Review of geotechnical measurement techniques for a nuclear waste repository in bedded salt Page: 55 of 285
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6. Engineering Classification of Rock Masses - There have been
manv attempts to derive classification systems which would allow
numerical values to be assigned to discontinuous rock masses (Deere,
1963; Bieniawski, 1974). Some of the parameters are strength of the
intact rock material, degree of fracturing of drill core and fracture
spacing, and condition and orientation of joints and fractures.
Goodman (1976) lists several systems, tv/o of which are described below.
One index, developed by Deere (1963), is the Rock Quality Designation
(RQD), which is the ratio of the combined length of all hard and strong
pieces of core 10-cm or longer to the total length of the core run.
The RQD is one factor in the classification system proposed by Bieniawski
(1974) which assigns a numerical value based upon uniaxial compres-
sive strength of rock material, RQD, spacing of joints, condition of
joints, orientation of joints, and ground-water conditions, Use of a
standard classification system would allow a more meaningful comparison
of various rock units at alternative sites than the general gualitative
terms in use today.
7. Interpretation of Geologic Structural Data - Interpretation
of geologic structural data is greatly facilitated by use of the
descriptive geometry techniques of Badgley (1959) and the principles
of stereographic projection and joint surveys described by Goodman
(1976). Use of these methods allows interpretation of field data and
solution of problems involving the relationship of formations, struc-
tures, lines and planes in space. Such problems are difficult to solve
by other means.
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Review of geotechnical measurement techniques for a nuclear waste repository in bedded salt, report, December 1, 1979; United States. (https://digital.library.unt.edu/ark:/67531/metadc1093986/m1/55/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.