一种基桩承载力试验中的位移测试方法

发布时间：2018-06-10 20:08

本文选题：桩基础 + 承载力试验　；参考：《桥梁建设》2017年04期

【摘要】：为改善目前基桩承载力试验中位移测试方法的经济性和便捷性,以既有连通管原理为基础,提出差压连通管式位移测试方法,建立测点位移与差压连通管内压差的变化量的关系,从而通过测量半封闭式连通管两端液体表面处的气压差变化实现对基桩试验时竖向位移的测量。结合实际工作要求,研发该方法的位移测量设备,并通过与步进电机控制式移动平台及百分表对应的测试试验验证了该方法的准确性。将该方法应用于某大桥自平衡法试桩工程中,结果表明:(1)测试期间无需基准梁,无安装垂直度要求,可降低试验成本;(2)与电子位移传感器测量结果一致,最大差值0.24mm,说明应用该方法进行基桩承载力试验中的位移测量具有较好的经济性和可行性。
[Abstract]:In order to improve the economy and convenience of the displacement measurement method in the bearing capacity test of foundation pile, a differential pressure connected pipe displacement test method is proposed based on the principle of existing connected pipe. The relationship between the displacement of the measuring point and the variation of the pressure difference in the differential pressure connected pipe is established, and the vertical displacement of the foundation pile is measured by measuring the variation of the gas pressure difference at the liquid surface at the two ends of the semi-closed connected pipe. According to the practical requirements, the displacement measurement equipment of this method is developed, and the accuracy of the method is verified by the test results corresponding to the stepping motor control mobile platform and the percentile. The application of this method to the test pile engineering of a certain bridge with self-balancing method shows that during the testing period, no reference beam is required and the test cost can be reduced by using the method without the requirement of installation perpendicularity. The results are in agreement with the results obtained by the electronic displacement sensor. The maximum difference is 0.24mm, which shows that the method is economical and feasible for the displacement measurement of pile bearing capacity test.
【作者单位】：重庆交通大学;中铁大桥科学研究院有限公司;
【基金】：国家重点基础研究发展计划(973)项目(2012CB723305) 中央高校基本科研业务费专项资金项目(310821161120)~~
【分类号】：TU473.16

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