Abstract Because of the difficulties of experimental equipments and techniques，the experiment of rock under tension is more complex than that under compression. In some conditions，rock failure in situ begins with tension. In order to test the limit tensile strain of rock，the relationship between stress and strain，and the mechanical characteristics of rock，the methods for determining the stress-strain curves of rock specimens under tension are introduced，and the tensile stress-strain curves are analyzed. Meanwhile，the mechanical properties by direct tensile test are also compared with those by split method.
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Received: 19 July 2003
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