part 14. Rock thermal conductivity test;

---Part 15. Rock breakdown voltage and breakdown strength test;

---Part 16. Rock volume resistivity and surface resistivity test;

--- Part 17. Rock radioactivity specific activity test;

---Part 18. Rock uniaxial compressive strength test;

---Part 19. Rock uniaxial compression deformation test;

--- Part 20. Rock triaxial compression strength test;

--- Part 21. Rock tensile strength test;

--- Part 22. Rock flexural strength test;

--- Part 23. Rock point load strength test;

--- Part 24. Rock acoustic wave velocity test;

---Part 25. Rock shear strength test;

--- Part 26. Rock mass deformation test (bearing plate method);

--- Part 27. Rock mass deformation test (drilling deformation method);

---Part 28. Rock mass strength test (direct shear test);

--- Part 29. Rock mass strength test (bearing plate method);

--- Part 30. Rock mass bolt load test;

--- Part 31. Rock sound wave velocity test.

This part is part 21 of DZ/T 0276.

This part is drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces DY-94 "Testing procedures for physical and mechanical properties of rocks. 19. Tensile strength test (cracking method)". This part and DY-94 in contrast to the editorial changes, the main technical changes are as follows.

--- Added three chapters of "normative reference documents", "terms and definitions" and "principles";

--- Increased the invalidation of the sample results;

--- Removed the contents of the notes;

--- Revised the size requirements for sample preparation;

--- Revised the manufacturing size requirements for non-standard samples;

--- Revised the accuracy requirements of the test results, taking 3 significant figures;

--- Modified the tensile strength (cracking method) record sheet.

This part is proposed by the Ministry of Land and Resources of the People's Republic of China.

This part is under the jurisdiction of the National Land Resources Standardization Technical Committee (SAC/TC93).

This section drafted by. Hubei Institute of Geological Experiments.

Drafters of this section. Zhao Guifang, Zeng Jun, He Feng.

The previous versions of the standards replaced by this section are.

---DY-86;

---DY-94.

Rock physics and mechanics properties test procedures Part 21. Rock tensile strength test

1 Scope

This part of DZ/T 0276 specifies the tensile strength of rock measured by the splitting method.

This section applies to the determination of tensile strength of rock in rock physical and mechanical properties test.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

DZ/T 0276.5 Test procedures for physical and mechanical properties of rocks - Part 5. Rock water absorption test

3 Terms and definitions

The following terms and definitions apply to this document.

Tensile strength the maximum tensile stress that the rock specimen can withstand under the one-way tension condition.

4 Principle

In this test, the tensile strength of rock is measured indirectly by the splitting method. a relative linear load is applied along the diameter of the cylindrical sample to make the sample the part is broken by tensile stress in the radial direction, and the tensile strength of the rock is obtained.

5 Instruments

5.1 Material testing machine, the indication error shall not exceed ±1%.

5.2 Vernier caliper (range 15cm, accuracy 0.02mm), square (160mm × 100mm).

5.3 Diamond machine, stone cutting machine, stone grinding machine.

5.4 Inspection platform.

5.5 Tension clamp (see Figure 1).