模拟海洋环境静力触探仪孔压校准方法

Calibration method for pore pressure of CPTU based on simulated ocean environment

为进一步保障海洋静力触探仪孔隙水压力数据的准确和量值的溯源,该文提出一种基于模拟海洋环境的孔隙水压力校准方法。通过开展孔隙水压力的校准实验,获得探头在不同温度条件下各压力校准点处的修正值及修正值的扩展不确定度,实现孔压测量值的准确和溯源。实验结果表明海洋静力触探仪探头工作环境温度偏离标定时的温度越大,孔隙水压力测量示值误差将越大。孔压示值误差随温度的变化趋势验证基于模拟海洋环境对静力触探仪孔隙水压力开展校准的必要性。

In order to further ensure the accuracy and traceability for pore pressure of CPTU,this paper proposes a calibration method for pore pressure of CPTU based on the simulated ocean environment.On this basis,calibration experiment for pore pressure of CPTU is carried out.Through the calibration experiment,the correction value and expanded uncertainty of correction value at each calibration point under different temperature conditions are obtained,and the accuracy and traceability of pore pressure is realized.The result shows that the temperature of working environment for probe deviates from temperature of calibration more greatly,the indicating error of pore pressure is greater.At the same time,the necessity of calibration for pore pressure based on simulated ocean environment is verified by the change trend of indicating error for pore pressure with temperature.