The first Rock Shear apparatus to Ethiopia
Senior geotechnical laboratory technicians and geologists of Ethiopia may not be familiar with -rock shear apparatus ,which is used to evaluate the peak shear strength and the residual shear strength of ajointed rock specimen, which is used to determine the frictional angle and the apparent cohesion.
This frictional angle helps to limit the designing loads and servisablity ,so that to have the safe bearing capacity of the materials that carry the structure
The apparatus directly gives :the varying shear stress, the constant normal load,and both horizontal and vertical displacement of this jointed rock specimen .
From this data a graph is tabulated ,shear strength Vs horizontal displacement--the graph gives the stiffness shear strength ,the peak shear strength and the residual shear strength.Then we can evaluate 3 kinds of coefficient of friction at those 3 different shear strength stages.
Joseph
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