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Young's Modulus of Soil

Youngs Modulus

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Young's Modulus of Soil

The modulus of elasticity or Young's modulus of a soil is an elastic soil parameter most commonly used in the estimation of settlement from static loads.

Young's soil modulus, Es, may be estimated from empirical correlations, laboratory test results on undisturbed specimens and results of field tests. Laboratory tests that may be used to estimate the soil modulus are the triaxial unconsolidated undrained compression or the triaxial consolidated undrained compression tests. Field tests include the plate load test, cone penetration test, standard penetration test (SPT) and the pressuremeter test. Empirical correlations summarized from USACE EM 1110-1-1904 is presented below:

Es = KcCu
where: Es = Young's soil modulus (tsf)
Kc = correlation factor
Cu = undrained shear strength, tsf

Typical Elastic Moduli of soils based on soil type and consistency/ density, (from USACE, Settlement Analysis).

 Soil Es (tsf) very soft clay 5 - 50 soft clay 50 - 200 medium clay 200 - 500 stiff clay, silty clay 500 - 1000 sandy clay 250 - 2000 clay shale 1000 - 2000 loose sand 100 - 250 dense sand 250 - 1000 dense sand and gravel 1000 - 2000 silty sand 250 - 2000

Other soil and soil related properties are listed below:

Angle of Internal Friction
Bearing Capacity Factors
Cohesion
External Friction Angle
Factor of Safety
Lateral Earth Pressure Coefficients
Soil Unit Weights

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