Enhancing the Ability of the Square Footing to Resist Positive and Negative Eccentric-inclined Loading Using an Inclined Skirt
محتوى المقالة الرئيسي
الملخص
Shallow and inclined skirted foundations on 30% sandy soil were examined in the experiment program. The study examined the effects of positive and negative eccentric-inclined loading on foundations. Experimental testing was done in a 600 × 600 mm box with a 50 x 50 mm square footing with a 10 mm thickness. The skirt angles were 10°, 20°, and 30°, and the skirt depth was Ds was 0.5 B. Results showed that using skirts significantly increases load-bearing capacity and decreases tilting. Tilting reduces with a skirt, and skirt inclination (alpha) increases with similar loads. Inclined skirts decrease tilt by (2.3% to 0.66%) at e was 0.15 B, load angle (beta) was 15°, and alpha was 30° in the negative case. Tilting increases with eccentricity. As load inclination grows, unskirted and skirted foundations slide and rotate. For the positive case, the tilting decreases from 10% to 2% with e was 0.15 B, loading angle (beta) was 15°, and alpha was 30° with an inclination skirt. The amount of horizontal displacement of the skirted foundation is more than that of the unskirted foundation when comparing the failure load for the unskirted foundation with the same load for the skirted foundation. Loading a foundation without a skirt causes significant settlement and little horizontal displacement. Increasing the load angle is effective since it greatly affects horizontal displacement. In some situations, such as a negative eccentric-inclined load with Ds was 0.5 B, beta was 15, and e was 0.05 B, the influence of the loading angle may be decreased once failures with eccentricity. When eccentricity increases while the load angle (beta) remains constant, the horizontal displacement of a negative eccentric-inclined load reduces.
تفاصيل المقالة
القسم
كيفية الاقتباس
المراجع
Al-Saidi, A.A.H., 2009. Evaluation The Behaviour of Reinforced Loose Sand under Inclined Loading. Journal of Kerbala University, 7(3), pp.98–108.
Acosta-Martinez, H.E., Gourvenec, S.M., and Randolph, M.F., 2008. An experimental investigation of a shallow skirted foundation under compression and tension, Soils and Foundations, 48(2), pp. 247–254. Doi:10.3208/sandf.48.247.
Al-busoda, B.S., and Salman, R., 2013. Bearing capacity of shallow footing on compacted filling dune sand over reinforced gypseous soil. Journal of Engineering, 19(5), pp. 532–542. Doi:10.31026/j.eng.2013.05.01.
Al Mosawe M.J., Al-Saidi, A.A, Jawad, F.W.,2008. Improvement of soil using geogrids to resist eccentric loads. Journal of engineering, 14(4). pp. 3198-3208. Doi:10.31026/j.eng.2008.04.25
Al Mosawe MJ, Al Saidi A.A., Jawad FW., 2010. Bearing capacity of square footing on geogrid reinforced loose sand to resist eccentric load. Journal of Engineering, 16(2). pp. 4990-4999. Doi: 10.31026/j.eng.2010.02.17.
Abd-Alhameed, H.J., and Albusoda, B.S., 2022. Impact of eccentricity and depth-to-breadth ratio on the behavior of skirt foundation rested on dry gypseous soil. Journal of the Mechanical Behavior of Materials, 31(1), pp. 546-553. Doi:10.1515/jmbm-2022-0057.
AL-Kinani, A.M., and Ahmed, M.D., 2020. Field study of the effect of jet grouting parameters on strength based on tensile and unconfined compressive strength. In IOP Conference Series: Materials Science and Engineering, 737(1). pp. 012083. IOP Publishing. Doi:10.1088/1757-899X/737/1/012083.
Albusoda, B.S., and Al-Anbary, L.A., 2016. Performance assessment of pile embedded in expansive soil. Al-Khwarizmi Engineering Journal, 12(2), pp.1-9. Doi:10.1155/2021/5582197.
Aljuari, K., Fattah, M., and Alzaidy, M., 2023. Behavior of circular skirted footing on gypseous soil subjected to water infiltration. Journal of the Mechanical Behavior of Materials, 32(1), P. 20220252. Doi:10.1515/jmbm-2022-0252.
ASTM D 2049-64, 1969. Standard Test Methods for Calculation of Relative Density. Annual Book of ASTM standards. American Society for Testing and Materials, Philadelphia, United States.
ASTM D 4253, 2016 Standard Test Methods for Maximum Index Density and Unit Weight of Soils Using a Vibratory Table. Annual Book of ASTM Standards. American Society for Testing and Materials, Philadelphia, United States.
ASTM D 4254, 2006 Standard Test Methods for Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density. Annual Book of ASTM Standards. American Society for Testing and Materials, Philadelphia, United States.
ASTM D3080/D3080M, 2011. Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions. ASTM International, West Conshohocken, PA.
ASTM D6913/D6913M, 2017. Standard test methods for particle-size distribution (graduation) of soils using sieve analysis. Chonshohocken, PA: ASTM International.
ASTM D854, 2014. Standard test methods for specific gravity of soil solids by water pycnometer. ASTM International, West Conshohocken, PA, www.astm.org.
Bieganousky, W.N., and Marcuson, W.F., 1976. Uniform placement of sand. Journal of Geotechnical Engineering Div. , ASCE, 102(GT.3), pp. 229-233.
Bachay H.A., and Al-Saidi A.A., 2022. The optimum reinforcement layer number for soil under the ring footing subjected to inclined load. Journal of Engineering, 28(12). pp., 18-33. Doi:10.31026/j.eng.2022.12.02.
Bashir, K., Shukla, R., and Jakka, R.S., 2022. Lateral capacity of skirted footing resting on level ground. in Lecture Notes in Civil Engineering. pp., 59-66. Doi:10.1007/978-981-16-5673-6_5.
Fazel, A.H.S., and Bazaz, J.B., 2020. Behavior of eccentrically inclined loaded ring footings resting on granular soil. International Journal of Engineering, Transactions B: Applications, 33(11), pp. 2146–2154. Doi:10.5829/ije.2020.33.11b.04.
Gnananandarao, T., Dutta, R.K. and Khatri, V.N., 2020. Model studies of plus and double box shaped skirted footings resting on sand. International Journal of Geo-Engineering, 11, pp.1-17. Doi:10.1186/s40703-020-00109-0.
Gnananandarao, T., Onyelowe, K.C., Khatri, V.N., and Dutta, R.K., 2023. Performance of T-shaped skirted footings resting on sand. International Journal of Mining and Geo-Engineering, 57(1), pp. 65-71. Doi:10.22059/IJMGE.2022.340418.594955
Cheng, Y., Cai, X., Mo, H., and Gu, M., 2023. Numerical analysis on the behavior of floating geogrid-encased stone column improved foundation. Buildings, 13(7), p.1609. Doi:10.3390/buildings13071609
Hadi, D.H., Waheed, M.Q., and Fattah, M.Y., 2021. Effect of piles number on the behavior of piled raft foundation. Engineering and Technology Journal, 39(7), pp.1080-1091. Doi: 10.30684/etj.v39i7.1795
Jawad, F.W., 2009. Improvement of loose sand using geogrids to support footing subjected to eccentric loads. MSc. Thesis, University of Baghdad, Iraq.
Khatri, V.N., Debbarma, S.P., Dutta, R.K., and Mohanty, B., 2017. Pressure-settlement behavior of square and rectangular skirted footings resting on sand. Geomechanics and Engineering, 12(4), pp.689-705. Doi:10.12989/gae.2017.12.4.689.
Kirtimayee, B., and Samadhiya, N.K., 2022. Behavior of loose geogrid skirted square footing resting on reinforced sand subjected to eccentric and inclined loading. Indian Geotechnical Journal, 52(4), pp. 895–906. Doi:10.1007/s40098-022-00624-0.
Lepcha, O.N., Deb, P., and Pal, S.K., 2023. Parametric studies on skirted foundation resting on sandy soil. Lecture Notes in Civil Engineering, 296, pp. 297–309. Doi:10.1007/978-981-19-6513-5_26.
Pusadkar, S.S., and Tejas Bhatkar, M., 2013. Behaviour of Raft Foundation with Vertical Skirt Using Plaxis 2d. International Journal of Engineering Research, 7(6), p. 20. www.ijerd.com.
Saha Roy, S. and Deb, K., 2017. Bearing capacity of rectangular footings on multilayer geosynthetic-reinforced granular fill over soft soil. International Journal of Geomechanics, 17(9), p.04017069. Doi:10.1061/(asce)gm.1943-5622.0000959.
Sajjad, G., and Masoud, M., 2018. Study of the behaviour of skirted shallow foundations resting on sand. International Journal of Physical Modelling in Geotechnics, 18(3), pp. 117–130. Doi:10.1680/jphmg.16.00079.
Saleh, N.M., Alsaied, A.E., and Elleboudy, A.M., 2008. Performance of skirted strip footing subjected to eccentric inclined load. Electronic Journal of Geotechnical Engineering, 13 F(January 2008).
Sasikumar, A., 2008. Behaviour of circular skirted footing resting on sea sand. International Research Journal of Engineering and Technology, 9001, pp. 6–8.
Satria, I.F., Susanto, A., and Listyawan, A.B., 2018. Method to increase ultimate bearing capacity of skirted circular footing method to increase ultimate bearing capacity of skirted. In AIP Conference Proceedings, 1855(1). AIP Publishing. Doi:10.1063/1.4985458.
Terzaghi, K., 1943. Theoretical Soil Mechanics, Wiley, New York.
Thakare, S.W. and Shukla, A.N., 2016. Performance of rectangular skirted footing resting on sand bed subjected to lateral load. International Journal of Innovative Research in Science, Engineering and Technology, 5(6), pp.11075-11083. Doi:10.15680/IJIRSET.2015.0506182.
Örnek, M., Çalişici, M., Türedi, Y. and Kaya, N., 2021. Investigation of skirt effect on eccentrically loaded model strip footing using laboratory tests. Soil Mechanics and Foundation Engineering, 58(3), pp.215-222. Doi:10.1007/s11204-021-09731-1.