Review of geotechnical measurement techniques for a nuclear waste repository in bedded salt Page: 38 of 285
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Some disadvantages of the barometer method are that
• It requires experienced personnel and reliable aneroid barom-
eters
• Correlation of outcropping strata is more difficult because
traverses are commonly set up on straight lines in definite
directions or on existing roads
i Barometric readings require constant attention to temperature
and need corrections before the map can be made.
2. Joint Mapping, Fracture Analysis, and Lineament Studies - Joint
mapping, fracture analysis, and lineament studies will provide information
related to the three-dimensional distribution of fractures, joints, and
other discontinuities. This information will aid in determining rock
permeability, ground-water movement, and stability of the repository
site. The information can be acquired by standard mapping methods, and
can be analyzed statistically. Such data are most easily evaluated if
graphically presented by stereographic projection (Hoek and Bray, 1974).
Information acquired from the mapping of joints on surface outcrops,
excavated slopes, and exploration trench walls is essential in assessing
the rock quality even though the information cannot be used quantitatively,
3. Trenching - Trenches and test pits are used to confirm and
expand data that are observed on the ground surface. Their use permits
observation of fresh and unweathereJ rock surfaces by removing surficial
deposits and weathered bedrock, which hide discontinuities and H; .guise
lithology. Trenches may uncover solution channels, prove or disprove
the existence of suspected faults, aid in identifying rock types, and
locate ground water. Trenches and test pits also provide a means of
obtaining samples for laboratory examination and tests. Trenches provide
a continuous exposure along a given line and thereby disclose the continu-
ity of strata.
2 - 13
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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/m1/38/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.