大倾角煤层长壁大采高综采支架动态载荷特征分析
Changeful load feature analysis of supports in longwall and large mining height fully-mechanized face of steeply dipping seam
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摘要: 针对大倾角煤层大采高工作面支架受载特征复杂、对工作面围岩稳定性控制影响大等问题。采用现场实测与理论分析相结合方法,研究了大倾角煤层大采高开采过程中,支架瞬态与长时载荷变化规律,结果表明:正常回采阶段与来压期间,工作面循环初期和循环末期支架载荷均呈现出倾斜中部较大、下部次之、上部最小的特征,工作面载荷分区特征更为明显,支架受载不均衡程度表现出后柱大于前柱、循环末期大于循环初期、来压期间大于正常回采阶段;与一般采高大倾角煤层工作面相比,支架受力多变程度明显增加,工作面倾斜上部区域尤为明显,初次来压与周期来压步距均明显减小,来压强度则明显增大,支架阻力整体增加。
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关键词:
- 支架瞬态载荷 /
- “支架-围岩”系统稳定性 /
- 大倾角煤层 /
- 长壁大采高
Abstract: According to the complicated loading state of suppors in large mining height face of steeply dipping seam and affcted the staolity of surrounding rockaround the mining face,the site measurement and theoretical analysis were appied to stucy and summaize change rule of the transient loading and longtime loading .n supports.The results showed that theinitial cycle and end cycle oading valueof suppors in midle area along woring face was bigg r tan thelower an uppr re次during the normal mining process and periodit weighting proc.ss the dietits characer aiong the face became even more obiousthe inbalanceof back hyrauli suppor loading was greater than the front hydrauic support and the same characterstics concluded in the end cyle and ntial cycle,the perodic weighting process and normal mining process.The changeful loading states of suppors were more obvious than in the noral mining heighn face of steeping dpping seamespecall n th upearea of working face.and the ditance of frst weighting and periodic weighting reduced significantly ve ghting intense increased clearyth cading vales f al uppors were markedly increased. -
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