Chapter 17, Problem 17.3P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

The following are the results of a standard penetration test in sand. Determine the corrected standard penetration numbers, (*N*_{1})_{60}, at the various depths given. Note that the water table was not found during the boring operation. Assume that the average unit weight of sand is 18.7 kN/m^{3}. Use Liao and Whitman’s relationship [Eq. (17.10)]. Assume *p _{a}* ≈ 100 kN/m

To determine

Find the corrected standard penetration numbers

Explanation

Given information:

Show the depth and number of blows shown in table:

Depth,(m) | |

1 | 10 |

2.5 | 12 |

4 | 14 |

5.5 | 15 |

7 | 17 |

Assume the average unit weight

The atmospheric pressure is

Calculation:

Calculate the overburden pressure

Substitute

Find the correction factor

Here,

Substitute

Find the corrected standard penetration numbers

Here,

Substitute

Thus, the corrected standard penetration numbers at the depth

Calculate the overburden pressure

Substitute

Find the correction factor

Substitute

Find the corrected standard penetration numbers

Substitute

Thus, the corrected standard penetration numbers at the depth

Calculate the overburden pressure

Substitute

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