LABORATORY TESTS TO DETERMINE SHEAR STRENGTH PARAMETERS
The critical state friction angle, f9cs, for a clean coarse-grained soil can be found by pouring the soil into a
loose heap on a horizontal surface and measuring the slope angle of the heap relative to the horizontal.This angle is sometimes called the angle of repose, but it closely approximates f9cs. Read this topic
Confusions- Can anybody answer? 
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