Multi-parameter numerical simulation of dynamic monitoring of rock deformation in deep mining

Li, Juanjuan; Hu, Mingshun; Ding, Enjie; Kong, Weijie; Pan, Dong; Chen, Shen-En

doi:10.1016/j.ijmst.2016.05.044

Cited by 13 publications

(4 citation statements)

References 5 publications

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“…Yuan et al trained the GA-SVM prediction model for non-mining fractures of mine shafts by using measured data [14]. Li et al provided a new mean for shaft stability testing: the multi-parameter dynamic monitoring methods using numerical simulation software FLAC3D [15]. Zhang et al determined the safety evaluation index of shaft stability and established the safety evaluation model of soft-rock inclined shaft engineering by combining the fuzzy comprehensive evaluation method and field-measured data [16].…”

Section: Introductionmentioning

confidence: 99%

Critical Instability Criterion of Large-Diameter Shafts in Deep Topsoil Based on Ultimate Strain Analysis

et al. 2022

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Shaft stability plays an important role in mine safety. Most of the previous studies focused on the stress analysis of shafts using monitoring data. Since the shaft wall state in the deep topsoil stratum is still not clear, the ultimate analysis method is adopted to study the bearing capacity and the strain of a large-diameter shaft wall in Yanzhou coal mine. First, the bearing capacity of the shaft wall is discovered. The value of the auxiliary shaft, main shaft and ventilating shaft is 22.22 MPa, 22.07 MPa and 21.73 MPa, respectively. Then, the ultimate strain of the shaft wall is obtained; the designed ultimate strain corresponding to those shafts is 1.468‰, 1.458‰ and 1.435‰, while the working ultimate strain is 2.078‰, 1.800‰ and 2.638‰, respectively. Since the working values are greater than the design values, the shaft walls need to be reinforced, which is consistent with the field situation. Finally, numerical analysis based on the finite difference method (FDM) is performed to investigate the evolution process of ultimate strain on the shaft wall. The results show the ultimate strain could provide a theoretical basis for safe service and management of a large-diameter shaft in a deep topsoil area.

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Section: Introductionmentioning

confidence: 99%

Critical Instability Criterion of Large-Diameter Shafts in Deep Topsoil Based on Ultimate Strain Analysis

et al. 2022

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“…Unlike the empirical techniques, numerical methods [18] can be used for evaluating deformation development progress of surrounding rock masses in mining geological and geotechnical conditions [19]. Li et al [20] presupposed single monitoring information (e.g., resistivity profiles and source position messages) and presented multiparameter dynamic monitoring methods. These methods were validated using numerical simulation results.…”

Section: Introductionmentioning

confidence: 99%

Experiment Study on Mechanical Evolution Characteristics of Coal and Rock under Three-Dimensional Triaxial Stress

Tao

Zhang

et al. 2022

Applied Sciences

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The surrounding rock is in a complex stress environment and its mechanical behavior is also complex, especially after the excavation of the coal seam, the phenomenon of stress release of surrounding rock often occurs. The vertical stress and horizontal stress of the surrounding rock mass will have a series of complex changes. In underground engineering, rock mass is affected by dead weight pressure and tectonic stress. With coal mine production, the original stress of surrounding rock is demolished, and the destruction of surrounding rock is reflected in the loading and unloading failure of three-dimensional stress. Aiming at the phenomenon, this paper takes the Pingshuo East open-pit mine as the research background, and the experiments on physical and mechanical parameters of coal and rock mass was carried out, obtaining the coal and rock mechanics parameters, such as elastic modulus, Poisson’s ratio, internal friction angle, cohesive force, etc. The stress strain curve was created based on the conventional triaxial experiment of coal and rock under different confining pressure conditions. According to the characteristics of these curves, we obtain underground engineering rock mass unloading stress–strain variation characteristics. Through establishing a stress–strain equation based on confining pressure, we finally describe the mechanical failure characteristics of rock under triaxial stress.

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“…As the coal mining goes deeper, a series of problems appear, such as the rise of rock pressure, the aggravation of roadway deformation, and the acceleration of surrounding rock convergence deformation. The increasingly serious stent damage may lead to roof collapse and other rock accidents (Huang et al., 2016; Li et al., 2016). Therefore, reasonable monitoring of roadway deformation and accurate grasping of surrounding rock state and development trend have great significance for ensuring the safe production of coal mines.…”

Section: Introductionmentioning

confidence: 99%

“…Before deep mining, coal and rock deformation stays in the state of stress equilibrium until it is affected by the gravity stress and tectonic movement (Li et al, 2016(Li et al, , 2015bWang et al, 2016). With the development of roadway and the mining of coal seam, the original stress balance is destroyed, thus redistributing stress in the surrounding rock and forming the secondary stress (Meng et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Deformation and damage dynamic characteristics of coal–rock materials in deep coal mines

Zhou

Song

et al. 2017

International Journal of Damage Mechanics

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The deformation and damage characteristics of surrounding rock grow gradually with the increase of mining depth, and the mechanical behavior and damage mechanism of coal–rock materials vary greatly. In order to reveal the deformation and damage dynamic characteristics of coal–rock materials in deep mines, the macroscopic deformation characteristics of coal, rock, and concrete samples under uniaxial compression were studied. The macroscopic deformation amount, velocity, and acceleration of different samples were analyzed. The coal and rock samples exhibit regular dynamic characteristics before they lose stability and fail. The axial strain response of the coal samples changes significantly during the compact and elastic deformation stages. Besides, the relationship between the surface damage and the macroscopic deformation of sample was studied by means of visualization and image processing. The macroscopic deformation index of coal–rock materials changes significantly before and after the destabilization and failure. Based on the deformation and failure dynamic characteristics of coal and rock, the evolution rule of deformation critical values was taken as the deformation and destruction stages, which revealed the dynamic characteristics during the deformation and failure process of coal–rock materials in deep mines. The deformation critical values can be used to realize early warning of deformation and fracture of coal and rock materials in deep mines.

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Multi-parameter numerical simulation of dynamic monitoring of rock deformation in deep mining

Cited by 13 publications

References 5 publications

Critical Instability Criterion of Large-Diameter Shafts in Deep Topsoil Based on Ultimate Strain Analysis

Critical Instability Criterion of Large-Diameter Shafts in Deep Topsoil Based on Ultimate Strain Analysis

Experiment Study on Mechanical Evolution Characteristics of Coal and Rock under Three-Dimensional Triaxial Stress

Deformation and damage dynamic characteristics of coal–rock materials in deep coal mines

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