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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。
In order to grasp the matching error characteristic caused by the interaction between the micro-earth pressure sensor and the soil medium in the centrifugal force field environment, and by the matching error theory, the calibration of the soil medium in the centrifugal force field and the liquid calibration test is discussed. Nonlinear Response Characteristics and Its Main Influencing Factors in Large Soil Media. The experimental results show that the micro-pressure sensor has good linear response under hydraulic conditions. The remarkable nonlinear response of micro-pressure sensor in the centrifugal field is caused by the change of the medium modulus during the loading. The established matching error with the change of soil modulus curve of the nonlinear correction of the test data can significantly improve the micro-earth pressure sensor in the soil of relatively large modulus test accuracy.