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为掌握土压力传感器置于硬土介质中呈现的非线性响应特性,建立了传感器与土介质的相互作用模型,运用有限元分析了满足匹配误差稳定所需的传感器与土介质的模量比条件。进行了传感器的单体标定和级配碎石土介质标定试验,探讨了传感器非线性响应的主要影响因素。计算与试验表明,目前国内主流的双膜土压力传感器在量测硬土介质中的土压力时,由于模量偏小标定曲线非线性显著;土压力传感器单体标定曲线线性度较高且其模量基本稳定,表明土介质的模量变化是引起标定曲线非线性的主要因素;通过将传感器置于与使用环境相近的土介质中进行标定,并采用非线性修正可明显提高硬土介质中土压力量测的准确性。
In order to grasp the nonlinear response characteristic of earth pressure sensor placed in hard soil, the interaction model between soil sensor and sensor was established. The finite element method was used to analyze the modulus ratio condition of sensor and soil medium . The sensor calibration of monomer and graded gravel soil were carried out. The main influencing factors of sensor nonlinear response were discussed. Computation and tests show that the mainstream bi-film earth pressure sensor in the current measurement of earth pressure in hard medium due to the modulus of small calibration curve of non-linear significant; earth pressure sensor monomer calibration curve of high linearity and its The modulus is basically stable, indicating that the modulus of soil medium is the main factor that causes the non-linearity of calibration curve. By calibrating the sensor in the soil medium with similar environment and using nonlinear correction, Accuracy of soil pressure measurement.