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1.注浆孔的布置作者在波兰新羌煤矿,用预先注入尿醛树脂的方法,解决了通过破碎层的长壁工作面顶板岩层的加固问题。通常加固顶板时,在工作面的前方钻凿注浆孔,或者向垂直直接顶板的主要裂隙钻凿注浆孔。注浆材料以平面放射状向钻孔的周围注入,形成桩形固结体而加固岩层。注浆孔的布置必须确保加固顶板,顶板注浆孔的布置如图1。
1. Layout of Grouting Hole The authors at the Xinjiang New Qiang Coal Mine solved the problem of reinforcement of the roof strata of long-wall working face through the crushed layer by using the method of pre-injecting the urea-formaldehyde resin. When reinforcing the roof, it is common practice to drill a grout hole in front of the work surface or to drill a grout hole to the main fractures of a vertical, direct roof. The grouting material is radially injected into the periphery of the borehole to form a pile-shaped consolidation body and reinforce the rock formation. Grouting hole layout must ensure that the reinforcement of the roof, roof grouting hole layout shown in Figure 1.