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人们普遍认为,水泥砂浆锚索是沿钢绳—胶结料界面而不是沿胶结料—岩石界面破坏,而且还认为锚索的性态和摩擦式支护系统一样。这意味着锚索的拔出力主要取决于胶结料对钢绳施加的径向压力,因而取决于围岩对胶结料的约束。当扭转的钢绳从钻孔中拔出或试图脱离岩石时,由于钢绳迫使胶结料膨胀(径向扩张)而产生这种径向压力。因此,拔出力或锚索的锚固力直接与钢绳—胶结料界面上的径向压力有关。
It is generally accepted that cement mortar anchors are destroyed along the wire rope-cement interface rather than along the cement-rock interface, and the behavior of the anchor cable is also considered to be the same as that of the friction support system. This means that the pull-out force of the anchor cable depends mainly on the radial pressure exerted by the cement on the steel cord and therefore on the binding of the surrounding rock to the binder. This radial pressure occurs when the twisted steel cord is pulled out of the borehole or tries to break away from the rock as the steel cord forces the cementitious material to expand (radially expand). Therefore, the pull-out force or anchorage force of the cable is directly related to the radial pressure on the wire-cement interface.