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Effects of Strain Rate and Water Saturation on the Tensile Strength of Rocks  

Jung, Woo-Jin ((주)우진엔지니어링 연구개발부)
Publication Information
Tunnel and Underground Space / v.20, no.2, 2010 , pp. 119-124 More about this Journal
Abstract
Hopkinson's effect tests were carried out for various strain rates on three different types of rock in both saturated and dry states in order to examine the effects of strain rate and water saturation on tensile strength. The tensile strength increased with the increase of the strain rate not only in dry state but also in saturated state. It was also especially recognizable that the dynamic tensile strength of rock in the dry state was proportional to approximately a one-third multiple of strain rate no matter what the type of rock. It was found that water saturation decreased tensile strength in the dry state of sandstone and tuff, both with high porosity, but no significant difference could be recognized between the dry and the saturated states of granite, which has a low porosity of 0.49%.
Keywords
Rock; Tensile strength; Dynamic load; Strain rate; Water saturation;
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