Principles of Construction of Foundation in Black Cotton Soil: i. Single storey building (clinic) to be constructed on black cotton soil. Foundations will be required to carry 3.5m of 200mm brickwork and small roof load (galvanised roof). The swelling of soil in direct contact with the foundation material causes maximum damage. (1) Foundation loads are limited to 5 tonnes/sq.m if water finds access to the foundations, otherwise it may be about 10 tonnes/sq.m (2) Foundations are taken down to such depths to which the cracks do not extend. Black Cotton Soil Black cotton soil has a tendency to shrink and swell excessively. Assumed that black cotton soil is to a depth that can't be excavated. 04. 40 to 60% of the Black cotton soil (BC soil) has a size less than 0.001 mm. Foundation load is limited to 5.0 tonnes/sqm. Guidance required on adequate foundations. Black cotton soil is most unpredictable soil. Case Study Soil Bearing Capacity in Black Cotton Soil Case Study Site Location Solapur Road, Keshwapur, Hubli Purpose: To procure soil samples for assessing the physical properties, which will help in design and mode of construction of proposed foundation. In addition to this, these soils have very poor bearing capacity, ranging from 5 t/m2 to 10 t/m2. Black cotton soil, a cohesive soil, is considered a problematic soil for civil engineers. Water level not known. Where this soil occurs only in top layer, and where the thickness of this layer does fol exceed 1 to 1.5 m, the entire layer of black cotton soil (or other expansive soil) should be removed, and the foundation should be laid on non-shrinkable non- expansive soil.
This alternate process of swelling and shrinking results in the differential settlement of foundation which in turn causes cracks in building.
If the depth of the black cotton soil at a given site is only 1 to 1.5 m, the entire black cotton soil above the hard bed may be completely removed and the foundation may be laid on the hard bed below. Pile Foundation in Black Cotton Soil: The pile foundation is used to transfer the heavy loads from the structure to hard rock strata which is much deep below the ground level and where shallow foundations or mat foundation is not feasible due to weak or expansive soil in upper layer. iii. The cracks […] As such Black cotton soil (BC soil) has very low bearing … ii. His advice to those building on black cotton soil is that they should get professionals to assess how the type of construction relates with the depth that has to be reached for a solid foundation. if there is accessibility of water to the foundation, otherwise load may be up to 10 tonnes/sqm. The main characteristics of this type of soil are that when it is wet, it swells and exerts pressure of about 16500kg/m 2 and when dry, cracks are developed into the soil upto the depth of 2 to 2.5 m below the ground level. Foundation excavation is extended beyond the depth of cracks. What should be provided in terms of foundations? Black cotton soils and other expansive soils are dangerous due to their shrinkage and swelling characteristics. (1) Foundation loads are limited to 5 tonnes/sq.m if water finds access to the foundations, otherwise it may be about 10 tonnes/sq.m (2) Foundations are taken down to such depths to which the cracks do not extend. Building plan 5m x 8m.
It has characteristics of swelling during rains and shrinking during summer. The swelling of soil in direct contact with the foundation material causes maximum damage. If the depth of the black cotton soil at a given site is only 1 to 1.5m, the entire black cotton soil above the hard bed may be completely removed and the foundation may be laid on the hard bed below. Special Foundation for Black Cotton Soil.
When these type of soil come in contact with water, they swell and when becomes dry, it shrinks. At the liquid limit, the volume change is of the order of 200 to 300% and results in swelling pressure as high as 8 kg/cm 2 / to 10 kg/cm 2.
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This alternate process of swelling and shrinking results in the differential settlement of foundation which in turn causes cracks in building.
If the depth of the black cotton soil at a given site is only 1 to 1.5 m, the entire black cotton soil above the hard bed may be completely removed and the foundation may be laid on the hard bed below. Pile Foundation in Black Cotton Soil: The pile foundation is used to transfer the heavy loads from the structure to hard rock strata which is much deep below the ground level and where shallow foundations or mat foundation is not feasible due to weak or expansive soil in upper layer. iii. The cracks […] As such Black cotton soil (BC soil) has very low bearing … ii. His advice to those building on black cotton soil is that they should get professionals to assess how the type of construction relates with the depth that has to be reached for a solid foundation. if there is accessibility of water to the foundation, otherwise load may be up to 10 tonnes/sqm. The main characteristics of this type of soil are that when it is wet, it swells and exerts pressure of about 16500kg/m 2 and when dry, cracks are developed into the soil upto the depth of 2 to 2.5 m below the ground level. Foundation excavation is extended beyond the depth of cracks. What should be provided in terms of foundations? Black cotton soils and other expansive soils are dangerous due to their shrinkage and swelling characteristics. (1) Foundation loads are limited to 5 tonnes/sq.m if water finds access to the foundations, otherwise it may be about 10 tonnes/sq.m (2) Foundations are taken down to such depths to which the cracks do not extend. Building plan 5m x 8m.
It has characteristics of swelling during rains and shrinking during summer. The swelling of soil in direct contact with the foundation material causes maximum damage. If the depth of the black cotton soil at a given site is only 1 to 1.5m, the entire black cotton soil above the hard bed may be completely removed and the foundation may be laid on the hard bed below. Special Foundation for Black Cotton Soil.
When these type of soil come in contact with water, they swell and when becomes dry, it shrinks. At the liquid limit, the volume change is of the order of 200 to 300% and results in swelling pressure as high as 8 kg/cm 2 / to 10 kg/cm 2.
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