# Dropping Weight Method -To Determine Soil Bearing Capacity

27th July 2019# 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.

** Read Also**:

How To Verify The Given Bearing Capacity of Any Soil