采深对采空区下坚硬顶板运动规律影响特征分析
Influencing Characteristic Analysis of Mining Height on Hard Roof Motion Law Under Goaf
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摘要: 为了能够更进一步的确定采深对采空区下工作面的影响，尽可能的避免上、下采空区的贯通，采用了数值模拟的方法研究上覆岩层的离层空间、动压显现特征以及“三带”裂隙高度。结果表明:随着下煤层工作面采深不断增加，在工作面上方顶板岩层中的拉伸破坏单元逐渐的增多，采深的增大加剧了采空区下坚硬顶板的垮落和断裂，同样减小了顶板的断裂步距。随着采深的不断加大，初次来压期间的位移下沉值不断扩大，尤其是向上扩展的高度不断地增大，说明了下煤层工作面采深的增大促进了“上三带”的发展。Abstract: In order to further determine the effect of mining height on working face under goaf, avoid upper and lower mined-out areas running through as far as possible, this paper adopted the method of numerical simulation to research abscission layer of overburden stratum, dynamic pressure characteristics as well as the "three zones" fracture height. Simulation results show that: with the increasing of coal seam working face mining height, the tensile failure unit in roof strata above the working face is gradually increase, the increase of mining height exacerbated the hard roof caving and rupture, also reduced the roof fracture interval. With the increasing of mining height, the displacement sinking value during the first weighting is increasing, especially the scaling up of height continuously increasing, which illustrates that coal seam working face under the increase of mining height will promote "three zones" development .
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Keywords:
- overlying rock /
- hard roof motion law /
- mining height /
- numerical simulation /
- fractured height
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