Analytical And Experimental Studies On Underreamed Pile As Anchor Foundation In Soft Clay

Y.S.Golait*, P.P. Dahale**, Jiwatode.R.N.***
* Professor Emeritus, Ramdeobaba College of Engineering and Management, Nagpur, India.
** Assistant Professor, Ramdeobaba College of Engineering and Management, Nagpur, India.
*** Ex. PG (Geotech.) student, Ramdeobaba College of Engineering and Management, Nagpur, India.
Periodicity:June - August'2014
DOI : https://doi.org/10.26634/jce.4.3.3023

Abstract

Foundations of several civil engineering structures are required to be designed as anchor foundations. The analysis and design of deep anchors in clays are considered by very few researchers and investigators in the reported literature. Conspicuously this aspect appears to be inadequately investigated. The paper attempts to highlight the analysis of deep anchors in soft clays by proposing an idealized load transfer mechanism and the mode of failure of this soil-foundation system. The presently used foundation element for resting light structures on expansive soils, in the form of an underreamed pile, is proposed to be used as an effective deep anchor. With reference to this soil-under-reamed pile system, analytical as well as experimental studies are carried out. The analysis led to a simple and easy way to use equation for estimating the pullout load capacity of ground anchors, in clays of medium to soft consistency. In order to evaluate the validity of theoretical formulation, a detailed experimental program was undertaken. The model studies incorporated under-reamed pile models of three shaft diameters with under-reaming ratio of 2.5, four values of depth factors. The clay 2 soil used in studies had cu=0.24 kg/cm . The observed failure loads were compared with the computed values which revealed that, for under-reamed piles having length larger than 8 times the shaft diameter, there was very close agreement between the above two values.

Keywords

Underreamed Pile, Anchor Foundation, Shaft Resistance

How to Cite this Article?

Golait.Y.S., Dahale,P., and Jiwatode.R.N. (2014). Analytical And Experimental Studies On Underreamed Pile As Anchor Foundation In Soft Clay. i-manager’s Journal on Civil Engineering, 4(3), 25-32. https://doi.org/10.26634/jce.4.3.3023

References

[1]. Balla, A(1961), “The resistance to breaking out of mushroom foundations for pylons”, Proceeding of 5th International Conference on Soil Mechanics and Foundation Engineering, Paris, France, Vol. 1, pp. 569- 576.
[2]. Das, B.M. (1980); “A procedure for estimation of ultimate uplift capacity of foundation in clay”, Journal of Soil and Foundations, Japan, Vol. 20(1), pp. 79.
[3]. Kananyan, A.S. (1963). “EksperimentanoeI sledovanie raboti ashavaniy ankernikh fundamentov”. Osnovaniya i Funamenti, Moscow (in Russian), Vol. 20(1).
[4]. Khadilkar, B.S., Paradkar, A.K., Golait, Y.S.; “Study of rupture surface and ultimate resistance of anchor foundations”, Proceeding of 4th Asian Regional Conference on Soil Mechanics and Foundation Engineering, Bangkok, Thailand, Vol.-1, pp.121-127.
[5]. Mariupolskii, L.G. (1965); “Nisushaya sponsobnost ankernikh foundamnetor, osnovania”, Foundamentii Mikhanika Gruntov, Vol. 3(1), pp. 14-18 (in Russian).
[6]. Matsuo M. (1967); “Study on uplift resistance of footing”, Soils and Foundations, Tokyo, Japan, Vol. 7(4), pp. 1-37.
[7]. Merifield, R.S., Lyamin, A.V., Sloan, S.W. and Yu, H.S. (2003); “Three dimensional lower bound solutions for stability of plate anchors in clay”, Journal of Geotechnical Geo-environmental, ASCE, Vol. 129(3), pp. 243.
[8]. Meyerhof, G.G. and Adams, J.I.(1968); “Ultimate uplift capacity of foundation”, Canadian Geotechnical Journal, Ottawa, Canada, Vol. 5(4), pp. 225-244.
[9]. Patil, S.T. (2006); “Studies on underreamed piles as anchor foundation in saturated black cotton soil”, M.Tech. Dissertation (under guidance of Y.S. Golait) submitted to Nagpur University (unpublished)
[10]. Saeedy, H.S. (1987); “Stability of circular vertical earth anchor”, Canadian Geotechnical Journal, 24(3), pp. 452.
[11]. Sharma, S.K., Dewaikar, D.M. and Patil, M.A. (1998); “Analysis of shallow laid plate anchors”, Proceeding IGC- 1998, New Delhi, India, Vol.1, pp. 95-99.
[12]. Sutherland, H.B. (1988); “Uplift resistance of soils”, Geotechnique, Vol. 38(4), pp. 493-516.
[13]. Vesic, A.S. (1971); “Breakout resistance of objects embedded in ocean bottom”, Journal of soil mechanics foundation engineering, ASCE, Vol. 97(SM-9), pp. 1183- 1203.
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