Study on the relation between damage and permeability of sandstone at depth under cyclic loading

Zhao, Yang; Zhou, Hongwei; Zhong, J.C.; Liu, Di

doi:10.1007/s40789-019-00278-z

Cited by 41 publications

(22 citation statements)

References 31 publications

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“…Mining activities and accidents are mechanics-oriented problems (Galvin 2016;Kaiser 2019;Peng 2019;Qian and Xu 2019;Zhao et al 2019;Zuo et al 2019) that can be attributed to the stress redistribution in the overburden (Brady and Brown 2013;Galvin 2016;Song et al 2020). The evolution of the mining-induced stress field is closely related to the distribution of mining-induced fracture field and macroscopic breaking characteristics of the strata .…”

Section: Introductionmentioning

confidence: 99%

Characteristics of evolution of mining-induced stress field in the longwall panel: insights from physical modeling

Lou

Fu-qiang

Yang

et al. 2021

Int J Coal Sci Technol

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The evolution of mining-induced stress field in longwall panel is closely related to the fracture field and the breaking characteristics of strata. Few laboratory experiments have been conducted to investigate the stress field. This study investigated its evolution by constructing a large-scale physical model according to the in situ conditions of the longwall panel. Theoretical analysis was used to reveal the mechanism of stress distribution in the overburden. The modelling results showed that: (1) The major principal stress field is arch-shaped, and the strata overlying both the solid zones and gob constitute a series of coordinated load-bearing structures. The stress increasing zone is like a macro stress arch. High stress is especially concentrated on both shoulders of the arch-shaped structure. The stress concentration of the solid zone in front of the gob is higher than the rear solid zone. (2) The characteristics of the vertical stress field in different regions are significantly different. Stress decreases in the zone above the gob and increases in solid zones on both sides of it. The mechanical analysis show that for a given stratum, the trajectories of principal stress are arch-shaped or inversely-arched, referred to as the “principal stress arch”, irrespective of its initial breaking or periodic breaking, and determines the fracture morphology. That is, the trajectories of tensile principal stress are inversely arched before the first breaking of the strata, and cause the breaking lines to resemble an inverted funnel. In case of periodic breaking, the breaking line forms an obtuse angle with the advancing direction of the panel. Good agreement was obtained between the results of physical modeling and the theoretical analysis.

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Section: Introductionmentioning

confidence: 99%

Characteristics of evolution of mining-induced stress field in the longwall panel: insights from physical modeling

Lou

Fu-qiang

Yang

et al. 2021

Int J Coal Sci Technol

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“…The number and severity of mine disasters such as roof fall, floor heave, coal-gas outburst, and rockburst severely grow as the mining depth increases (Li et al 2017Lian et al 2020;Lu et al 2019;Wang et al 2019;Wu et al 2020;Xue et al 2020;Zuo et al 2019Zuo et al , 2020aZhao et al 2018). To reveal the mechanisms of such disasters, many investigations were conducted to test the mechanical behavior of individual rock samples (Dou et al 2020;Guo et al 2019;Yuan et al 2018;Zhao et al 2019;Wang et al 2020;Shen et al 2020) or coal samples (Kim et al 2020;Nikolenko et al 2020). In fact, these disasters are commonly caused by the failure of the entire coal-rock composite body (Zuo et al 2013;Zhao et al 2015;Wang et al 2017, b).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression

Chen

Zuo

Liu

et al. 2021

Int J Coal Sci Technol

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To accurately predict coal burst hazards and estimate the failure of coal pillars in underground coal mining systems, it is of great significance to understand the mechanical behavior of coal-rock bimaterial composite structures. This paper presents experimental and numerical investigations on the response of rock-coal, coal-rock, and rock-coal-rock bimaterial composite structures under triaxial compression. The triaxial compression experiments are conducted under confining pressures in the range of 0–20 MPa. The resulting inside fracture networks are detected using X-ray-based computed tomography (CT). The experimentally observed data indicate that the mechanical parameters of the rock-coal-rock composites are superior to those of the rock-coal and coal-rock combinations. After compression failure, the coal-rock combination specimens are analyzed via X-ray CT. The results display that the failure of the coal-rock composite bodies primarily takes place within the coal. Further, the bursting proneness is reduced by increasing confining pressure. Subsequently, the corresponding numerical simulations of the experiments are carried out by using the particle flow code. The numerical results reveal that coal is vulnerable with regard to energy storage and accumulation.

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“…Based on the study of the permeability evolution law of the damage of coal and rock mass, Zou et al [19] obtained the relationship between damage characteristics and permeability of granite through the compression test. Zhao et al [20] used acoustic emission (AE) to obtain the damage and permeability evolution characteristics of rock under stress. Wang et al [21] conducted cyclic loading and unloading tests on deep coal and rock masses under confining pressure obtained the permeability of coal and rock mass and established its relationship with various mechanical properties of coal and rock mass.…”

Section: Introductionmentioning

confidence: 99%

Study on Permeability of Deep‐Buried Sandstone under Triaxial Cyclic Loads

Sheng

Mabi

2021

Advances in Civil Engineering

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The triaxial cyclic loading and unloading test was carried out on a TAW-2000 rock mechanics to study the permeability characteristics of deep-buried sandstone. This paper analyzed the evolution laws of permeability, elastic modulus, rock damage, dissipated energy, and acoustic emission events of sandstone under different confining pressures. It also introduced the concept of relative strain and further discussed the relationship between relative strain and permeability. The test results showed that the permeability of sandstone under cyclic loading and unloading obviously experienced three stages. At a low strain level, the damage degree of sandstone was low. As a result, both the number of acoustic emission events and the proportion of the dissipated energy density were small. In this stage, with increasing the stress, the permeability decreased. With the increase of the relative strain, the propagation of fissure increased through rock interior and the damage of rock was accumulated. Consequently, the number of acoustic emission events grew slowly, and the proportion of dissipated energy density and the damage variable (D) increased gradually. In this stage, the permeability increases. As the axial strain reached the peak strain, the fissures developed into cracks and the rock failure happened. The number of acoustic emission events increased rapidly; both the proportion of the dissipated energy density and the damage variable (D) obtain the maximum value. In this stage, the permeability increased greatly. In this study, the point of fissure propagation of rock specimens was used as the point of demarcation. Before the fissures propagated, the permeability increased slowly and it was in accordance with a linear function. After the fissures propagated, the degree of rock damage increased, and the permeability increased in the form of an exponential function. The larger the confining pressure was, the smaller the relative strain corresponding to the point of fissure propagation was.

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Study on the relation between damage and permeability of sandstone at depth under cyclic loading

Cited by 41 publications

References 31 publications

Characteristics of evolution of mining-induced stress field in the longwall panel: insights from physical modeling

Characteristics of evolution of mining-induced stress field in the longwall panel: insights from physical modeling

Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression

Study on Permeability of Deep‐Buried Sandstone under Triaxial Cyclic Loads

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