Experimental study of the risks associated with soft clay excavations Abstract Precise prediction of the risk of cave-ins of soft-clay excavations requires a knowledge of several variables which are difficult to evaluate. Prediction is further complicated by the fact that the risk of cave-ins increases over time, due to the slow and complex redistribution of stresses in the clay following excavation.A previous study (RS-84-18) created and characterized an experimental trench 8 metres deep at Saint-Hilaire. Parameters for the verification of a model of the stability of clay soils were derived from the results of that study. Using the results of this study, it was possible to estimate the talus slope, shoring, and work practices compatible with safe execution of excavation work.The results communicated to workers and their employers will help them plan excavation work more reliably, follow safe work practices, and eliminate the risk of cave-ins. Produced Under this Project Scientific Publications Short-term behaviour of test excavation in the Champlain clayLafleur J., Silvestri V., Asselin R., Soulié M.Source : Canadian Geotechnical Journal, vol. 25, no 4, 1988, p. 705-715 Additional Information Type: Project Number: 0086-0200 Status: Completed Research Field: Mechanical and Physical Risk Prevention Team: Jean Lafleur (Polytechnique Montréal)