MECHANICS OF UNLUBRICATED SLIDING
Hubbert and Rubey's terms (1lambda) in their expressions for subaerial sliding and (1lambda sub a) in those for submarine sliding can be replaced with greater generality by delta equals (1lambda)/(1lambda sub e), where lambda is the ratio of porefluid pressure to total normal stress, and lambda sub e is the ratio of ambiant fluid pressure (air or water) total normal stress, both at the sliding surface. The critical slope theta down which subaerial and submarine sliding can take place is given by tan theta equals (tau sub o/sigma sub e) plus delta tan phi, where tau sub o is the initial shear strength of the material at the sliding surface, sigma sub e is the normal component of the loading or "active" stress, and tan phi is the coefficient of sliding friction for the materials of the sliding surface. For evaluating the mechanism of submarine slides revealed by marine seismic surveys, the following expression may be useful when the initial shear strength of the material can be regarded as negligibly small compared to sigma sub e: delta equals tan theta/tan phi. From the value of delts an estimate of the porefliud pressures at the sliding surface at the time of sliding can be obtained. /Author/

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Corporate Authors:
Geological Society of America
3300 Penrose Place
Boulder, CO United States 80301 
Authors:
 Chapman, R E
 Publication Date: 19791
Media Info
 Features: Figures; References; Tables;
 Pagination: p. 1928

Serial:
 Geological Society of America, Bulletin
 Volume: 90
 Issue Number: 1
 Publisher: Geological Society of America
 ISSN: 00167606
Subject/Index Terms
 TRT Terms: Earth movements (Geophysics); Equations; Fluid dynamics; Geophysics; Lubrication; Pore pressure; Seismology; Shear strength; Slopes; Stresses; Underwater structures
 Uncontrolled Terms: Earth movements; Sliding
 Old TRIS Terms: Submerged conditions
 Subject Areas: Bridges and other structures; Geotechnology; Highways;
Filing Info
 Accession Number: 00190050
 Record Type: Publication
 Report/Paper Numbers: Part I
 Files: TRIS
 Created Date: May 11 1979 12:00AM