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In this paper, based on monitoring data from 18 deep excavation cases in soft soil area in Shanghai, the depth of basal heave (H R ), the width of settlement zone (B s ), the maximum ground settlement (δ vm ) and lateral deflection of retaining wall (δ hm ) are studied. First, it is found that H R is the depth where the unloading ratio is 0.15. Second, B s is found to be closely related to the volume of excavation and the depth of basal heave. Then two simple methods are proposed for the prediction of B s . At last, the relation between maximum deformation and construction time is studied. And the objective construction time is suggested.

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