A Comparison between Angle of Repose and Friction Angle of Sand

ABSTRACT: It may be said that the shape of sand deposition is normally cone and sand grains are oriented a certain angle of deposition repose is made. This angle is such that no stability occurs. Thus the angle of repose is somewhat correlated to the sand internal friction angle. This paper presents the results of a series of laboratory experiments performed three types of sand. For this purpose, a special device has been prepared. The device is well equipped and makes it possible to pour sand from various heights. After pouring sand from a certain height, the angle of repose is measured using the geometry of sand deposition. Direct shear tests are also carried out on the sand at the same compaction to determine the friction angle. These two angles are then correlated. The results show that the angle of repose can be correlated to the internal friction of the sand. An empirical expression is presented to correlate these two, enabling users to estimate the friction angle of the sand in the field.