| 刘钢,罗强*,张良,张立祥.基于环圈仪的土压力传感器标定技术分析[J].实验力学,2018,33(4):567~576 |
| 基于环圈仪的土压力传感器标定技术分析 |
| Analysis of earth pressure transducer calibration technique based on ring-loop instrument |
| 投稿时间：2017-03-25 修订日期：2017-06-14 |
| DOI：10.7520/1001-4888-17-074 |
| 中文关键词: 土压力传感器 环圈仪 标定技术 有限元计算 侧壁摩擦 |
| 英文关键词:earth pressure transducer ring-loop instrument calibration technique finite element calculation lateral wall friction |
| 基金项目:国家自然科学基金(51408491)、国家973计划课题(2013CB036204)、四川省教育厅重点项目(16206471)资助 |
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| 中文摘要: |
| 合理地进行土压力传感器标定是提高土压力测试精度的基本保证，环圈仪由于克服了侧壁摩擦的影响，被认为是一种良好的标定设备。运用有限元分析，探讨了环圈仪侧壁与土介质摩擦接触条件、加载板与土介质表面的不均匀接触状态、土压力传感器与土介质的刚度不匹配等因素对环圈仪内土介质应力场分布特征的影响。基于环圈侧壁和加载板等边界条件与土压力传感器本身引起的土介质应力场变化范围互不叠加的原则，提出了环圈仪直径和高度的确定方法。通过试验对环圈仪减小侧壁摩擦的效果进行了验证，利用环圈仪进行标定试验得到的匹配误差与理论计算结果吻合很好，验证了环圈仪标定土压力传感器技术的可靠性。 |
| 英文摘要: |
| Reasonable calibration of earth pressure transducer is the basic guarantee to improve the precision of earth pressure measurement. Ring-loop instrument is considered as good calibration equipment due to it overcomes the effect of lateral wall friction. By using finite element analysis, the influence of the friction contact condition between lateral wall and earth medium, the influence of the non-uniform contact state between loading plate and earth medium surface, and the influence of the stiffness mismatch between earth pressure transducer and earth medium on the distribution characteristics of earth medium stress field in ring-loop instrument were discussed. Based on the principle that the variation range of earth medium stress field caused by boundary condition between ring-loop lateral wall and loading plate are not superposed with the variation range of earth medium stress field caused by earth pressure transducer itself, a method for determining the diameter and height of ring-loop gauge was proposed. The effect of ring-loop instrument to reduce the lateral wall friction is verified through experiment. The matching error obtained from the calibration experiment with the ring-loop instrument is in good agreement with the theoretically calculated result, which verifies the reliability of the earth pressure transducer calibrated by ring-loop instrument. |
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