弯曲元试验高精度测试土样剪切波速方法

在HX-100型多功能三轴仪上开发了压电陶瓷弯曲元剪切波速测试系统,研究了高精度测试不同种类和刚度土样剪切波速的方法以及剪切波速弥散性问题,并将弯曲元测试结果与DrnevichLong-Tor型共振柱试验结果进行了对比。研究结果表明,对不同种类和刚度的土样,通过选用合适的激发波形和频率就可以消除接收波形的近场效应和过冲现象,高精度地确定土样剪切波速和极小应变剪切模量;在所使用的激发频率范围内,剪切波速不具弥散性。

Method for precisely determining shear wave velocity of soil from bender element tests

The piezoceramic bender element system for determining shear wave velocity was developed in the HX 100 static/dynamic triaxial apparatus. The method for precisely determining shear wave velocity of soil from bender element tests was studied,and the dispersion of shear wave velocity was investigated.The values of shear wave velocity from bender element tests were compared with those of resonant column tests in Drnevich Long Tor apparatus. It is concluded that the near field effect and overshooting during the bender element tests can be eliminated by using suitable wave and rational frequency of input signals, and the values of shear wave velocity and the very small strain shear modulus can be precisely determined. It is also concluded that the values of shear wave velocity from the bender element tests do not vary with frequencies of input signals.