Assessment and analysis of strata movement with special reference to rock burst mechanism in island longwall panel

Zhu, Guang-an; Li, Dou; Cao, Anye; Cai, Wu; Wang, Changbin; Liu, Zhigang; Li, Jing

doi:10.1007/s11771-017-3709-0

Cited by 18 publications

(15 citation statements)

References 13 publications

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“…To our knowledge, the range evolution of the separation space is proposed herein for the first time considering the strata distribution. In the case of deep-buried and thin coal seams, the continuum mechanics method was used previously for predicting the stress, deformation, and fracture properties of the KS when the strata are uniformly distributed [6,7,9,29]. However, the grouting parameters of Buliangou mine cannot be concluded from that approach because it was conducted with a lack of consideration of the research object (many articles regard the KS as the research object rather than the separation space) [8], a lack of consideration of the continuum mechanics method not being suitable for broken strata [11], a lack of consideration of strata distribution, and especially a lack of consideration of the number of KS [30].…”

Section: Discussionmentioning

confidence: 99%

“…Through similar simulation experiments, Yan et al [7] analyzed the influence of different topsoil thicknesses and step beams caused by mining on surface cracks. Based on "voussoir beam" theory [8], Zhu et al [9] studied the law of ground settlement under the condition of a thin coal seam using a theoretical calculation method. Using the Levenberg-Marquardt algorithm for nonlinear curve fitting of ground settlement data in the Fushun mining area, an inverse tangent function model was proposed by Nie et al [10] to predict curves of ground settlement under conditions of a thick hard rock stratum.…”

Section: Introductionmentioning

confidence: 99%

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Surface Water Resource Protection in a Mining Process under Varying Strata Thickness—A Case Study of Buliangou Coal Mine, China

Zhang

Bai

et al. 2018

Sustainability

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The mining of shallow buried and thick coal seams may cause ground settlement, loss of surface water, and even soil desertification in arid–semi-arid climate zones. The key to protecting surface water resources through the technology of separated strata grouting is to study the evolution of the separation space under the key stratum (KS) with the change of strata. Aiming at the section of underground strata characteristics of F6202 and F6208 working faces, similar simulation tests under three typical geological conditions were carried out. Based on the experimental results, a theoretical calculation model was established, and the practice of separation grouting was carried out. The results show that, under the conditions of a thick coal seam with one KS, the structure formed by breaking strata below the KS was relatively unstable, and the separation space was relatively large, which is likely to cause serious ground settlement. More seriously, with the increase of the weakly consolidated layer and coal seam thickness, the increase of the ratio of rock to soil in the weakly consolidated layer, and the decrease of the thickness of the strata below the KS (two KS condition), the separation space was further increased. Based on the above analysis, combined with the real-time feedback data of the grout amount and pressure on hydraulic support, the position of the grouting borehole was determined, and the speed of mining advance was adjusted in time, thus effectively controlling the curvature of the ground settlement, protecting the integrity of the red clay layer near the surface, and consequently protecting water resources.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Water Resource Protection in a Mining Process under Varying Strata Thickness—A Case Study of Buliangou Coal Mine, China

Zhang

Bai

et al. 2018

Sustainability

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“…The setting of NSCPs should not only improve the support quality and safety of personnel and equipment inside the roadway but also reduce the risk of potential rock burst hazard. It can be seen from Figure 3 that both yielding and supporting coal pillars can efficiently guarantee the stability of roadway (Zhu et al, 2017). The supporting coal pillar (SCP) can sustain loads applied to the overlying strata, where a sudden stability loss is unlikely.…”

Section: Setting Nscps To Protect Roadwaysmentioning

confidence: 99%

Comprehensive technical support for safe mining in ultra-close coal seams: A case study

Zhang

Guo

Xie

et al. 2021

Energy Exploration & Exploitation

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In order to mine the coal seam under super-thick hard roof, improve the utilization rate of resources and prolong the remaining service life of the mine, a case study of the Gaozhuang Coal Mine in the Zaozhuang Mining Area has been performed in this paper. Based on the specific mining geological conditions of ultra-close coal seams (#3up and #3low coal seams), their joint systematic analysis has been performed, with the focus made in the following three aspects: (i) prevention of rock burst under super-thick hard roof, (ii) deformation control of surrounding rock of roadways in the lower coal seam, and (iii) fire prevention in the goaf of working face. Given the strong bursting tendency observed in upper coal seam and lower coal seam, the technology of preventing rock burst under super-thick hard roof was proposed, which involved setting of narrow section coal pillars to protect roadways and interleaving layout of working faces. The specific supporting scheme of surrounding rock of roadways in the #3low1101 working face was determined, and the grouting reinforcement method of local fractured zones through Marithan was further proposed, to ensure the deformation control of surrounding rock of roadways in lower coal seams. The proposed fire prevention technology envisaged goaf grouting and spraying to plug leaks, which reduced the hazard of spontaneous combustion of residual coals in mined ultra-close coal seams. The technical and economic improvements with a direct economic benefit of 5.55 million yuan were achieved by the application of the proposed comprehensive technical support. The research results obtained provide a theoretical guidance and technical support of safe mining strategies of close coal seams in other mining areas.

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“…Rock bursts, which are sudden dynamic disasters induced by deformation and fracture of the coal-rock mass, pose a serious threat to the production and safety of underground coal mining throughout the word [1,2]. Pillar burst is one of the typical types of rock burst called strain burst, which is caused by violent fracturing of intact rock and, in many cases, occurs in the vicinity of mining openings or pillars [3,4].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior of Coal Pillar under Different Load Percentage by Numerical Simulation

Dong

Liu

Zhu

2021

Advances in Civil Engineering

Self Cite

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The stability and dynamic response of coal pillar is of great importance in underground coal mining. In this paper, a series of uniaxial compressive experiments were first carried out to investigate the mechanical properties of coal. Subsequently, a statistical constitutive damage model for coal was proposed and applied to the numerical simulation. The proposed strain damage softening function showed almost the same goodness-of-fit on the experimental curve. According to this investigation, a numerical model FLAC3Dwas created to investigate the dynamic behavior of the coal pillar under different load percentage (LP). Modelling suggests that the incident and transmitted wave stress evolution observes similar rule and its process can be divided into three stages, namely, static preload, dynamic disturbance, and stabilized stages. The effects of dynamic disturbance intensity are also studied at 10 MPa, 20 MPa, and 30 MPa of peak stress, respectively. The results indicate that under the same load percentage, the peak incident and transmitted wave stress increase with the increase of dynamic disturbance intensity. On the contrary, the attenuation decreases. It is also observed that the failure zone interior the coal can be predicted by the wave propagation.

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Assessment and analysis of strata movement with special reference to rock burst mechanism in island longwall panel

Cited by 18 publications

References 13 publications

Surface Water Resource Protection in a Mining Process under Varying Strata Thickness—A Case Study of Buliangou Coal Mine, China

Surface Water Resource Protection in a Mining Process under Varying Strata Thickness—A Case Study of Buliangou Coal Mine, China

Comprehensive technical support for safe mining in ultra-close coal seams: A case study

Dynamic Behavior of Coal Pillar under Different Load Percentage by Numerical Simulation

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