圖11不同煤柱寬度塑性破壞特征
Fig.11Theplasticfracturecharacteristicsof
differentcoalpillarwidths
因此,大煤柱寬28~30m時煤柱沿傾向方向上垂直應(yīng)力先增大后減小,煤柱兩側(cè)均有一定寬度的塑性區(qū),煤柱中間存在彈性核區(qū);當(dāng)煤柱寬度較小時為6~8m時,雖煤柱內(nèi)應(yīng)力不高,但巷道周邊的最大位移區(qū)域主要集中在煤柱幫部,巷道的水平位移遠遠大于大煤柱寬28~30mm的位移,煤柱已經(jīng)被壓垮,幾乎無承載能力,不能保證巷道的穩(wěn)定性,同時,煤柱破壞嚴重,容易導(dǎo)致采空區(qū)漏風(fēng)、殘煤自燃。綜合考慮資源回收、巷道穩(wěn)定性、次生災(zāi)害控制等因素,確定大采高綜放工作面區(qū)段煤柱合理寬度為28m。
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