HOW TO IMPROVE BEARING CAPACITY OF SOIL?

Techniques Used for Improving Bearing Capacity of Soil

The following techniques can be used for improving bearing capacity of soil as per the site condition.

  • Increasing depth of foundation
  • Draining the soil
  • Compacting the soil
  • Confining the soil
  • Replacing the poor soil
  • Using grouting material
  • Stabilizing the soil with chemicals

How to improve bearing capacity of soil

1. Increasing Depth of Foundation

At deeper depths, the over burden pressure on soil is higher; hence the soil is more compacted at deeper depth. As a result it shows higher bearing capacity. This is applicable only for cohesionless soils such as sandy and gravelly soils. This method of improving bearing capacity of soil is not applicable if the subsoil material grows wetter as depth increase. This method has a limited use because with increase in depth, the weight and cost of foundation also increases.

2. Draining the Soil

With increase in percentage of water content in soil, the bearing capacity decreases. In case of sandy soil, the bearing capacity may reduce as much as 50% due to presence of water content. Cohesionless soils (i.e. sandy & gravelly soils) can be drained by laying the porous pipes to a gentle slope, over a bed of sand and filling the trenches above the pipes with loose boulders. These trenches subsequently should lead to the nearest well or any water body.

3. Compacting the Soil

If we compact soil using appropriate method, then there will be increase in its density and shear strength. As a result the bearing capacity of soil also increases. There are many methods of compacting soils on site. Few of them are mentioned below.

  • By spreading broken stones, gravel or sand and thereafter ramming well in the bed of trenches.
  • Using an appropriate roller as per the soil type to move at a specified speed.
  • Br driving concrete piles or wood piles and withdrawing piles and subsequently filling the holes with sand or concrete.

4. Confining the Soil

In this method, the soils are enclosed with the help of sheet piles. This confined soil is further compacted to get more strength. This method is applicable for shallow foundations.

5. Replacing the Poor Soil

In this method the poor soil is first removed and then the gap is filled up by superior material such as sand, stone, gravel or any other hard material. In order to do this, first excavate a foundation trench of about 1.5 m deep, and then fill the hard material is stages of 30 cm. Then compact the hard material at every stage. This method is useful for foundations in black cotton soils.

6. Using Grouting Material

This method is applicable for soils where there is presence of pores, fissures or cracks etc underneath the foundation. In this method, poor soil bearing strata is hardened by injecting the cement grout under pressure, because it scales off any cracks or pores or fissures etc. For proper distribution of the cement grout, the ground is bored and perforated pipes are introduced to force the grout.

7. Stabilizing the Soil with Chemicals

This method of improving bearing capacity of soil is costly and applied in exceptional cases. In this method, chemical solutions, like silicates of soda and calcium chloride is injected with pressure into the soil. These chemical along with the soil particles form a gel like structure and develop a compact mass.This is called chemical stabilization of soil and used to give additional strength to soft soils at deeper depths.

6 thoughts on “HOW TO IMPROVE BEARING CAPACITY OF SOIL?”

  1. Dear respective Sir,
    We have a land having SBC of 80 kN/Sqm. We removed weak soil down to 2 m depth and filled up 1 m thick boulder with stone dust from crusher. Is it enough to obtain soil pressure of 163 kN/sqm ? Your kind advice will be awaited.

    Reply
  2. as per soil report the bearing capacity of soil at 2.0 m depth is 3.3t/m 2 and 4.0 m depth is 5.7 t/m2
    For contn. boundary wall of 2.0 m height with 125mm bw with a span of 4.0 m c/c, it is impossible to go beyond 2.0 m from egl .
    is it suggestable fix foundation depth at 2.0 m with 500 mm sand filling

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  3. Kindly suggest best method for to construct two stored building which are 60m*45m app size. where in are as per soil investigation geotech report observed that at meter depth even loose/clay soil observed in coastal area in south India.

    Reply
  4. Dear Surya
    Thanks for the wonderful info.I have a query.
    I had recently purchased a plot in kerala which was filled up by soft red soil for 75% of the land.And depth upto 10-15 feet plus. Below that is hard black rock.I did not know about importance of soil bearing capacity and also did not notice that land was filled up with soft red sand which does not have binding effect.

    Now I am constructing a house (1500 sq feet) with 12 rcc pillars for 2 storey.
    I am now worried that when rains come and when water passes thru my plot , it will also carry sand.Ours is a hilly area. What is the best cost effective way to increase soil bearing capacity to save my building and land from possible landslide and collapse.Thanks a lot in advance for your advice at the earliest.
    jacob

    Reply

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