Intrusion of Geomesh in Gypseous Soil Under Single Footing

Document Type : Original Article

Author

Engineering College, Civil Department, University of Diyala, Iraq

Abstract

Methods to improve bearing capacity of footing resting of collapsing soil can, in fact, take two approaches, improving soil strength properties and intrusion of reinforcing sorces into soil. The footing is modeled by a square steel plate 0.1 by 0.1 m. The footing is loaded as to have a stress of 40 kPa and settlement is receded in dry and in soaking conditions. Two depths of the geo-mesh reinforcement are used, one B (B is width of footing) and 0.5B. For one B depth, three different square sizes of geo-mesh are used, 4B, 6B, and 8B. For the reinforcement depth of 0.5B the three sizes of the geo-mesh used are, 3.5B, 5.5B, and, 7.5B. Results reveal that the best improvement obtained is the case of square geo-mesh width of 7.5B and located at depth of B/2 under footing, with an improvement in terms of collapse settlement of 35%, and a settlement reduction in dry condition of 50%. The least improvement is the case of square geo-mesh with width of 4B and depth of one B, and it was really negligible, about 4% decrease in collapse settlement. Other cases varied between the two mentioned ratios. For findings of study, author recommends not to use geomesh size less than size of footing and not to place it in a depth more than half footing width. As such, in a whole, the effectiveness of geomesh in reducing the settlement of collapsing soil is obvious if used in proper way.

Keywords

References

1.     Al-Jumaily, F., "Gypsum and its mechanical effect on the engineering properties of soil", Journal of Arab Universities,  Vol. 1, (1994), 40-50.
2.     Clemence, S.P. and Finbarr, A.O., "Design considerations for collapsible soils", Journal of the geotechnical Engineering Division, ASCE,  Vol. 107, No. GT3, Proc. Paper, 16106, (1981), 305-317.
3.     Ismail, H., "The use of gypseous soils", in Symposium on the Gypseous Soils and Their Effect on Strength, NCCL, Baghdad.
4.     James, A. and Lupton, A., "Gypsum and anhydrite in foundations of hydraulic structures", Geotechnique,  Vol. 28, No. 3, (1978), 249-272. doi:10.1680/geot.1978.28.3.249
5.     Noor, S.T., Hanna, A. and Mashhour, I., "Numerical modeling of piles in collapsible soil subjected to inundation", International Journal of Geomechanics,  Vol. 13, No. 5, (2013), 514-526. doi:10.1061/(asce)gm.1943-5622.0000235
6.     Awn, S.H.A. and Abbas, H.O., "Improvement of gypseous soil by compaction and addition of cement", Journal of Engineering and Sustainable Development,  Vol. 16, No. 2, (2012), 74-88.
7.     Ziegler, M., "Application of geogrid reinforced constructions: History, recent and future developments", Procedia Engineering,  Vol. 172, No., (2017), 42-51. doi:10.1016/j.proeng.2017.02.015
8.     Fakhraldin, M.K., "Improvement of loose granular soil by using geogrid reinforcement", Kufa Journal of Engineering,  Vol. 7, No. 3, (2016), 66-79.
9.     Ahmed Kamel, M., Chandra, S. and Kumar, P., "Behaviour of subgrade soil reinforced with geogrid", International Journal of Pavement Engineering,  Vol. 5, No. 4, (2004), 201-209. https://doi.org/10.1080/1029843042000327122
10.   Karim, H.H., Samueel, Z.W. and Jassem, A.H., "Behaviour of soft clayey soil improved by fly ash and geogrid under cyclic loading", Civil Engineering Journal,  Vol. 6, No. 2, (2020), 225-237. doi:10.28991/cej-2020-03091466
11.   Emeka, A.E., Chukwuemeka, A.J. and Okwudili, M.B., "Deformation behaviour of erodible soil stabilized with cement and quarry dust", Emerging Science Journal,  Vol. 2, No. 6, (2018), 383-387. http://dx.doi.org/10.28991/esj-2018-01157
12.   Amli, A., Sabah, A., Al-Ansari, N. and Laue, J., "Study numerical simulation of stress-strain behavior of reinforced concrete bar in soil using theoretical models", Civil Engineering Journal,  Vol. 11, No. 5, (2019), 2349-2358. doi:10.28991/cej-2019-03091416
13.   Lutenegger, A.J. and Saber, R.T., "Determination of collapse potential of soils", Geotechnical Testing Journal,  Vol. 11, No. 3, (1988), 173-178. doi:10.1520/gtj10003j
14.   Muarik, H.O.A.S.M., "Behavior of compacted gypsiferous sandy soil during soaking and leaching process", Journal of Wassit for Science & Medicine,  Vol. 5, No. 1, (2012), 165-176.
15.   Al-Busoda, B.S. and Al-Rubaye, A.H., "Bearing capacity of bored pile model constructed in gypseous soil", Journal of Engineering, Vol. 21, No. 3, (2015), 109-128.
16.   Noman, B.J., Abd-Awn, S.H. and Abbas, H.O., "Effect of pile spacing on group efficiency in gypseous soil", Civil Engineering Journal,  Vol. 5, No. 2, (2019), 373-389. doi:10.28991/cej-2019-03091252
17.   Abbas, H.O., "Improvement of sabkha soil by using geomesh and addition of polycoa", Engineering and Technology Journal,  Vol. 30, No. 4, (2012), 568-576.
18.   Ibrahim, S.K. and Zakaria, W.A., "Effect of vibrating footing on a nearby static–load footing", Civil Engineering Journal,  Vol. 5, No. 8, (2019), 1738-1752. doi:10.28991/cej-2019-03091367
International Journal of Engineering
Volume 33, Issue 9
TRANSACTIONS C: Aspects
September 2020
Pages 1731-1736

Files

Cited by

Share

How to cite

Statistics