Design and Performance Verification of a Soil-Bentonite slurry Wall for the Hydraulic Isolation of Contaminated Sites

摘要

The polluted ground of contamianted sites is often encapsualted by diaphragm walls, with concrete or concrete-stabilized earth being common construction materials in Eu-rope. At the Institute of Geotechnical Engineering at the Swiss Federal Institute of Technology Zurich, new material mixtures that contain a high percentage of clay minerals have been developed over the past few years. Two experimental diaphragm walls, one in Switzerland and one in Germany, were constructed using such materials. A diaphragm wall 55 m deep uisng this mixture is currently being placed to encapsulate a contaminated landfill site in Germany. In this paper, an evaluation of the new mixture and results from both the experimental and full-scale walls, as well as complementary laboratory investigations, are presented and examined.