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主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
排矸方式对矸石山稳定性的研究
  • Title

    Study on stability of gangue mountain in discharging method

  • 作者

    李建华陈涛杨木林

  • Author

    LI Jianhua,CHEN Tao,YANG Mulin

  • 单位

    神华包头能源有限责任公司李家壕煤矿中国矿业大学矿业工程学院

  • Organization
    Lijiahao Mine,Shenhua Baotou Energy Corporation Ltd.,;School of Mines,China University of Mining and Technology
  • 摘要

    为探究排矸方式对矸石山稳定性影响规律,提出有利于提高矸石山稳定性效果的矸石排弃方法。首先依据矸石来源进行分类,通过对矸石试样单轴压缩力学试验测试,分析其力学性质的特征及产生该特征的原因,进而针对李家壕矸石山建立模型,利用数值模拟软件GeoStudio中的SIGMA/W模块和SLOPE/W模块进行父子项分析,采用模拟软件的有限元计算方法分析矸石山内部的应力分布状态,根据应力重分布状态,结合极限平衡法对力学参数折减,得出采煤工作面矸石在不同排弃方式条件下对矸石山整体稳定性的影响规律,并对采煤工作面矸石在不同排矸方式与不同埋深两种耦合条件下,得出矸石山的稳定性变化规律,最终提出有利于矸石山稳定性的排矸方式。结果表明:矿井生产过程中根据矸石来源不同可分为采煤工作面矸石和掘进工作面矸石,这两类矸石的强度存在差异,采煤工作面矸石强度明显弱于掘进工作面矸石强度,试验表明掘进工作面矸石试样的平均单轴抗压强度是采煤工作面矸石试样的1.6倍;不同排矸方式下采煤工作面矸石排弃后坡顶线位置相同,且剖面上排矸面积相同条件下,平铺式、倾倒式排矸方式相比均一参数矸石山稳定性系数,分别降低了16.4%和29.0%,平铺式排矸更有利于矸石山的稳定性;采煤工作面矸石采用平铺式排矸时,其埋深的变化对矸石山稳定性影响较小,深度为0时稳定性系数为1.56,降低7.9%,深度为5 m时稳定性系数为1.53,降低9.6%;而采用倾倒式排矸时,埋深的变化对矸石山稳定性影响较大,深度为0时稳定性系数为1.09,降低35.3%,深度为5 m时稳定性系数为1.07,降低36.5%,且危险滑动面常贯穿采煤工作面矸石层。

  • Abstract

    In order to explore the influence law of the discharging method on the stability of the meteorite mountain,a method of removing the meteorite that is beneficial to improve the stability of the meteorite mountain is proposed. This paper firstly classifies according to the source of meteorite. Through the experimental test of uniaxial compression mechanics of vermiculite samples,the characteristics of the mechanical properties and the reasons for the characteristics are analyzed. Then the model is established for Lijiahao coal gangue mountain,using the numerical simulation software GeoStudio. The SIGMA/W module and the SLOPE/W module are used for parent-child analysis. The finite element calculation method of the simulation software is used to analyze the stress distribution state inside the meteorite mountain. According to the stress redistribution state,the limit equilibrium method is used to reduce the mechanical parameters. The influence law of coal working face vermiculite on the overall stability of meteorite in different ways of abandonment,and the stability of meteorite in the coal mining face meteorite under different coupling modes and different buried depths Change the law,and finally propose a discharging method that is conducive to the stability of the meteorite. The results show that the mine production process can be divided into coal mining face gangue and driving face gangue according to different sources. The strength of these two types of gangue is different. The strength of coal mining face gangue is obviously weaker than that of driving face gangue. It shows that the average uniaxial compressive strength of the gangue sample of the tunneling face is 1.6 times that of the gangue sample of the coal face; the position of the slope top line is the same after the gangue of the coal face is discharged under different drainage methods,and the gangue is discharged on the section under the same areaconditions,compared with the uniform parameter gangue dump stability coefficient,the flat paving and dumping gangue discharge methods have reduced the stability coefficient by 16.4% and 29.0% respectively. The flat gangue discharge is more conducive to the stability of the gangue hill; When the surface gangue adopts the flat-layed gangue discharge,the change of its buried depth has little effect on the stability of the gangue hill. When the depth is 0,the stability coefficient is 1.56,which is reduced by 7.9%. When the depth is 5 m,the stability coefficient is 1.53,which is reduced by 9.6 %; When the dumping type gangue is used,the change of buried depth has a greater impact on the stability of the gangue hill. When the depth is 0 m,the stability coefficient is 1.09,which is reduced by 35.3%,and when the depth is 5 m,the stability coefficient is 1.07,which is reduced by 36.5%. And the dangerous sliding surface often runs through the gangue layer of coal mining face. 

  • 关键词

    矸石山应力分布稳定性系数排矸方式数值模拟

  • KeyWords

    coal gangue mountain; stress distribution; coefficient of stability; discharging method; numerical simulation

  • 基金项目(Foundation)
    国家重点研发计划资助项目(2016YFC0501103);国家自然科学基金面上资助项目(51774271,51674245)
  • 引用格式
    李建华,陈涛,杨木林.排矸方式对矸石山稳定性的研究[J].煤炭科学技术,2022,50(3):308-315.
    LI Jianhua,CHEN Tao,YANG Mulin.Study on stability of gangue mountain in discharging method[J].Coal Science and Technology,2022,50(3):308-315.
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