An approach to predicting the overall strengths of unwelded bimrocks and bimsoils

摘要: The strength of geological materials is a fundamental property used in the design civil engineering works; including projects constructed complex mixtures or fragmented rocks such as melanges, fault rocks, coarse pyroclastic breccias and sheared serpentines. These other, often chaotic, mechanically and/or spatially heterogeneous rock masses are composed relatively strong blocks surrounded by weaker matrix rocks. common mixtures, known bimrocks (block-in-matrix-rocks) bimsoils (when material soil-like) very difficult to evaluate. It almost impossible recover high quality, undisturbed drill core samples prepare laboratory specimens perform studies evaluate geomechanical parameters cohesion, internal friction angle uniaxial compressive from these mixtures. There sparse literature describing empirical on bimrocks. Hence, this study was devised develop preliminary Bim criterion, generalized conceptual approach for predicting overall unwelded bimsoils. considered rules soil mechanics reported mechanical behavior function volumetric block proportion (VBP), literature. In addition, cores artificial bimrock were prepared triaxial compression testing. Empirical equations useful devised, which depend practical charts input parameters, parameter “A”, defined relate contact between blocks. predictive calibrated using database. performance criterion checked established database, found have predictability, although erring slightly conservative side.