Published: Građevinar 78 (2026) 5
Paper type: Scientific research paper
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Experimental investigation of time-dependent deformation of soft rock along discontinuities

This study presents an experimental investigation of the time-dependent shear behaviour of soft rock discontinuities. Three marly limestone specimens obtained from the Pljevlja coal basin were tested under controlled laboratory conditions. The specimens had identical geometric characteristics but differed in discontinuity surface roughness (smooth, undulating and moderately rough). A dedicated experimental apparatus was designed and adapted to perform long-term shear tests under constant normal loading and incremental shear loading. The results demonstrate the significant influence of discontinuity roughness on shear resistance, displacement development and test duration. Given the limited number of published studies addressing time-dependent deformation of soft-rock discontinuities, the presented pilot investigation provides valuable insight into the governing mechanisms and establishes a basis for a comprehensive experimental programme.

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