基于超重力场的土壤剪切波速测量系统

The Measurement System of Soil Shear Wave Velocity Based on the Hypergravity Field

为解决超重力场下,土体剪切波速测量过程中存在的自动化程度低、测量设备价格昂贵等问题,提出一种基于振动传播特性的土壤剪切波速测量方法,设计完成一款高精度、低成本、便携且可实时在线测量的监测仪器。系统采用NI信号输出模块,输出特定的模拟信号,设计功率放大模块对该信号进行功放处理;功放输出信号驱动压电陶瓷单元A振动;振动传递至压电陶瓷单元B后,使其输出特定的电信号,经信号采样模块采集上传至处理器。利用信号模块输出信号与接收信号之间的相位特性,设计算法实现对土体剪切波速的测量和显示。测试结果表明:该仪器可以实现在超重力场下,对土体剪切波速实时在线测量,稳定性高,可操作性强。

In order to solve the problems of low automation and expensive measurement equipment in the process of soil shear wave velocity measurement under high gravity field,a method of soil shear wave velocity measurement based on vibration propagation characteristics was proposed,and a high-precision,low-cost,portable and real-time online measurement monitoring instrument was designed.The system uses Ni signal output module to output a specific analog signal,and designs a power amplifier module to process the signal;the output signal of the power amplifier drives the piezoelectric ceramic unit a to vibrate;after the vibration is transmitted to the piezoelectric ceramic unit B,it outputs the specific electrical signal,which is collected and uploaded to the processor by the signal sampling module.Based on the phase characteristics between the output signal and the received signal,the algorithm is designed to measure and display the shear wave velocity of soil.The test results show that the instrument can realize real-time on-line measurement of soil shear wave velocity in high gravity field,with high stability and strong operability.