Date 1. The site investigation results below are for a site with sand and gravel above 18 ft and a clayey sand soil below. The upper sand and gravel layer has an average wet unit weight ol 105 pcf and the clayey sand has an average unit weight of 112 pcf. The standard penetration test was conducted using a safety hammer and a 2.5 in. diameter standard sampler with the results provided in the following table. Note any assumptions. Depth Blows/6 in. 6-12 Notes ft 0-6 12-18 8 15 20 19 2.5-4 6. 7.5-9 15-16.5 12 12 18 18 21 21 Water table at 18' 17-18.5 25-26.5 35-36.5 25 25 25 30 100 30 35 Refusal 40 a. Estimate the friction angle indicated for a foundation located 5 ft below grade.

Date 1. The site investigation results below are for a site with sand and gravel above 18 ft and a clayey sand soil below. The upper sand and gravel layer has an average wet unit weight ol 105 pcf and the clayey sand has an average unit weight of 112 pcf. The standard penetration test was conducted using a safety hammer and a 2.5 in. diameter standard sampler with the results provided in the following table. Note any assumptions. Depth Blows/6 in. 6-12 Notes ft 0-6 12-18 8 15 20 19 2.5-4 6. 7.5-9 15-16.5 12 12 18 18 21 21 Water table at 18' 17-18.5 25-26.5 35-36.5 25 25 25 30 100 30 35 Refusal 40 a. Estimate the friction angle indicated for a foundation located 5 ft below grade.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Date: 12/20/20
1. The site investigation results below are for a site with sand and gravel above 18 ft and a
clayey sand soil below. The upper sand and gravel layer has an average wet unit weight of
105 pcf and the clayey sand has an average unit weight of 112 pef. The standard penetration
test was conducted using a safety hammer and a 2.5 in. diameter standard sampler with the
results provided in the following table. Note any assumptions.
Depth
Blows/6 in.
Notes
ft
0-6
6-12
12-18
2.5-4
8
7.5-9
12
12
15
15-16.5
18
18
20
21
21
19
Water table at 18
17-18.5
25-26.5
35-36.5
40
25
25
25
30
30
35
100
Refusal
Estimate the frietion angle indicated for a foundation located 5 ft below grade.
a.

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