预应力锚索损伤软化精细有限元模型

›› 2014, Vol. 35 ›› Issue (10): 3013-3020.

预应力锚索损伤软化精细有限元模型

张雄¹，陈胜宏²

1. 中国水电工程顾问集团有限公司，北京 100120；2. 武汉大学水资源与水电工程科学国家重点实验室，武汉 430072

收稿日期:2013-06-22 出版日期:2014-10-11 发布日期:2014-10-27
作者简介:张雄，男，1984年生，博士，工程师，主要从事水工结构数值模拟方面的研究工作。
基金资助:
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)。

Study of prestressed anchor cable by damage softening detailed finite element model

ZHANG Xiong¹，CHEN Sheng-hong²

1. China Hydropower Engineering Consulting Corporation, Beijing 100120, China; 2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China

Received:2013-06-22 Online:2014-10-11 Published:2014-10-27

摘要/Abstract

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。

关键词: 岩土力学, 荷载传递机制, 有限元模型, 预应力锚索

Abstract: Prestressed anchor cable has been widely used as a main reinforcement measure in geotechnical engineering．But the existing calculation method is difficult to reflect the actual situation, such as slip deformation among rock, grout, steel stranded wires. Damage softening concept is introduced by studying characteristics of interface. Damage softening constitutive detailed finite element method is presented to simulate prestressed anchor, and a field test result is compared with calculation result. The most remarkable feature of the algorithm is that it can describe stranded wire, grout, interfaces and other detailed structures. It also can simulate the process of damage softening for interface. The new model can exactly reflect the mechanical change process of the anchoring segment. The test and simulation results are both show that with the load continuous increasing, the interface shear stress peak value of the anchoring segment transfers from the port to inside. The peak value appears at the port when the port is in elastic stage, and the peak value transfers from the port to inside when the port is in damage softening stage. The change law of stress for the anchoring segment of calculation results is basically in accordance with test.

Key words: rock and soil mechanics, load transfer mechanism, FEM model, prestressed anchor cable

中图分类号:

TU 45

张雄，陈胜宏,. 预应力锚索损伤软化精细有限元模型[J]. , 2014, 35(10): 3013-3020.

ZHANG Xiong ，CHEN Sheng-hong,. Study of prestressed anchor cable by damage softening detailed finite element model [J]. , 2014, 35(10): 3013-3020.

参考文献

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