In Bligh Creep Theory [L/H] is called as:a)Creep Lengthb)Hydraulic Gra...
Bligh’s Creep Theory:
- Bligh assumed that the percolating water follows the outline of the base of the structure which is in contact with the subsoil.
- The length of the path traversed by the percolating water is called the length of creep or creep length.
- He further assumed that the head loss per unit length of creep (i.e. H/L) which is called hydraulic gradient is constant throughout the percolating passage i.e. Loss of head is proportional to length of the creep.
- The reciprocal of hydraulic gradient (i.e. L/H) is known as Bligh’s Coefficient of creep.
Where, C lies between 5 and 15 and depends on the type of soil.
To ensure safety against piping failure, L
req ≥ CH
Note:-
Percolation Coefficient:
It is defined as the ratio of coefficient of permeability to porosity of soil.
In Bligh Creep Theory [L/H] is called as:a)Creep Lengthb)Hydraulic Gra...
Bligh Creep Theory and Coefficient of Creep
Bligh Creep Theory is a concept in soil mechanics that explains the phenomenon of soil creep. Soil creep refers to the gradual movement of soil downslope under the influence of gravity. It is a slow and continuous process that occurs over a long period of time.
One of the key parameters used in Bligh Creep Theory is the Coefficient of Creep, which is denoted by the symbol (L/H). Let's understand what this term represents and why it is called the Coefficient of Creep.
Understanding the Coefficient of Creep
The Coefficient of Creep, (L/H), is defined as the ratio of the creep length (L) to the height of the slope (H). It is a dimensionless quantity that provides an indication of the extent of soil creep in a given slope.
Interpretation of the Coefficient of Creep
The Coefficient of Creep can be interpreted as follows:
- If the value of (L/H) is less than 0.1, it indicates that the slope is stable and there is no significant soil creep.
- If the value of (L/H) is between 0.1 and 1, it suggests that the slope is undergoing moderate soil creep, and there may be some movement of soil particles downslope.
- If the value of (L/H) is greater than 1, it signifies that the slope is experiencing significant soil creep, and there is a high potential for slope failure.
Significance of the Coefficient of Creep
The Coefficient of Creep is an important parameter in the analysis and design of slopes, especially in geotechnical engineering. It helps engineers to assess the stability of slopes and evaluate the potential for soil movement.
By calculating the Coefficient of Creep for a given slope, engineers can determine the level of soil creep and make informed decisions regarding slope stabilization measures. It provides a quantitative measure of the extent of soil creep, allowing engineers to design appropriate countermeasures to mitigate the risks associated with slope instability.
Conclusion
In Bligh Creep Theory, the Coefficient of Creep (L/H) is an essential parameter that helps in understanding the extent of soil creep in a slope. It is a dimensionless ratio that provides valuable insights into the stability of slopes and aids in the design of appropriate slope stabilization measures.
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