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以地震灾区的震害斜坡为原型搭建锚固工程模型,采用低周往复荷载试验方法,研究预应力锚索在往复荷载作用下的震害特征与变形规律。结果表明:在往复荷载作用下,预应力锚索最先发生破坏且破坏最为严重的是位于模型最上排的锚索,其破坏形式以锚索体自由段根部拉断和外锚头脱落为主,未出现内锚固段黏结力和握裹力失效现象;锚索体应变显著变化的部位集中在锚固段,一处靠近锚固段底部,另一处靠近滑面位置,且尤以靠近滑面处的应变较大;往复荷载比单一的水平推力对锚索的变形影响更大,更容易导致材料的破坏。该成果对地震灾区预应力锚索的健康诊断与震害评估具有一定的参考价值和指导意义。
The anchorage engineering model was built based on the seismic damage slope in the earthquake-stricken area. The low-cycle cyclic loading test method was used to study the seismic damage characteristics and deformation of prestressed anchor cables under cyclic loading. The results show that under the action of reciprocating load, the prestressed anchor cable is the first to destroy and the most destructive is the anchor cable located in the uppermost row of the model. The failure mode is based on the pull-off of the free part of the anchor cable and the drop of the outer anchor head , There is no failure of internal anchoring segment adhesion and bondability failure phenomenon; significant changes in anchor cable body parts concentrated in the anchorage section, one near the bottom of the anchorage section, the other near the slip surface, and especially near the slip surface Of the larger strain; reciprocating load than a single horizontal thrust greater impact on the deformation of the anchor, more likely to lead to material damage. The results have certain reference value and guiding significance for the health diagnosis and earthquake damage assessment of prestressed anchor cable in earthquake-stricken areas.