Deformation behavior and damage-induced permeability evolution of sandy mudstone under triaxial stress

Yang, Licong; Zhang, Tong; Ma, Yankun; Song, Shuai-Bing; Tang, Ming; Li, Yanfang

doi:10.1007/s11069-022-05366-z

Cited by 5 publications

(2 citation statements)

References 44 publications

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“…The hydromechanical tests were carried out using a triaxial servo-controlled perm ation experimental apparatus. The apparatus, comprising six parts, a servo loading s tem, a triaxial cell, a pressure control system, a liquid/gas testing system, a data collect system, and an auxiliary system, can supply an axial and confining stress applied to samples with a stable temperature during the measurement of permeability in this wo The experimental apparatus is shown in Figure 2, and the equipment parameters w described in detail by a previous study [29].…”

Section: Experimental Apparatusmentioning

confidence: 99%

Experimental Study on Deformation Behavior and Permeability Evolution of Sandstone Responding to Mining Stress

Yang

Zhang

et al. 2022

Energies

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Mining-induced hydromechanical behavior of sandstone is critical to mining safety and disaster prevention. To investigate the evolution behavior of the mechanical and permeability properties of sandstone, mining-induced stress was imitated by increasing axial stress and decreasing confining stress, and a set of hydromechanical experiments were further performed, incorporating the effect of in situ stress, pore pressure, and mining stress. The results show the similar variation tendencies of the deformation and permeability of sandstone under different loading paths of in situ stress and pore pressure. Most sandstone samples maintain a compression state for the peak stress condition. The failure mode evolved from shear failure to shear–tension failure with the increase in in situ stress. The stress-relief effect significantly effects the permeability, since the permeability of sandstone increases exponentially with decreasing effective confining stress. The growth rate of permeability in Stage II is significantly greater than that in Stage I. One order of magnitude of permeability was presented at the peak stress situation. A fitting exponential model based on the alteration of effective confining stress was proposed to describe the permeability evolution dominated by the stress-relief effect, and the discovered permeability model can accurately describe the experimental results. The research results provide significant guidance for understanding the hydromechanical behavior and water hazard prevention for underground coal mines.

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Section: Experimental Apparatusmentioning

confidence: 99%

Experimental Study on Deformation Behavior and Permeability Evolution of Sandstone Responding to Mining Stress

Yang

Zhang

et al. 2022

Energies

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“…At room temperature, the triaxial compression experiments showed that the permeability of limestone decreases monotonically with increased axial stress, yet the permeability in sandstone first decreases and then increases (Alam et al 2014;Selvadurai and Głowacki 2017). The sandy mudstone has klinkenberg effect at the low confining pressure of 5 MPa, and the permeability decreases with increasing pore pressure (Liu et al 2022). For limestone treated after high temperature cooling, the porosity increases with increasing temperature (Zhang et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Real-time permeability evolution of limestone under high temperature and triaxial stresses

Chen

Feng

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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In deep underground geological disposal of nuclear waste, geothermal energy development, underground coal gasification, geothermal resources development and other underground high temperature projects, they are all closely related to the permeability and thermal expansion characteristics of rocks in high temperature high-pressure real-time state. In this experiment, the real-time evolution of permeability of limestone under high-temperature and triaxial stresses condition was studied using the HTHP rock mechanics triaxial test system and compared with the permeability of limestone after high temperature cooling treatment. The test results show that: the effect of temperature on limestone permeability facilitation under high temperature cooling condition is significant, and the permeability increases by 1–2 orders of magnitude relative to the initial permeability for every 100 °C increase in the preheat temperature after 300 °C. Under high-temperature and high-pressure in real time condition, the difference values of permeability at different temperature points relative to room temperature always do not more than one order of magnitude. During the heating process at 500 °C, the permeability curves of the triaxial pressures range from 15 to 35 MPa are very different. Under the pressure condition of 15 MPa, the permeability curve increases monotonically and rapidly with the increasing temperature; When the pressure reaches 25 MPa pressure, there is a peak value area in the permeability curve; the permeability decreases monotonically with temperature when the pressure up to 35 MPa. Compared with the only thermal effect, the thermal- mechanical coupling effect has a significant inhibitory effect on limestone permeability development, and the permeability disparity between the two types of heat treatment rocks become more and more significant with increasing temperature and hydrostatic pressure.

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Experimental study on water saturation effect on coal sample permeability under different effective stresses

et al. 2023

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During the drainage and production of coalbed methane (CBM) wells, the Constant changes in stress and water saturation of reservoir restricts the dynamic change of the reservoir permeability. By carrying out stress sensitivity experiments with different water saturations in coal, the correlation between permeability and the coupling of effective stress and water saturation was analyzed. The water saturation sensitivity and stress sensitivity of reservoir were evaluated by the stress sensitivity index (S), permeability damage rate (PDR), and stress sensitivity coefficient (αk), and the change law of coal permeability under different stresses with different water saturations was revealed. The results showed that the coal reservoir permeability decreased with increasing stress following a negative exponential function and decreased nearly linearly with increasing water saturation. In addition, the coal water saturation sensitivity was positively correlated with effective stress, and the coal stress sensitivity was positively correlated with water saturation. Finally, a mathematical model for predicting coal permeability that considered the impacts of water saturation and effective stress was established, revealing the controlled mechanism affecting the permeability change.

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Deformation behavior and damage-induced permeability evolution of sandy mudstone under triaxial stress

Cited by 5 publications

References 44 publications

Experimental Study on Deformation Behavior and Permeability Evolution of Sandstone Responding to Mining Stress

Experimental Study on Deformation Behavior and Permeability Evolution of Sandstone Responding to Mining Stress

Real-time permeability evolution of limestone under high temperature and triaxial stresses

Experimental study on water saturation effect on coal sample permeability under different effective stresses

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