大倾角厚煤层错层位巷道布置支架稳定性控制技术
Control Technology of Support Stability in Thick Seam with Large Dip Angle Split-level Roadway
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摘要: 针对苏杭河矿大倾角厚煤层伪仰斜工作面设备下滑、飞矸、片帮等问题,提出了错层位巷道布置方案。通过建立单个支架稳定性力学模型,分析其失稳机理,得到了支架稳定性判别条件,认为错层位巷道布置起坡段对支架下滑起到关键控制作用,可有效减小支架的下滑趋势,提高支架的稳定性。通过数值模拟分析工作面矿压显现规律,工作面顶板应力释放区与拉伸破坏区呈非对称分布,并且拉伸破坏区与垮落线相对应。结合现场实测对支架适应性进行分析,工作面支架能够满足安全生产的需求,但工作面来压强度不对称,中部矿压显现最强烈,动载系数1.66,上部次之,下部相对平缓。Abstract: The paper proposes the scheme of split-level which is for the problems of downslide of roadway and flying refuse and slice slope in pseudo-inclined working face of thick seam with large dip angle in Suhanghe Coal Mine. The instability mechanism of supports is analyzed by establishing a mechanical model of its stability, and it shows that the slope section plays a key control role in controlling the equipment sliding. It can effectively reduce the sliding trend of the supports and improve the stability of the supports. Through numerical simulation, the law of strata pressure in working face is analyzed. The stress release zone and tensile failure zone of working face roof are asymmetrically distributed, and the tensile failure zone corresponds to the collapse line. Based on the field measurement, the adaptability of the support is analyzed. The support can meet the demand of safe production. The strength of the working face is not symmetrical. The rock pressure in the middle of the working face is the strongest, the dynamic load coefficient is 1.66, followed by the upper part, and the lower part is relatively flat.
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Keywords:
- split-level /
- slope-starting section /
- large inclination /
- thick coal seam /
- support stability
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