浅埋煤层开采顶板切落压架灾害的突变分析-中国矿业大学.PDF

第33 卷 第1 期 采矿与安全工程学报 Vol.33 No.1 2016 年01 月 Journal of Mining Safety Engineering Jan. 2016 文章编号：1673-3363-(2016)01-0122-061 浅埋煤层开采顶板切落压架灾害的突变分析 杨登峰，陈忠辉，洪钦锋，张闪闪 ( 中国矿业大学(北京)力学与建筑工程学院，北京 100083) 摘要 针对浅埋煤层开采周期来压过程中顶板沿煤壁台阶下沉导致顶板切落压架灾害的问题，根 据直接顶岩体在支承压力作用下破坏失稳的非线性变化特征，建立了由基本顶-直接顶-支架-矸石 组成的系统力学模型。利用突变理论研究了荷载作用下系统的失稳机制，获得了系统失稳的充要 条件及直接顶岩体的变形突跳量表达式，分析了系统失稳的主要影响因素。结果表明：直接顶的 失稳破坏，导致了顶板的切落，系统失稳除与支架和直接顶岩体的刚度比及材料参数有关外，还 与所受载荷及基本顶周期来压步距相关。结合工程实例，验证了理论推导的合理性，并给出了工 程建议。 关键词 浅埋煤层；突变理论；直接顶；顶板切落；失稳机理 中图分类号 TD 353 文献标志码 A DOI 10.13545/ki.jmse.2016.01.019 Catastrophic analysis of support crushing disasters while roof cutting in shallow seam mining YANG Dengfeng ，CHEN Zhonghui，HONG Qinfeng ，ZANG Shanshan (School of Mechanics Civil Engineering，China University of Mining Technology (Beijing)，Beijing 100083 ，China) Abstract Aiming at the problem of roof cutting support crushing disasters caused by roof step con- vergence along the coal wall during the periodic weighting in shallow seam mining, based on the nonlinear variation characteristics during unstable failure of immediate roof under the abutment pressure, a system mechanics model composed by the main roof-immediate roof-powered support-waste rock was established. In addition, the instability mechanisms of the system under the loads were studied by catas- trophic theory. The necessary sufficient condition for instability failure of the system and the formula of the jump value of displacement of immediate roof were gained, and the main factors for instability fail- ure of the system were analyzed. The results show that the unstable failure of immediate roof