Adapt Columns Settlement For Free

The stone column technique, also known as vibro-replacement or vibro-displacement, is a ground improvement process where vertical columns of compacted aggregate are formed through the soils to be improved. Stone columns, also known as granular piles, consist of stone aggregates compacted into a vertical hole.

RAMMED STONE COLUMN TECHNIQUE :- In. this technique the granular fill is introduced into a pre-bored hole and compacted by a heavy rammer. with winch bailer and casing. backfill material.

Stone columns mitigate liquefaction by means of two principal ways: 1. By increasing drainage which dissipates excess pore water pressure generated by earthquake loading and, 2. By increasing the SPT values which influence the Cyclic Stress Ratio.

In such circumstances, it becomes essential to improve the foundation soil to address permissible settlements by means of the following:Compacting the soil.Draining the soil, in case of cohesive types.Compacting the soil, in case of cohesion less soils.Confining the soil, increasing stiffness.Grouting.

The construction of stone columns involves creation of a hole In the ground which is later filled with granular fill / stone sand mixture and compacted to required strength. density is laid with a minimum thickness of 0.5m.

Stone columns are used to increase the shear strength of the soil and as such improve the resistance against liquefaction. They are used when the soil is liquefiable, but too silty to use the compaction techniques to improve the properties.

There are two methods for construction of stone column/granular pile. 2. non- displacement method in which the in place soil is taken out during boring to make the hole. The non displacement method is also known as replacement method.