Pull-out tests on anchoring force of prestressed anchor cables
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摘要: 以某高速公路边坡锚索为例，介绍了已切割钢绞线的既有锚固工程锚索实现再次张拉试验获得锚索设计力学参数的试验方法、操作步骤以及锚索失效准则，对获得的试验数据及在役边坡锚固工程锚索张拉破坏的几种情况分类进行了分析计算，说明了利用现场拉拔试验成果确定预应力锚索有关地层设计参数的方法，并对不同地层预应力锚索张拉破坏时的极限抗拔力进行了比较，对每孔锚索实际自由端伸长量与理论伸长量进行对比分析，系统分析了影响预应力锚索张拉变形破坏的各项因素，得出了一些类似预应力锚索工程设计、施工可以借鉴的结论。Abstract: A highway slope anchor is taken as an example. The methods failure criteria and procedures of the existing anchoring construction anchors are intredused. The experimental process and the acquired experimental data in the practical project are offered. The achieved experimental data and several cases of a serving anchoring project anchor stretch-draw damage are analyzed and calculated. It illustrates how to use field drawing experimental results to determine the design parameters of the relevant strata prestressed anchors. The ultimate pullout capacity of different prestressed anchors are compared. The pratical free end elongation and theoretical elongation of anchors are compared and analyzed. The factors which affects tension deformation and damage of prestressed anchors are discussed combining with the test process of a practical project. Finally, some conclusions are drawn.
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Keywords:
- prestressed anchor cable /
- anchoring force /
- pull-out test
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