Energy Dissipation and Storage in Underground Mining Operations

Dong, Xiangjian; Karrech, Ali; Başarır, Hakan; Elchalakani, Mohamed; Seibi, Abdennour

doi:10.1007/s00603-018-1534-x

Cited by 37 publications

(16 citation statements)

References 63 publications

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“…The elastic strain energy ( U ) of a rock–coal composite sample under uniaxial loading is given by [25–27] U=12σεe=σ22E,where E is the elastic modulus of the composite sample, ε e is the elastic strain of the composite sample under uniaxial loading and σ is the axial stress. The axial stress is given by σ=Eεexp[−(εε0)m],where ε is the total strain of the composite sample under uniaxial loading, ε 0 is the distribution scale of the Weibull distribution and m is the morphological parameter characterized in the strain form [26].…”

Section: Elastic Energy Attenuation Index Of Rock–coal Composite Samplesmentioning

confidence: 99%

Effects of coal's initial macro-cracks on rockburst tendency of rock–coal composite samples

et al. 2019

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In the present study, uniaxial compression tests were conducted on sandstone–coal composite samples to investigate the effects of original macro-cracks in coal on the rockburst tendency. First, the energy dissipation theory was used to derive the elastic energy attenuation index of composite samples during uniaxial loading. Then, based on the test results obtained, the rockburst tendency of composite samples was evaluated and analysed using the uniaxial compressive strength and elastic energy attenuation index. The results show that the original macro-cracks in coal deteriorated the rockburst tendency of composite samples. The original horizontal cracks had the lowest effect on the rockburst tendency, whereas the vertical penetrating cracks through the coal centre (parallel to the loading direction) displayed the greatest effect. The mechanism by which these macro-cracks weakened the rockburst tendency involved two steps: (i) changing the physical properties and energy accumulation conditions of composite samples and (ii) increasing the energy dissipation of composite samples during uniaxial loading. These aspects are important to understand the rockburst hazards induced by the structural instability and failure of the composite system of coal seam and roof rock during deep coal mining.

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Section: Elastic Energy Attenuation Index Of Rock–coal Composite Samplesmentioning

confidence: 99%

Effects of coal's initial macro-cracks on rockburst tendency of rock–coal composite samples

et al. 2019

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“…60,61 The strain of the material deformation depends on the stress deviation; therefore, the deviatoric component plays an important role in the yield failure. The hydrostatic stress and deviator stress represent a combination of shear effect; from the mesoscopic mechanism, the hydrostatic component causes only volume change, and the stress deviation causes the shape change.…”

Section: Internal Stress Component Solutionmentioning

confidence: 99%

“…The hydrostatic stress and deviator stress represent a combination of shear effect; from the mesoscopic mechanism, the hydrostatic component causes only volume change, and the stress deviation causes the shape change. 60,61 The strain of the material deformation depends on the stress deviation; therefore, the deviatoric component plays an important role in the yield failure. The second stress tensor invariant and strain tensor invariant are calculated as follows:…”

Section: Internal Stress Component Solutionmentioning

confidence: 99%

Failure mechanism and fracture aperture characteristics of hard thick main roof based on voussoir beam structure in longwall coal mining

Zhang

Jin

Song

et al. 2019

Energy Science & Engineering

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The mechanism and fracture aperture of thick hard roof failure were theoretically analyzed from the perspective of elastoplastic mechanics. A uniform load cantilever beam was established by considering the voussoir beam structure and stress condition. According to the stress inverse principle in solving the plane strain problem, the internal stress component analytic solution was deduced. Considering the lateral thrust and shear force and by applying the Mohr-Coulomb failure criterion, the plastic zone boundary equation was obtained. Further analysis of the equivalent stress, equivalent strain, elastic energy density, distortion energy density, and strain energy density was studied with blocks of four different lengths, combined with the rotation angles after failure, to analyze the fissure aperture between straight and curved fracture traces. The theoretical analysis reveals that the deviatoric effect plays the lead role in rupture initiation and propagation; the cracks will deflect during failure, and the fracture trace presents a curved shape. The variation of fracture aperture exhibits a tendency to increase first, then decrease, and then increase along the fracture trace.The analytical approach presented in this paper provides a theoretical basis for determining the main seepage channel flow in underground mining. K E Y W O R D Sfailure mechanism, fracture aperture, theoretical analysis, thick hard roof, underground mining, voussoir beam structure

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“…Moreover, this induced damage to rock mass. Dong et al [27] studied the energy evolution process of the rock masses in the mining process. According to the variation tendency of energy, the dissipating process was divided into the initiating stage, the stable increasing stage, the dramatic increasing stage, and the stable stage.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Anchorage Body Fracture Evolution and the Energy Dissipation Rule: Comparison between Tensioned Rock Bolts and Torqued Rock Bolts

Wang

Bai

et al. 2021

Advances in Civil Engineering

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Rock bolt support is an effective technique for controlling surrounding rock of deep roadway. The stability of the anchorage body composed of rock bolts and surrounding rock mass is the core in keeping the stability of roadways. In this paper, the UDEC Trigon model was used in simulating uniaxial compressive test on the anchorage body under different pretension loads. The energy equilibrium criterion of the anchorage body under the uniaxial compressive state was proposed. Furthermore, the fracture evolution and the energy dissipation during the failure process of the anchorage body were analyzed. Results showed that before the peak strength, the external work was stored in the anchorage body in the form of the elastic strain energy (Ue). After the peak, energy dissipated through three ways, including the fracture developing friction (Wf), plastic deformation (Wp), and acoustic emission (Ur). Based on the simulation results, the high pretensioned rock bolts can eliminate the continuous tensile fractures in the anchorage body, decreasing the damaging extent of the anchorage body and the energy that was consumed by the following two main approaches: fracture developing friction (Wf) and plastic deformation (Wp). Moreover, the surplus of the elastic strain energy (Ue) and the strength of the anchorage body can be improved. The pretension load had a positive relationship with elastic strain energy and a negative relationship with the anchorage body damage degree. Based on the above research, the transport roadway of the working face 6208 in the Wangzhuang Coal Mine selected tensile rock bolts to establish the high-performance anchorage body. The monitoring data showed that this reinforcement method effectively managed the serious deformation issue of the roadway surrounding the rock masses.

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Energy Dissipation and Storage in Underground Mining Operations

Cited by 37 publications

References 63 publications

Effects of coal's initial macro-cracks on rockburst tendency of rock–coal composite samples

Effects of coal's initial macro-cracks on rockburst tendency of rock–coal composite samples

Failure mechanism and fracture aperture characteristics of hard thick main roof based on voussoir beam structure in longwall coal mining

A Study of the Anchorage Body Fracture Evolution and the Energy Dissipation Rule: Comparison between Tensioned Rock Bolts and Torqued Rock Bolts

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