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Analysis of Embedded Retaining Wall Using the Subgrade Reaction Method

Abstract

This paper analyzes the distribution of internal forces and displacements of embedded retaining wall in Quaternary deposits and Tertiary clays. Calculations have been based on the Subgrade Reaction Method (SRM) for two different types of earth pressure behind the wall (active, at-rest) in order to show the differences resulting from adopting the limit values. An algorithm for calculation of “cantilever wall” using the Mathematica program was proposed.

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A comparative study of soil-structure interaction in the case of frame structures with raft foundation

References [1] Terzaghi, K. (1955): Evaluation of coefficients of subgrade reaction. Geotechnique , 5, 297–326. [2] Vesić, A. (1961): Beams on elastic subgrade and the Winkler’s hypothesis. Proceedings of 5th International Conference on Soil Mechanics and Foundation Engineering , Vol. 1, pp. 845–850. [3] Timoshenko, S., Goodier, J.N. (1970): Theory of Elasticity , 3rd edition. McGraw and Hill, New York. [4] Bowles, J.E. (2001): Foundation Analysis and Design . McGraw-Hill, New Jersey. [5] Larkela, A., Mengelt, M., Stapelfeldt, T

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An Optimized Elasto-Plastic Subgrade Reaction For Modeling The Response Of A Nonlinear Foundation For A Structural Analysis

Abstract

Geotechnical and structural engineers are faced with a difficult task when their designs interact with each other. For complex projects, this is more the norm than the exception. In order to help bridge that gap, a method for modeling the behavior of a foundation using a simple elasto-plastic subgrade reaction was developed. The method uses an optimization technique to position 4-6 springs along a pile foundation to produce similar load deflection characteristics that were modeled by more sophisticated geotechnical finite element software. The methodology uses an Excel spreadsheet for accepting user input and delivering an optimized subgrade spring stiffness, yield, and position along the pile. In this way, the behavior developed from the geotechnical software can be transferred to the structural analysis software. The optimization is achieved through the solver add-in within Excel. Additionally, a beam on a nonlinear elastic foundation model is used to compute deflections of the optimized subgrade reaction configuration.

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Engineering Properties of Bentonite Stabilized with Lime and Phosphogypsum

Abstract

Engineering properties such as compaction, unconfined compressive strength, consistency limits, percentage swell, free swell index, the California bearing ratio and the consolidation of bentonite stabilized with lime and phosphogypsum are presented in this paper. The content of the lime and phosphogypsum varied from 0 to 10 %. The results reveal that the dry unit weight and optimum moisture content of bentonite + 8 % lime increased with the addition of 8 % phosphogypsum. The percentage of swell increased and the free swell index decreased with the addition of 8 % phosphogypsum to the bentonite + 8 % lime mix. The unconfined compressive strength of the bentonite + 8 % lime increased with the addition of 8 % phosphogypsum as well as an increase in the curing period up to 14 days. The liquid limit and plastic limit of the bentonite + 8 % lime increased, whereas the plasticity index remained constant with the addition of 8 % phosphogypsum. The California bearing ratio, modulus of subgrade reaction, and secant modulus increased for the bentonite stabilized with lime and phosphogypsum. The coefficient of the consolidation of the bentonite increased with the addition of 8 % lime and no change with the addition of 8 % phosphogypsum.

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In Situ Lateral Load Tests on Instrumented Bored Piles in Loessial Soils

References [1] Reese, C. and Van Impe, W. (2001). Single Piles and Pile Groups Under Lateral Loading. London: Taylor and Francis Group. [2] Hetenyi, M. (1946). Beams on elastic foundations. Ann Arbor: University of Michigan Press. [3] Terzaghi, K. (1955). Evaluations of coefficients of subgrade reaction. Geotechnique, 5 (4), pp. 297-326. [4] Broms, B. (1964). Lateral resistance of piles in cohesive soils. Journal of Soil Mechanics and Foundation Engineering, ASCE, 90(2), pp. 27

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Compaction and Liquefaction of a Sandy Layer: Simulation of Shaking Table Experiments

shaking table, Tectonophysics, 304, 4, 369-383. 4. PRASAD S. K., TOWHATA I., CHANDRADHARA G. P. & NANJUNDASWAMY (2004): Shaking table tests in earthquake geotechnical engineering, Current Science, 87, 10, 1398-1404. 5. SEED H. B., MARTIN G. R. & PYKE R. M. (1978): Effect of multidirectional shaking of pore pressure development in sands, Journal of the Geotechnical Engineering Division, ASCE, 104, 1, 27-44. 6. TOWHATA I., VARGAS-MONGE W., ORENSE R. P. & YAO M. (1999): Shaking table tests on subgrade reaction of pipe

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Evaluation of Pile’s Buckling Under Axial Load by B-Spline Method and Comparison With Finite Element Method and Exact Solution

-bearing piles in a non-homogeneous elastic foundation. International journal for numerical and analytical methods in geomechanics , 21 (12), pp.845-861. Shariyat, M. and Asemi, K., 2014. 3D B-spline finite element nonlinear elasticity buckling analysis of rectangular FGM plates under non-uniform edge loads, using a micromechanical model. Composite Structures , 112 , pp.397-408. Terzaghi, K., 1955. Evalution of conefficients of subgrade reaction. Geotechnique , 5(4), pp.297-326.

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Performance Analysis of Flexible Pavement with Reinforced Ash

Association, 2014. [10] Elsa Eka Purti, N.S.V. Kamesvara Roa, M.A. Mannan, “Evaluation of Modulus of Elasticity and Modulus of Subgrade Reaction of Soils Using CBR Test”, Journal of Civil Engineering Research 2 (1): 34-40, 2012. [11] Fabio Santos, Lin Li, Yadong Li, Farshad Amini, “Geotechnical Properties of Fly Ash and Soil Mixtures for Use in Highway Embankments” in Proc. of the World of Coal Ash (WOCA) Conference, Denver, USA: 125-136,2011. [12] IRC 37: 2001: Guildelines for the Design of Flexible Pavement

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Effect of Eccentricity in Sandy Slope of Laterally Loaded Single Pile

.: Laterally Loaded Piles: Models and Measurements. Department of Hydraulic Engineering, TU Delft, 2010. [5] ASHFORD, S. A. - JUIRNARONGRIT, T.: Evaluation of Pile Diameter Effect on Initial Modulus of Subgrade Reaction. J. Geotech. Geoenvironmental Eng., Vol. 129, No. 3, 2003, pp. 234–242. [6] M. R. - FLEMING, K. E. K. - WELTMAN, A.: Piling Engineering, 3rd ed., Taylor and Francis Group, 1992. [7] ZHANG, L. - SILVA, F. - GRISMALA, R.: Ultimate Lateral Resistance to Piles in Cohesionless Soils. October, J. Geotech. Geoenvironmental Eng., Vol. 131, January

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Load – Displacement Behaviour of a Pile on a Sloping Ground for Various L/D Ratios

40098-012-0022-6.2012. Sivapriya, S. V - Gandhi, S. R. (2013) Experimental and numerical behaviour of single pile subjected to lateral load . Indian Geotechnical Journal , Vol. 43, No.1, p .105-114. Terashi, M. - Kitazume, M. - Manuyama, A. - Yamamoto, Y. (1991) Lateral resistance of a long pile in or near the slope . Proceedings of Centrifuge ‘91. H.-Y. Ko. and F. Mclean, eds., Balkema, Rotterdam, The Netherlands, p . 245-252. Terzaghi, K (1955) Evaluation of coefficients of subgrade reaction . Geotechnique, Vol. 5, No.4, p .297–326.

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