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用锚喷作永久支护的巷道中,目前大部分采用两掘一喷或一掘一喷的施工方法,紧跟迎头一次支护成巷。这种方法虽能及时封闭围岩、减缓围岩的变形和松动范围,但也存在一些弱点,对于松软岩层的巷道,经过初喷后一段时间,很可能出现喷层裂隙及脱落等不良现象。为确保锚喷支护的可靠性,减少质量事故,根据各地的经验及个人体会,认为在松软岩层将一次支护成巷改为二次支护成巷是比较合适的。
Anchor anchored for permanent support of the roadway, the current most of the use of two dig a spray or a dig a spray of construction methods, followed by a head start into the lane. Although this method can timely close the surrounding rock and slow down the deformation and loose range of the surrounding rock, some weaknesses exist. For the soft rock roadway, after the initial spraying, it is possible for the fracturing and shedding to occur. In order to ensure the reliability of bolting and shotcreting and reduce the quality accident, according to the experience and personal experience of different places, it is more appropriate to change the one supporting lane into the second supporting lane in soft rock formation.