Static Cone to Compute Static Settlement over Sand

by John H. Schmertmann, (M.ASCE), Prof. of Civ. Engrg.; Univ. of Florida, Gainesville, FL,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 3, Pg. 1011-1043

Document Type: Journal Paper


At least two methods for using static cone data to predict settlement exist and have received extensive use—those of Terzaghi-Peck-Meyerhof and Buisman-DeBeer. Another method is presented in this paper. All three methods are then applied to 16 test cases involving either actual foundations, or plate load tests, with measured settlements. The proposed method simplifies calculations without sacrificing conservatism, yet appears most accurate over the full scope of the available test cases. These involve foundation widths of 2 ft to 184 ft. The key feature of the new method is that a single distribution of a strain influence factor is assumed for all cases. This method eliminates the need to compute the intermediate parameter of change in vertical stress with depth below a shallow footing. Also presented is a new correlation between static cone-bearing capacity and sand compressibility. Compressibility was measured in-situ by a special screw-plate form of plate-bearing load test. New data are included for the correlation between the static cone-bearing capacity and SPT blow count values in sands.

Subject Headings: Load tests | Statics (mechanics) | Soil settlement | Conical bodies | Foundation settlement | Plates | Load factors | Vertical loads

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