Experimental Investigation of Various Shell Footings in Cohesive and Cohesionless Soil

  • Kumar M Department of Civil Engineering, Government College of Technology, Coimbatore, Tamilnadu, India.
  • Subagiriraj M Department of Civil Engineering, Government College of Technology, Coimbatore, Tamilnadu, India
Keywords: Cohsionless soil, cohesive soil, Load carrying capacity, Flat and shell footing, improvement factor, shell efficiency, settlement factor

Abstract

The increasing demand of infrastructure development leads to the usage of sandy soils; which possess low bearing capacity. In this regard, this study is to provide a novel solution to counteract the problems faced by the weak soil. The experimental study was carried out on both Flat and Shell models with the corresponding Triangular, Square and Hexagon shapes for both loose and medium dense condition. The models were compared based on their equal plan area. To carry out the experimental work, a model tank of cylindrical shape of dimensions of 50cm diameter and 50 cm height is used. Vertical load were applied to the models and the corresponding settlement were observed. The ultimate load carrying capacity of footing models was calculated and plotted by the load versus settlement graph. From the results, Improvement factor on vertical load carrying of Flat Square footing is 1.75 on loose sand. In dense sand the improvement factor of Flat Square is 1.67. The efficiency of pyramidal shell is 75% and 66.7% on counter flat footing on loose sand and dense sand condition respectively. The settlement characteristic of triangular shell is better than other models on both loose and medium dense conditions. The load carrying capacity and efficiency of square footing having more value among other footing models for both low and medium consistency of clay. In sand the efficiency of shell is greater than in clayey soil, so the shell footings performing better way in sandy soil.

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References

O. Abdulhahz Al-Shenawy, and A. Awad Al-Karni, Derivation of Bearing Capacity Equation For A Two Layered System of Weak Clay Layer Overlaid by Dense Sand Layer, Pertanika J. Sci. & Technol. 13 (2005) 213 – 235.

M.Y. Al- Aghbari, Settlement of shallow square foundation with structural skirts resting on sand, proceedings of the 2ND international Conference on Geotechnical and Geo environmental Engineering In Arid Lands, Riyadh, (2002)189–194.

M.Y. Al-Aghbari and Y.E.A. Mohamedzein, Bearing capacity of strip foundations with structural skirts, J Geotech Geoenviron, 22(2004) 43-57.

J.E. Colmenares, So-Ra Kang, Young-Jin Shin and Jong-Ho Shin, Advances in structural engineering and mechanics, (2013)3020-3040.

R. Jyothi Lekshmi and P. Hashifa Hassan, Model test on bearing capacity of conical shell strip footing on reinforced clay, Int. J. Innov. Res. Sci. Eng. Technol. 4 (2015) 10290-10297.

Kamal Mohamed Hafez Ismail Ibrahim, bearing capacity of circular footing resting on granular soil overlying soft clay, HBRC J. 8 July 2014

Kangkan Sarma, Nayanmoni Chetia, Evaluation of Bearing Capacity for Skirted Foundations on Sand, Indian Geotechnical Conference (2017).

M. A. Mahmoud, F. M. Abdrabbo, Bearing Capacity Tests on Strip Footing Resting On Reinforced Sand Subgrades, Can. Geotech. J. 26 (1989)154–159.

Nissanka Fernando, Eranga Sendanayake, Dulan Sendanayake, Nalin De Silva, The experimental investigation of failure mechanism and bearing capacity of different types of shallow foundations, Civil Engineering Research For Industry – (2011).

Pusadkar, Sunil Shaligram, Behavior of Triangular Shell Strip Footing on Geo reinforced Layered Sand, Int J Adv Sci Eng Inf Technol, 2(2011).

S. K. Singh, Kangujam Monika, Load Carrying Capacity of Shell Foundations on Untreated and Treated Soil, Indian Geotechnical Conference (2016).

G. Yun, And M.F. Bransby, The Undrained Vertical Bearing of Skirted Foundations, Japan. Geotech. Soci. 47(2007) 493-505.

W.R. Azzam , A.M. Nasr, Bearing Capacity Of Shell Strip Footing on Reinforced Sand, J. Adv. Res. Cairo University, 2014

Published
2019-05-30