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浅埋深煤层开采沉陷预测方法应用及研究

Application and research on prediction method for mining subsidence inshallow buried deep coal seam

  • 摘要: 煤炭资源开采引起的地表沉陷问题一直是绿色开采亟待解决的关键技术问题之一。为了弄清近浅埋条件下工作面回采覆岩垮断及地表沉陷规律,以店坪煤矿5号煤层开采面临的实际问题为研究背景,采用理论计算、数值模拟与现场实测相结合的方法,对5-210工作面回采条件下地表沉陷规律及其对地表保护区内建筑物的影响进行研究。基于采空区岩体应力-碎胀系数关系和开采沉陷基本原理,建立了地表下沉移动轨迹模型,理论预测工作面开采后的地表下沉规律,其最大下沉量为2.604 m。利用FLAC3D数值模拟软件,建立了工作面回采地表沉陷数值计算模型,并利用Tecplot软件进行模拟结果的后期处理,模拟得出的地表沉陷最大值为2.78 m,最大下沉位于点位于工作面中心位置。依据地表沉陷控制基准,利用几何关系计算得出地表沉陷影响范围及工作面布置的合理边界,将5-210工作面布置在+830 m水平南翼,西与830南翼皮带巷相通,东至井田边界。并对回采期间地表运移沉陷规律进行了现场实测,利用GPS接收机进行RTK实时动态观测收集数据,监测结果显示,地表最大下沉量2.69 m,采空区地表沉陷区域没有影响工业广场上的建筑物的安全。基于理论计算和数值模拟相结合的方法,设计了5-210工作面合理位置和空间布局,取得了良好的实践效果,为类似地质条件的采空区地表沉陷预测提供了可靠的依据。

     

    Abstract: The problem of surface subsidence caused by coal mining has always been one of the key technical problems to be solved urgently. In order to clarify the law of overburden strata and surface subsidence of the working face under the condition of shallow buried strata, the practical problems faced by No. 5 coal seam mining were taken as the research background, the combination of theoretical calculation, numerical simulation and field measurement were used to research the laws of surface subsidence rule and its influence on surface buildings protected areas in No.5-210 mining face and its influence on the buildings in the surface protection area were studied.Based on the relationship between the stress-swelling coefficient of the rock mass and the basic principle of mining subsidence,the surface subsidencemodel was established, and the surface subsidence law after mining was predicted theoretically, with the maximum subsidence of 2.604 m.Using FLAC3D numerical simulation software, the numerical calculation model of surface subsidence in the working face was established, and and the post-processing of simulation results is carried out by Tecplot software.The simulated maximum surface subsidence was 2.78 m,and the maximum subsidence point was located at the center of the working face. According to the ground surface subsidence control benchmark, the geometrical relationship is used to calculate the influence range of the surface subsidence and the reasonable boundary of the working surface layout.The No.5-210 working face was arranged at the southwing of +830 m working level in the mine field, andit is connected with the belt entry in the south of 830 level in the west and reaches the boundary of the mine field in the east. In addition, the field measurement of surface movement and subsidence during mining was carried out, and the GPS receiver was used to collect real-time RTK data. The monitoring results showed that the maximum surface subsidence was 2.69 m, and the surface subsidence area in the gob did not affect the safety of the buildings in the industrial square. Based on the combination of theoretical calculation and numerical simulation, the reasonable position and spatial layout of No.5-210 working face were designed, and good practical results were obtained, which provides a reliable basis for predicting surface subsidence of gob under similar geological conditions.

     

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