A brief analysis on using stone column in construction

1. DELHI TECHNOLOGICAL UNIVERSITY
EN-202 (Geotechnical Engineering)
A Brief Analysis on:
“Soil Stabilisation using Stone Column”
Submitted by:
Suman Gupta(2K19/EN/061)
Shailender Singh Sodhi (2K19/EN/051)

2. The primary objective of this work was to improve the bearing capacity of poor ground and reduce the
settlement of structures built on them. Basically this research study is to take into account to provide
information about the extensively used stone column method and how the soil stabilization methods are
used to increase strength of soil, decrease the compressibility of soft and loose fine graded soils and also to
provide the guidance to install the stone column in soil.
OBJECTIVE

3. There are a number of methods available to improve ground the conditions. Before we
discuss about this method it is required to know the ground improvement in detail. In
simple words-ground improvement can be defined as “the process of enhancing the
quality of soil. It mainly refers to the improvement of soil layers. The ground
improvement techniques applied are tools used by the geotechnical engineer for “fixing”
the problems of poor ground, when a poor ground exists at the project site.
INTRODUCTION

4. Literature Review
Based on improvement of a soft soil by stone columns method the three important
factors are-
● The first one is inclusion of a stiffer column material (such as crushed stones,
gravel, and others) in the soft soil.
● The second factor is the densification of the surrounding soft soil during the
installation of stone column.
● The third factor is the acting as vertical drains. Which can occur changes in
both the material properties and the state of stresses in the treated soil mass.
Methods of Stone Column Installation
Stone columns are installed using either top- or bottom-feed systems, either with or
without jetted water. The top-feed method is used when a stable hole can be formed by
the vibratory probe.
Most widely used methods for installation of stone columns are:

5. In the displacement or dry method, native soil is
displaced laterally by a vibratory probe using
compressed air. This installation method is
appropriate where ground water level is lowand in
situ soil is firm.

6. In the replacement or wet method, native soil is replaced by stonecolumns in a
regular pattern where the holes are constructed using a vibratory probe accompanied
by a water jet.
By using this methods we can increase the bearing
capacity of a site to make it possible to use shallow
foundation on the soil. By increasing the stiffness and
environmental condition of soil

7. Market Research
On the basics of research studies we found that The soil stabilization
market is projected to reach USD 27.80 Billion by 2022, from USD
22.09 Billion in 2017, growing at a CAGR of 4.70%.Rapid
urbanization and improved quality & properties of soil stabilization
materials are some of the major factors that are expected to drive the
demand for soil stabilization.

8. In terms of value the asia pacific is
estimated to account for thelargest share in
the global soil stabilization market due to
the rapid urbanization

9. Methodology
This research study involved the usage of extensive primary sources -such as the
latest research papers on soil stabilization and reliable web sources which help him
to trying to extract and collect the useful information about the geotechnical
engineering and to identify the requirements of ground improvements technique
because of the poor ground problems exists at the project site. On further studies of
different type of soil stabilization method and estimated data we came to the point
thatstone column method has the vast potential to improve the ground quality

10. Conclusion
On the bases of brief analysis we draw out the conclusion that use of stone columns as a technique of soil
reinforcement is frequently can be implemented in soft cohesive soil. Stone columns have been successfully
used to support isolated footing, large raft foundations and embankment. Besides this the stone column used
in soft clays has been found to provide moderate increases in load carrying capacity including by significant
reduction in settlement of soft soil. Being granular material used ,consolidation settlement is accelerated and
post construction settlement is minimized.