岩石预应力锚索应力分布模式分析

Analysis of stress distribution model of rock pre-stressed cable

阐述了采用理想弹塑性载荷传递函数,根据拉力型预应力锚索锚固段的受力平衡,利用锚固体、锚索和注浆体共同作用的位移模式,推导出预应力锚索锚固段剪应力和轴力分布函数,得到了预应力锚索极限承载力公式。由此可知,预应力锚索最大极限承载力与锚固段长度无关;并讨论了不同参数对锚固段应力分布的影响。其结果可为预应力锚索的设计和计算提供理论参考,具有一定工程实际意义。

Use the perfect elastic-plastic load-transfer model and the displacement mode of interaction between grout mass,cable and anchorage mass.The article discussed the force balance of anchorage segment,gained the distribution functions of shear stress and axial force of anchorage segment of pre-stressed cable.Also gained the formula about ultimate bearing capacity of pre-stressed cable,the maximum ultimate bearing capacity has no relationship with anchorage length.From this,the influences of different parameters on the stress distribution of the anchorage segment are discussed.The gained significant results can provide theoretical references for design and calculation of the pre-stressed cable.