Abstract
In the past, it was generally considered that the wellpoint method was suitable only for sands and not for cohesive soils. This article introduces two case histories of dock foundation pits in which the excavation work of a clayey soil slope was stabilized by the wellpoint method. The effects of the wellpoint method in clayey soil may be summarized as follows: the total stress on the whole has not been changed, the pore water pressure has been dissipated constantly, and then yields a consolidation process in which the effective stress will increase correspondingly. In this work, the method of measuring shear strength during excavation and wellpoint pumping and the stability analysis method are also introduced. A large amount of observational data of pore water pressure, settlements and internal horizontal displacements and the vane shear strength indicated that the effect of wellpoint method is prominent, if the coefficient of permeability of a clayey soil is not less than 1 × 10−6 cm/sec.
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