The shear resistance of bitumen-coated piles in sand is studied with interface shear tests in a modified direct shear apparatus and pull-out tests on model piles. The interface shear tests are conducted to study the effect of pile material, thickness of coat, normal stress, and rate of shear on pile shear resistance. The shear resistance of bitumen-coated samples and sand is found to be independent of the roughness of the pile material. The bitumen coating reduced shear resistance by more than 90%. Shear resistance reduces with increase in the thickness of coat for a given normal stress and is found to be influenced by the rate of shear. The results of pullout tests conducted to compare the shear behaviour of coated and uncoated model aluminium pipe piles driven in sand are also presented. The pull-out and interface shear tests show a similar response to increase in coat thickness and normal stress. The shear resistance of bitumen-coated piles is found to increase only marginally with the density of the soil. Scale effects in the model tests are also discussed.

SR Gandhi

Department Of Civil Engineering

COATED SAMPLE

DIRECT SHEAR

INTERFACE SHEAR

Model tests

Models (physical)

Normal stress

Pull-out

PULL-OUT TEST

scale effects

SHEAR BEHAVIOUR

SHEAR RESISTANCES

BITUMINOUS MATERIALS

Models

sand

Testing

Piles

BITUMEN

Foundation

Geotechnical engineering

Pile

Pullout test

Shear stress

SHEAR TEST

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Proceedings of the Institution of Civil Engineers: Geotechnical Engineering

This paper reviews the design and construction practices on pile foundation being adopted in India observed over the last three decades. The factors that affect the choice of the pile have been discussed highlighting the necessity of initial field tests prior to the detailed design. A case study is presented where choice of the pile was made based on initial field tests on piles of promising types. The common problems faced during pile construction in each type of pile with possible remedial measures that can improve the performance are described. Various issues in pile design are reviewed with some of the experimental and numerical work carried out on lateral load on piles in slope, pile group effect under lateral load, negative drag force, rock-socketed pile, etc. Finally, the need for more such full-scale field tests and monitoring with instrumentation is emphasized to achieve an optimum pile design along with few case studies on such tests carried out. The review reveals remarkable improvements, both in the design and construction, comparable with that in other countries. © 2015, Indian Geotechnical Society.

Indian Geotechnical Journal

Observations on Pile Design and Construction Practices in India

Who's Who

Burland, Prof. John Boscawen, (born 4 March 1936), Professor of Soil Mechanics, Imperial College (formerly Imperial College of Science and Technology), University of London, 1980–2001, now Emeritus

Journal of Urology

Reviewing for Journals: Ask Not What Your Profession Can Do for You But What You Can Do for Your Profession

Journal	Proceedings of the Institution of Civil Engineers: Geotechnical Engineering
ISSN	13532618
Open Access	No