SARDAR PATEL COLLEGE OF

ENGINEERING,BAKROL

BEARING CAPACITY OF SOILBUILDING CONSTRUCTION()

GUIDED by:- GAURAV GOHIL

SR. NO. NAME ENROLLMENT NO.

1 PRAJAPATI MITESH P. 151240106064

2 PRAJAPATI NILESH D. 151240106065

3 PRAJAPATI TIRATH A. 151240106066

BRANCH : CIVIL

What is Soil Bearing Capacity?

• The Bearing Capacity of Soils is perhaps the most important of all the topics in soil engineering.• In geotechnical engineering, Bearing Capacity is the

capacity of soil to support the loads applied to the ground. The bearing capacity of soil is the maximum average contact pressure between the foundation and the soil which should not produce shear failure in the soil.• Soils behave in a complex manner when loaded so,

it is important to know the bearing capacity of soils.

Why is Soil Bearing Capacity required?• The stability of foundation depends on: 1) The bearing capacity of the soil beneath the

foundation. 2) The settlement of the soil beneath the `

foundation.

• There are, therefore, two independent stability conditions to be fulfilled since the shearing resistance of the soil provides the bearing capacity and the consolidation properties determine the settlement.

Important Terminologies related to Soil Bearing Capacity

• Ultimate Bearing Capacity (qu) The ultimate bearing capacity is the gross pressure at the base Of the foundation at which soil fails in shear.

• Net ultimate Bearing Capacity (qnu): It is the net increase in pressure at the base of foundation that cause shear failure of the soil.

• Net Safe Bearing Capacity (qns):

It is the net soil pressure which can be safely applied to the soil considering only shear failure.

• Gross Safe Bearing Capacity (qs):

It is the maximum pressure which the soil can carry safely without shear failure.

• Net Safe Settlement Pressure (qnp):

It is the net pressure which the soil can carry without exceeding allowable settlement

• Net Allowable Bearing Pressure (qna):

It is the net bearing pressure which can be used for design of foundation.

METHODS OF INCREASING SOIL BEARING CAPACITY OF BLACK COTTON SOIL• 1) Increasing Depth of Foundation: In granular soil the bearing capacity increases with the depth due to the confining weight of overlying materials.

• 2 ) Chemical Treatment: In this treatment certain chemicals are grouted in the place of cement grout. The chemical used is such that it can solidify and gain early strength.

• 3) Grouting:Bore holes in sufficient numbers are driven in the ground and cement grout is forced through these under pressureDue to which the bearing capacity of soil is increased. • 4) Compaction of soil: Due to the compaction of soil the bearing capacity of the soil increases resulting in reduction in resting settlements

5) Drainage of soil:

Due to the presence of water in the soil the bearing capacity of the soil is decreased hence by draining out water the void ratio is improved resulting in higher bearing capacity.

6) Confining the soil:

• sometimes the safe bearing pressure of the soil is low because of settlements resulting due to the lateral movement of loose granular soil.• Such a tendency of lateral

movement can be checked by confining the soil , outside the perimeter of foundation area , by driving sheet piles , thus forming an enclosure and confining the soil.

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