The site soil consists of loose sand that are dry within the top 3 m and saturated below. The present blow countsranging between 2 and 10. Due to concerns regarding liquefaction dynamic compaction is proposed. The soilshould be improved to a depth of 10 m. A 20-ton tamper with a diameter of 1.5 m and a height of 1.5 m isavailable. Assume a square pattern. More than one pass may be required.Estimate:1. The required drop height2. Spacing of the drops3. Number of drops required4. Number of passes required5. SPT blow counts after improvement, and6. Settlement.

Answered: Image /qna-images/answer/c978ceb9-e1d7-4b23-91c1-f9d35cc190f6.jpg

Answered: Estimate: 1. The required drop height…

Estimate: 1. The required drop height 2. Spacing of the drops 3. Number of drops required 4. Number of passes required 5. SPT blow counts after improvement, and 6. Settlement.

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

The site soil consists of loose sand that are dry within the top 3 m and saturated below. The present blow counts
ranging between 2 and 10. Due to concerns regarding liquefaction dynamic compaction is proposed. The soil
should be improved to a depth of 10 m. A 20-ton tamper with a diameter of 1.5 m and a height of 1.5 m is
available. Assume a square pattern. More than one pass may be required.
Estimate:
1. The required drop height
2. Spacing of the drops
3. Number of drops required
4. Number of passes required
5. SPT blow counts after improvement, and
6. Settlement.

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