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用压力盒测试土中动态力时,其误差主要由静态误差、动态误差(频响)、静力匹配误差[5]、安装误差及动力匹配误差组成。前三利误差无论在理论上及试验上均已解决。安装误差可通过安装技术的改进来克服。动力匹配误差山于涉及上中应力波遇障碍后发生反射、绕流、卸载等一系列二维波动现象.致使力学分析非常复杂。现阶段精确的理论解尚难实现。为了检验传感器精度,在试验设备上要求造就一个已知上中某点精确的压力时曲线的一维土中压缩波场,这在目前亦较闲难。因而,当使用土压力传感器测试土中动态力时,对
When using the pressure box to test the dynamic force in soil, the error mainly consists of static error, dynamic error (frequency response), static matching error [5], installation error and dynamic matching error. The former three-profit error has been solved theoretically and experimentally. Installation errors can be overcome by improvements in installation techniques. The power matching error occurs in a series of two-dimensional wave phenomena such as reflection, flow, and unloading after the upper-middle stress wave encounters an obstacle, resulting in a very complicated mechanical analysis. The exact theoretical solution at this stage is still difficult to achieve. In order to test the accuracy of the sensor, it is required to create a one-dimensional compressive wave field in a soil that is known to have a precise pressure curve at a certain point in the test equipment, which is also more difficult at present. Thus, when using earth pressure sensors to test the dynamic forces in soil,