Bearing capacity improvement using micropiles a case study

Babu, Sivakumar GL and Murthy, Srinivasa BR and Murthy, DSN and Nataraj, MS (2004) Bearing capacity improvement using micropiles a case study. In: Geosupport 2004, drilled shafts, micropiling, deep mixing, remedial methods, and specialty foundation systems, proceedings of sessions of the geosupport conference:Innovation and cooperation in the geo-industry, 29-31, January, 2004, Orlando, Florida, pp. 1-8.

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Abstract

Micropiles have been used effectively in many applications of ground improvement to increase the bearing capacity and reduce the settlements particularly in strengthening the existing foundations. Frictional resistance between the surface of the pile and soil and the associated group/network effects of micropiles are considered as the possible mechanism for improvement. This paper deals with a case study in which micropiles of 100 mm diameter and 4 m long have been used to improve the bearing capacity of foundation soil and in the rehabilitation of the total building foundation system. The micropiles were inserted around the individual footings at inclination of 70 degrees with the horizontal. The actual design for retrofitting was based on the assumption that the vertical component of the frictional force between the soil and the micropile resists the additional load coming from the structure over and above the bearing capacity. The technique was successful and the structure did not show any signs of distress later. Detailed finite element analysis conducted validated the suggested treatment. The paper describes the case study, the method of treatment adopted in the field and the results of numerical analysis.

Item Type:	Conference Paper
Publisher:	American Society of Civil Engineers
Additional Information:	This paper is a part of Geotechnical special Publication No. 124
Keywords:	Bearing capacity improvement;Micropiles;Finite Element Modelling
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	07 Mar 2005
Last Modified:	19 Sep 2010 04:12
URI:	http://eprints.iisc.ac.in/id/eprint/275

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