The Damage Constitutive Model of Sandstone under Water-Rock Coupling

Jiang, Jun; Hou, Zhengmeng; Hou, Kepeng; Lu, Yongfeng; Sun, Huafen; Niu, Xiangdong

doi:10.1155/2022/1731254

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…The mechanical properties of coal and rock are easily affected by the occurrence environment (Liu, 2009;Yao et al, 2021). In recent years, with the progress and development of society, a large number of water conservancy and hydropower projects represented by the Three Gorges have been completed and put into use (Deng et al, 2017). The reservoir bank slopes of the Three Gorges and other reservoirs are immersed in water environment for a long time, which leads to the weakening of the mechanical properties of the slope rock mass and seriously affects the stability of the reservoir bank slopes.…”

Section: Introductionmentioning

confidence: 99%

Study on deterioration effect of mechanical properties of coal and rock under water-rock interaction

Chen

Gao

2023

Preprint

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In geotechnical engineering and underground mining engineering, because coal and rock are often immersed in water, the mechanical properties of coal and rock are deteriorated to varying degrees under the action of water and rock. For this reason, water and rock interaction tests were carried out for coal and rock under six kinds of immersing times of 10days,20days,30days,40days,50days and 60days to study the deterioration effect, failure characteristics and deterioration mechanism of their compressive strength, impact characteristics and other parameters, and discuss the progressive instability and damage mechanism of multi-scale coal and rock structure under water rock interaction. The research show that:1) With the prolongation of immersion time, the water content of coal and rock samples increases in varying degrees, finally, it tends to be stable. The increase of water content of coal sample is more obvious than that of sandstone sample. 2) The compressive strength of coal and rock has deterioration effect obvious under the action of water-rock, and the deterioration effect of coal sample is more obvious than that of sandstone sample. The compressive strength of coal sample decreased from 22.55MPa to 11.15MPa, which reduced by 11.40MPa, and the compressive strength of sandstone samples decreased from 66.29MPa to 59.05MPa, which decreased by 7.24MPa, after being immersed in water for 60days. The deterioration effect of the compressive strength of coal and rock is non-uniform, with the prolongation of immersion time the deterioration effect gradually weakens. 3) With the prolongation of immersion time, the impact energy index of coal samples and sandstone samples decreases in varying degrees, and the impact tendency is gradually weakened. The impact energy index of sandstone samples dropped from 4.38 (moderate impact) to 2.65 (weak impact) after coal and rock samples were immersed in water for 60days. The coal samples dropped from 7.41 (strong impact) to 1.18 (non-impact). The impact tendency of coal samples has great impact by water-rock interaction. 4) In view of the crack distribution characteristics of coal-rock sample after failure, the failure characteristics of the samples have great influence by the time of immersion and the material of coal-rock, it is mainly in five aspects: the length of crack, the initiation location of crack, the angle between crack and specimen axis, the number of cracks, and the type of damage. 5) The deterioration effect of mechanical properties of coal under water-rock interaction the result that gradually accumulate by the internal damage of coal and rock. Under the action of water and rock, the micro damage of coal and rock samples are caused by the internal physical and chemical actions. When the damage accumulation reaches a certain degree, the samples will be damaged in the macro. 6) The multi-scale system of coal-rock structure under water-rock interaction is constructed. The water-rock interaction is analyzed from the micro-scale, meso-scale and macro-scale. The three scales are interrelated, influenced and promoted each other. In particular, this effect is more significant under high stress conditions, and the coal rock structure is deteriorated further, eventually leading to instability of system. The research results provide a reference for the prediction of mechanical properties and stability research of engineering rock mass under the environment in which both coal and rock are immersed.

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Section: Introductionmentioning

confidence: 99%

Study on deterioration effect of mechanical properties of coal and rock under water-rock interaction

Chen

Gao

2023

Preprint

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“…Deep mining operations expose rock masses to a complex geological milieu characterized by elevated temperature, pressure, osmotic forces, and disturbances 1 – 6 . A thorough understanding of the mechanical response of the rock mass in this challenging environment is gained in the support of underground engineering initiatives 7 – 11 . Nevertheless, the energy conversion mechanisms governing sandstone under the combined effects of water and dynamic loading remain largely uncharted.…”

Section: Introductionmentioning

confidence: 99%

Influence of dynamic load and water on energy accumulation and dissipation in sandstone

Yang,

Xing,

Fang

et al. 2023

Sci Rep

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In various engineering projects such as mineral extraction, hydropower resource utilization, railway construction, and geological hazard mitigation, rock engineering is often encountered. Furthermore, dynamic loads and moisture content exert notable influence on the energy transformation processes within rocks. Yet, the specific interplay of dynamic loading and water's impact on the energy conversion mechanism within the sandstone remains unexplored. To address this gap, this study conducted impact loading experiments on sandstone, elucidating the rock’s mechanical response under these conditions and unraveling the underlying energy conversion mechanisms. It was observed that the strength of sandstone exhibits a direct correlation with impact velocity. Moreover, employing energy calculation principles, we established a connection between moisture content and the sandstone’s internal energy conversion properties. The study also delved into the microscopic fracture mechanisms within the sandstone, ultimately concluding that both water content and dynamic loading have a significant impact on these microscopic fracture mechanisms.

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“…Cai et al (2021) conducted direct shear tests on phyllite under different immersion conditions and found that the cohesion was most affected by immersion conditions, the peak stress was second, and the internal friction angle was the smallest. Jiang et al (2022) established the damage constitutive model of sandstone under the water rock interaction through the experimental analysis, combined with the deduction of statistical strength theory and damage mechanics. Uniaxial compression characteristics, as one of the indispensable indexes to measure the basic physical and mechanical properties of rocks, are widely used in various engineering practices and scientific research work because of its relatively simple and clear test principles and easily realized test equipment.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the deterioration process of the dolomite with the interlayer in different directions during wetting

et al. 2022

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Taking the dolomite with anhydrite interlayer at the bottom of Huangcaoshan Tunnel in Shanghai-Wuhan-Chengdu high-speed railway as the research object, the wetting deterioration and uniaxial compression tests were performed to study the influence of different interlayer orientations on the hygroscopic deterioration characteristics of rock and to analyze the process of rock deterioration. The wetting cracking and deformation characteristics of dolomite with interlayer in different directions were analyzed respectively from the time effect of rock micro-expansion and the change of ultrasonic longitudinal wave velocity, and the uniaxial compression evolution process of samples with different moisture absorption conditions and interlayer directions was analyzed respectively from the aspects of crack volume strain and energy dissipation. The results show that the direction of interlayer had a significant effect on the wetting and deterioration of the rock. The sample with vertical interlayer cracked obviously during wetting, resulting in volume expansion along the axial and radial directions of the sample; However, the sample with horizontal interlayer had almost only axial volume expansion, and the expansion rate was small. After the rock was wet and deteriorated, the propagation velocity of ultrasonic longitudinal wave in the rock decreased, and the decrease amplitude in the sample with vertical interlayer was greater than that in the sample with horizontal interlayer. After rock wetting, its uniaxial compressive strength, crack initiation level, expansion level, and the threshold value of elastic strain energy density for failure decreased, while the radial peak strain, the energy conversion rate of dissipation increased, and the plastic characteristics of the sample were enhanced, and the sample with vertical interlayer changed significantly compared with the sample with horizontal interlayer.

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The Damage Constitutive Model of Sandstone under Water-Rock Coupling

Cited by 10 publications

References 18 publications

Study on deterioration effect of mechanical properties of coal and rock under water-rock interaction

Study on deterioration effect of mechanical properties of coal and rock under water-rock interaction

Influence of dynamic load and water on energy accumulation and dissipation in sandstone

Analysis of the deterioration process of the dolomite with the interlayer in different directions during wetting

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