Proceedings Volume of the Geological Society of America for 1960
Author : Geological Society of America. Meeting
Publisher :
Page : 206 pages
File Size : 16,72 MB
Release : 1962
Category : Geology
ISBN :
Author : Geological Society of America. Meeting
Publisher :
Page : 206 pages
File Size : 16,72 MB
Release : 1962
Category : Geology
ISBN :
Author : Geological Society of America
Publisher :
Page : 254 pages
File Size : 10,99 MB
Release : 1962
Category : Geology
ISBN :
List of members.
Author : Geological Society of America
Publisher :
Page : 1176 pages
File Size : 20,19 MB
Release : 1958
Category : Geology
ISBN :
List of members.
Author : Geological Society of America
Publisher :
Page : 630 pages
File Size : 37,30 MB
Release : 1958
Category : Geology
ISBN :
Author :
Publisher :
Page : 360 pages
File Size : 37,79 MB
Release : 1983
Category : Geology
ISBN :
Author :
Publisher :
Page : 318 pages
File Size : 16,68 MB
Release : 1989
Category : Geological surveys
ISBN :
Author :
Publisher :
Page : 234 pages
File Size : 22,29 MB
Release : 1984
Category : Geology
ISBN :
Author : Geological Survey (U.S.)
Publisher :
Page : 76 pages
File Size : 39,51 MB
Release : 1992
Category : Geology
ISBN :
Author : Christopher J. Schenk
Publisher :
Page : 390 pages
File Size : 39,71 MB
Release : 1983
Category : Basalt
ISBN :
Author : William G. Pariseau
Publisher : CRC Press
Page : 263 pages
File Size : 10,20 MB
Release : 2019-11-05
Category : Science
ISBN : 0429766491
This book is about geoplasticity, solid mechanics of rock, jointed rock and soil beyond the domain of a purely elastic deformation. Plastic deformation is irreversible and begins at the limit to elasticity with any attempt at further loading. Stress at the limit to elasticity is "strength" which is described by a functional relationship amongst stresses, that is, by a yield function or failure criterion. Mohr-Coulomb, Drucker-Prager and Hoek-Brown criteria are well-known examples in geomechanics. Beyond the elastic limit, but still within the realm of small strain increments, a total strain increment is the sum of an elastic increment and a plastic increment. The elastic increment is computed through an incremental form of Hooke’s law, isotropic or anisotropic as the case may be. Computation of the plastic part is at the core of any plasticity theory and is approached through the concept of a plastic potential. The plastic potential is a function of stresses and perhaps other material parameters such as plastic strain and temperature. Derivatives of the plastic potential with respect to stress lead to the plastic part of the total strain increment. If the yield criterion and plastic potential are the same, then the plastic stress-strain relationships are "associated rules of flow" and follow a "normality" principle. Normality is in reference to a graphical portrayal in principal stress space where the plastic strain increment is perpendicular to the yield surface. If the plastic potential and yield criterion are different, as is often the case in geoplasticity, then the rules of flow are "non-associated". Drucker’s famous stability postulate implies normality at a smooth point on the yield surface, convexity of the yield function and other important features of plasticity theory in geomechanics. However, there is no point to proceeding to theoretical analyses without physical justification. Hence, the physical foundations for application of plasticity theory to rock, jointed rock and soil are examined in Chapter 2 of this book. A brief review of continuum mechanics principles is given in Chapter 3. Chapter 4 focuses on plane plastic strain and "sliplines". The technical literature is replete with numerous diagrams of sliplines, especially in discussions of foundations on soils, but the relevant mathematics is often lacking and with it genuine understanding. Examples illustrate application of theory to traditional geomechanics problems such as computation of retaining wall forces in soils, foundation bearing capacity of soil and rock, wedge penetration of rock under confining pressure and others. Brief discussions of anisotropy, visco-plasticity and poro-plasticity are presented in Chapters 6, 7 and 8. This book will be of interest to civil, geological and mining engineers, particularly those involved in reliable design of excavations and foundations beyond elasticity, especially in jointed rock.