Application of direct and indirect methods for predicting geotechnical dam foundation issues on weathered metamorphic rocks under tropical conditions

Title:

Application of direct and indirect methods for predicting geotechnical dam foundation issues on weathered metamorphic rocks under tropical conditions

Creator:

Leao, Marcio Fernandes and Marques, Eduardo Antonio Gomes

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:f44ac2d2-95d8-4c5b-a126-0033e7b86a5d
uuid:f44ac2d2-95d8-4c5b-a126-0033e7b86a5d
doi:10.13168/AGG.2020.0002

Subject:

Karst cavities, electrical resistivity, concrete-gravity dam, and weathering rocks

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Weathering profiles in tropical regions usually present great heterogeneity and anisotropy of geological materials. High structural complexity and great bedrock irregularity are added when these profiles are composed of metamorphic rocks. Therefore, geological-geotechnical research initiatives in these regions imply indirect methods associated with direct methods. In this context, we studied the San Juan dam foundation in the Dominican Republic, geologically composed of young residual schist soil cover (up to 20 m), in which occurs schist layers of low resistance to SPT (2 SPT blows/30 cm) consistent with a massive and stratified marble rock, which tends to concentrate karst cavities. This geological condition, associated with the vast extent of the dam influence area, motivated the adoption of an indirect method by electrical resistivity intending to identify sites with the possibility of occurrence of cavities filled or not under the reservoir foundation and in the dam axis itself. Subsequently, a more rational initiative of mixed drillings was carried out in sites with such possibility, resulting in discarding these hypotheses and demonstrating that these cavities correspond to graphite schists and non-karst marbles, competent materials as dam foundation.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Coverage:

31-37

Source:

Acta geodynamica et geomaterialia : | 2020 Volume:17 | Number:1 (197)

Harvested from:

CDK

Metadata only:

false