IS 13063 -1991 Code Book PDF free download

IS 13063 -1991 Code Book PDF free download


This lrdian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Rock Mechanics Sectional Committee had been approved by the Civil Engineering Division Council. Shallow foundations cover such type of foundations in which the load transfer is directly on the bearmg strata and whose width is greater than its depth. 3 m from natural ground level. Depth of foundation is normally up to Since most unweathered intact rocks are stronger and less compressible than concrete, the determination of allowable bearing pressure on such rocks may be unnecessary. However, Intact rock masses without weathered zones, joints or other discontinuities are encountered rarely in nature. The existence or location of specific discontinuities of foundation rocks often remain unknown until the rock mass is exposed by excavation. Thus, design engineers should be aware of dangers associated with the hetrogeneity, anisotropy and unfavourable rock conditions. This is because overstressing a rock foundation may result in large differential settlements tilts or perhaps sudden failure. In the formulation of this standard due weightage has been given to the standards and practices prevailing in different countries and that in our country. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in
accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised)‘. The number of significant places retained in the rounded off value should be the same as that of the specified value
in this standard.



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