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为分析预应力锚索的摩阻力对锚索支护效果的影响程度和影响因素,利用一种让压器的恒阻让压特性,对锚索的摩阻力进行测试。试验结果显示,锚索摩阻力达到孔口张拉力的25%~40%,严重影响锚索的支护效果。通过不同长度锚索的对比试验发现,摩阻力的大小与锚索长度呈加速增加的趋势,且锚索钢绞线的顺直程度是影响摩阻力大小的主要因素。
In order to analyze the influence degree and influencing factors of frictional resistance of prestressed anchor cable on the supporting effect of anchor cable, the frictional resistance of the anchor cable is tested by using a constant pressure letting pressure characteristic of the pressure stabilizer. The test results show that the friction resistance of the anchor cable reaches 25% ~ 40% of the tensile force of the orifice, which seriously affects the support effect of the anchor cable. Through the comparison test of different lengths of anchor cable, it is found that the size of the friction resistance and the length of the anchor cable tend to increase rapidly, and the straightness of the strand of the anchor cable is the main factor affecting the friction resistance.