Study on ground upheaval caused by the rise in groundwater level by centrifuge tests and by numerical simulations

Abstract

Recently, regional ground upheaval phenomenon caused by the rise in groundwater level has been observed in an urban area, and its effect on underground structures is concerned. In this study, at first the observed ground upheaval distribution in Tokyo city was reported. Secondly, in order to clarify the mechanism of ground upheaval with the rise in groundwater level and to establish the prediction method, the centrifuge model tests and numerical simulations using the one dimensional consolidation theory proposed by Mikasa were conducted. The centrifuge model test showed that the isochrone of pore water pressure become the non-linear distribution at the steady state after dewatering process, and the ground upheaval phenomenon with the rise in groundwater level was clearly observed. In numerical simulations, the effect of permeability coefficient of non-linear isochrone of pore water pressure was discussed. Analytical results showed the same tendency as the test results in the analytical case with porosity-dependent permeabilities. The results showed that the validity of the prediction method and the importance of determinating the permeability coefficient of clay in the ground upheaval analysis.

Experimental study on influence of ground rebound on tunnels caused by groundwater restoration

“…The authors (Sreng et al, 2009, Kusaka et al, 2011, Kusaka, 2012, Sreng et al, 2014 have presented some related studies on the ground rebound mechanism using centrifuge model tests and their numerical analysis.…”