Effect of Water Saturation on the Fracture and Mechanical Properties of Sedimentary Rocks

Roy, Debanjan Guha; Singh, T. N.; Kodikara, Jayantha; Das, Ratan

doi:10.1007/s00603-017-1253-8

Cited by 115 publications

(31 citation statements)

References 49 publications

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“…An effect equivalent to the decrease of the compressive strength with an increased moisture content of sandstones was observed also for the Young's modulus [9,16]. A decrease in the Young's modulus of water-saturated sandstones ranging between ca 20% and 50% against the dry state is reported by most authors [17][18][19].…”

Section: Introductionmentioning

confidence: 68%

“…The moisture content of sandstones also significantly reduces the fracture toughness, as was already demonstrated by Singh and Sun [20]. Although it is obvious that the rate of decrease in the fracture toughness due to moisture generally depends on the mineralogy and the grain size of sandstone, as well as the used testing method and specimen geometry [20], many authors stated an approximately 20% to 50% reduction in the fracture toughness related to the water saturation [17,[21][22][23][24]. Additionally, the data about the dropping in the fracture toughness to approximately one-half to one-third of its value for dry sandstone can also be found in literature [20,25,26].…”

Section: Introductionmentioning

confidence: 75%

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In-situ X-ray Differential Micro-tomography for Investigation of Water-weakening in Quasi-brittle Materials Subjected to Four-point Bending

et al. 2020

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Several methods, including X-ray radiography, have been developed for the investigation of the characteristics of water-saturated quasi-brittle materials. Here, the water content is one of the most important factors influencing their strength and fracture properties, in particular, as regards to porous building materials. However, the research concentrated on the three-dimensional fracture propagation characteristics is still significantly limited due to the problems encountered with the instrumentation requirements and the size effect. In this paper, we study the influence of the water content in a natural quasi-brittle material on its mechanical characteristics and fracture development during in-situ four-point bending by employing high-resolution X-ray differential micro-tomography. The cylindrical samples with a chevron notch were loaded using an in-house designed four-point bending loading device with the vertical orientation of the sample. The in-house designed modular micro-CT scanner was used for the visualisation of the specimen’s behaviour during the loading experiments. Several tomographic scans were performed throughout the force-displacement diagrams of the samples. The reconstructed 3D images were processed using an in-house developed differential tomography and digital volume correlation algorithms. The apparent reduction in the ultimate strength was observed due to the moisture content. The crack growth process in the water-saturated specimens was identified to be different in comparison with the dry specimens.

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 75%

In-situ X-ray Differential Micro-tomography for Investigation of Water-weakening in Quasi-brittle Materials Subjected to Four-point Bending

et al. 2020

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“…(2016), Guha Roy et al . (2017), and Zhou et al . (2018, 2019) concluded that fracture toughness of sandstone progressively decreases with increases of water content.…”

Section: Geologic Geomorphic and Climatic Contextmentioning

confidence: 96%

Surficial fractures in the Navajo sandstone, south‐western USA: the roles of thermal cycles, rainstorms, granular disintegration, and iterative cracking

Loope

Burberry

et al. 2020

Earth Surf Processes Landf

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Deep (> 5 m) sheeting fractures in the Navajo sandstone are evident at numerous sites in southern Utah and derive from tectonic stresses. Strong diurnal thermal cycles are, however, the likely triggers for shallow (< 0.3 m) sheeting fractures. Data from subsurface thermal sensors reveal that large temperature differences between sensors at 2 and 15 cm depth on clear summer afternoons are as great as those that trigger sheeting fractures in exposed California granite. Extensive polygonal patterns in the Navajo sandstone are composed of surface-perpendicular fractures and were produced by contractile stresses. Numerous studies have shown that porewater diminishes the tensile strength of sandstone. Based on our thermal records, we propose that cooling during monsoonal rainstorms triggers polygonal fracturing of temporarily weakened rock. On steep outcrops, polygonal patterns are rectilinear and orthogonal, with T-vertices. Lower-angle slopes host hexagonal patterns (defined by the dominance of Y-vertices). Intermediate patterns with rectangles and hexagons of similar scale are common. We posit that outcropping fractures are 1 digitalcommons.unl.edu

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“…Unlike all other toughness testing methods up to date, this procedure allows for close contact between the material at the crack tip and the fracturing fluid during the whole test. Thus, the method can be used to test and understand diffusive phenomena, which may lead to toughness reductions via Stress Corrosion Cracking (SCC) [42][43][44]. The procedure has been applied to accurately identify the effect of different active agents in the fracking fluid upon fracture toughness of carbonatic shale rocks from the Vaca Muerta oil & gas reservoirs [45].…”

Section: Introductionmentioning

confidence: 99%

Improved technique for toughness testing of shale rocks

Fuentealba

Otegui

Bianchi

2020

Engineering Fracture Mechanics

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Effect of Water Saturation on the Fracture and Mechanical Properties of Sedimentary Rocks

Cited by 115 publications

References 49 publications

In-situ X-ray Differential Micro-tomography for Investigation of Water-weakening in Quasi-brittle Materials Subjected to Four-point Bending

In-situ X-ray Differential Micro-tomography for Investigation of Water-weakening in Quasi-brittle Materials Subjected to Four-point Bending

Surficial fractures in the Navajo sandstone, south‐western USA: the roles of thermal cycles, rainstorms, granular disintegration, and iterative cracking

Improved technique for toughness testing of shale rocks

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