What are the effect of water table on bearing capacity of soil?

The position of ground water has a significant effect on the bearing capacity of soil. Presence of water table at a depth less than the width of the foundation from the foundation bottom will reduce the bearing capacity of the soil.

What is the effect of rise of water table on the bearing capacity and the settlement of a footing on sand?

K. Manjunath and A.S. Reddy studied the effect of depth and water table on bearing capacity of rectangular footing. They found that as depth of foundation increases, bearing capacity increases. They found that these is increased in dry density and decrease in optimum moisture content.

Which factors influence the bearing capacity of a purely Cohesionless soil?

Relative density of soil.

What affects the bearing capacity of soil?

In a nutshell, bearing capacity is the capacity of soil to support the loads that are applied to the ground above. It depends primarily on the type of soil, its shear strength and its density. It also depends on the depth of embedment of the load – the deeper it is founded, the greater the bearing capacity.

What happens water table above the base of footing?

Similarly, if soil gets submerged its ability to support the load coming over its unit area is reduced when the water table is above the base of the footing, the submerged weight is used for the soil below the water table for computing the surcharge.

What happens if water table above the base of footing Mcq?

Explanation: When the water table is above the base of the footing, the submerged weight ‘γ’ should be used for the soil below the water table for computing the effective pressure or the surcharge.

When the water table is likely to rise to the base of footing or above the correction factor W shall be taken as?

Clarification: If the water table is located at the depth D or likely to rise at the base of the footing or above, then the value of W’ shall be taken as 0.5.

What are the factors affecting bearing?

The bearing capacity of soil is influenced by many factors for instance soil strength, foundation width and depth, soil weight and surcharge, and spacing between foundations. These factors are related to the loads exerted on the soil and considerably affect the bearing capacity.

How can we increase the bearing capacity of soil?

TECHNIQUES USED FOR IMPROVING BEARING CAPACITY OF SOIL

1. Increasing depth of foundation.
2. Draining the soil.
3. Compacting the soil.
4. Confining the soil.
5. Replacing the poor soil.
6. Using grouting material.
7. Stabilizing the soil with chemicals.

What is safe bearing capacity of soil?

Safe net bearing capacity ( ) : It is the net soil pressure which can be safety applied to the soil considering only shear failure. Allowable Bearing Pressure: It is the maximum soil pressure without any shear failure or settlement failure.

When the water table rises to the ground level the ultimate bearing capacity is reduced about?

When the water table rises to the ground level then the ultimate bearing capacity of a shallow foundation on the sand is reduced to 50\%.

What causes high water table?

Fluctuations in the water table level are caused by changes in precipitation between seasons and years. During late winter and spring, when snow melts and precipitation is high, the water table rises. There is a lag, however, between when precipitation infiltrates the saturated zone and when the water table rises.

What is the effect of water table on safe bearing capacity?

EFFECT OF WATER TABLE ON SAFE BEARING CAPACITY OF SOIL. The position of ground water has a significant effect on the bearing capacity of soil. Presence of water table at a depth less than the width of the foundation from the foundation bottom will reduce the bearing capacity of the soil.

How does the position of ground water affect the bearing capacity?

The position of ground water has a significant effect on the bearing capacity of soil. Presence of water table at a depth less than the width of the foundation from the foundation bottom will reduce the bearing capacity of the soil. The bearing capacity equation incorporating the ground water table correction factors is given below.

What is the correction factor for safe bearing capacity of foundation?

First let us begin with the correction factor When water table is at a depth greater than or equals to the width of foundation, from the foundation bottom, the correction factor is 1. i.e. there is no effect on the safe bearing capacity. Let us assume water table started rising then the effect of comes in to action.

What is the correction factor for water table above the foundation?

Let us assume water table started rising then the effect of comes in to action. The correction factor will be less than 1. When the water table reaches the bottom of foundation, i.e, when b = 0, = 0.5. Now let us assume water table further raises, above the depth of foundation.