Publication

Self-Sealing of Localised Cracks in Boom and Opalinus Clay Hollow Cylinders

Laurent Gastaldo, Vincent Labiouse, Jean-François Mathier
2012
Conference Papers

Abstract

The SELFRAC project aimed to study the fractures within the Excavation Damaged Zone (EDZ) around galleries in the Boom clay and Opalinus clay formations and their possible sealing/healing with time. Tests carried out at LMR-EPFL aimed at quantifying on the same sample the increase in permeability induced by a localised crack, and subsequently the potential self-sealing process of this localised crack. The tests were performed in triaxial cells on hollow cylindrical samples and consisted in radial permeability measurements before and after the tensile fracturing of the clayey samples. In both clays, sealing processes are observed. However, the reduction in hydraulic conductivity after fracturing is much slower in Opalinus clay than the one in Boom clay (extremely fast recovering of the virgin clay permeability).

Official source

https://infoscience.epfl.ch/entities/publication/fb14e84b-713e-48a7-a762-257a0314a42f

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Laurent Gastaldo, Vincent Labiouse, Jean-François Mathier
2012
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/fb14e84b-713e-48a7-a762-257a0314a42f

About this result

Related concepts (13)

Fracture

Fracture is the separation of an object or material into two or more pieces under the action of stress. The fracture of a solid usually occurs due to the development of certain displacement discontinuity surfaces within the solid. If a displacement develops perpendicular to the surface, it is called a normal tensile crack or simply a crack; if a displacement develops tangentially, it is called a shear crack, slip band or dislocation. Brittle fractures occur without any apparent deformation before fracture.

Fracking

Fracking (also known as hydraulic fracturing, fracing, hydrofracturing, or hydrofracking) is a well stimulation technique involving the fracturing of bedrock formations by a pressurized liquid. The process involves the high-pressure injection of "fracking fluid" (primarily water, containing sand or other proppants suspended with the aid of thickening agents) into a wellbore to create cracks in the deep-rock formations through which natural gas, petroleum, and brine will flow more freely.

Tensile testing

Tensile testing, also known as tension testing, is a fundamental materials science and engineering test in which a sample is subjected to a controlled tension until failure. Properties that are directly measured via a tensile test are ultimate tensile strength, breaking strength, maximum elongation and reduction in area. From these measurements the following properties can also be determined: Young's modulus, Poisson's ratio, yield strength, and strain-hardening characteristics.

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