边坡预应力锚杆蠕变的数值分析

运用非线性蠕变分析理论模型,采用MSC.MARC软件重点研究了锚杆的应力指数、蠕变系数和几何参数的变化对于锚杆应力松弛的影响.通过对预应力锚杆支护的边坡进行数值分析,探讨了锚杆的蠕变规律以及锚杆预应力松弛现象.锚杆的参数取不同数值时,比较数值模拟结果发现:锚杆的轴力和剪力主要分布在锚固段的前端;随着锚杆应力指数及蠕变系数的增加,蠕变应变增大,应力松弛加快.

Numerical Analyses of Creep Behavior for Prestressed Anchor Rods

The non-linear creep model will be used to study the influence of stress exponent,creep coefficient and geometry parameter on the stress relaxation of the anchor rods.By the numerical analyses that prestressed anchor rods reinforce the slope,the rule of creep behavior and the stress relaxation of anchor rods will be discussed.Comparing the results of numerical analyses under the different value of parameters,it will be found that the axial force and shearing force mainly distribute on the front of the anchor rod and with the increase of stress exponent and creep coefficient,the creep strain will be enlarged and the stress relaxation will be accelerated.