State Power Construction Investment Inner Mongolia Energy Co. , Ltd.
School of Mines, China University of Mining and Technology

长壁综采工作面的矿压强度分析与有效监测对于保障工作面开采的稳定和安全具有重要意义。基于察哈素31319工作面顶板条件,确定了工作面矿压显现具体指标,计算得到了工作面基本顶载荷和工作面初次及周期来压步距;建立了基本顶力学承载模型,开展了顶板稳定性分析,结合顶板离层条件分析出了31319工作面顶板属易离层条件;采用了弹性地基梁理论,建立了采场分区承载模型,将采场简化为原岩Ⅰ区、支架支撑Ⅱ区、采空基本顶未触矸Ⅲ区和采空垮落Ⅳ区,得到了工作面基本顶力学挠度、转角、弯矩、剪力等力学参数在不同开采阶段的变化特征:不同载荷下基本顶的挠曲线图像呈开口向下的抛物线式变化,转角整体呈“S”形变化,弯矩呈开口向上的抛物线形式变化,剪力呈线性变化。结合理论分析结果,提出了31319综采面矿压监测内容以及测点布置方法。该研究成果可为工作面顶板灾害防治与煤矿安全高效开采奠定关键基础。

The strength analysis and effective monitoring of mining pressure in longwall fully mechanized mining face are of great significance to ensure the stability and safety of the mining face. Based on the roof conditions of Chahasu No. 31319 working face, the specific indicators of mine pressure of working face are determined, and the basic roof load of the working face and the initial and periodic weighting interval of the working face are calculated; the basic roof mechanical bearing model is established, the roof stability analysis is carried out, and the roof of No. 31319 working face is analyzed in combination with roof separation conditions; the mining filed partition bearing model is established by using the elastic foundation beam theory. The mining filed is simplified into original rock Ⅰ zone, support Ⅱ zone, basic roof indirect-gangue Ⅲ zone and goaf collapse IV zone. The variation characteristics of mechanical parameters such as mechanical deflection, rotation angle, bending moment, shear force and other mechanical parameters of the basic roof at working face in different mining stages are obtained: the deflection curve image of the basic roof under different loads shows a downward parabolic change, and the overall change of the rotation angle is an “S” shape, the bending moment has an upward parabolic change, and the shear force changes linearly. Combining with the theoretical analysis results, the monitoring outcome of mine pressure in No. 31319 fully mechanized mining face and the layout method of measuring points are proposed. The research results build a key foundation for prevention and control of roof disasters at working face and coal mine safe and efficient mining.

郑金城,田灵涛,李懿,等.浅埋综采工作面复合顶板稳定性研究与监测关键技术[J].煤炭工程,2024,56(12):46-54.