Canadian Dam Association Bulletin - Summer 2017 - 16

ranging from 5 mm to 100 mm, and
have been located to a depth of about
35 m from the valley face based on
large diameter investigation holes.
In an exploratory adit located on the
left bank, the joints were found to
have similar openings till about 20 m
horizontally in from the terrace edge.
Beyond those depths the joints were
considered "closed" as they were
found to be tight or with negligible

gaps. Prominent joints were typically
weathered by groundwater seepage.
2.2.2 Bedding Planes
Numerous bedding plane (BP) discontinuities have been mapped in
the project area. They are typically
found adjacent to concretion layers
or sandy-silty laminations, or within
weaker units. Most bedding planes are
discontinuous hairline partings with
little or no infilling; however, some

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have been found which appear to be
continuous and infilled with silty clay.
The location of the bedding planes in
the stratigraphic column is presented
in Figure 2.
Laboratory tests to determine the
shear strength of these bedding planes
were undertaken by BC Hydro during
the 1980's and the results are presented
in numerous reports produced at that
time. The current design acknowledges the excellent work done during
the 1980's and much of the design is
based on the results of that field and
laboratory work. Some of the bedding
planes were found to have very low
shear strength values. These bedding
planes have largely influenced the
decisions regarding the arrangement
of the Site C dam. These critical bedding planes are BP-8, BP-12, BP-25,
BP-28, BP-31 and BP-33.
BP-25 is located in both valley
walls at an elevation just above river
level. Laboratory tests revealed that
this bedding plane has the lowest
shear strength of all the bedding
planes found at the site. BP-25 is a
continuous discrete, planar, weak
bedding plane, identified in virtually
all boreholes drilled on site. BP-25
is considered to be the most important bedding plane for the design of
the headworks structures, which are
located on the right bank, as it daylights in the valley wall just above
river bed level.
2.2.3 Shear Zones
Shears or cross-cutting discontinuities have been seen or inferred in most
areas of the dam site. Any shears that
have been traced on the site have at
least 0.2 m of vertical displacement.
These shears are characterized by at
least 0.05 m of gouge and breccia and
by distorted bedding. The major shears
can consist of over 3 m of gouge and
breccia with pods of intact rock and
associated rotated bedding.
The right bank, which has been
more intensely investigated than the
river and the left bank, was found to
be more highly sheared than the left
bank. The main shears in the right
bank have been generally subdivided

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Table of Contents for the Digital Edition of Canadian Dam Association Bulletin - Summer 2017

Board of Directors
President's Message
Roller Compacted Concrete Buttress at the Site C Clean Energy Project
Hurricane Igor's Impact on Newfoundland Power's Small Hydro
CDA Conference Heads to Kelowna!
CDA Directors & Officers - Call for Nominations
2017 CDA Awards - Call for Nominations
CDA Developing New Ways to Distribute Guidelines
Notice of Annual General Meeting
Time to Renew Your Membership
Buyers' Guide and Trade List
Canadian Dam Association Bulletin - Summer 2017 - intro
Canadian Dam Association Bulletin - Summer 2017 - 1
Canadian Dam Association Bulletin - Summer 2017 - 2
Canadian Dam Association Bulletin - Summer 2017 - 3
Canadian Dam Association Bulletin - Summer 2017 - 4
Canadian Dam Association Bulletin - Summer 2017 - 5
Canadian Dam Association Bulletin - Summer 2017 - 6
Canadian Dam Association Bulletin - Summer 2017 - Board of Directors
Canadian Dam Association Bulletin - Summer 2017 - 8
Canadian Dam Association Bulletin - Summer 2017 - President's Message
Canadian Dam Association Bulletin - Summer 2017 - 10
Canadian Dam Association Bulletin - Summer 2017 - 11
Canadian Dam Association Bulletin - Summer 2017 - Roller Compacted Concrete Buttress at the Site C Clean Energy Project
Canadian Dam Association Bulletin - Summer 2017 - 13
Canadian Dam Association Bulletin - Summer 2017 - 14
Canadian Dam Association Bulletin - Summer 2017 - 15
Canadian Dam Association Bulletin - Summer 2017 - 16
Canadian Dam Association Bulletin - Summer 2017 - 17
Canadian Dam Association Bulletin - Summer 2017 - 18
Canadian Dam Association Bulletin - Summer 2017 - 19
Canadian Dam Association Bulletin - Summer 2017 - 20
Canadian Dam Association Bulletin - Summer 2017 - 21
Canadian Dam Association Bulletin - Summer 2017 - 22
Canadian Dam Association Bulletin - Summer 2017 - 23
Canadian Dam Association Bulletin - Summer 2017 - Hurricane Igor's Impact on Newfoundland Power's Small Hydro
Canadian Dam Association Bulletin - Summer 2017 - 25
Canadian Dam Association Bulletin - Summer 2017 - 26
Canadian Dam Association Bulletin - Summer 2017 - 27
Canadian Dam Association Bulletin - Summer 2017 - 28
Canadian Dam Association Bulletin - Summer 2017 - 29
Canadian Dam Association Bulletin - Summer 2017 - 30
Canadian Dam Association Bulletin - Summer 2017 - 31
Canadian Dam Association Bulletin - Summer 2017 - 32
Canadian Dam Association Bulletin - Summer 2017 - 33
Canadian Dam Association Bulletin - Summer 2017 - 34
Canadian Dam Association Bulletin - Summer 2017 - 35
Canadian Dam Association Bulletin - Summer 2017 - CDA Conference Heads to Kelowna!
Canadian Dam Association Bulletin - Summer 2017 - 37
Canadian Dam Association Bulletin - Summer 2017 - 38
Canadian Dam Association Bulletin - Summer 2017 - 39
Canadian Dam Association Bulletin - Summer 2017 - 40
Canadian Dam Association Bulletin - Summer 2017 - 41
Canadian Dam Association Bulletin - Summer 2017 - 42
Canadian Dam Association Bulletin - Summer 2017 - 43
Canadian Dam Association Bulletin - Summer 2017 - 44
Canadian Dam Association Bulletin - Summer 2017 - 45
Canadian Dam Association Bulletin - Summer 2017 - CDA Directors & Officers - Call for Nominations
Canadian Dam Association Bulletin - Summer 2017 - 47
Canadian Dam Association Bulletin - Summer 2017 - 2017 CDA Awards - Call for Nominations
Canadian Dam Association Bulletin - Summer 2017 - 49
Canadian Dam Association Bulletin - Summer 2017 - CDA Developing New Ways to Distribute Guidelines
Canadian Dam Association Bulletin - Summer 2017 - 51
Canadian Dam Association Bulletin - Summer 2017 - 52
Canadian Dam Association Bulletin - Summer 2017 - Notice of Annual General Meeting
Canadian Dam Association Bulletin - Summer 2017 - Time to Renew Your Membership
Canadian Dam Association Bulletin - Summer 2017 - Buyers' Guide and Trade List
Canadian Dam Association Bulletin - Summer 2017 - 56
Canadian Dam Association Bulletin - Summer 2017 - 57
Canadian Dam Association Bulletin - Summer 2017 - 58
Canadian Dam Association Bulletin - Summer 2017 - 59
Canadian Dam Association Bulletin - Summer 2017 - 60
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