Angle of Repose and Angle of Sliding Friction: An Experimental Study

Research Article| June 01, 1945 ANGLE OF REPOSE AND ANGLE OF SLIDING FRICTION: AN EXPERIMENTAL STUDY ANASTASIA VAN BURKALOW ANASTASIA VAN BURKALOW HUNTER COLLEGE, NEW YORK, N. Y. Search for other works by this author on: GSW Google Scholar Author and Article Information ANASTASIA VAN BURKALOW HUNTER COLLEGE, NEW YORK, N. Y. Publisher: Geological Society of America Received: 06 Jun 1944 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1945, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1945) 56 (6): 669–707. https://doi.org/10.1130/0016-7606(1945)56669:AORAAO2.0.CO;2 Article history Received: 06 Jun 1944 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation ANASTASIA VAN BURKALOW; ANGLE OF REPOSE AND ANGLE OF SLIDING FRICTION: AN EXPERIMENTAL STUDY. GSA Bulletin 1945;; 56 (6): 669–707. doi: https://doi.org/10.1130/0016-7606(1945)56669:AORAAO2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Earlier studies of factors determining subaerial angles of repose of loose material have produced diverse results. In order to obtain dependable information for use in geomorphic investigations a controlled experimental study was undertaken. Results show that the angle of repose varies (1) inversely with size of fragments in perfectly sorted materials, but directly in those imperfectly sorted; (2) inversely with density of fragments; (3) directly with their angularity, roughness, and degree of compaction; (4) inversely with height of fall of material on free cones; (5) directly with increase of moisture up to the saturation point but inversely beyond that. A slope of repose convex in plan view is gentler than a plane slope, which in turn is gentler than a slope concave in plan view. Irregularities completely buried beneath a pile of loose material have no influence on the angles of repose unless the buried slope continues to a free edge over which the material slumps, when increased slope of the floor decreases the slope of repose of the overlying material.The angle of sliding friction, like the angle of repose, varies inversely with size and density of fragments and directly with their surface roughness. For the same material, however, the angle of sliding friction is definitely lower than the angle of repose.As examples of the practical application of these results to geomorphic studies, the following problems are discussed: the weathering back of a mountain front in a hypothetically “rainless” region; the characteristics of talus slopes; the convexity of divides; and the relation of fragment size to steepness of natural slopes of loose material. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.