Investigation of mechanical behaviour of non-persistent jointed blocks under uniaxial compression

Mostafa Asadizadeh , Mahdi Moosavi , Mohammad Farouq Hossaini

Abstract

This paper presents the results of an empirical study in which square rock-like blocks containing two parallel pre-existing rough non-persistent joints were subjected to uniaxial compression load. The main purpose of this study was to investigate uniaxial compressive strength and deformation modulus of jointed specimens. Response Surface Method (RSM) was utilized to design experiments and investigate the effect of four joint parameters, namely joint roughness coefficient (JRC), bridge length (L), bridge angle (y) and joint inclination (theta). The interaction of these parameters on the uniaxial compressive strength (UCS) and deformation modulus of the blocks was investigated as well. The results indicated that an increase in joint roughness coefficient, bridge length and bridge angle increased compressive strength and deformation modulus. Moreover, increasing joint inclination decreased the two mechanical properties. The concept of \'interlocking cracks\' which are mixed mode (shear-tensile cracks) was introduced. This type of cracks can happen in higher level of JRC. Initiation and propagation of this type of cracks reduces mechanical properties of sample before reaching its peak strength. The results of the Response Surface Methodology showed that the mutual interaction of the joint parameters had a significant influence on the compressive strength and deformation modulus.

Key Words

physical model; non-persistent joint; mechanical behavior; joint roughness coefficient

Address

Mostafa Asadizadeh — 1.) Department of Mining Engineering, Hamedan University of Technology, Mardom Street, Hamedan, 65155-579, Iran 2.) School of Mining Engineering, College of Engineering, University of Tehran, 1439957131 Tehran, Iran
Mahdi Moosavi and Mohammad Farouq Hossaini — School of Mining Engineering, College of Engineering, University of Tehran, 1439957131 Tehran, Iran

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