Elastic modulus evolution of triaxially stressed mudstone at high temperature up to 400°C

Feng, Zichao; Zhang, Chao; Dong, Futao; Yang, Dinglong

doi:10.1002/ese3.801

Cited by 13 publications

(6 citation statements)

References 34 publications

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“…It can be noted that most research related to the effect of temperature on the shear behaviour of intact rocks were conducted on igneous rocks such as granite. While sedimentary rocks such as sandstone, limestone, and mudstone that are closely located above and below oil and gas reservoirs and coal beds 12 have received less attention. Moreover, clay-rich rocks such as mudstone are widely distributed in the earth's crust, accounting for approximately 30% of the surface rocks 13 , 14 .…”

Section: Introductionmentioning

confidence: 99%

“…These rock types have a great affinity for water due to the formation of a diffuse double layer around the negatively charged clay minerals, this makes the mechanical properties of these rocks unique and more complicated when exposed to temperature effects 15 – 17 . Some attempts were conducted to investigate the compressive and tensile behaviour of mudstone after thermal treatment 12 , 16 – 25 , and concluded that tensile and compressive properties improve to a certain temperature (400 and 600 °C) due to drying of clay minerals during thermal treatment, and then decrease after this limit. On the other hand, the effect of thermal treatment on shear behaviour of intact mudstone needs a comprehensive study and extensive efforts.…”

Section: Introductionmentioning

confidence: 99%

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Extensive experimental investigation on the effect of thermal treatment and lateral pressure on the shear behavior of intact mudstone

Alneasan

Alzo’ubi

2023

Sci Rep

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The coupling environment of temperature (T) and lateral pressure at great depths promotes intact rocks to shear failure, posing a serious threat to underground engineering. Temperature effect on shear behaviour is of particular importance due to the possible mineralogical alterations in mineral composition, especially in clay-rich rocks such as mudstone that has a great affinity for water. Accordingly, the effect of thermal treatment on the shear behaviour of intact mudstone was investigated, in this study, using the Short Core in Compression (SSC) method. Three temperatures of RT, 250 and 500 °C, and four lateral pressures of 0.0, 0.5, 2.0, and 4.0 MPa were adopted. Numerical and experimental observations showed that the resulting fractures in SCC samples are shear and by increasing the lateral pressure, shear failure is promoted. Compared with other rock types such as granite and sandstone, shear properties in mudstone have only one positive trend with temperature increase up to 500 °C, by increasing T from RT to 500 °C, mode II fracture toughness, peak friction angle, and the cohesion increased by about 15 to 47%, 4.9%, and 47.7%, respectively. The bilinear Mohr–Coulomb failure criterion can be used to model the peak shear strength behaviour of intact mudstone before and after thermal treatment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extensive experimental investigation on the effect of thermal treatment and lateral pressure on the shear behavior of intact mudstone

Alneasan

Alzo’ubi

2023

Sci Rep

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“…Mudstone typically forms the upper and lower layers in sedimentary depos its, and it is characterized by its low permeability. In projects such as geologic al deep burial disposal of nuclear waste, geo-logical storage of CO2, high temp erature to reduce viscous oil extraction, and underground gasification/pyrolysis mining of coal, mudstone can be used as a containment layer to stop the migr ation of nuclides, oil and gas leakage, and contaminants [1][2][3]. The permeabilit y of mudstone stands as a critical parameter for governing fluid transport withi n these projects.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Permeability of Mudstone Subjected to Triaxial Stresses and Its Application

Yu,

Dong,

Zhou

et al. 2023

Preprint

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To prevent the leakage of pyrolyzed oil and gas as well as the release of pollutants from the top and floor strata, it is crucial to conduct a comprehensive study on the seepage characteristics of these strata under high-temperature triaxial stress conditions. This study will help ensure the containment and integrity of subsurface reservoirs and storage environments. Mudstone, serving as both the upper and lower strata, offers an effective barrier due to its inherently low permeability. In order to explore the change rule of mudstone sealing performance under high temperature triaxial stress, an air-heated low permeability rock mass air permeability measurement system is used to measure the ground stress buried 500m deep and the temperature variation characteristics of mudstone permeability on the roof and floor of Jimsar oil shale in Xinjiang under 100℃. It was found that the permeability of stressed mudstone decreased with the temperature rising up to 100℃. The predominant factor was thermal expansion of mudstone. The drop value depended on triaxial stresses that large stresses could induce small drop value. The average hydraulic radius of pore in the mudstone was also calculated, which also exhibited continuous reduction as heating up to 100℃ and the degree of reduction could reach 68%. The capacity, that prevent oil & gas and contaminant from moving cross strata as a barrier, would be strengthened when the mudstone strata from roof and floor experienced the temperature low than 100℃. The barrier performance of mudstone as a pollutant migration barrier layer to gas pollutant migration during in-situ heat injection mining of oil shale was further evaluated.

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“…7,8 In such cases, when relatively low-temperature fluids (such as water and liquid nitrogen) make contact with high-temperature rocks, the drastic temperature changes are accompanied by the generation of thermal stress which deteriorates the mechanical properties of rock. [9][10][11][12] Consequently, it is imperative to understand the change in mechanical properties of high-temperature rock after cooling treatments. It can lay a solid theoretical foundation for increasing the production efficiency of geothermal well engineering applications or estimating the stability of the surrounding rock of tunnel postfire.…”

Section: Introductionmentioning

confidence: 99%

“…In certain circumstances, the reservoir rocks or surrounding rocks were initially in a high‐temperature environment or heated to extremely high temperatures before being subjected to rapid cooling treatment; for instance, in the process of the exploitation of HDR, cold drilling fluid is pumped into the wellbore to assist in rock breaking, and the liquid nitrogen is used in fracturing engineering, or when a conflagration occurs in the rock tunnel, and water‐based fire extinguishing agents are used to extinguish the fire 7,8 . In such cases, when relatively low‐temperature fluids (such as water and liquid nitrogen) make contact with high‐temperature rocks, the drastic temperature changes are accompanied by the generation of thermal stress which deteriorates the mechanical properties of rock 9–12 . Consequently, it is imperative to understand the change in mechanical properties of high‐temperature rock after cooling treatments.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the influence of temperature and cooling method on dynamic mechanical properties and damage of granite

Wang

Zha

et al. 2022

Energy Science & Engineering

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The change in mechanical properties of high‐temperature rock after cooling treatments is getting increasing attention. However, only a few studies have been conducted on the dynamic characteristic parameters. Therefore, this study aims to perform a dynamic damage analysis of high‐temperature rocks subjected to different thermal shocks. Accordingly, the specimens were grouped and heated to 200°C, 400°C, 600°C, and 800°C, and they were cooled by natural, water, and liquid nitrogen cooling. Ultrasonic detector tests, the split Hopkinson pressure bar experiments, and scanning electron microscope tests of the high‐temperature granite specimens were conducted using different cooling methods. Subsequently, the change rules of dynamic stress–strain curves and properties were calculated, and the morphology and micromorphology of fragments were compared. Based on the outcomes, the thermal shock damage and impact damage evolution were evaluated and quantified. The findings revealed that when the treatment temperature increases, the dynamic peak stress and elastic modulus decrease, while the peak strain increases, and the effect of rapid cooling was more significant in the influence of rock dynamic characteristics. Moreover, when the damage factor is more than 0.51, the change of dynamic stress‐strain is accelerated, leading to the instability of the structure under the impact load. The research results are expected to provide an adequate theoretical basis for the development and utilization of geothermal resources and underground engineering applications.

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Elastic modulus evolution of triaxially stressed mudstone at high temperature up to 400°C

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 13 publications

References 34 publications

Extensive experimental investigation on the effect of thermal treatment and lateral pressure on the shear behavior of intact mudstone

Extensive experimental investigation on the effect of thermal treatment and lateral pressure on the shear behavior of intact mudstone

Effect of Temperature on Permeability of Mudstone Subjected to Triaxial Stresses and Its Application

Experimental study of the influence of temperature and cooling method on dynamic mechanical properties and damage of granite

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