Agricultural Engineering Exam  >  Agricultural Engineering Notes  >  Soil Mechanics Notes- Agricultural Engineering  >  Over Consolidation Ratio - Consolidation Test - Consolidation of Soil, Soil Mechanics

Over Consolidation Ratio - Consolidation Test - Consolidation of Soil, Soil Mechanics | Soil Mechanics Notes- Agricultural Engineering PDF Download

Over Consolidation Ratio

Casagrande (1936) proposed to determine the pre-consolidation stress from e – log σv' plot as shown in Figure 23.4. Locate the point O where there is smallest radius of curvature. Draw a line OA parallel to stress or x axis. Draw a tangent OB at point O. Draw the line OC such that it bisects the angle AOB. Extend the straight portion of the e – log σv' plot. The stress corresponding to the point of intersection of extended line and OC line is the pre-consolidation pressure the soil was subjected.  If the present effective overburden pressure σ'v0 is equal to the preconsolidated pressure σc'  (maximum past effective overburden pressure), the soil is normally consolidated soil. However, if σ'v0 < σc', the soil is overconsolidated. Thus, overconsolidation ratio (OCR) is defined as: OCR = σc'/σ'v0.

Over Consolidation Ratio - Consolidation Test - Consolidation of Soil, Soil Mechanics | Soil Mechanics Notes- Agricultural Engineering

Fig. 23.4. Determination of preconsolidation stress.

 

The document Over Consolidation Ratio - Consolidation Test - Consolidation of Soil, Soil Mechanics | Soil Mechanics Notes- Agricultural Engineering is a part of the Agricultural Engineering Course Soil Mechanics Notes- Agricultural Engineering.
All you need of Agricultural Engineering at this link: Agricultural Engineering
64 docs
Related Searches

ppt

,

Soil Mechanics | Soil Mechanics Notes- Agricultural Engineering

,

Free

,

Over Consolidation Ratio - Consolidation Test - Consolidation of Soil

,

Soil Mechanics | Soil Mechanics Notes- Agricultural Engineering

,

past year papers

,

Summary

,

Important questions

,

MCQs

,

Objective type Questions

,

Viva Questions

,

pdf

,

Exam

,

Extra Questions

,

Sample Paper

,

Semester Notes

,

Over Consolidation Ratio - Consolidation Test - Consolidation of Soil

,

video lectures

,

mock tests for examination

,

Soil Mechanics | Soil Mechanics Notes- Agricultural Engineering

,

Over Consolidation Ratio - Consolidation Test - Consolidation of Soil

,

shortcuts and tricks

,

Previous Year Questions with Solutions

,

study material

,

practice quizzes

;