• 论文
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
浅埋双向倾斜工作面综放开采矿压显现规律研究
  • Title

    Study on ground pressure behavior law of fully-mechanized top-coal caving mining in shallow buried two-way inclined working face

  • 作者

    郭焘张坤铭

  • Author

    GUO Tao,ZHANG Kunming

  • 单位

    重庆大学资源与安全学院国家能源投资集团有限责任公司安全环保监察部中国矿业大学(北京) 能源与矿业学院

  • Organization
    School of Resources and Security,Chongqing University;Safety and Environmental Protection Supervision Department, CHN Energy Investment Group Co.,Ltd.,;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing
  • 摘要

    神华亿利能源有限责任公司黄玉川煤矿216采区内5个工作面中部有构造隆起,导致工作面走向和倾向方向上都存在不同程度的倾角,形成双向倾斜综放工作面。尤其是216上01工作面开采过程中,面临大坡度俯采条件,对综放工作面的设备稳定性产生影响,同时也给顶煤放出和采场矿压控制带来挑战。为解决黄玉川煤矿双向倾斜工作面综放开采矿压加强支护管理的难题,运用FLAC3D软件模拟分析了黄玉川煤矿双向倾斜工作面矿压显现规律,并根据数值模拟结果,提出了管控措施。研究结果表明:近水平综放工作面开采过程中,采场周边的垂直应力、垂直位移和塑性区分布在倾斜方向上是呈现对称分布的,并且在走向方向上有规律波动,而双向倾斜综放工作面则是不均衡分布和无规则变化的。因此可以判断出双向倾斜综放工作面的开采容易造成顶板的偏应力集中,低水平位置的回采巷道矿压显现会更加剧烈,需要加强支护和管理。通过PFC2D软件模拟顶煤开采过程中顶煤流动规律及冒落情况,研究了顶煤流动及放出规律,发现顶煤采出率随着俯采角的增大基本呈现出逐步减小的变化趋势,因此在现场生产中,应当对大倾角综放开采放煤工艺进行针对性地优化。不同放煤工艺下顶煤采出率及顶煤放出量规律模拟结果表明2轮或3轮顺序放煤方式条件下,顶煤的采出率高,说明多轮放煤可以让顶煤缓慢均匀下沉,最大限度减少顶板矸石的混入。根据模拟结果和现场可操作性最终确定了黄玉川煤矿的放煤方式是一刀一放、两轮顺序放煤。

  • Abstract

    Through the analysis of the geological conditions of the extra thick coal seam working face in Huangyuchuan Coal Mine of Shenhua Yili Energy Co.,Ltd.,it is found that there are structural uplifts in the middle of the five working faces in No.216 mining area,resulting in different degrees of working face direction and inclination.The inclination angle is formed to form a two-way inclined fully mechanized caving face,especially in the mining process of 216 upper No.1 working face,it is faced with the conditions of large slope mining,which has an impact on the equipment stability of the fully-mechanized top-coal caving face,and also brings challenges to top-coal caving and stope pressure control.In order to solve the problem of strengthening support management in fully-mechanized top-coal caving mining of two-way inclined working face in Huangyuchuan Coal Mine,FLAC3D software was used to simulate and analyze the mine pressure behavior law of two-way inclined working face in Huangyuchuan Coal Mine,and based on the numerical simulation results,the control measures for the working face were put forward.The research results show that:during the mining process of near-horizontal fully-mechanized top-coal caving face,the distribution of vertical stress,vertical displacement and plastic zone around the stope are symmetrically distributed in the inclined direction,and fluctuate regularly in the strike direction,while the distribution of two-way inclined fully-mechanized top-coal caving face is unevenly distributed and varies irregularly.Therefore,it can be judged that the mining of two-way inclined fully-mechanized top-coal caving face is likely to cause concentration of deviatoric stress on the roof,and the mine pressure behavior of the mining roadway at the low level position will be more severe,and it is necessary to strengthen the support and management.By simulating the flow law and caving situation of top coal in the process of top coal mining by PFC2D software,the flow and release law of top coal is studied.It is found that the top-coal recovery rate basically presents a gradual decreasing trend with the increase of dip angle.Therefore,in the field production,the coal caving process of fully-mechanized top-coal caving with large dip angle should be optimized.At the same time,the top-coal recovery rate and top-coal discharge rule under different coal caving processes are studied.The simulation results show that the recovery rate of top-coal is high under the condition of two or three rounds of sequential caving,indicating that multiple rounds of caving can make the top-coal sink slowly and evenly and minimize the mixing of roof gangue.According to the simulation results and field operability,it is finally determined that the coal caving method of Huangyuchuan mine is one cutting one caving and two rounds of sequential caving.

  • 关键词

    双向倾斜工作面放顶煤矿压显现冒放性浅埋

  • KeyWords

    two-way inclined working face; top-coal caving; mine pressure behavior law; caving characteristics;shallow baried

  • 基金项目(Foundation)
    国家重点研发计划资助项目(2018YFC0604501);中央高校基本科研业务费资助项目(2021YQNY10,2021YJSNY03)
  • 引用格式
    郭焘,张坤铭.浅埋双向倾斜工作面综放开采矿压显现规律研究[J].煤炭科学技术,2022,50(3):53-60.
    GUO Tao,ZHANG Kunming.Study on ground pressure behavior law of fully-mechanized top-coal caving mining in shallow buried two-way inclined working face[J].Coal Science and Technology,2022,50(3):53-60.
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