Excavation in Hard Clays of the Keuper Formation

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by Erwin Gartung, LGA, Nuremberg, West Ger, LGA, Nuremberg, West Ger,

Document Type: Proceeding Paper

Part of: Geotechnical Aspects of Stiff and Hard Clays

Abstract: For the construction of a lock on the Main-Danube-Canal in South Germany a 30 m deep cut had to be excavated in the overconsolidated clays and claystones of the Keuper formation. The strength of this material depends on the degree of weathering, on the stress level and on the duration of loading. For the design of a tied back pile wall, soil strength parameters were selected on the basis of laboratory tests and engineering judgement. Measurements of anchor-forces and wall movements showed the time dependent increase of earth pressure on the wall. The measured performance of the tied back wall supplements the conventional stability analyses in the assessment of the degree of safety.

Subject Headings: Excavation | Clays | Soil pressure | Soil analysis | Pile tests | Retaining structures | Soil stabilization | Strength of materials | Germany | Europe

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