堤基管涌破坏过程中的声发射信号特性研究  

Research on Acoustic Emission Signal Characteristic in Failure Process of Levee Piping

作　　者：明攀 陆俊[1] 胡少伟[1] 王强[2] 范向前[1] 

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]河海大学力学与材料学院,江苏南京210098

出　　处：《水电能源科学》2018年第2期176-179,共4页Water Resources and Power

基　　金：国家重点研发计划(2016YFC0401902);国家自然科学基金项目(51579153;51409162;51679150);中央级公益性科研院所基本科研业务费专项资金(Y416003)

摘　　要：通过自行设计砂槽模型,开展了堤基管涌连续破坏的室内试验,研究了堤基管涌连续破坏过程中的声发射信号特性。通过对比分析管涌连续破坏过程中测压管水头的变化与声发射特性参数,发现管涌连续破坏过程中有明显的破坏阶段性,可分为未发生管涌、管涌发生初期、管涌发生后期3个阶段。通过分析管涌连续破坏各个阶段声发射信号的波形,发现堤基管涌连续破坏过程的声发射信号多为突发型信号。利用二进离散小波包对声发射信号进行频谱分析,发现管涌连续破坏各个阶段的声发射信号主频主要集中在[0 62.5]kHz频带,管涌发生初期和管涌发生后期的声发射信号主频范围为20~30kHz,未发生管涌阶段则主频偏小为2~7kHz。In order to study the characteristics of acoustic emission signal in the continuous failure process of dike foundation piping, piping indoor tests of dike foundations were carried out within a self-designed sand box model. By comparing the change of the piezometric tube head with the acoustic emission characteristic parameters in the continuous failure process, there are obvious failure stages： no piping, the occurrence of piping and the development of piping. The waveform analysis of acoustic emission signals shows that the acoustic emission signals are burst signals. By analyzing the spectrum of the acoustic emission signals with binary discrete wavelet packet, it is found that the acoustic emission signals are mainly concentrated in the [0,62.5] kHz frequency band. The occurrence of piping and the piping development stage acoustic emission signals frequency are in the range of 20-30 kHz, and the piping failure acoustic emission signals frequen- cy is relatively small within 2-7 kHz.

关 键 词：砂槽模型试验 堤基管涌 声发射特性参数 离散小波包 

分 类 号：O357.3[理学—流体力学]