›› 2009, Vol. 30 ›› Issue (1): 12-18.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Determination of rock fracture toughness by split test using five types of disc specimens

ZHANG Sheng 1, 2, WANG Qi-zhi 1, 3   

  1. 1. Department of Civil Engineering. and Applied Mechanics, Sichuan University, Chengdu 610065, China; 2. Department of Mining Engineering, Henan Polytechnic University, Jiaozhuo, Henan 454001, China; 3. State Key Laboratory of Hydraulics and Mountain River Engineering,, Chengdu 610065, China
  • Received:2007-03-22 Online:2009-01-10 Published:2011-01-14

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Abstract:

The opening mode fracture toughness of rock can be tested by five different configurations of disc specimens, which are flattened Brazilian disc, holed-flattened Brazilian disc, cracked chevron notched Brazilian disc, cracked straight-through Brazilian disc, and holed-cracked flattened Brazilian disc. The loading manner is splitting through diametrical compression. The machining method for specimens is introduced; and the formulas for determining the fracture toughness are given. The results of disc splitting test show that the values of fracture toughnesses for marble determined from the discs with notch are between 0.78 MPa•m1/2 and 0.91 MPa•m1/2; and the values determined from the discs without notch are between 1.01 MPa•m1/2 and 1.04 MPa•m1/2. It is found that values determining from the discs with notch are more stable; and more ideal thinner notch width can be achieved for the holed-cracked flattened Brazilian discs.

Key words: disc specimens, split test, rock fracture toughness

CLC Number: 

  • TU 458
[1] ZHANG Sheng, WANG Long-fei, CHANG Xu, WANG Dong-kun, WANG Xiao-liang, QIAO Yang, . Experimental study of size effect of fracture toughness of limestone using the notched semi-circular bend samples [J]. Rock and Soil Mechanics, 2019, 40(5): 1740-1749.
[2] DU Meng-ping, PAN Peng-zhi JI Wei-wei ZHANG Zhen-hua GAO Yao-hui . Time-space laws of failure process of carbonaceous shale in Brazilian split test [J]. , 2016, 37(12): 3437-3446.
[3] CUI Zhen-dong，LIU Da-an，AN Guang-ming，ZHOU Miao，LI Zhi-qing. Research for determining mode I rock fracture toughness KIC using cracked chevron notched brazilian disc specimen [J]. , 2010, 31(9): 2743-2748.
[4] LI Gang, CHEN Zheng-han, XIE Yun, ZU Wen-hua. Test research on dynamic characteristics of Three Gorges granite under high strain rate [J]. , 2007, 28(9): 1833-1840.
[5] WU Li-zhou, JIA Xue-ming, WANG Qi-zhi . A new stress intensity factor formula of cracked chevron notched Brazilian disc (CCNBD) and its application to analyzing size effect [J]. , 2004, 25(2): 233-237.
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