A Review of Hydromechanical Coupling Tests, Theoretical and Numerical Analyses in Rock Materials

Zhao, Yanlin; Liu, Qiang; Lin, Hang; Wang, Yixian; Tang, Wenyu; Liao, Jian; Yang, Lixue; Wang, Xiaguang

doi:10.3390/w15132309

Cited by 17 publications

(7 citation statements)

References 139 publications

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“…Through numerical simulation analysis, it is finally determined that the reasonable cutting height and cutting angle are 7 m and 15°, respectively, and the reasonable borehole spacing for the top cutting and pressure relief is 500mm. To further verify the reliability of the top cutting and pressure relief parameters, the above parameters are placed into formula (8). e1 = 3.42MPa is calculated that σ1= 3.42MPa, which is greater than the tensile strength of the limestone (3.0MPa), indicating that the top cutting and pressure relief parameters determined by numerical simulation can effectively remove the hard roof and achieve good pressure relief effects.…”

Section: Determination Of the Borehole Spacingmentioning

confidence: 99%

“…In the field of coal mining, control of the surrounding rock on roads is a complex process that runs through every stage of deformation of the surrounding rock, which has an important impact on the sustainable development of the coal industry [1,2]. The deformation of the surrounding rock is mainly affected by factors such as joint fissures [3,4], the appearance of rock strata [5,6], tectonic stress [7,8], blasting disturbance [9,10], and seepage characteristics [10][11][12][13]. Effective control of surrounding rock deformation is an important premise to ensure the safety of mine production.…”

Section: Introductionmentioning

confidence: 99%

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Research on Collaborative Control Technology of Pressure Relief and Support for Retaining Roadway along Goaf with Hard Roof

Guo,

Liu,

Zhang

et al. 2024

Preprint

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According to field observation of the deformation of the reserved roadway with a hard roof, the shrinkage of the roof and floor on the goaf side is greater than on the coal side, and the surrounding rock of the road is in a long-term rheological deformation state. Through theoretical analysis, the relationship between the tensile stress of the rock and the top cutting and pressure relief parameters is expounded. In a certain range, with increasing cutting height and cutting angle, the tensile stress of the hard rock strata without top cutting is also greater, which is conducive to caving the roof. Through numerical simulation analysis, when the cutting height and cutting angle are 7m and 15 °, respectively, the deformation and stress of the surrounding rock are small and tend to be stable. Combined with theoretical calculation and construction cost, this parameter is determined to be the best top cutting parameter. Based on the failure causes of the retaining road along the hard roof and the need for strengthening support of the roof, the synergistic surrounding rock control technology of pressure relief and support is proposed. After adopting the surrounding rock control technology of roof cutting and pressure relief + constant resistance large deformation anchor cable of constant resistance support, the maximum deformation of the roof and floor of the reserved roadway is reduced from 750mm to 322 mm, and the maximum deformation of the solid coal is reduced from 486mm to 205mm. The surrounding rock control effect is good. The successful application of this technology improves the recovery rate of 090109 working face in Baigou Coal Mine and realizes the sustainable development and utilization of coal resources. It also provides guidance and reference for the control of surrounding rocks with similar roof conditions.

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Section: Determination Of the Borehole Spacingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Collaborative Control Technology of Pressure Relief and Support for Retaining Roadway along Goaf with Hard Roof

Guo,

Liu,

Zhang

et al. 2024

Preprint

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“…Notably, the box dimension characterisation method used in this study has a somewhat defective nature. (1) The original cracks are manually marked using Ratsnake. The filling of cracks and the ejection criteria of fragments of samples have certain subjective factors.…”

Section: Crack Quantification and Box Dimension Calculationmentioning

confidence: 99%

“…Underground mining in Xinjiang, Qinghai, and other cold regions has been increasing. The artificial freezing method in mining and digging has received widespread attention from scholars due to its adaptability to various complex engineering conditions and improvement of safety in construction [1], such as the construction of railways on the Tibetan Plateau and the application and development of coal mine freezing methods for well drilling technology [2]. The freezing method of drilling is the application of artificial refrigeration technology to vertical-or inclined-shaft engineering through the temporary freezing of groundwater to consolidate the stability of the underground coal and rock to reduce the occurrence of collapse accidents during the mining process [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Multiple Fractalisation of Coal and Rock Failure Subjected to the Coupled Effects of Water, Temperature and Dynamic Loads

Jin,

Sun,

Liu

et al. 2023

Applied Sciences

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The mechanical properties of water-rich coal and rock in a subzero environment are very different from those at room temperature, which causes many unexpected hazards for projects. In this study, coal and rock samples subjected to the coupled effects of water, temperature, and dynamic loads were taken as the research object, and the discussion was shaped around their mechanical properties. The crack evolution trend and different gradient impact velocities were determined using a split-Hopkinson pressure bar (SHPB). Multiple fractals were based on high-speed digital image correlation (HS-DIC) technology and the quality-screening method; the evolution trend of the surface cracks in the crushing process and the distribution characteristics of the specimen fragments after crushing were examined from the perspective of fractals. This provided a powerful supplement to the existing research system on the problem of mining via the freezing method, and it accounted for the shortcomings of the existing research to a certain extent. In this research, the results mainly showed four points: (1) The coal samples were determined to have a wave velocity between 1.68 and 2.01 km/s, while the rock samples were between 2.24 and 2.61 km/s. Under the same conditions, the rock’s resistance to deformation and damage was greater than that of coal. (2) In the saturated state, the plastic strength of the coal and rock samples was greater than that in the dry state, due to the strengthening of their internal stresses caused by the presence of fissure water. (3) With decreasing temperature, the degree of the dynamic compression factor of coal and rock showed a trend of initially increasing, then decreasing, and then increasing. With the increase in the loading rate, the destruction of the coal and rock was more intense, and the destruction process was accelerated. (4) After the saturated coal and rock samples were frozen, their interiors were affected by the dual factors of contraction under the influence of temperature and expansion under the influence of the freezing expansion force. The internal fissures closed or shrank, and the water in the pores turned into ice, leading to an increase in pore volume.

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“…Unlike conventional adsorbents, coal rock has strong inhomogeneity and a complex pore structure, which leads to the complexity of CH 4 /CO 2 adsorption by coal rock, and different coal matrixes, especially microporous surface structure, component characteristics, etc., play a strong controlling role on CH 4 /CO 2 . Therefore, it may be more reasonable to analyze the adsorption of CH 4 /CO 2 from a microscopic molecular point of view [16][17][18][19]. Li et al researched the effect of coal rank and moisture on the competitive adsorption of CH 4 and CO 2 through molecular simulations [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of CH4 Displacement through Different Sequential Injections of CO2/N2

Bai,

Li,

et al. 2023

Sustainability

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As a clean energy source, coalbed methane (CBM) produces almost no exhaust gas after combustion, and its extraction and efficient utilization play a key role in supporting sustainable development. Therefore, molecular dynamics simulations were used to research the diffusion of CH4 in coal after injecting CO2/N2 in different sequences and to clarify the efficiency of CBM extraction under different injection sequences, so as to contribute to sustainable development. The results show that the adsorption amounts of CO2 and N2 in different injection sequences are obviously different. To narrow the gap between the two injection amounts, the injection pressure of N2 can be appropriately increased and that of CO2 can be reduced, or N2 can be injected preferentially instead of CO2. When CO2 is injected first, the interaction energy between CH4 and coal is stronger and increases slightly with displacement time as a whole. The interaction energy curve of the N2 injection decreases, and the displacement effect becomes worse and worse. From the diffusion and relative concentration distribution of CH4, it can be seen that the diffusion of CH4 molecules outside the grain cell is more obvious when N2 is injected first. In terms of the number of CH4 molecules diffusing outside the crystal cell, it is less when CO2 is injected first than when N2 is injected first. The average value of the velocity distribution of CH4 increases slightly when CO2 is injected first and decreases significantly when N2 is injected first, but the average value is overall higher for N2 injection first. From the difference in diffusion coefficients before and after the gas injection, it can be seen that the decrease in permeability due to the expansion of the coal matrix by CO2 is more obvious than the increase in permeability due to the contraction of the coal matrix by N2.

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A Review of Hydromechanical Coupling Tests, Theoretical and Numerical Analyses in Rock Materials

Cited by 17 publications

References 139 publications

Research on Collaborative Control Technology of Pressure Relief and Support for Retaining Roadway along Goaf with Hard Roof

Research on Collaborative Control Technology of Pressure Relief and Support for Retaining Roadway along Goaf with Hard Roof

Experimental Study of the Multiple Fractalisation of Coal and Rock Failure Subjected to the Coupled Effects of Water, Temperature and Dynamic Loads

Molecular Dynamics Simulation of CH4 Displacement through Different Sequential Injections of CO2/N2

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