Sensitivity of sandstone strength and deformability to changes in moisture content

Hawkins, A. B.; McConnell, Brian

doi:10.1144/gsl.qjeg.1992.025.02.05

Cited by 371 publications

(188 citation statements)

References 13 publications

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“…Strength reduction for water saturated samples with respect to dry ones is reported in Baud et al 2000 due to a decrease in fracture energy and slight drop of friction coefficient. This strength reduction is not identical for all rock types and may depend on the rock mineralogy and especially the clay content, as reported in Hawkins and Mcconnell (1992) and Morales Demarco et al (2007) for sandstones. Finally, water may have an active weathering role by dissolving bonds between grains within the material (Ciantia et al 2014).…”

Section: Relation Between Creep and Fatiguementioning

confidence: 66%

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Cerfontaine¹,

Collin²

2017

Rock Mech Rock Eng

276

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Section: Relation Between Creep and Fatiguementioning

confidence: 66%

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Cerfontaine¹,

Collin²

2017

Rock Mech Rock Eng

276

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“…Many researchers have studied the effect of moisture content on the engineering properties of rock [21][22][23][24][25]. Moisture content is one of the most important factors influencing rock strength [26].…”

Section: Effects Of Aggregate Moisture Content On the Mechanical Strementioning

confidence: 99%

“…Granite aggregate moisture can weaken the adhesion strength of inside material, and reduce the uniaxial compressive strength of the aggregate. The relationship between water content and uniaxial compressive strength [18] [23] [24] could be described by an exponential equation. …”

Section: Effects Of Aggregate Moisture Content On the Mechanical Strementioning

confidence: 99%

Influence of Aggregate Moisture Content on the Mechanical Properties of Resin Mineral Composite

Yin¹,

Zhang²,

Zhang³

et al. 2015

Proceedings of the International Conference on Chemical, Material and Food Engineering

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INTRODUCTIONMachine tool bed plays an important role in the manufacturing industry, which could provide mechanical products of better precision and surface quality. However, vibration generated in the machining process has much more influence on the dimensional precision and surface quality of the workpiece, which prohibits high-speed and high-precision machining from developing rapidly. How to minimize vibration during the manufacturing process is now an important factor that affects machining precision and the stability of machine tool [1] [2].Resin mineral composite (RMC) is a composite material similar to plain concrete that it is composed of granite particles as solid aggregate. The difference is that the binder is organic resin. With the development of high-speed and high-precision machining technology, RMC has attracted more and more attention for its good vibration alleviating properties [3]. Compared with gray cast iron and welded steel, RMC has ten times the damping ratio that it can better absorb vibrations generated in the machining process, especially in high-speed and high-precision machining processes [2] [4]. However, the application of RMC is restricted by its limitation in mechanical strength, and considerable research should be done to improve its mechanical properties in order to satisfy the requirements of high-speed and high-precision machining.The mechanical strength of fully cured RMC is highly related to its components and the interface between the resin matrix and filler [5] on the mechanical strength of RMC. However, little information has been focused on the influences of aggregate moisture content on the mechanical strength of RMC. As the key component in RMC to bear loads, the aggregate weight of the total composite material accounts for more than 85%, the physical and chemical properties of the aggregate has a significant impact on the mechanical properties of RMC [5]. Influence of aggregate moisture content on the mechanical strength of RMC was not received sufficient attention. Fontana and Reams [14] revealed that 3% of pre-existing water in aggregates reduces the compressive strength of the PC by half. Header and Mohammad [15] found that the polymer concrete's flexural strength decreased from 25.8 MPato 0.68 MPa and compressive strength from 190MPa to 85 MPa when the initial moisture added to the aggregate content increased from 0% to 5%. However, data is still scarce. We need to provide more documents. In this International Conference on Chemical, Material and Food Engineering (CMFE-2015)

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“…Obvious reductions in uniaxial compressive strength (UCS) [5] and Young's modulus have been shown with the introduction of water to sandstone [6], clay [7], mudrock [2] and coal [8]. The degradation of mechanical properties is a function of the water content, where exponential or power relations are usually shown [3,9].…”

Section: Introductionmentioning

confidence: 99%

Influence of Water Saturation on the Mechanical Behaviour of Low-Permeability Reservoir Rocks

et al. 2017

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Abstract:The influence of water on the mechanical properties of rocks has been observed by many researchers in rock engineering and laboratory tests, especially for sedimentary rocks. In order to investigate the effect of water saturation on the mechanical properties of low-permeability rocks, uniaxial compression tests were conducted on siltstone with different water contents. The effects of water on the strength, elastic moduli, crack initiation and damage thresholds were observed for different water saturation levels. It was found that 10% water saturation level caused more than half of the reductions in mechanical properties. A new approach is proposed to analyze the stress-strain relations at different stages of compression by dividing the axial and lateral stress-strain curves into five equal stress zones, where stress zones 1-5 refer to 0%-20%, 20%-40%, 40%-60%, 60%-80% and 80%-100% of the peak stress, respectively. Stress zone 2 represents the elastic range better than stress zone 3 which is at half of the peak stress. The normalized crack initiation and crack damage stress thresholds obtained from the stress-strain curves and acoustic emission activities averaged 31.5% and 83% of the peak strength respectively. Pore pressure is inferred to take part in the deformation of low-permeability siltstone samples, especially at full saturation levels. A change of failure pattern from multi-fracturing to single shear failure with the increase of water saturation level was also observed.

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Sensitivity of sandstone strength and deformability to changes in moisture content

Cited by 371 publications

References 13 publications

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Influence of Aggregate Moisture Content on the Mechanical Properties of Resin Mineral Composite

Influence of Water Saturation on the Mechanical Behaviour of Low-Permeability Reservoir Rocks

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