被圧地下水圧の変動と地盤沈下に関する水理実験(II)

Abstract

The subsidence of ground due to pumping up the ground-water isassumed to occur by the accumulation of a partial residual of the compressive strainin artesian aquifers during each cycles of pumping. This paper is described con-cerning a hydraulic experimental research for this problem, using a large scalemodel of artesian sand aquifers consisting of two layers.The following experiments have been performed by this model:1) Determination of aquifer constants by means of separate drawdown tests fromeach aquifer.2) Measuring the variation of water pressure and the settlement of layers duringthe drawdown test from both aquifers.3) Measuring the variation of water pressure and the rebound of layers duringthe recharge test into both aquifers.4) Measuring the behaviour of each layer during the repetition of drawdown.The effect of recharging water into the ground to decrease the subsidence isalso treated in this paper.