浅埋综采面高速推进对周期来压特征的影响  

Influence of high mining velocity on periodic weighting during fully-mechanized mining in a shallow seam

作　　者：王晓振[1] 许家林[1] 朱卫兵[1] 鞠金峰[1] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室矿业工程学院,江苏徐州221116

出　　处：《中国矿业大学学报》2012年第3期349-354,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50974116);国家自然科学基金和神华集团有限公司联合资助项目(51174288);江苏高校优势学科建设工程项目(5ZBF2011-6-B35)

摘　　要：以活鸡兔井为工程背景,通过实测和理论分析就浅埋综采面高速推进对周期来压特征的影响规律进行了深入研究.结果表明:在高速推进情况下(推进速度一般大于10m/d),工作面周期来压持续长度显著增加,而周期来压步距、支架载荷和动载系数的变化相对较小.推进速度差异引起周期来压特征发生变化的实质是围岩变形破坏特征时间效应的体现.工作面高速推进时,直接顶由于推进速度较快垮落不充分,老顶在破断回转过程中需要更大的回转量才能触矸稳定,这是导致来压持续长度明显增加的重要原因.将推进速度对周期来压特征的影响规律运用到了神东矿区双回撤通道综采面末采段的让压开采实践中,指导了活鸡兔井21306综采面的安全回撤.The Huojitu coal mine is used to develop measurements and theoretical analysis relat- ed to periodic weighting during fully-mechanized mining at high velocities in a shallow seam. High mining velocities are shown to increase the continuous length roof weight although the support and dynamic load coefficients are only modestly affected. The time effect on damage deformation in the surrounding rock is the source of roof weighting dependence on mining ve- locity. High velocities exceed the rate of roof collapse, which requires more rotating movement to realize roof stability, consequently increasing the required continuous length weight. The in- fluence of mining velocity on periodic weighting The Shendong practice of removing support the entrance face is discussed. This serves guidance working face located in the Huojitu mine. requirements are used to model mining yields. end of fully-mechanized mining with a double for safe support removal in the number 21306

关 键 词：浅埋煤层 推进速度 来压持续长度 关键层 

分 类 号：TD325[矿业工程—矿井建设]