Consolidation test Essay Example

Consolidation test 8

CONSOLIDATION TEST

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Abstract

The data obtained from the experiment was used to plot the consolidation curve, which is the relationship between the pressure and the void ratio. The data measured is essential when determining the pre-consolidation pressure, the compression, and recompression tests. The other important parameters that the data can used to determine the coefficient of secondary compression of the sample and the coefficient of consolidation. The significance of determining the consolidation properties include; the estimation of the rate and size of both the secondary and primary consolidation settlement experienced by an earth fill or structure. These estimates are crucial especially in the evaluation and design of engineering structures.

(Missing data) Key findings

(Missing data) Major conclusion

Consolidation test

Introduction

Consolidation can be described as the gradual change in the volume of a fully saturated soil that is subjected to loading and which occurs due to the draining of water in the soil pores. The consolidation process continues until there is a complete dissipation of the pore pressure, which has been generated by the increased in the total stress.

Consolidation test is conducted to find out the decrease in the rate and size of the volume of a laterally confined soil sample goes through when subjected to different amounts of weights. The test is conducted by placing a series of loads to a sample that is laterally confined with a diameter that is four time its height. The observation for each of the vertical compression under each weight takes place within a period of 24 hours. The test is one-dimensional because it does not involve any lateral deformation. All the consolidation parameters derived are one-dimensional.

Experimental procedure

Equipment

  • Actuator used to apply the loading

  • Porous stones

  • Load cell

  • Consolidation ring

  • Filter Paper

  • Loading frame

Procedure

  1. Obtained and prepared a soil sample by using a Shelby tube to trim a [portion of a natural and undisturbed soil. The diameter of the Shelby should be four-time its height.

  2. Collection of extra soil, which was trimmed, placed in moisture pan and used to determine the moisture content of the soil sample.

  3. Obtain the diameter, weight and height measurements of the of the consolidation ring

  4. Put the soil sample into the rind and trim the top and bottom edges using the wire saw then record the results.

  5. Measure the weight of the ring when containing the soil sample

Calculations and results

Moisture content

Container No.

Mass of wet soil + container (m2)

Mass of dry soil + container (m3)

Mass container (m1)

Mass of moisture (m2-m3)

Mass of dry soil (m3-m1)

Void ratio

Moisture contentConsolidation test

=
Consolidation test 1

Mass of ring

Mass of sample + ring

Height of ring

Diameter

Description of Soil Sample (Missing Results)

DIMENSIONS

Initial sample

Total change

Final sample

Diameter
Consolidation test 2

Volume
Consolidation test 3

Height
Consolidation test 4

Area
Consolidation test 5

Loading Step

Stress (Kpa)

Duration(hrs)

5.0 Discussion (Missing Data)

6.0 Conclusions (Missing Data)

References

Ranjan, G. n.d.. Basic and applied soil mechanics. S.l, s.n.].

Young, R. N., & Townsend, F. C. 1986. Consolidation of soils: testing and evaluation : a symposium. Philadelphia, Pa, ASTM.

Appendix I

Raw Data and calculations (Missing data)

Appendix II

Safe working procedure

Appendix III

Risk Assessment