Abstract
Rock reliefs are used for assessing joint rock coefficients that serve in geotechnical engineering for computing shear strength of rock joints. The three-dimensional reliefs of small rock joints amounting to several centimetres may be digitally reconstructed in laboratories but large joints whose sizes reach several meters have to be reconstructed in terrains and require a specially adapted technique for three-dimensional reconstruction. This contribution describes one of the devices capable of performing digital reconstructions in terrains. This device has been developed in our laboratory on the basis of affordable components.
Highlights
Barton, Choubey and Bandis [1 - 3] introduced a model for computing shear strength of rock joints in the following form ntg JRC log JCS n r iu (1)where n is normal effective stress, JCS represents effective joint wall compressive strength, JRC joint rock coefficient, r basic friction angle and iu is the inclination angle of rock asperities that is related to large scale undulation of bedding plane
Rock reliefs are used for assessing joint rock coefficients that serve in geotechnical engineering for computing shear strength of rock joints
As soon as the 3D reliefs are digitized by the sectional method, various height characteristics may be computed as, for example, the global parameter called the root-mean-square (RMS) parameter of the relief that is expressed by a function of two variables f (x, y)
Summary
Choubey and Bandis [1 - 3] introduced a model for computing shear strength of rock joints in the following form ntg JRC log JCS n r iu (1)where n is normal effective stress, JCS represents effective joint wall compressive strength, JRC joint rock coefficient, r basic friction angle (material constant) and iu is the inclination angle of rock asperities that is related to large scale undulation of bedding plane (second order asperities). The three-dimensional reliefs of small rock joints amounting to several centimetres may be digitally reconstructed in laboratories but large joints whose sizes reach several meters have to be reconstructed in terrains and require a specially adapted technique for three-dimensional reconstruction. This contribution describes one of the devices capable of performing digital reconstructions in terrains.
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