大倾角煤层采动裂隙演化规律

发布时间：2018-06-23 10:24

本文选题：大倾角煤层 + 裂隙　；参考：《煤炭学报》2017年08期

【摘要】：通过离散元UDEC数值模拟计算,分析了大倾角煤层开采过程中,扰动岩体裂隙的演化规律,同时采用相似材料模拟实验结果验证了数值计算结果的可靠性。大倾角煤层采动岩体裂隙发展初期以平行于工作面倾向的离层裂隙为主,后期离层裂隙的高度基本恒定,竖向裂隙扩展加速,直至延伸到地表,形成错断式裂缝和塌陷坑。在此基础上,建立了大倾角煤层采动裂隙分形维数D和采深的关系式,以及逾渗概率p和采深的关系式,实现了定量描述裂隙的演化规律。通过拟合分形维数D和逾渗概率p的关系式,可求得分形维数的峰值,进而可求得对应的采深,此采深即为破碎覆岩压密沿倾斜方向重新形成稳定结构所需的采深。计算结果可用于预先估算大倾角煤层开采埋深范围内是否可形成基本顶稳定结构,进而可采取不同的措施指导工作面的安全开采以及巷道的合理支护。
[Abstract]:Through the numerical simulation of discrete element UDEC, the evolution law of disturbed rock fissure in the mining process of large dip coal seam is analyzed, and the reliability of the numerical calculation result is verified by the simulation results of similar materials. In the early stage of the development of rock mass fissures in large inclined coal seam, the main fracture is the fracture parallel to the working face, the height of the fracture in the later stage is basically constant, and the vertical crack extension accelerates up to the surface to form the dislocation fracture and collapse pit. On this basis, the relationship between the fractal dimension D of mining fracture and mining depth and the relation between percolation probability p and mining depth in large dip coal seam are established, and the evolution law of fracture is quantitatively described. By fitting the relationship between fractal dimension D and percolation probability p, the peak value of fractal dimension can be obtained and the corresponding mining depth can be obtained. The calculation results can be used to estimate whether the basic roof stability structure can be formed in the mining depth of large inclined coal seam in advance, and then different measures can be taken to guide the safe mining of the working face and the reasonable support of the roadway.
【作者单位】：北京航空航天大学交通科学与工程学院;
【基金】：国家自然科学基金资助项目(41302273)
【分类号】：TD823.21

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