摘要
在开采松散表土坚硬薄基岩浅埋煤层过程中,为避免发生压架、溃沙事故,现场常采取强制放顶的方法,但对于强制放顶距如何合理确定则显得理论依据不足。为此,结合凉水井煤矿首采工作面的实际条件,根据岩层控制理论,采用理论分析、数值模拟、现场观测的方法对合理强制放顶距进行研究。结果表明,在工作面推进距离距切眼20m处,即介于基本顶周期来压步距和初次来压步距之间,进行顶板强制放顶能成功地避免初次来压,对支架影响较小,放顶效果良好,可以避免压架的发生。结论在现场试验中得到了验证。
During mining of shallow-buried seam with loose topsoil and hard and thin bedrock, in order to avoid support break-off and sand inrush happening, forced caving is often adopted in practical engineering in order to avoid support break-off and sand inrush happening. But how to determine the reasonable forced caving interval lacks rational basis. Combining the practical condition of Liangshuijing coal mine, according to rock strata control theory, the reasonable forced caving interval is studied by using methods of theoretical analysis, numerical simulation and in-situ measuring. The results indicate that when the working face advances 20 m far away from cut-hole, namely, between the periodic weighting step distance and first weighting step distance of basic roof, forced roof caving can successfully avoid first weighting, which has less influence on supports and can also avoid support break-off. The conclusions have been proved successfully by in-situ experiment.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第2期388-393,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(50504014)
关键词
采矿工程
薄基岩
浅埋煤层
强制放顶距
数值模拟
mining engineering
thin bedrock
shallow-buried seam
forced caving interval
numerical simulation
