Proceedings - Sixth International Conference & Exhibition on Piling and Deep Foundations, 1996, Bombay, India, (DFI)
Tentative Guidelines for Design of Stone Columns-G.H. Approach
A.R. Katti, R.K. Katti
The stone columns are widely used in the improving the bearing capacity of weak soils mostly for supporting flexible foundations systems. The load carrying capacity of a stone column is complex in nature. The load capacity is derived from the lateral stresses acting on the stone column due to load transmitted from the flexible structure due to deformation to soil mass and which in turn transmits lateral pressure in o3 direction. The load capacity is also function of the 0 value of the stone column, cohesion of the surrounding soil, Ko and Tb2 of surrounding soil including passive resistance developed to lateral deformation of the stone column. The assessment of axial and radial deformation is much more complex. Recently Katti et. Al. Have developed a method based on a granular heap approach and computed with equivalent 0e, which combines the effect of o3a and equivalent volume concept to estimate radial and axial strains. In this paper an attempt is made to put forward guidelines for design of stone column accounting for both stability with respect to shear and also with respect to settlement. The estimate of settlement is based on the internal properties of stone column and surrounding soil. It is considered thus that the settlements computed are more realistic.
|article #415; publication #35 (IC-1996)|