桿柱最大的特点,就是安装以后可以产生较大的预加应力,而其它木材、金属以及混凝土支柱都没有这一条件,虽然也有些顶加应力但比较桿柱为小。当掘进巷道以后,岩石的平衡被破坏,在这种情况下安装桿柱,便产生了预加应力,岩石在新外力作用下,产生了新的平衡,结果在巷道顶板可以不呈现地压。所以桿柱的作用,一方面是预防地压,一方面是加固岩石本身的强度。 The greatest feature of the mast is that it can produce a large prestressing force after installation, while other wood, metal and concrete pillars do not have this condition, although some are stress at the top but the posts are smaller. After tunneling, the balance of the rock is destroyed. In this case, the pole is installed and a prestressing force is generated. Under the new external force, the rock creates a new balance. As a result, no pressure can be applied to the roof of the roadway. Therefore, the role of the pole, on the one hand is to prevent ground pressure, on the one hand is to strengthen the strength of the rock itself.