Ground Movements Caused by Braced Excavations

by Thomas D. O'Rourke, (A.M.ASCE), Asst. Prof.; School of Civ. and Environmental Engrg., Cornell Univ., Ithaca, N.Y. 14853,

Serial Information: Journal of the Geotechnical Engineering Division, 1981, Vol. 107, Issue 9, Pg. 1159-1178

Document Type: Journal Paper


The causes and patterns of ground movement associated with braced excavations are examined. Field measurements of displacements for braced cuts in sand and soft to medium clay show a relationship between the deflection of the excavation wall and the ratio of horizontal to vertical movement adjoining the cut. A review of various case histories indicates that soil displacement depends strongly on the construction process. Practices are recommended for promoting a stiff bracing system, excavating beneath the lowest braces, and using berms to restrain ground movement.

Subject Headings: Displacement (mechanics) | Ground motion | Bracing | Excavation | Soft soils | Case studies | Sandy soils | Clays

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