Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
On the Required Thickness of Grout Curtains under Dams
To reduce the water leakage and the uplift pore pressure in the rock foundation, grout curtains are oftenconstructed under dams. However, the design of grout curtains has long been based on empirical knowledge.When designing the grout curtain, focus was mainly given on closing the curtain and limiting the leakage,without considering the thickness of the curtain. However, a too thin grout curtain could lead to high gradients,which with time could result in internal erosion of degraded grout and fracture infilling materials. This couldlead to poor performance and durability problems, potentially jeopardizing the dam safety and increasingthe cost for remedial measures. In this paper, three design criteria are discussed for determining the requiredthickness of the grout curtain, including water loss reduction, uplift pore pressure reduction and internalerosion of degraded grout and fracture infilling materials. Analyses on the required thickness are made fora typical concrete gravity dam. The results show that the required thickness is significantly affected by theinternal erosion of fracture infilling materials. These results show the need for a more refined design approachfor the grout curtains based on the suggested criteria. ; QC 20210527
On the Required Thickness of Grout Curtains under Dams
To reduce the water leakage and the uplift pore pressure in the rock foundation, grout curtains are oftenconstructed under dams. However, the design of grout curtains has long been based on empirical knowledge.When designing the grout curtain, focus was mainly given on closing the curtain and limiting the leakage,without considering the thickness of the curtain. However, a too thin grout curtain could lead to high gradients,which with time could result in internal erosion of degraded grout and fracture infilling materials. This couldlead to poor performance and durability problems, potentially jeopardizing the dam safety and increasingthe cost for remedial measures. In this paper, three design criteria are discussed for determining the requiredthickness of the grout curtain, including water loss reduction, uplift pore pressure reduction and internalerosion of degraded grout and fracture infilling materials. Analyses on the required thickness are made fora typical concrete gravity dam. The results show that the required thickness is significantly affected by theinternal erosion of fracture infilling materials. These results show the need for a more refined design approachfor the grout curtains based on the suggested criteria. ; QC 20210527
On the Required Thickness of Grout Curtains under Dams
Zhang, Suihan (Autor:in) / Johansson, Fredrik (Autor:in)
01.01.2021
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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