Question #4: It has been anticipated that the soil under the proposed dam is contaminated, and needs to be removed and backfilled to a depth of 2.5 feet. A Standard Proctor compaction test was conducted on soil from a borrow pit, with the results shown below right. Based on the results: a) Plot the Proctor curve for the borrow soil. b) Suggest a compaction method for this borrow soil (equipment and method) based on the type of soil indicated in Question #1. c) If we borrow soil from a pit with a void ratio of 0.71, determine how much soil we need to borrow to backfill below the dam to match the in-situ void ratio of the top layer of soil. Y (pcf) 102.32 W 3.8% 109.44 13.1% 121.45 6.1% 123.64 9.3% 132.75 7.9%
Question #4: It has been anticipated that the soil under the proposed dam is contaminated, and needs to be removed and backfilled to a depth of 2.5 feet. A Standard Proctor compaction test was conducted on soil from a borrow pit, with the results shown below right. Based on the results: a) Plot the Proctor curve for the borrow soil. b) Suggest a compaction method for this borrow soil (equipment and method) based on the type of soil indicated in Question #1. c) If we borrow soil from a pit with a void ratio of 0.71, determine how much soil we need to borrow to backfill below the dam to match the in-situ void ratio of the top layer of soil. Y (pcf) 102.32 W 3.8% 109.44 13.1% 121.45 6.1% 123.64 9.3% 132.75 7.9%
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:Scenario
The concrete dam in the figure below is to be built on top of a soil whose profile consists of two
horizontal layers of soil, each 5 ft thick. The depth to the groundwater table is approx. 6 feet. The
dam is anticipated to weigh approx. 8200 psf, and will be 120 feet long (the dimension into and
out of the page).
The layers of the soil have the following properties:
k (ft/s)
unit weight (y)
(pcf)
void ratio
(in-situ)
Question #1.
top
8.2 × 10-3
122
0.47
bottom
1.9 × 10-7
130
0.33
8 ft Water
10 ft
D
20 ft
I
Impervious clay
Concrete dam
I
I
1
ТВ
1
1
1
1
H
1
2 ft water
Transcribed Image Text:Question #4:
It has been anticipated that the soil under the proposed dam is contaminated, and needs to be
removed and backfilled to a depth of 2.5 feet. A Standard Proctor compaction test was conducted
on soil from a borrow pit, with the results shown below right. Based on the results:
a) Plot the Proctor curve for the borrow soil.
b)
Suggest a compaction method for this borrow soil (equipment and
method) based on the type of soil indicated in Question #1.
c) If we borrow soil from a pit with a void ratio of 0.71, determine how
much soil we need to borrow to backfill below the dam to match the
in-situ void ratio of the top layer of soil.
Y (pcf)
W
3.8%
102.32
109.44
13.1%
121.45 6.1%
123.64 9.3%
132.75 7.9%
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