Chapter 11, Problem 11.3P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

Following are the results of a laboratory consolidation test on a sample of undisturbed clay obtained from the field.

The height of the specimen at the beginning of the test was 1.9 cm, and the diameter was 6.35 cm. The mass of the dry specimen was 91 g. Estimate the compression index and the preconsolidation pressure from the *e –* log *σ*′ curve. Given: *G _{s} =* 2.72.

To determine

Calculate the compression index and the preconsolidation pressure from the

Explanation

**Given information:**

The diameter of the specimen

The dry mass of the specimen

The specific gravity of soil solids

The pressure and final height of specimen are given in the table.

**Calculation:**

Consider the density of water as

Calculate the area of the specimen (*A*) using the relation.

Substitute *d*.

Calculate the height of solids

Substitute *A*,

Calculate the initial height of voids

Here, *H* is the initial height of the specimen.

Substitute *H* and

Similarly calculate the height of voids for remaining values and tabulated as in Table 1.

Calculate the initial void ratio

Substitute

Similarly calculate the void ratio for remaining values and tabulated as in Table 1.

Show the height of voids and initial void ratio as in Table 1.

Pressure, | Final height of the specimen, | |||

0 | 1.9 | 1.056 | 0.844 | 0.799 |

0.25 | 1.763 | 1.056 | 0.707 | 0.670 |

0.5 | 1.742 | 1.056 | 0.686 | 0.650 |

1 | 1.702 | 1.056 | 0.646 | 0.612 |

2 | 1.656 | 1 |

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