Settlement of Shallow Foundation in Dry Sand Under an Earthquake
Engineering and Technology Journal,
2021, Volume 39, Issue 8, Pages 1206-1215
AbstractSeismically induced settlement of buildings with shallow foundations resting on dry sand soils has resulted in severe damage in recent earthquakes. A multi-degree of freedom shaking table and a fixed container were manufactured and used to study the foundation settlement. Series of shaking experiments on the shallow foundation situated in a center of the container and atop of a dry sandy soil has been performed to identify the mechanisms involved to calculate the foundation settlement induced by earthquake shaking. In this research, the important factors are identified, including shaking intensity, the soil relative density, the degree of freedom and the building’s weight. Two relative densities (55 % and 80%) are used and three local magnitudes of earthquakes (5.8, 6.4, and 7.2) (Anza, Jalisco, and Guerrero) respectively with one and two degrees of freedom. The results of the shaking indicated that shallow foundation settlement on the dry sand increases with the increase of the local magnitude of earthquakes and maximum acceleration. In the case of Anza, the percentage decrease in the settlement between the relative density of 55% and 80% for systems (x and xy) is (47% and 42%) respectively. While in the case of Jalisco and Guerrero, the percentage decreases in their settlement and for the same systems is (11% and 57%), (36% and 36%) respectively. The degree of freedom has an impact on the foundation settlement; it is proportional to the degree of freedom. Also, the results show that the settlement decreases when the relative density of sand increases.
- A triple-axis shaking table is manufactured to simulate the history of earthquakes.
- A settlement in two directions shaking is more than it in one direction shaking.
- A freedom degree has an impact on foundation settlement and is proportional to it.
- Local magnitude & max. acceleration increases settlement for all directional shaking.
- Under shaking, soil particles are re-orientated, and voids in the soil are reduced.
 M. A. Al-Neami, F. H. Rahil and Yassein H. Al-Ani, “Behavior of cohesive soil reinforced by polypropylene fiber,” Engineering and Technology Journal, Vol. 38, Part A, No. 06, pp. 801-812, 2020.
 S.L.FKRAMER, “Geotechnical Earthquake Engineering”. Prentice-Hall, 2006.
 R. W. Day, Geotechnical Earthquake Engineering Handbook: With the International Building Code. McGraw-Hill Professional, 2012.
 A. Grantz, G. Plafker, and R. Kachadoorian, “Alaska’s Good Friday earthquake”, A preliminary geologic evaluation. US Department of the Interior, Geological Survey, 1964.
 M. L Silver, and H.B. Seed, “Volume changes in sands during cyclic loading”. Journal of Soil Mechanics and Foundations, Vol. 97, Issues 9, pp. 1171-1182, 1971.
 H. B. Seed, and M. L. Silver, “Settlement of dry sands during earthquakes”. Journal of Soil Mechanics and Foundations, Vol. 98, Issues 4, pp.381-397 1972.
 R. Pyke, H. B. Seed, and C.K. Chan, “Settlement of sands under multidirectional shaking”. Journal of Geotechnical and Geoenvironmental Engineering, Vol. 101, Issue 4, pp. 379-39. 1975.
 K. Tokimatsu, and H.B. Seed, “Evaluation of settlements in sands due to earthquake shaking. Journal of Geotechnical Engineering, Vol.113, No. 8, pp. 861–878, 1987.
 J. A. Knappett, K. Stuart, H. Haig, and S. P. Gopal Madabhushi,“Mechanisms of Failure for Shallow Foundations under Earthquake Loading.” Soil Dynamics and Earthquake Engineering, Vol. 26 pp. 91-102, 2006.
 Y. R.Chen, S.C. Hsieh, J.W. Chen, and C.Y. Lee, “Evaluation of earthquake-induced settlement in dry sand layers,”Electron. J. Geotech. Eng, Vol. 14, pp 1-19, 2009
 K. T. Shlash, M.A. Al-Neami and A.M. Ali, “Effect of Using Equivalent Driving Energy on Small Model Driven Pile Capacity,” Engineering and Technology Journal, Vol. 31, Part A, No. 07, pp. 1292-179-1238, 2013.
 K. Terzaghi, “Theoretical Soil Mechanics”, Wiley, New York, 1973.
 ASTM. American Society of Testing and Materials, Standard Test Method for Specific Gravity of Soil Solids by Water Pycnometer" ASTM D854, West Conshohocken, Pennsylvania, USA, 2006.
 ASTM. American Society of Testing and Materials, Standard Test Method for Classification of Soils for Engineering Purposes (Unified Soil Classification System)" ASTM D2487-06, West Conshohocken, Pennsylvania, USA, 2006.
 ASTM. American Society of Testing and Materials, Standard Test Method for Maximum Index Density and Unit Weight of Soils Using a Vibratory Table" ASTM D4253-06, West Conshohocken, Pennsylvania, USA,2006.
 ASTM. American Society of Testing and Materials, Standard Test Method for Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density" ASTM D4254-06, West Conshohocken, Pennsylvania, USA, 2006
 ASTM. American Society of Testing and Materials, Standard Test Method for Direct Shear Test of Soils under Consolidated Drained Conditions" ASTM D3080-06, West Conshohocken, Pennsylvania, USA, 2006.
 A. A. Hussein, M. A. Al-Neami and F. H. Rahil, “Evaluation of the hydrodynamic pressure effect of cylindrical liquid storage tank on the granular soil behavior under seismic excitation,” Engineering and Technology Journal, Vol. 39, Part A, No. 01, pp. 64-78, 2021.
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