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锚索测力计在预应力锚索加固挡墙监测中的应用

, PP. 52-58

Keywords: 道路工程,预应力锚索,原位测试,锚索测力计,预应力损失,加固挡墙

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Abstract:

由于岩土体本身的复杂性,岩土预应力锚固的监测影响因素和评价也比较复杂。通过一个预应力锚索加固挡墙的工程实例,采用锚索测力计进行预应力锚索的应力损失监测,通过详细的监测数据,分析了油压千斤顶和锚索测力计的工作相关性,锚索锚固的瞬间预应力损失及其影响因素,锚索的长期预应力损失及其影响因素,孔隙水压力和气温对锚索测力计测值的影响,测力计监测值对于施工和设计的指导意义等。明确了依托项目锚索锁定过程中瞬间预应力损失率为2.5%~3.6%。张拉锁定的速度快慢对于瞬间预应力损失没大的影响。温度对于锚索测力计的影响从工程应用角度来看可以忽略不计。孔隙水压力可导致监测力起伏。锚固锁定初期预应力损失较大,一般在锁定后的60d左右,预应力基本开始趋向稳定。锚索预应力超张拉10%可以达到预期效果等。对于类似重要工程具有借鉴和指导意义。

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