Settlement of Residual Soils

by Ray E. Martin, Schnabel Engineering Associates, Richmond, VA, USA,

Document Type: Proceeding Paper

Part of: Foundations and Excavations in Decomposed Rock of the Piedmont Province


The method previously suggested by the author in 1977 for calculating settlement of non-plastic to slightly plastic Piedmont Physiographic Region residual soils is reviewed. Additional pressuremeter data is included from throughout the Piedmont for development of a revised correlation between pressuremeter modulus and Standard Penetration Test N value. The rheological factor alpha relating the soil modulus of deformation to the pressuremeter modulus is re-evaluated based on new case histories and a value of 1 is again recommended. Thus, settlements may be calculated using the pressuremeter modulus as an approximation of the soil modulus of deformation when good quality pressurement modulus profiles are available for a specific site. A correction factor to be applied to the general settlement equation when rock occurs within the depth of influence of the foundation is presented.

Subject Headings: Soil settlement | Measuring instruments | Soil deformation | Residual soils | Foundation settlement | Soil modulus | Soil pressure | Plastics

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