Accession Number : AD0762410

Title :   Deformation Behavior and Fracture Mechanisms of Rocks

Descriptive Note : Technical rept. Mar-Jul 1972

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s) : Lew, T K

PDF Url : AD0762410

Report Date : May 1973

Pagination or Media Count : 45

Abstract : A study was conducted to determine from the literature what is known about the deformation behavior and fracture mechanisms of intact, fractured, and jointed rocks. The literature indicates the following: The mechanical properties of an intact rock are not unique; rather, they vary with mineral composition, grain size, state of stress, and strain rate. Deformation behavior and fracture mechanisms of an intact rock are characterized by crack growth and deformation of the constituent grains. Dilatancy of an intact rock under compression is associated with shear stress. Fractured rock can still carry load. Deformation of a fractured rock tends to concentrate along the major discontinuities. Furthermore, deformation of a jointed material is characterized by slip along joints, interlocking of the intact blocks, and fracturing of the intact blocks. Under a given state of stress, the stiffness and the strength of a fractured or jointed rock are generally lower than those for the intact rock.

Descriptors :   *ROCK, *UNDERGROUND STRUCTURES, COMPRESSIVE PROPERTIES, CRACK PROPAGATION, CRACKS, DEFORMATION, FAILURE(MECHANICS), FRACTURE(MECHANICS), GRAIN SIZE, MECHANICAL PROPERTIES, STRAIN(MECHANICS), STRESSES, STRUCTURAL PROPERTIES

Subject Categories : Geology, Geochemistry and Mineralogy
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE