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| DEVELOPMENT OF TEST DEVICE FOR DIRECT AXIAL TENSION ON ROCK AND ITS APPLICATION |
| ZHANG Xutao1，2，ZHANG Qiangyong1，YUAN Shengbo1，WANG Chao1，GAO Qiang1 |
(1. Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，China；
2. School of Architecture and Engineering，Liaocheng University，Liaocheng，Shandong 252059，China) |
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Abstract To overcome the deficiency of existing direct tension test device，axial positioning devices were developed，including an axial positioning device for bonding and an axial positioning device for tension. The two sets of axial positioning devices eliminated the bonding eccentricity and the tensile eccentricity respectively，ensuring that rock specimen be pulled in uniaxial tension state. The direct tension tests of rocks were then carried out using the axial positioning devices and the universal testing machine. The tensile strength，the ultimate tensile strain and the tensile elastic modulus of sandstone，limestone and granite were measured. In the direct tensile test，the standard rock specimen was used. The tensile stress-strain curves of these rocks were obtained. The failure surfaces of rock specimen were found to appear at the middle of specimen mostly. The most of the rock specimens displayed the mode of brittle failure. The fractures of rock influenced greatly the tensile properties of rock. In order to measure the tensile strength of rock accurately，the rock specimen should be selected strictly before testing.
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Received: 21 October 2013
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2014, Vol. 33 
