Deformation Behaviors of Rocks under Uniaxial Tension and Compression Tests

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  • 単軸引張および圧縮試験下の岩石の変形挙動
  • タンジク ヒッパリ オヨビ アッシュク シケンカ ノ ガンセキ ノ ヘンケイ

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For the purpose of studying the failure mechanism of rocks, tension and compression tests were conducted on sandstone, granite and marble with a system of stiff testing apparatus. Some of the results obtained are as follows:<BR>(1) The Young's moduli for tension and compression seems to be nearly equal within each low stress range.<BR>(2) The stress-strain curves under tension begin to incline downwards remarkably as the stress increases, while under compression, there is scarcely such a tendency. The stress-lateral strain curves under compression have also the same tendency.<BR>(3) Under the tension and compression tests, acoustic emission (A. E.) occurs from comparatively low level to the half level of the maximum stress. Under compression tests, A. E. occurs continuously with high frequency during the extensive post-failure deformation.<BR>(4) The deformation and failure behaviors under repeated tension tests seem similar to those under repeated compression tests, and the Kaiser's effect is noticed also under tension.

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