为探究浅埋薄基岩超长工作面液压支架群组的承载特性,构建了工作面煤壁-支架-顶板的弹性基础梁力学模型,研究了7种因素对支架阻力的影响。理论计算与实测结果吻合良好。研究结果表明:支架工作阻力呈单峰值与“M”形三峰值两种分布形式;工作面长度、基本顶厚度和弹性模量影响支架阻力分布曲线形状和高阻力范围;采高和上覆岩层载荷影响曲线值;支架刚度影响高阻力范围;巷帮刚度影响靠近巷道侧的支架阻力。基于此,提出了包括确定适当面长、支架分区调控、煤壁协同控制、巷帮主动强化等手段在内的浅埋薄基岩超长工作面关键安全管控措施。研究成果可为浅埋薄基岩超长工作面支架阻力设计与灾害预防提供理论依据。

For the backfill hydraulic support as the key equipment for achieving integration of backfilling and coal mining simultaneously in the practical process, its characteristics will directly influence the backfill body's compression ratio. Horizontal roof gap, as a key parameter of backfilling characteristics, may impact the backfilling effect from the aspects of control of roof subsidence in advance, support stress, backfilling process and the support design. Firstly, the reason why Horizontal roof gap exists was analyzed and its definition, causes and connotation were introduced, then adopting the Pro/E 3D simulation software, three typical 3D entity models of backfill hydraulic supports were built, based on the influence of Horizontal roof gap on backfilling effect, and influence rules of four factors, i.e. support height, suspension height, suspension angle and tamping angle, were emphatically analyzed on Horizontal roof gap. The results indicate that, the four factors all have sign...

为探究浅埋薄基岩超长工作面液压支架群组的承载特性,构建了工作面煤壁-支架-顶板的弹性基础梁力学模型,研究了7种因素对支架阻力的影响。理论计算与实测结果吻合良好。研究结果表明:支架工作阻力呈单峰值与“M”形三峰值两种分布形式;工作面长度、基本顶厚度和弹性模量影响支架阻力分布曲线形状和高阻力范围;采高和上覆岩层载荷影响曲线值;支架刚度影响高阻力范围;巷帮刚度影响靠近巷道侧的支架阻力。基于此,提出了包括确定适当面长、支架分区调控、煤壁协同控制、巷帮主动强化等手段在内的浅埋薄基岩超长工作面关键安全管控措施。研究成果可为浅埋薄基岩超长工作面支架阻力设计与灾害预防提供理论依据。

为了评价充填采煤液压支架的结构设计,提出了一种基于层次分析法(AHP)、熵权法(EWM)和CRITIC三者综合赋权的TOPSIS评价方法。从结构特性、夯实特性、支护特性和充填特性4个方面确定了8项评价指标,构建了充填采煤液压支架评价体系。融合主客观赋权方法,主观上采用AHP赋权,客观上基于仿真模型采用EWM和CRITIC赋权,建立了AEC-TOPSIS综合评价模型,通过计算各支护状态的相对贴近度分析出优良支护区间。以某四柱充填采煤液压支架为例,该液压支架的优良贴合度为2.4%~2.9%,优良支护区间为3.75~4.80 m,与其服务的煤层厚度相吻合,说明在该煤层进行固体充填开采时可发挥该支架最均衡的性能,为充填采煤液压支架结构设计提供了一种可靠的评价体系与方法。