Experimental investigation on the blocking of groundwater seepage from a waterproof curtain during pumped dewatering in an excavation

Xu, Ye-Shuang; Yan, Xue-Xin; Shen, Shui-Long; Zhou, An-Nan

Experimental investigation on the blocking of groundwater seepage from a waterproof curtain during pumped dewatering in an excavation | Investigation expérimentale sur le blocage de l’infiltration d’eaux souterraines à travers un rideau étanche pendant le dénoyage d’une excavation Investigación experimental sobre el bloqueo de las filtraciones de agua subterránea en una pantalla impermeable durante el drenaje por bombeo en una excavación 止水帷幕对地下水渗流阻挡效应的基坑降水试验研究遮水カーテンから掘削における揚水引きおきた地下水浸透の阻止に関する実験的研究 Investigação experimental sobre o bloqueio de infiltração de água subterrânea a partir de uma cortina impermeável durante a drenagem por bombeamento em uma escavação

2019

Xu, Ye-Shuang | Yan, Xue-Xin | Shen, Shui-Long | Zhou, An-Nan

The interaction between a waterproof curtain and withdrawal wells (or simply, the wall-well effect) is a key factor in controlling the environmental effects that occur during the dewatering of foundation pits. A series of laboratory investigations was conducted to study the changes in groundwater level during dewatering. The influence of the buried depth of the waterproof curtain placed in a dewatering confined aquifer (D), and the filter length of the pumping well (L), is investigated. Based on the laboratory test results, numerical simulations are used to analyse the ground settlement. The relationship between the approximate hydraulic gradients on both sides of the wall (Δi), or the ground settlement outside the excavation (S), using ratio RD (D divided by the thickness of the confined aquifer) or ratio RL (L divided by the thickness of the confined aquifer), can be simulated using a Boltzmann curve. The value of Δi increases while S decreases with an increase in RD, whereas Δi decreases while S increases with an increase in RL. The value of the contraflexure point of the Boltzmann curve is regarded as the effective value of RD or RL. Based on a comprehensive consideration, RD is suggested to be equal to or larger than the effective value, and RL is suggested to be equal to or lesser than the effective value.

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