Impacts of Pore-Throat System on Fractal Characterization of Tight Sandstones

Liu, Dengke; Gu, Zhaolin; Liang, Ruixiang; Su, Jun-Wei; Ren, Dazhong; Bin, Chen; Huang, Chuanqing; Yang, Chao

doi:10.1155/2020/4941501

Cited by 76 publications

(70 citation statements)

References 39 publications

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“…However, for the granite, it is a kind of medium-low grain rock, microcracks exist at the mineral interfaces, water is easily penetrated into rock matrix compared to marble, and a lot of ice lens forms. As proved by other studies that the mesoscopic structural characteristics of rock control its macroscopic mechanical responses [33,[36][37][38][39][40][41], this work further proves this finding. The basic reason causing the difference of frost heaving force evolution is the mesoscopic structures.…”

Section: Maximum Frost Heaving Force Predictionsupporting

confidence: 85%

Experimental Evaluation of Multiple Frost Heaving Parameters for Preflawed Granite in Beizhan Iron Mining, Xinjiang, China

et al. 2021

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Ice-driven mechanical weathering in cold regions is considered a main factor impacting the stability of rock mass. In this work, the response surface method (RSM) was employed to evaluate and optimize the multiple frost heaving parameters to seek the maximum frost heaving force (FHF), in combination with experimental modeling based on a specially designed frost heaving force measurement system. Three kinds of rocks were prepared with parallel flaws in it having different flaw width, length, and cementation type, and these factors were used to fit an optimal response of the maximum FHF. The experimental results reveal five distinguished stages from the frost heaving force curve, and they are inoculation stage, explosive stage, decline to steady stage, recovery stage, and sudden drop stage. The sensitivity analysis reveals the influential order of the considered factors to peak FHF, which is the rock lithology, flaw width, flaw cement type, and flaw length. For low-porosity hard rock, increasing flaw width, flaw length, and flaw cement strength can improve the probability of frost heaving failure. It is suggested that rock lithology determines the water migration ability and influences the water-ice phase transformation a lot.

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Section: Maximum Frost Heaving Force Predictionsupporting

confidence: 85%

Experimental Evaluation of Multiple Frost Heaving Parameters for Preflawed Granite in Beizhan Iron Mining, Xinjiang, China

et al. 2021

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“…Figure 11 shows that under identical lithology and axial stress conditions, when the Talbol power index increases, the increment of fractal dimension of the sandstone sample after compression increases, and the crushed rock particles are larger. The reason is that the larger Talbol power index corresponds to a larger proportion of large grain rock in 9 Geofluids the crushed rock sample. It is difficult for large grained rocks to roll and slide, so they are more easily crushed during compression.…”

Section: Long-term Bearing Deformation and Fractal Characteristics Ofmentioning

confidence: 99%

“…After coal mining, many mined-out spaces are formed underground, which causes strata movement, damage, surface subsidence, and collapse [1][2][3][4][5]. Simultaneously, a large quantity of solid wastes such as gangue is discharged in the coal mining process [6][7][8][9][10]. Gangue discharge and surface subsidence control are common problems in coal mining.…”

Section: Introductionmentioning

confidence: 99%

Effects of Water Immersion on the Long-Term Bearing Characteristics of Crushed Gangue in Goaf

Ning

Yin

et al. 2021

Geofluids

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To study the long-term bearing characteristics of crushed gangue in goaf under water immersion conditions, the creep test of the crushed gangue in the water immersion state was performed by using the self-developed large-scale deformation-seepage test system of crushed rock. The effects of the rock lithology, axial stress, and grain composition on the long-term bearing deformation characteristics and fractal characteristics of crushed gangue under water immersion were analysed. The results show that under certain conditions of axial stress and grain composition of the gangue, a greater uniaxial compressive strength of water-saturated rock corresponds to a greater deformation resistance of the rock, smaller strain and crushing expansion in the corresponding creep stage, and greater fractal dimension increments of the crushed gangue after compression, and the gangue will have more serious crushing. With identical grain compositions and with the increase in the axial stress in the creep stage, the strain increases, the crushing expansion decreases, the fractal dimension increments of the crushed gangue after compression increase, and the gangue will have more serious crushing. Under identical axial stress conditions, when the Talbol power index n is 0.5, the differentials of the strain and crushing expansion for the crushed sandstone sample in the creep stage are minimal. When n is 0.3 or 0.7, these quantities are basically equal. With the increase in the Talbol power index, the fractal dimension increments of the crushed sandstone sample during compression gradually increase, and the crushed sandstone sample will have more serious crushing.

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“…Under different geological processes, the rock masses contain various discontinuities such as joints, fissures, cracks, and faults [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Crack Initiation Behaviors of Granite Specimens Containing Crossing‐Double‐Flaws with Different Lengths under Uniaxial Loading

Pan

Yin

Ning

et al. 2020

Advances in Civil Engineering

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Crack initiation is an important stage in the failure process of rock masses. In this paper, crack initiation behaviors (crack initiation model, crack initiation location, crack initiation angle, and crack initiation stress) of granite specimens containing crossing-double-flaws with different lengths were investigated using PFC2D software. Crack initiation models were all tensile wing cracks, which did not exactly initiate from the main flaw with a length of 30 mm. They can initiate from the secondary flaw with a length 20 mm at α of 30° (included angle between main flaw and horizontal direction) and β of 90° (included angle between main and secondary flaws) and from main and secondary flaws at α of 30° and β of 60°. These were mainly induced by the superposition of stress fields around the main and secondary flaws as β varied from 0° to 90°, especially the tensile force concentration zones superposition. The tensile forces concentration zone around flaw shrank towards flaw tips with the increase of flaw’s inclinations measured horizontally. Under stress field superposition effects, the crack initiation stress decreased firstly and then increased with β at α of 30° and 45°. Crack initiation locations were close to flaw tips but not restricted to them. The distances between crack initiation locations and flaw tips, and the crack initiation angles depended on the flaw where first macrocracks initiated from. Microdisplacement field distributions of granite specimens to reveal the mesomechanism of crack initiation behaviors were discussed.

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Impacts of Pore-Throat System on Fractal Characterization of Tight Sandstones

Cited by 76 publications

References 39 publications

Experimental Evaluation of Multiple Frost Heaving Parameters for Preflawed Granite in Beizhan Iron Mining, Xinjiang, China

Experimental Evaluation of Multiple Frost Heaving Parameters for Preflawed Granite in Beizhan Iron Mining, Xinjiang, China

Effects of Water Immersion on the Long-Term Bearing Characteristics of Crushed Gangue in Goaf

Crack Initiation Behaviors of Granite Specimens Containing Crossing‐Double‐Flaws with Different Lengths under Uniaxial Loading

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