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Diapir Mudstone Properties, Leiria, Portugal
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Orientador(es)
Resumo(s)
The engineering geology study of the Dagorda Formation outcropping in the core of the Parceiros-Leiria diapir, was based on field reconnaissance, on in situ and laboratory tests. The formation is constituted mainly by clay and silt, sometimes with sand, occasionally with gypsum or marls. The engineering geology properties of the fine materials showed large variability depending on their degree of consolidation and water content, ranging from very poor to fair. The presence of soluble minerals can develop dissolution voids. When exposed, for example in excavation surfaces, they tend to deteriorate because of decompression and exposure to the external environment, easily losing strength when wet, which facilitates the failure on slopes or foundations. The presence of soluble minerals (gypsum and rock salt at greater depth) can develop dissolution voids due to circulating water. In depth the variation of the mechanical properties may lead to difficulties in foundation ground, as well as difficulty of concreting piles, due to the escape of concrete between neighboring piles along fissures and dissolution voids. The occurrence of very low strength seams, may constrain the stability of cuttings. The unusual geotechnical behavior of these terrains due to the presence of both clay and soluble minerals must be taken into account. In all engineering works to be carried out on these materials it is recommended to develop a detailed engineering geology study prior to construction, in order to early identify the problems and to define the suitable solutions and construction techniques to be adapted to each case. The construction works must have geotechnical assistance in order to improve the construction operations.
Descrição
Conference code 153949
15th International Multidisciplinary Scientific Geoconference and EXPO, SGEM 2015, Albena, Bulgaria, 18 June 2015 - 24 June 2015.
15th International Multidisciplinary Scientific Geoconference and EXPO, SGEM 2015, Albena, Bulgaria, 18 June 2015 - 24 June 2015.
Palavras-chave
Diapir Geotechnical properties Mudstone Portugal
Contexto Educativo
Citação
Veiga, Anabela & Quinta-Ferreira, Mário. (2015). Diapir mudstone properties, Leiria, Portugal. 10.5593/SGEM2015/B12/S2.033.
Editora
International Multidisciplinary Scientific Geoconference
Licença CC
Sem licença CC