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CHAPTER VI--TEST INSTALLATIONS

60. Purpose. In addition to making tests on the fill to control embankment construction, test apparatus is installed in most dams built by the Bureau to determine the behavior of the earth embankment and appurtenant structures during construction and later reservoir operation. The apparatus permits measurements of pore fluid pressures in the embankment and foundation, consolidation of the embankment, and vertical settlement and horizontal alinement changes on the surface of the dam.

61. Piezometer Installation. the compacted impervious embankment, foundation gravel and sand, and in the shale bedrock. The installation included 12 foundation-type tips and 13 embankment-type tips. The tips were installed in shallow holes excavated in the compacted embankment (fig. 37).

A total of 25 piezometer tips were installed in

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Figure 37.--Laboratory technician preparing plastic tubing for installa

tion of piezometer in the embankment. P328-701-4711,
April 4, 1953.

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Figure 38.--Typical terminal well for 40 piezometer tips.

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Top of dam
embankment

Variable

-2" Std pipe coupling

-2" Std. steel pipe
(Riser section)

2" Std. pipe coupling

"Holes

-3"C 5 or equal

Weld

-Weld

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--3" [ 5#

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-2" Std. steel pipe

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"Steel plate

-2" Std steel pipe-..

-Oakum

-1" Std steel pipe
"Holes

See detail for

base plate

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See installation drawing for location of apparatus in dam embankment
Apparatus for measurement of base plates, shown on Dwgs. 40-D-4836 and 40-0-5051.
Determine the elevation of the base plate to the nearest 001 foot as each 5' riser
section of 2"pipe is installed.

Min. of 18" cover required over installation when 5'-0" lengths of 2" pipe are installed
For details of excavation and backfill of trenches for base plate and anchor crossarms,
see Dwg. 40-D-4414.

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Figure 40.--Settlement point installation details. (Sheet 1 of 2.)

From drawing 328-D-980.

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SETTLEMENT POINT LOCATION CHART

148.50' U.S.

Axis

El.

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263.50' D.S.

Axis
Sta.

El.

Sta.
20+00.34 2737. 64
22+00.33 2736. 87
24+00.36 2737.48
26+00.38 2737.48 27+00.22 2710.72
28+00.34 2737, 16 29+00.07 2710, 56
30+00.35 2737.50 31+00.10 2710.76
31+99.92 2737. 24 33+00.02 2711.06
34+00.13 2736. 89
35+99.94 27 36. 88
37+ 99.92 2736. 68
40+00.02 2737. 14
41+99.79 2735.79
43+99.81 2737.13
45+99.55 2737.05
47+99.69 2737.41
49+9 9.64 2737.42
51+99.60 2737.77
53+99.52 2736.91 54+ 99.72
56+00.93 2735.97 57+00.77
58+00.8A 2735.94 59+ 00.73
60+00.7 2735.97 61+00.55
62+00.71 2735.96 63+ 00.55

35+00.19 2710.71
37+00.03 2710.35
39+00.18 2711.09
40+ 99.89 2710.97
42+ 99.83 2710.85
44+99.78 2711.76
46+ 99.74 2710.36
48+ 99.70 2710.59
50+ 99.61 2710.61
52+ 99.55 2711.37
2711.74
2711.18

64+00.69 2735.96 65+ 00.53 66+00.52 2736.92 67+ 00.44

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2711.32

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2711.61
2711, 19
2711.50
2711.71

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NOTES

For details of embankment settlement installation, see Dwg. 40-D-4414
For details of foundation settlement installation, see bwg. 40-D-4631.
Each installation placed as embankment progressed.

Crest settlement points located downstream from the axis of the
dam installed on 200' centers from Sta. 7+00 to Sta. 83+00 incl.
Crest settlement points located upstream from the axis of the dam
installed on 200' centers from Sta. 8+00 to Sta. 84 +00 inclusive.
Crest settlement points adjusted to camber elevation.
Settlement point elevations recorded to nearest 0.01 foot.
Elevations of each pipe extension on foundation settlement
installations recorded to nearest 0.01 foot.

Elevations of all crossarms recorded to nearest 0.01 foot.
All settlement points designated by Axis Station and offset
upstream or downstream from axis of dam.

At Sta. 53+00, Installation "A" installed as foundation settlement
apparatus from base of cutoff trench to El. 2703± and continued
+
as embankment settlement apparatus from El. 2703 to upstream
face of dam.

Original settlement point elevations established January and
February 1954 except the following, established Febuary 1952:
127.50 U.S.-Stations 29+00 to 43+00, incl, and Stations 57+00
to 71+00 incl.

148.50 D.S.-Stations 28+00 to 42+00, incl., and Stations 56+00
to 68+00 incl.

263.50 D.S.-Stations 27+00 to 43+00, incl, and Stations 57+00
to 71+00 incl.

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Figure 40.--Settlement point installation details. (Sheet 2 of 2.) From drawing 328-D-980.

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