Effect of fissure water on mechanical characteristics of rock mass

Zhang, Haibo; Zhang, Wei; Lv, Lei; Feng, Yan

doi:10.1016/s1674-5264(09)60293-3

Cited by 12 publications

(14 citation statements)

References 3 publications

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“…In the existing research on the influence of the secant modulus and rock size, most consider the aspect ratio effect [14] and changes in fracture size [10], where the main discussion is on the effect of an increase in the aspect ratio or a change in the fracture size on the secant modulus. However, these papers rarely establish the relationship between the secant modulus and rock size, and they rarely consider the effect of roughness changes on the size effect of the secant modulus.…”

Section: Discussionmentioning

confidence: 99%

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Simulation Study on the Size Effect of Secant Modulus of Rocks Containing Rough Joints

Sun

Hu³

et al. 2022

Sustainability

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The secant modulus reflects the ability of rocks to resist deformation, and it is mostly used to evaluate rock strength and deformation evolution. Due to the existence of rough joints in rocks, the secant modulus changes according to rock size. Therefore, it is very important to effectively obtain the secant modulus to evaluate rough-jointed rock deformation. In this paper, the regression analysis method is used, and 25 sets of simulation models are set up to discuss the influence of joint roughness and rock size on the rock secant modulus. The research shows that the secant modulus increases exponentially with the increase in rock size, and it increases as a power function with the increase in joint roughness. The characteristic size of the secant modulus increases exponentially with the increase in joint roughness, also as a power function. This paper gives the specific forms of these four relationships. The establishment of these relationships enables the prediction and calculation of the secant modulus and provides guidance for rock deformation analysis.

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Section: Discussionmentioning

confidence: 99%

“…Yin et al [9] determined that the reduction degree of the secant modulus is related to crack angle and length. Zhang et al [10] obtained the variation law of the secant modulus with fracture size by studying the deformation of fractured rock. Joints also affect the secant modulus.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study on the Size Effect of Secant Modulus of Rocks Containing Rough Joints

Sun

Hu³

et al. 2022

Sustainability

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“…Wang et al [23] analyzed the connection between media dynamic parameters and initial gas pressure under cyclic shock. Zhang et al [24] used cement mortar to simulate rock specimens with different angles of cracks and used an SHPB device to carry out dynamic and static loading tests, respectively. Tian et al [25] performed uniaxial compression tests using an SHPB on 3D-printed rocks with prefabricated cracks of different inclinations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Fracture Characteristics and Crack Propagation Mechanism of Fractured Sandstone under Dynamic Loading

Ping,

2024

Applied Sciences

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In order to study the impact of fracture thickness on the dynamic mechanical properties of rock specimens, impact compression tests on prefabricated sandstone specimens with different fracture thicknesses and intact specimens were carried out by using a split Hopkinson pressure bar (SHPB) test device, and the dynamic mechanical parameters of the fractured sandstone specimens were obtained. The results showed that the dynamic stress–strain curves of the prefabricated fractured sandstone specimens are similar to those of the intact sandstone specimens, which can be divided into three stages: elasticity, plasticity, and failure. With the increase in the thickness of prefabricated cracks, the dynamic compressive strength of the sandstone specimens decreases in a quadratic function, the dynamic strain decreases in a power exponential function, and the dynamic elastic modulus decreases linearly. Attempts were made to quantitatively analyze the crushing degree of sandstone specimens. The average particle size of the crushed specimens was negatively correlated with the thickness of prefabricated cracks, and the fractal dimension was linearly negatively correlated with the dynamic compressive strength. The 1.5–2.5 mm prefabricated fractured sandstone specimens produced airfoil cracks and secondary cracks; the 3–3.5 mm prefabricated fractured specimens produced airfoil cracks, coplanar secondary cracks, and secondary oblique cracks; and the complete specimens were subjected to axial failure to produce axial cracks.

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“…Miwen et al developed a high-pressure grouting test system and analyzed the diffusion characteristics of the grouting slurry under a high-pressure closed environment. Zhang et al developed a single crack, double crack, and three-dimensional orthogonal crack network grouting test system and analyzed the grouting diffusion characteristics of the chemical and cement slurry at different temperatures. Based on the rock mass structure in the water-rich fracture zone, Li et al proposed dominant split grouting and established the grouting diffusion control equation, considering the rheological properties of the grout.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Diffusion Law of Coal-Based Solid Waste Slurry with Grouting Filling in the Gangue Voids of the Caving Zone

Xiang,

Zhen,

et al. 2023

ACS Omega

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Due to the concealment of the caving zone, it is difficult to detect and grasp the diffusion law of the slurry in the voids of the gangue pile. On the preparation of reasonable grouting filling materials, a large-scale three-dimensional gangue grouting filling test system has been established to detect the slurry pressure and resistivity inside the gangue pile and analyze the flow pattern of the slurry in the voids of the gangue pile. The research results show that the slump and bleeding rate of the filling slurry are significantly reduced with the increase of the fly ash content. The optimal ratio of fly ash, coal gangue, and gasification slag is 7:2:1, with a mass fraction of 72%. In the process of grouting, the internal pressure of the gangue pile can be divided into the initial stable stage, the step growth stage, and the pressure stability stage, and the change curve of the pressure sensor at the lower level is similar. The resistance value of the original broken gangue in the experiment is approximately 1600 Ω. Grouting filling forms a slurry−rock mixture, and its resistance continuously decreases with the stable injection of the slurry (minimum value 150 Ω). It is determined that the slurry near the grouting hole mainly diffuses longitudinally with a good void filling effect. The void channels of slurry diffusion are randomly distributed and have different shapes, which hinder slurry flow and diffusion. Slurry particles accumulate and settle at local small voids. Meanwhile, the surface of the gangue blocks is dry, and the slurry absorbs part of the water during diffusion, resulting in the increase of the slurry concentration and the weakening of the lateral diffusion ability. Secondary or multiple grouting can effectively fill the void of the broken gangue and further improve the filling effect.

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Effect of fissure water on mechanical characteristics of rock mass

Cited by 12 publications

References 3 publications

Simulation Study on the Size Effect of Secant Modulus of Rocks Containing Rough Joints

Simulation Study on the Size Effect of Secant Modulus of Rocks Containing Rough Joints

Analysis of the Fracture Characteristics and Crack Propagation Mechanism of Fractured Sandstone under Dynamic Loading

Experimental Study on the Diffusion Law of Coal-Based Solid Waste Slurry with Grouting Filling in the Gangue Voids of the Caving Zone

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