Bender Elements在测试土样剪切波速中的应用

本文以作者在香港理工大学土木与结构工程系设计制作的一套BenderElements为例，介绍了BenderElements的原理、发展历史、应用范围、使用方法和注意事项等。BenderElements是由压电陶瓷材料制成的，在拉伸、压缩作用下，会产生正、负电荷，反过来，给它施加正、负电荷后，它又可产生弯曲振动，正是利用它的这一特性，将其作成接收和发射装置，来测试土样的剪切波速Vs。BenderElements在安装使用时，防水和静电屏蔽十分关键。Vs可在场地地震反应、液化判别、动力基础设计、检测地基改良效果等方面获得应用。震相识别的原则是接收信号的第一个峰值为到时。

Application of bender elements in measuring shear wave velocity of soil sample

Shear wave velocity (Vs) of soil is one of the key parameters used in the seismic response analysis of soil sites. Such parameter can be experimentally obtained in laboratoryusing the Bender Elements Test, a recently developed test method. This paper describes thebackground of the Bender Elements Test Method, and the respective test setup in The Hong Kong Polytechnic University. With the illustration of some test results, the technique to obtainreliab1e test data, with respect to water-proofing, electrostatic sheltering, and identification of generating receiving signals, is also discussed.