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预应力锚索作为岩土工程的一种主要加固技术已得到日益广泛的应用,但现有的计算方法难以反映岩体、砂浆、钢绞线相互之间的滑移变形等实际情况,计算结果难以体现实际的加固效果。通过研究接触面的特性引入损伤软化概念,建立了包含钢绞线、砂浆、接触面的损伤软化精细有限元模型,并与现场试验进行了对比分析。该模型优点是精细地描述了钢绞线、砂浆和接触面等结构的力学行为,可以反映接触面力学材料损伤软化的过程,更加精确地反映了锚固段的力学变化过程。试验结果对比显示,两者随着荷载不断加大,锚固段接触面上的剪应力峰值由端口往里转移。当端口处于弹性阶段,峰值在端口,呈指数衰减模式;当端口处出现损伤软化,峰值往里转移。计算分析反映的锚固段应力变化规律与试验基本一致。
As a kind of main reinforcement technology of geotechnical engineering, prestressed anchor cable has been widely used, but the existing calculation method is difficult to reflect the actual situation of rock mass, mortar, strand deformation between the strands, the calculation results Difficult to reflect the actual reinforcement effect. By studying the characteristics of contact surface, the concept of damage softening is introduced. A detailed damage softening finite element model including strand, mortar and contact surface is established and compared with the field test. The advantage of this model is that it describes the mechanical behavior of the structure such as steel strand, mortar and contact surface delicately, which can reflect the process of softening and softening of the interface mechanics material and reflect the mechanical change process of the anchorage segment more accurately. The comparison of test results shows that with the increasing load, the peak shear stress on the contact surface of the anchorage section is transferred from the port to the port. When the port is in an elastic phase, the peak is at the port, exponentially decaying mode; when the port is softened and softened, the peak is shifted inward. The variation of stress in anchorage section reflected by calculation and analysis is basically consistent with the experiment.