Abstract
The design and assessment of pier foundations are crucial due to the substantial loads they must
support. Piers are subjected to significant structural and dynamic loads, requiring a robust
foundation system to ensure stability and prevent excessive settlement or failure. A mat foundation is
typically selected to distribute these heavy loads over a large area, minimizing pressure on the
underlying soil. The bearing capacity is assumed to be based on the presence of a rocky strata, which
provides the necessary strength to withstand high load intensities at the foundation base. The depth of
the foundation must be carefully determined, accounting for water penetration through the topsoil
and the influence of the groundwater table, especially when it is located above the footing. This
necessitates a deep foundation to mitigate the risk of soil weakening and ensure long-term stability. In
areas where the topsoil is moist and the underlying soil is in a saturated condition, the soil’s bearing
capacity is considerably reduced. To prevent excessive settlement or foundation failure, it becomes
essential to extend the foundation deeper, reaching stable, less permeable soil or rock layers that can
support the structure’s load more effectively. Additionally, environmental factors, such as fluctuating
groundwater levels, moisture penetration, and seasonal changes between wet and dry conditions can
adversely affect the foundation’s performance over time. Saturated soils pose significant challenges
by increasing the likelihood of differential settlement, which can compromise the structural integrity
of the pier. Therefore, this paper presents a comprehensive assessment of foundation design for piers,
focusing on critical geotechnical factors, the effects of soil moisture and saturation, and strategies to
ensure long-term durability and safety of the structure under various environmental conditions. This
assessment serves as a guide for designing pier foundations in challenging soil environments where
heavy loads and water-related factors are significant considerations.

Keywords: Pier foundation design, soil saturation effects, deep foundations, groundwater influence, structural stability

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1. Bowles JE. Foundation Analysis and Design. 5th ed. New York: McGraw-Hill; 1996. p. 1175.
2. Das BM. Principles of Foundation Engineering. 7th ed. Stamford: Cengage Learning; 2010. p. 912.
3. Coduto DP. Foundation Design: Principles and Practices. 2nd ed. Upper Saddle River, NJ: Prentice Hall; 2001. p. 888.
4. Terzaghi K, Peck RB, Mesri G. Soil Mechanics in Engineering Practice. 3rd ed. New York: Wiley; 1996. p. 592.
5. Poulos HG, Davis EH. Pile Foundation Analysis and Design. New York: Wiley; 1980. p. 410.
6. Budhu M. Soil Mechanics and Foundations. 3rd ed. Hoboken, NJ: John Wiley & Sons; 2011. p. 780.
7. Broms BB. Lateral resistance of piles in cohesive soils. J Soil Mech Found Div ASCE. 1964;90(2):27–63.
8. Rowe PW. The stress-dilatancy relation for static equilibrium of an assembly of particles. Proc R Soc Lond A Math Phys Sci. 1962;269(1339):500–527.
9. Murthy VNS. Geotechnical Engineering: Principles and Practices of Soil Mechanics and Foundation Engineering. New York: CRC Press; 2002. p. 1064.
10. Prakash S. Soil Dynamics. New York: McGraw-Hill; 1981. p. 432.
11. Meyerhof GG. The ultimate bearing capacity of foundations. Geotechnique. 1951;2(4):301–331.
12. Federal Highway Administration (FHWA). Drilled shafts: construction procedures and design methods. Washington, DC: U.S. Department of Transportation, Federal Highway Administration; 2006. Report No.: FHWA-NHI-10-016.
13. Terzaghi K. Theoretical Soil Mechanics. New York: John Wiley & Sons; 1943. p. 528.
14. Cernica JN. Geotechnical Engineering: Foundation Design. New York: John Wiley & Sons; 1994. p. 455.
15. Tang AM, Cui YJ, Ghoreychi M. Effects of cyclic wetting and drying on the hydro-mechanical behaviour of compacted clayey soils. Appl Clay Sci. 2008;39(1-2):221–232.

Abstract
The design and assessment of pier foundations are crucial due to the substantial loads they must
support. Piers are subjected to significant structural and dynamic loads, requiring a robust
foundation system to ensure stability and prevent excessive settlement or failure. A mat foundation is
typically selected to distribute these heavy loads over a large area, minimizing pressure on the
underlying soil. The bearing capacity is assumed to be based on the presence of a rocky strata, which
provides the necessary strength to withstand high load intensities at the foundation base. The depth of
the foundation must be carefully determined, accounting for water penetration through the topsoil
and the influence of the groundwater table, especially when it is located above the footing. This
necessitates a deep foundation to mitigate the risk of soil weakening and ensure long-term stability. In
areas where the topsoil is moist and the underlying soil is in a saturated condition, the soil’s bearing
capacity is considerably reduced. To prevent excessive settlement or foundation failure, it becomes
essential to extend the foundation deeper, reaching stable, less permeable soil or rock layers that can
support the structure’s load more effectively. Additionally, environmental factors, such as fluctuating
groundwater levels, moisture penetration, and seasonal changes between wet and dry conditions can
adversely affect the foundation’s performance over time. Saturated soils pose significant challenges
by increasing the likelihood of differential settlement, which can compromise the structural integrity
of the pier. Therefore, this paper presents a comprehensive assessment of foundation design for piers,
focusing on critical geotechnical factors, the effects of soil moisture and saturation, and strategies to
ensure long-term durability and safety of the structure under various environmental conditions. This
assessment serves as a guide for designing pier foundations in challenging soil environments where
heavy loads and water-related factors are significant considerations.

Keywords: Pier foundation design, soil saturation effects, deep foundations, groundwater influence, structural stability

🔒 This is a subscription article

Full text is available to subscribers and institutional members. Please choose an option below to access it.

1. Bowles JE. Foundation Analysis and Design. 5th ed. New York: McGraw-Hill; 1996. p. 1175.
2. Das BM. Principles of Foundation Engineering. 7th ed. Stamford: Cengage Learning; 2010. p. 912.
3. Coduto DP. Foundation Design: Principles and Practices. 2nd ed. Upper Saddle River, NJ: Prentice Hall; 2001. p. 888.
4. Terzaghi K, Peck RB, Mesri G. Soil Mechanics in Engineering Practice. 3rd ed. New York: Wiley; 1996. p. 592.
5. Poulos HG, Davis EH. Pile Foundation Analysis and Design. New York: Wiley; 1980. p. 410.
6. Budhu M. Soil Mechanics and Foundations. 3rd ed. Hoboken, NJ: John Wiley & Sons; 2011. p. 780.
7. Broms BB. Lateral resistance of piles in cohesive soils. J Soil Mech Found Div ASCE. 1964;90(2):27–63.
8. Rowe PW. The stress-dilatancy relation for static equilibrium of an assembly of particles. Proc R Soc Lond A Math Phys Sci. 1962;269(1339):500–527.
9. Murthy VNS. Geotechnical Engineering: Principles and Practices of Soil Mechanics and Foundation Engineering. New York: CRC Press; 2002. p. 1064.
10. Prakash S. Soil Dynamics. New York: McGraw-Hill; 1981. p. 432.
11. Meyerhof GG. The ultimate bearing capacity of foundations. Geotechnique. 1951;2(4):301–331.
12. Federal Highway Administration (FHWA). Drilled shafts: construction procedures and design methods. Washington, DC: U.S. Department of Transportation, Federal Highway Administration; 2006. Report No.: FHWA-NHI-10-016.
13. Terzaghi K. Theoretical Soil Mechanics. New York: John Wiley & Sons; 1943. p. 528.
14. Cernica JN. Geotechnical Engineering: Foundation Design. New York: John Wiley & Sons; 1994. p. 455.
15. Tang AM, Cui YJ, Ghoreychi M. Effects of cyclic wetting and drying on the hydro-mechanical behaviour of compacted clayey soils. Appl Clay Sci. 2008;39(1-2):221–232.