Chapter 17, Problem 17.10P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

Refer to the footing in Problem 17.8. For calculating elastic settlement under the footing, it is necessary to estimate the elastic modulus of the foundation soil. Using *q _{c}* from Problem 17.9 and Eq. (17.33), estimate the variation of elastic modulus with depth for the soil profile shown in Figure 17.16.

**Figure 17.16**

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 settlement is 25 mm. Use Eqs. (16.56) and (16.61).

To determine

Find the modulus elasticity of the foundation soil with the various depth.

Explanation

Given information:

The atmospheric pressure is

Assume the grain size

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:**

Show the expression of correlation between

Here, *c* and *a* as developed from various studies.

For *c* and *a* value given by Kulhawy and Mayne(1990).

Refer Table 17.7 in section 17.11 “Cone penetration test” in the textbook.

c | a |

5.44 | 0.26 |

Find the variation of cone penetration resistance with various depth

Substitute *c*, 0.26 for *a*, and 6 for

Find the variation of cone penetration resistance with various depth

Substitute *c*, 0.26 for *a*, and 8 for

Find the variation of cone penetration resistance with various depth

Substitute *c*, 0.26 for *a*, and 11 for

Find the variation of cone penetration resistance with various depth

Substitute *c*, 0.26 for *a*, and 13 for

Find the variation of cone penetration resistance with various depth

Substitute *c*, 0.26 for *a*, and 14 for

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