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Dynamic disaster control of backfill mining under thick magmatic rock in one side goaf: A case study

一侧采空厚层岩浆岩条件下充填开采对动力灾害的控制:案例研究

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Abstract

In order to explore the control effect of backfill mining on dynamic disasters under special geological mining conditions of overlying thick magmatic rock (TMR), a three-dimensional numerical model of a panel of one side goaf in Yangliu coal mine with double-yield backfill material constitutive model was developed. The simulation results were then compared with field monitoring data. The dynamic disaster control effect of both caving and backfill mining was analyzed in three different aspects, i.e., displacement field, stress field and energy field. The results show that in comparison to the full caving mining method, the bearing capacity of the goaf after backfilling was enhanced, the backfill mining can effectively reduce the stress and energy accumulated in the coal/rock body, and the backfill mining eliminates the further moving space of TMR and prevents its sudden rupture. Before TMR fracture, the subsidence displacement of TMR was reduced by 65.3%, the front abutment stress of panel decreased by 9.4% on average and the high energy concentration zone around panel was also significantly reduced. Overall, the results of this study provide deeper insights into the control of dynamic disasters by backfill mining in mines.

摘要

为了研究充填开采对上覆厚层岩浆岩特殊地质开采条件下动力灾害的控制效果,建立了杨柳煤 矿工作面一侧采空条件下双屈服充填材料本构模型的三维数值模型,并将数值模拟结果与现场监测数 据进行了对比。从位移场、应力场和能量场三个方面分析了垮落开采法和充填开采法的动态灾害控制 效果。结果表明,与垮落开采法相比,充填后采空区的承载能力得到了提高,充填开采法能有效地降 低煤岩体中积聚的应力和能量,消除了厚层岩浆岩的进一步移动空间,防止了厚层岩浆岩的突然破断。 厚层岩浆岩断裂前,其沉降位移减少了65.3%,工作面前支承应力平均降低了9.4%,工作面周围的高 能量集中区也明显减少。总的来说,本研究的结果为矿山充填采矿动力灾害的控制提供了深入的见解。

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Abbreviations

e :

Elastic part

p:

Plastic part

p s :

Plastic shear strain

p t :

Plastic tensile strain

p v :

Plastic volumetric strain

K c :

Tangential bulk moduli

G c :

Shear moduli

Φ :

Angle of internal friction

c :

Cohesion

σ t :

Tensile strength

p c :

Cap pressure

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Authors and Affiliations

  1. Center for Rock Instability and Seismicity Research, Northeastern University, Shenyang, 110819, China

    Yan-chao Xue  (薛彦超), Tao Xu  (徐涛), Tian-hong Yang  (杨天鸿) & Teng-fei Fu  (付腾飞)

  2. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang, 110819, China

    Yan-chao Xue  (薛彦超), Tao Xu  (徐涛), Tian-hong Yang  (杨天鸿) & Teng-fei Fu  (付腾飞)

  3. College of Engineering and Science, Victoria University, Melbourne, Australia

    P. L. P. Wasantha

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  1. Yan-chao Xue  (薛彦超)
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  2. Tao Xu  (徐涛)
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Contributions

XU Tao led the project and expanded the manuscript. Initial draft, numerical modeling and analysis were carried out by XUE Yan-chao. YANG Tian-hong also led the project. WASANTHA P L P improved the language and provided valuable suggestions. FU Teng-fei edited the draft of manuscript. All authors contributed to the writing of the manuscript.

Corresponding author

Correspondence to Tao Xu  (徐涛).

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Conflict of interest

XUE Yan-chao, XU Tao, WASANTHA P L P, YANG Tian-hong and FU Teng-fei declare that they have no conflict of interest.

Foundation item: Project(2017YFC1503100) supported by the National Key Research and Development Program of China; Projects(51974062, 41672301, 51811530312) supported by the National Natural Science Foundation of China; Project(N180101028) supported by the Fundamental Research Funds for the Central Universities, China

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Xue, Yc., Xu, T., Wasantha, P.L.P. et al. Dynamic disaster control of backfill mining under thick magmatic rock in one side goaf: A case study. J. Cent. South Univ. Technol. 27, 3103–3117 (2020). https://doi.org/10.1007/s11771-020-4532-6

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