Study on new formulation of shear strength for irregular rock joints

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Abstract As is known, Ladanyi's shear strength criterion is only applied to the regular triangular joints. The purpose of this study is the proposal of a new shear strength criterion which is applied to irregular joints. First of all, the appropriate estimation method of irregular joint profiles must be quantitatively estimated. The artificial plaster specimens which have four different JRC profiles, and the sandstone specimens including the irregular joint are applied on the direct shear test. The other hand, before direct shear test, in order to estimate the irregular joint surface profile of these specimens, the measurement and analysis of joint surface profile for each specimen using laser profilometer have conducted. As the results, the new experimental equations which exactly represent the shear strength parameters included in Ladanyi's shear strength criterion was proposed, and it is recognized that this new experimental equations can be applied for the rock specimens having the irregular joint.

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