IS Code of practice for design and construction of foundations in soils: General requirements. byBureau of DOWNLOAD OPTIONS. IS (): Code of practice for design and construction of foundations in soils: General requirements. [CED Soil and Foundation Engineering]. Mazdoor Kisan Shakti Sangathan. Jawaharlal Nehru. IS (): Code of practice for design and construction of foundations in soils: General requirements.
|Language:||English, Spanish, Japanese|
|Genre:||Politics & Laws|
|Distribution:||Free* [*Register to download]|
IS Code PDF. June 2, | Author: Suraj Kumar | Category: N/A. DOWNLOAD PDF - MB. Share Embed Donate. Report this link. Short Description. FREE DOWNLOAD PDF IS , Code of practice for design and construction of foundations in soils: General requirements, CLICK HERE. IS . 13 of A N A C T. Relating to Conciliation and Arbitration for the Prevention and. Settlement of Industrial Disputes extending beyond the. Limits of any one.
The extent of this exploration will depend on the site and structure. Code of practice for design and construction of foundations for transmission line towers and poles first revision. M injurious compound in the ground water and soil.
The site should also be explored in detail, where necessary, to ascertain the type consistency, thickness, sequence and dip of the strata. These include mining subsidence, land slips, unstable slopes and creep on clay slopes. These factors shall be observed in detail during site investigation and taken into account in the layout and design of the proposed works. However, if necessary, expert advice regarding the geological and hydrologicai characteristics of the site shall be sought.
The magnitude of the movement and its distribution pver the area of the workings and their vicinity can be roughly estimated. Where future subsidence is likely, care should be taken to design the superstructure and foundation sufficiently strong or sufficiently flexible to cater for probable ground movements. Long continuous buildings should be avoided and large building should be divided into independent sections of suitable size, each with its own foundations.
Expert advice from appropriate mining authority should be sought. On sloping ground on clay soils there is always a tendency for the upper layers of soil to move downhill, the extent, however, depends on the type of soil, the angle of slope, ground water regime and climatic conditions.
Instability may develop even after a long period of apparent stability, particularly in stiff, fissured and over consolidated clay soil. Uneven surface of a slope on virgin ground, curved tree trunks, tilted fence posts, tilted boundary walls, etc, indicate the creep of the surface layers. Areas subject to land slip and unstable slopes shall, therefore, be avoided.
These conditions are simulated, sometimes, by extraneous agencies like trees, boiler installations, furnaces, kilns, underground cables, services and refrigeration installations. These factors shall be studied carefully before designing any foundations.
Shrinkage of clay soils may be increased by the drying effect produced by nearby trees and shrubs. Swelling may occur, if they are cut down. NO trees which grow to a large size shall be planted within 8 m of foundations of buildings. Adequate precautions On the uphill side of a building on a should be taken to protect these. Increase in moisture extent results in substantial loss of bearing capacity in case of certain types of soils which may lead to differential settiements.
On sites liable to be water iogged in wet weather, it is desirrable to determine the contour of. The seasonal variation in the level of the water table is of importance in some cases.
In case of soils with low permeability, the water levels in boreholes or observation wells may take a considerable time to reach equilibrium with ground water Spot readings of Vater level in boreholes may, therefore, give an erroneous impression of the true ground water level. It is generally determined by measuring the water level in the borehole after a suitable time lapse for which a period of 14 hours or more be used as the case may be.
In soils with high permeability, such as sand and gravels, lapse of sometime is ustially suffizient, unless the hole has been sealed with drilling mud.
In these cases it nay be necessary to resort? Where deep excavation is required, the location of water bea,ring strata should be determined with particular care and the water pressure in each should be observed so that necessary precautions may be taken during excavation.
Certain soils have a corrosive action on metals, particular1. In industrial areas, corrosive action may arise from industrial wastes that have been dumped on the site. Chemical analysis of samples of ground water or soil or sometimes both should be done to assess the necessity of speciai precautions. The following are settle of suggested methods: a Dense cement concerete M20 mix or richer may be used to reduce permeability and increase resistance tc attack from sulphates see I : NOTE - The soluble salts are usually sulphates of calcium, magncaiumand sodium.
Water containing these salts gets into the concrete and reacts with the set cement or hydraulic lime. This reaction is accompanied by considerable expansion which leads to the deterioration and cracking of the concrete. The amount of soluble sulphates may be considered excessive from the point of attack on concrete if it is more than 30 parts of SO, per parts of subsoil water or in the case of clays if more than 0.
The details of these methods are given in IS : f. In the case of clayey soils, penetration below the zone where shriakage and swelling due to seasonal weather changes, and due to trees and shrubs are likely to cause appreciable movements. In fine sands and silts, penetration may b9 expected from frost.
On rock or such other weather resisting natural ground, removal of the top soil may be all that is required. In suchcases, the surface shall be cleaned and, if necessary, stepped or otherwise prepared so as to provide a suitable bearing and thus prevent slipping or other unwanted movements. The depth shall also be enough to prevent the rainwater scouring below the footings.
It is necessary in these soils, either to place the foundation bearing at such a depth where the effects of seasonal changes are not important or to make the foundation capable of eliminating the undesirable effects due to relative movement by providing flexible type of construction or rigid foundations.
Adequate load counteraction swelling pressures also provide satisfactory foundations. The shrinkage of clay will be increased by drying effect produced by fast growing and water seeking trees. The range of intluence depends on size and number of trees and it increases during dry periods. Digitizing sponsor Public. Contributor Public. Language English. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them.
For more information: Civil Engineering Section Name: General requirements Number of Amendments: Superceded by: Identifier gov. Identifier-ark ark: Ppi Rights Published under the auspices of the Right to Information Act There are no reviews yet. Be the first one to write a review.