Chapter 17, Problem 17.8P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

Refer to Problem 17.7 and Figure 17.16. Suppose a footing (1.5 m × 1.5 m) is constructed at a depth of 1 m.

**a. **Estimate the design values for *N*_{60} and

**b. **What is the net allowable load that the footing can carry? The maximum allowable **17.7** settlement is 25 mm. Use Eqs. (16.56) and (16.61).

Refer to the boring log shown in Figure 17.16. Estimate the average drained friction angle,
*p _{a}* ≈ 100 kN/m

**Figure 17.16**

(a)

To determine

Find the design value for

Explanation

**Given information:**

The allowable settlement is

The atmospheric pressure is

Assume the average unit weight

The footing size is

The depth of footing

The saturated

Show the depth and number of blows shown in table:

Depth,(m) | |

1 | 6 |

2.5 | 8 |

4 | 11 |

5.5 | 13 |

7 | 14 |

8.5 | 16 |

**Calculation:**

Calculate the design value for

The properties should be averaged over a distance 2*B* or

Calculate the design value for

Find the effective overburden pressure

Here,

Substitute

Find the effective overburden pressure

Here,

Substitute

Find the effective overburden pressure

Substitute

(b)

To determine

Find the net allowable load such that the foot can carry.

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