# Dropping Weight Method to Determine Soil Bearing Capacity

We can determine the bearing capacity of the soil by using the following two methods.

- Dropping Weight Method
- Method of Slowly Applying Load

In this article, we are discussing the dropping weight method.

## Dropping Weight Method

Dropping weight method is used to determining the approximate value of the soil bearing capacity.

⇨At first, assume a weight W that is dropped from a certain height on the bottom surface of the foundation trench.

⇨Due to falling a weight, an impression made on the soil of the bottom surface of the foundation trench, which is noted.

Now, bearing capacity of the soil can be calculated by establishing the following equation:

Let,

- R = Ultimate resistance offered by the soil.
- h = The height from where weight is dropped and up to the bottom surface of the foundation trench.
- D = Depth of the impression made on soil of the foundation trench.
- A = Cross-sectional area.

We know that the potential energy of the falling weight is equal to the energy lost in penetration.

So we can write,

**Wh = Rd**Or, R =Wh/d

Now, safe bearing capacity of the soil per unit area equal to = R/Af =

**Wh/dAf**where f is the factor of safety.

As it is an approximate method, so it is used only for construction of the minor structure.

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