离心力场中微型土压力传感器非线性响应分析

为掌握离心力场环境下微型土压力传感器与土介质相互作用引起的匹配误差特性,结合匹配误差理论,通过液体标定试验和离心力场中土介质标定试验,讨论了微型土压力传感器在模量相对较大土介质中的非线性响应特征及其主要影响因素。试验分析表明:在液压条件下微型土压力传感器具有良好的线性响应特性;在离心力场环境中微型土压力传感器表现出的显著非线性响应特性是由加载过程中土介质模量的改变引起;基于建立的匹配误差随土介质模量变化的关系曲线对测试数据进行非线性修正,可明显提高微型土压力传感器在模量相对较大土介质中的测试精度。

Study of nonlinear response of miniature earth pressure transducer in centrifugal force field

Matching error can come from the interaction between earth pressure transducer and soil in centrifugal field. To grasp it, characteristics of nonlinear response and main affect factors in high modulus soil are examined with the tests of liquid calibration and the tests of calibration for soil in centrifugal field with the matching error theory. Test results show that the calibration for liquid indicates that the response of the miniature earth pressure transducer is highly linear. The calibration for soil in centrifugal field indicates that the significant nonlinear response of the miniature earth pressure transducer is caused by the change of soil modulus in the loading process. Nonlinear correction of test data with the nonlinear expression can significantly improve the accuracy of the miniature earth pressure transducer in high modulus soil. The nonlinear expression is established between the matching error and the modulus of soil.