NF XP P94-424 standard shear test for estimating the mechanical properties of rock joints sampled from Yaounde gneisses (Cameroon)
Keywords:joint, rock mechanics, shear test, friction angle, Yaounde, Cameroon
This study is a contribution to the knowledge of rocks mechanical properties in Yaounde, with a scope on failure parameters. In most instances, this goal is achieved by carrying out XP P94-424 standard shear tests. Thus, the tests were carried out on two joint samples, using the experimental device of the Fondasol laboratory (France). However, the pairs of shear – normal stress values were plotted or computed to determine other relevant parameters. The results are expressed as graphs and value reports. (1) The global friction angle ranges around 36° for unsmoothed joints, and decreases up to 34° for smoothed joints. The friction angle ranges around 49° - 46° for unsmoothed joints, and decreases up to 3.90° for smoothed joints. The dilatancy i depend on the roughness and the type of joint surfaces; e. g. it ranged around 7° for the roughest surface while it ranged around 4° on the other. (2) At the peak the cohesion ranges around 81 kPa however, the wetness might affect this parameter up to its nullifying. At residual the cohesion ranges around 91 – 135 kPa.
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Copyright (c) 2022 Roger Bissaya, Aurélie Kamwa Ngamy , Robert Eko Medjo , Richard Tanwi Ghogomu , Bernard Njom
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