Abstract A fo rm u la is estab lished on the relat ion sh ip of jo in t rebound values and basic f rict ion angles. Som e
m ethods are p resen ted to determ ine the jo in t un iax ial comp ressive st rength and basic f rict ion angle, and to
m easu re jo in t roughness by pho tograph m easu ring m ethod. A determ inat ion m ethod of jo in t shear st rength is
estab lished based on the rebound test, pho tograph m easu ring m ethod and the test resu lt s.
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Received: 06 August 1999
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