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What are the bearing capacity values of different types of soils such as clay, sand, gravel, rocks etc.?
Which type of foundation is best for black cotton soil?
Depending on the structural needs one can choose shallow, deep as well as mat foundation. The thing that matters is which type of structure is going to be built. Thank you!
Depending on the structural needs one can choose shallow, deep as well as mat foundation. The thing that matters is which type of structure is going to be built.
Thank you!
See lessWhat is the difference between Safe Bearing Capacity and Gross Bearing Capacity?
Hi, In gross bearing capacity, the gross load is taken. Loads from the superstructure, self-weight of the foundation, and overburden pressure are the gross loads. Gross bearing capacity value is not taken in design as it is very high. Safe bearing capacity is the bearing capacity value that neglectsRead more
Hi,
In gross bearing capacity, the gross load is taken. Loads from the superstructure, self-weight of the foundation, and overburden pressure are the gross loads. Gross bearing capacity value is not taken in design as it is very high.
Safe bearing capacity is the bearing capacity value that neglects the overburden pressure and stress due to the footing weight. It is obtained by considering the factor of safety, i.e. net load is taken into consideration. More detailed explanation is given below.
GROSS BEARING CAPACITY OF SOIL (qu)
NET ULTIMATE BEARING CAPACITY OF SOIL (qnu)
SAFE BEARING CAPACITY OF SOIL
What are the factor affecting in selection of foundation ?
Factors affecting the selection of foundation: Factors affecting the selection of foundation based on politics to basic criteria: Based on soil condition Based on loads from the building 1. based on soil condition: The shallow foundations are most preferred Foundation whenever the soil close to theRead more
Factors affecting the selection of foundation based on politics to basic criteria:
1. based on soil condition:
2. based on loads from the building:
Thank you.
See lessWhat is Pedestal in Column? What is the minimum steel criteria of it?
When the height of member is less than 3times the least lateral dimensions of column it is termed as pedestal whereas when the value is greater than 3times least lateral dimension it is termed as column. For Pedestals (whose effective length is less than three times the least lateral dimension) theRead more
When the height of member is less than 3times the least lateral dimensions of column it is termed as pedestal whereas when the value is greater than 3times least lateral dimension it is termed as column.
For Pedestals (whose effective length is less than three times the least lateral dimension) the minimum reinforcement is specified as 0.15 percent cross sectional area of concrete.
See lessWhat is the step by step procedure for construction of foundation for a building? How the foundation construction is carried out at site?
Step by Step procedure for construction of building foundation on an organised construction site can be as below: First step is to write a method statement involving scope of work, references, count and type equipments and labour required and requirements . Ensure you have approved drawings good foRead more
Step by Step procedure for construction of building foundation on an organised construction site can be as below:
Hope this helps.
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Why is the main reinforcement provided on the longer side of raft footing?
The longest span is in more critical section due to which main reinforcement is provided on the longer span. The longest span has to bear a higher bending moment. This is because the uplift pressure from the soil below will be equal in all locations, but the moment developed at the longer span willRead more
The longest span is in more critical section due to which main reinforcement is provided on the longer span. The longest span has to bear a higher bending moment. This is because the uplift pressure from the soil below will be equal in all locations, but the moment developed at the longer span will be higher because of a long arm. Its a uniformly distributed load and so it produces a larger moment on a longer beam. Thus, the main reinforcement is provided in longer span.
See lessWhat is the importance of timbering in trenches for foundations?
Timbering is a method of providing temporary support to the side of the trench and is sometimes called planking and strutting. It is a method to prevent trench side soil against the collapse. If the soil is not hard then during deep excavation the sides of the trench collapse. The sides of the trencRead more
Timbering is a method of providing temporary support to the side of the trench and is sometimes called planking and strutting. It is a method to prevent trench side soil against the collapse. If the soil is not hard then during deep excavation the sides of the trench collapse.
The sides of the trench are timbering to prevent collapse.
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aviratdhodare
Follwoing are the values of safe bearing capacity as per IS:1904–1978 - Rocks - a) hard sound rock - 330 t/m2 or 3240 KN/m2 b) leminated rock - 165 t/m2 or 1620 KN/m2 c) residual deposit of shattered and broken rocks- 90 t/m2 or 880 KN/m2 d) soft rock - 45 t/m2 or 440 KN/m2 Non Cohesive Soil (sandRead more
Follwoing are the values of safe bearing capacity as per IS:1904–1978 –
Rocks –
a) hard sound rock – 330 t/m2 or 3240 KN/m2
b) leminated rock – 165 t/m2 or 1620 KN/m2
c) residual deposit of shattered and broken rocks- 90 t/m2 or 880 KN/m2
d) soft rock – 45 t/m2 or 440 KN/m2
Non Cohesive Soil (sand & gravel ) –
a) compact gravel, sand and gravel – 45 t/m2 or 440 KN/m2
b) compact and dry coarse sand – 45 t/m2 or 440 KN/m2
c) compact and dry medium sand – 25 t/m2 or 245 KN/m2
d) find sand – 15 t/m2 or 150 KN/m2
e) loose gavel or sand – 25 t/m2 or 245 KN/m2
f) loose and dry fine sand – 10 t/m2 or 100 KN/m2
Cohesive soil –
a) hard or stiff clay, soft shale – 45 t/m2 or 440 KN/m2
b) medium clay – 25 t/m2 or 245 KN/m2
c) moist clay and sand clay mixture – 15 t/m2 or 150 KN/m2
d) soft clay – 10 t/m2 or 100 KN/m2
e) very soft clay – 5 t/m2 or 50 KN/m2
f) black cotton soil , peat – by soil investigation
This is bit difficult to state like this. Generally, in fields, we deal with layered soil systems where in you need to work out settlement of each layer and then compare the same to allowable settlement of the subject structure. The allowable settlement for each structure in different and hence the criterion changes all the time.
More than shear criteria, the settlement criteria generally governs the safe bearing capacity of a soil. So, it is difficult to standardize the bearing capacity values in case of soils. May be, in the case of rock, you can standardize the values as the rock does not settle more than 3–4 mm.
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