预应力锚索损伤软化精细有限元模型

发布时间：2018-08-21 08:24

【摘要】：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。
[Abstract]:As a main reinforcement technique in geotechnical engineering, prestressed anchor cable has been widely used, but the existing calculation methods can hardly reflect the sliding deformation between rock mass, mortar and steel strand, etc. The calculation results are difficult to reflect the actual reinforcement effect. The concept of damage softening is introduced by studying the characteristics of contact surface, and the fine finite element model of damage softening including steel strand, mortar and contact surface is established, and compared with field test. The advantage of the model is that the mechanical behavior of the structure such as steel strand mortar and contact surface is described finely which can reflect the damage softening process of the contact surface mechanical material and the mechanical change process of the anchoring section more accurately. The experimental results show that the peak shear stress on the contact surface of the Anchorage section is transferred from the port to the inward with the increasing of the load. When the port is in the elastic stage, the peak value is in the port, showing exponential attenuation mode, and when the damage softens at the port, the peak value moves inward. The stress variation of the Anchorage section reflected by the calculation and analysis is basically consistent with the test.
【作者单位】：中国水电工程顾问集团有限公司;武汉大学
【基金】：国家自然科学基金(No.51079109) 武汉大学博士研究生科研自主基金项目(No.20102060101000058)
【分类号】：TU452

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