CE2004 ConsolidationDec09_handout0

CE2004 ConsolidationDec09_handout0 - Consolidation CE2004...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Consolidation CE2004 Consolidation By the end of this session, you should understand: The principles of consolidation theory The oedometer test The concept of compressibility The nature and causes of Pre-consolidation How to perform a simple settlement evaluation Consolidation settlement is of soil surface due to .. of soil volume Due to: Increased load Reduction in water table Presents real . to structures Consolidation = the principle What will control the rate of consolidation? Consolidation is the gradual . of a . of low permeability due to the .. of some of the wateruntil the excess pore water pressure set up by an increase in total stress has completely dissipated . Craig 2004, p227 solids M s SOLIDS solids V s Total mass M water M w WATER water V w M a = 0 air M a AIR air V a voids V v Total volume V Masses Soil Column Volumes All phases will react to increased load - but in different ways, over different time periods - How/Why? Compressibility characteristics What happens to ' during consolidation? What happens to e during consolidation? What is e ? e = V v / V s e = w G s = w s G s = M s V s w A reminder: Measuring consolidation (and swelling) The oedometer test test of soil volume change in response to change in load Oedometer protocol Measure height of sample in consolidation ring (H ) normally fill ring Set recording gauge Apply load Record movement in gauge at set intervals BS1377-5 recommends: 0, 10, 20, 30, 40, 50 seconds 1, 2, 4, 8, 15, 30 minutes 1, 2, 4, 8, 24 hours Continue until no more change occurs Add additional load, and repeat measurement What is happening during consolidation in the cell? = + u s Excess porewater pressure u e leads to drainage until a new state u s is reached Extra load initially taken up by ....
View Full Document

Page1 / 38

CE2004 ConsolidationDec09_handout0 - Consolidation CE2004...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online