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为了提高喷射混凝土支护的承载能力、增加锚喷支护的可靠性,井下采取加厚喷层的办法。但根据西安矿院研究的结果表明,
In order to increase the bearing capacity of the shotcrete support and increase the reliability of the anchor and shot support, the method of thickening the spray layer was adopted downhole. However, according to the results of studies in Xi’an Coal Mine,