Predicted Performance of Braced Excavation

by Hugh Q. Golder, (M.ASCE), Partner; H. Q. Golder and Assoc., Ltd., Cooksville, Ontario, Canada,
James P. Gould, (M.ASCE), Assoc.; Mueser, Rutledge, Wentworth and Johnston, New York, NY,
T. William Lambe, (F.ASCE), Prof. of Civ. Engrg.; MIT, Cambridge, MA,
Gregory P. Tschebotarioff, (F.ASCE), Assoc.; King and Gavaris, New York, NY,
Stanley D. Wilson, (F.ASCE), Partner; Shannon and Wilson, Seattle, WA,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 3, Pg. 801-815

Document Type: Journal Paper

Abstract: This paper presents the predicted performance of a braced excavation for a subway. The predictions were made by Golder, Gould, Tschebotarioff and Wilson. The excavation was 37 ft wide and 60 ft deep, and five levels of struts were installed. The subsoil consisted of fill, silt and till. The water table was from 6 ft to 8 ft below ground surface. All four experts used semi-empirical methods to predict lateral stresses and strut loads. All, except Gould, assumed hydrostatic pore pressure distribution. The maximum predicted deflection of the sheeting ranged from 1.5 in. to 4 in. At a point on the soil surface 22-1/2 ft behind the excavation, the predicted settlement varied from 0.5 in. to 4 in., while the predicted horizontal movement was either zero or very small. All four considered the deformation of the soil to occur at constant volume.

Subject Headings: Excavation | Soil settlement | Bracing | Struts | Lateral stress | Pressure distribution | Soil deformation | Subways |

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