[토질역학] consolidation(영문)

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레포트 > 공학계열
2010.08.20
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[토질역학] consolidation(영문)

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[토질역학] consolidation(영문)에 대한 자료입니다.

1. INTRODUCTION
2. P ROBLEM STATEMENT
3. APPROACH
4. DISCUSSION
5. CONCLUSION

본문내용

When this occurs in a soil that is saturated with water, water will be squeezed out of the soil. The magnitude of consolidation can be predicted by many different methods. In the Classical Method, developed by Karl von Terzaghi, soils are tested with an oedometer test to determine their compression index. This can be used to predict the amount of consolidation. Consolidation is the removal of water from soil. In other words, it is the squeezing out of water from the soil to make it more dense.
(http://en.wikipedia.org/wiki/Consolidation_(soil))
It is very important to note that unlike settlement in sands and other coarse grained soil, consolidation settlement of fine grained soil does not occur immediately. Hence, it is common practice to ensure that the consolidation process is expedited and that most of the consolidation takes place during the various phases of construction.
(http://kshitija.wordpress.com/2006/11/20/consolidation-of-soil/)
1) Primary consolidation
This method assumes consolidation occurs in only one-dimension. Laboratory data is used to construct a plot of strain or void ratio verses effective stress where the effective stress axis is on a logarithmic scale. The plot's slope is the compression index or re-compression index. The equation for consolidation settlement of a normally consolidated soil can then be determined to be:
Cc can be replaced by Cr (the re-compression index) for use in over-consolidated soils where the final effective stress is less than the pre-consolidation stress. When the final effective stress is greater than the pre-consolidation stress, the two equations must be used in combination to model both the re-compression portion and the virgin compression portion of the consolidation process, as follows:
2) Secondary Consolidation
Secondary consolidation is the compression of soil that takes place after primary consolidation. Secondary consolidation is caused by creep, viscous behavior of the clay-water system, compression of organic matter, and other processes. In sand, settlement caused by secondary compression is negligible, but in peat, it is very significant.
Secondary consolidation is given by the formula

(http://en.wikipedia.org/wiki/Consolidation_(soil))

#토질역학 #consolidation #영문 #토질 #역학

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