抄録
This paper describes not only the application of Forchheimer's formula, which is a discharge equation for flat, open-bottom impermeable casing wells, to the estimation for the discharge of dewatered excavation as a large circular well but also the practical utility of a proposed method for estimating the radius of influence which was derived from Forchheimer's formula. The investigation was conducted by comparing the observed results of an actual dewatered excavation with the calculated results. Also, the study was made of the application of the existing methods for estimating the radius of influence in the dewatered excavation as a large circular well with open-bottom impermeable casing. The results of the investigation are as follows : (1) The calculated results of discharge by Forchheimer's formula are in good agreement with the observed results ; the error between these two results is under 14 per cent. (2) The calculated results of the radius of influence by the proposed equation with sR = 0.2m agree approximately with the observed results ; the error between these two results is under 20 per cent. (3) The calculated results of the radius of influence by the existing methods are quite different from the observed results.
