The Uniaxial Compressive Test of Rocks Controlled by a Negative Feed Back of Stress Rate

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  • 応力速度のNegative Feed Backを用いた岩石の一軸圧縮試験
  • 応力速度のNegative Feed Backを用いた岩石の1軸圧縮試験
  • オウリョク ソクド ノ Negative Feed Back オ モチイタ ガ

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Abstract

Uniaxial compressive tests for eight rocks including one marble, one granite, two andesites and four tuffswere carried out by a servo-controlled testing machineunder a condition of a constant rate of (ε-σ/E'). Completestress-strain curves of all rocks were obtained and it was found that the post-failure behaviour of rocks except a marble can be classifiedto Class II. In all tests, rock failure was fully controlled with the newly proposed negative feed back of stress rate. Itshows agreat potential of the pro-posed testing method to investigate the post-failure behaviour of brittle materials as rocks with aminimum modification to a conventional servo-controlled testing machine.<BR>Finally, a brief discussion concerning the fundamental mechanism of Class II post-failure behaviour isgiven on the basis of the test results.

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