Influence of Anisotropic Microcracking Due to Swelling on the Fracture Toughness of a Clay-Bearing Sandstone

Tiennot, Mathilde; Mertz, Jean‐Didier; Bourgès, Ann

doi:10.1007/s00603-017-1273-4

Cited by 12 publications

(17 citation statements)

References 22 publications

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“…A clay‐bearing sandstone from the Thüringen Basin in Germany is investigated. The variation of rock's physical properties due to water vapor sorption under environmental exposure conditions has been studied previously (Tiennot et al, ). Even though velocity measurements reveal that the rock is transversally isotropic due to natural orientation of clay, the largest difference of compressional velocities in different directions is less than 3%; thus, the rock will be considered homogeneous and isotropic in this research (Tiennot et al, ).…”

Section: Sample Descriptionmentioning

confidence: 99%

Fluid Substitution and Shear Weakening in Clay‐Bearing Sandstone at Seismic Frequencies

et al. 2019

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Using the forced oscillation method and the ultrasonic transmission method, we measure the elastic moduli of a clay‐bearing Thüringen sandstone under dry and water‐saturated conditions in a broad frequency band at [0.004–10, 106] Hz for different differential pressures up to 30 MPa. Under water‐saturated condition, clear dispersion and attenuation for Young's modulus, Poisson's ratio, and Bulk modulus are observed at seismic frequencies, except for shear modulus. The measured dispersion and attenuation are mainly attributed to the drained/undrained transition, which considers the experimentally undrained boundary condition. Gassmann's predictions are consistent with the measured undrained bulk moduli but not with the shear moduli. Clear shear weakening is observed, and this water‐softening effect is stronger at seismic frequencies than at ultrasonic frequencies where stiffening effect related to squirt flow may mask real shear weakening. The reduction in surface free energy due to chemical interaction between pore fluid and rock frame, which is not taken into account by Gassmann's theory, is the main reason for the departure from Gassmann's predictions, especially for this rock containing a large number of clay minerals.

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Section: Sample Descriptionmentioning

confidence: 99%

Fluid Substitution and Shear Weakening in Clay‐Bearing Sandstone at Seismic Frequencies

et al. 2019

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“…8). A macroscopic reversibility of the swelling behaviour over cycles has already been described in Tiennot (2017). An anisotropic swelling behaviour is identified for these two sedimentary stones, as perpendicular is higher at each RH level than parallel .…”

Section: Swelling Behaviourmentioning

confidence: 59%

“…To evaluate the influence of RH variations on the mechanical and fracture behaviour, fracture toughness is also measured under various exposure conditions (presented in the section below). Samples adapted for cultural heritage studies have been proposed thanks to the previous investigations (Tiennot and Bourgès 2016;Tiennot 2017). Semicircular Bending (SCB) samples are used for this research.…”

Section: Mechanical Behaviourmentioning

confidence: 99%

“…The notch is not sharpened to study the minerals in which the initiation occurs, because it seems more representative of the natural conditions (Tiennot 2017).…”

Section: Mechanical Behaviourmentioning

confidence: 99%

“…Some researches on modulus loss are also carried out to specifically understand the decay of cultural heritage stones (Felix 1977;Scherer and Jiménez González 2005;Wangler and Scherer 2008). Young moduli measurements are then integrated on stress induced by swelling calculus (Scherer and Jiménez González 2005;Tiennot 2017).…”

Section: Introductionmentioning

confidence: 99%

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Influence of Clay Minerals Nature on the Hydromechanical and Fracture Behaviour of Stones

2019

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Elastic properties and fracture behaviour evolutions of two sedimentary stones are under study to estimate their influence on scaling effect of monumental stone heritage. Young moduli and toughness of Villarlod molasse and Thüringer sandstone are measured under moisture content variations with respect to their natural anisotropy. Several relative humidity levels are considered to investigate their effect upon humidification and drying. The stone property evolution is in close correlation with the identified clay phases of the matrix. It appears that clay minerals as smectite and glauconite influence the stone properties at very low moisture contents, whereas less swelling clays have impact only when high moisture contents are reached. This is in close correlation with the inherent deformation ability of these minerals. It is observed that nature and distribution of clay phases largely influence on the macroscopic behaviour under natural exposure conditions, as they modify the stone properties and represent the weakness planes of the stone.

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The Influence of Bedding Planes on Tensile Fracture Propagation in Shale and Tight Sandstone

et al. 2022

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Influence of Anisotropic Microcracking Due to Swelling on the Fracture Toughness of a Clay-Bearing Sandstone

Cited by 12 publications

References 22 publications

Fluid Substitution and Shear Weakening in Clay‐Bearing Sandstone at Seismic Frequencies

Fluid Substitution and Shear Weakening in Clay‐Bearing Sandstone at Seismic Frequencies

Influence of Clay Minerals Nature on the Hydromechanical and Fracture Behaviour of Stones

The Influence of Bedding Planes on Tensile Fracture Propagation in Shale and Tight Sandstone

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