开切眼是指沿采煤工作面始采线掘进，在运输巷和回风巷之间顺煤层掘进一条巷道，使其形成一套独立的回风系统，回风系统形成后才能布置采面采煤一片煤。
以往开切眼的支护一般为木棚，使开切眼的空间狭小，对于安装设备的效率和安全有很大影响。
In the past, the supporting of open-off cut used to be log shed. Since the space is limited, the facilities fixing efficiency and safety are influenced greatly.
工业试验表明：开切眼巷道使用改进后的锚杆支护，有利于工作面安全生产，且能降低支护成本。
Commercial tests indicate that adopting the improved bolts are good for safety in production and can reduce support cost.
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