Tie-Backs in Clay to Support Sheeted Excavation

by Charles I. Mansur, (F.ASCE), Vice Pres.; McClelland Engrs., Inc., St. Louis, MO,
M. Alizadeh, (M.ASCE), Asst. Branch Mgr.; McClelland Engineers, Inc., St. Louis, MO,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 2, Pg. 495-509

Document Type: Journal Paper


Site conditions, design, construction procedures, and observations and stress measurements made during construction of a cofferdam for a 30-ft to 45-ft deep excavation for the Pierre Laclede building in Clayton, Missouri, are described. The cofferdam consisted of soldier posts, wood lagging, and 1, 2, and 3 levels of tie-backs anchored in clay soils. The soldier posts and tie-back anchor rods were instrumented with mechanical and electrical strain gages. Stress, deflection, and settlement measurements made during excavation and after completion of the excavation are presented.

Subject Headings: Construction sites | Excavation | Clays | Building design | Cofferdams | Soil settlement | Soil analysis | Soil stress | Missouri | United States

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