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| INFLUENCE OF CENTER HOLE DIAMETER ON TEST VALUES OF ROCK DYNAMIC FRACTURE TOUGHNESS |
| ZHANG Sheng1，2，LI Xinwen3 |
(1. School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454001，China；
2. Collaborative Innovation Center of Coal Work Safety，Henan Polytechnic University，Jiaozuo，Henan 454001，China；
3. Yuwu Coal Industry Corporation，Lu?an Group，Changzhi，Shanxi 046103，China) |
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Abstract In order to study the influence on determining rock dynamic fracture toughness accurately with center hole，some 80 mm diameter marble specimens of Holed-cracked flattened Brazilian disc(HCFBD) with different diameter of center hole were performed in the split Hopkinson pressure bar system. The results showed that the average rock dynamic fracture toughness was 4.57 MPa•m1/2 as the dimensionless diameter of center hole r0/R∈(0.10，0.30). There was not obvious change for the test results of dynamic fracture toughness with different diameter of center hole，but there were a certain differences about specimen fracture patterns. When the center hole diameter was small，there were more secondary cracks in the process of the main crack extension. However，there were more obvious macro transfixion fracture and less secondary cracks with the increase of the center hole diameter. Which provides an important significance to promote the method of determining rock dynamic fracture toughness with Holed-cracked flattened Brazilian disc and to reveal the rock fracture characteristics under dynamic impact.
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2015, Vol. 34 
