Question

Difference between active earth pressure and passive earth pressure

Answer 1

Active earth pressure:
When the wall moves away from the backfill, there is a decrease in the pressure on the wall and this decrease continues untill a minimum value is reaceh after which their is no reduction in the pressre and the value will become constant. This kind of pressure is known as active earth pressure.

Passive earth pressure:
When the wall moves towards the backfill, there is an increase in the pressure on the wall and this increase continues untill a maximum value is reaceh after which their is no increase in the pressre and the value will become constant. This kind of pressure is known as passive earth pressure.
This means that when the wall is about to slip due to lateral thrust from the backfill, a resistive force is applied by the soil in front of the wall.

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Answer 2

Difference in simple way

Active earth pressure

At the point when the divider moves from the refill, there is an abatement in the weight on the divider and this lessening proceeds until a base worth has come to after which their is no decrease in the weight and the worth will get steady. This sort of weight is known as dynamic earth pressure.  

Passive earth pressure

At the point when the divider moves towards the refill, there is an expansion in the weight on the divider and this increment proceeds until a greatest worth has come to after which their is no increment in the weight and the worth will get consistent. This sort of weight is known as uninvolved earth pressure.