An SPT test was performed in the US by using a Donut hammer with a borehole diameter of 150mm, a standard sampler sampling method, and a rod length of 5 meters. The test results are asthe table below. Find the (N1)60 for each N value and plot the (N1) 60 vs. depth. (Dry condition)Nm73579111315171921Unit WeightKN/m317171717171719191919155475715211828Blows count2786868172225303761061315182328

Given, Borehole diameter = 150 mm Rod length = 5 m

An SPT test was performed in the US by using a Donut hammer with a borehole diameter of 150 mm, a standard sampler sampling method, and a rod length of 5 meters. The test results are as the table below. Find the (N₁)60 for each N value and plot the (N1)60 vs. depth. (Dry condition) NE35 m 7 9 11 13 15 17 19 21 Unit Weight KN/m3 17 17 17 17 17 17 19 19 19 19 1 5 5 4 7 5 7 15 21 18 28 Blows count 2 7 8 6 8 6 8 17 22 25 30 3 7 9 6 10 6 13 15 18 23 28

An SPT test was performed in the US by using a Donut hammer with a borehole diameter of 150 mm, a standard sampler sampling method, and a rod length of 5 meters. The test results are as the table below. Find the (N₁)60 for each N value and plot the (N1)60 vs. depth. (Dry condition) NE35 m 7 9 11 13 15 17 19 21 Unit Weight KN/m3 17 17 17 17 17 17 19 19 19 19 1 5 5 4 7 5 7 15 21 18 28 Blows count 2 7 8 6 8 6 8 17 22 25 30 3 7 9 6 10 6 13 15 18 23 28

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter12: Subsurface Exploration

Section: Chapter Questions

Problem 12.2P

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Question

An SPT test was performed in the US by using a Donut hammer with a borehole diameter of 150
mm, a standard sampler sampling method, and a rod length of 5 meters. The test results are as
the table below. Find the (N1)60 for each N value and plot the (N1) 60 vs. depth. (Dry condition)
N
m
735
7
9
11
13
15
17
19
21
Unit Weight
KN/m3
17
17
17
17
17
17
19
19
19
19
1
5
5
4
7
5
7
15
21
18
28
Blows count
2
7
8
6
8
6
8
17
22
25
30
3
7
6
10
6
13
15
18
23
28

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The blow counts for an SPT test at a depth of 6 m in a coarse-grained soil at every 0.152 m are 10, 10 and 10. A donut automatic trip hammer and a standard sampler were used in a borehole 152 mm in diameter. The SPT N value is: O 1.8 O 2.5 O 3.20 O 4. 10
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