强夯施工对塑性混凝土防渗墙的振动测试分析  

Testing and analysis for vibration of a plastic concrete impermeable wall caused by dynamic compaction

作　　者：陆凡东[1] 方向[1] 董文[1] 丁凯[1] 李栋[1] 

机构地区：[1]解放军理工大学工程兵工程学院,南京210095

出　　处：《振动与冲击》2012年第1期68-71,166,共5页Journal of Vibration and Shock

摘　　要：提出强夯施工时塑性混凝土防渗墙的振动测试方案。试夯数据表明,加速度控制指标0.1 g比速度控制指标5 cm/s更加严格;给出5个不同能级对应第一、二遍点夯的安全保护范围。基于Hilbert-Huang Transform信号方法的时频分析可知,不同夯击能级引起塑性混凝土防渗墙墙体测点的振动主频均小于20 Hz;强夯施工对埋深仅为5 m的塑性混凝土防渗墙的振动影响,瑞利波占主导地位,表现为墙体上端率先振动,且振动强度最大;塑性混凝土防渗墙沿墙高的垂向应力分布比较均匀;瑞利波由于受地基分层的频散影响,当主频降低时,波速和波长增加,最大瞬时能量和主频对应能量小幅增加。A proposal based on vibration test of a plastic concrete impermeable wall caused by dynamic compaction was presented. Test data showed that acceleration control index 0. lg is more stringent than speed control index 5cm/s; safety protection ranges of five different damping energy levels are given. Based on time-frequency analysis of HHT method, it was shown that the dominant frequencies of monitored points of the plastic concrete impermeable wall under different damping energy levels are lower than 20Hz; Rayleigh wave plays a dominant role in the vibration of the plastic concrete impermeable wall buried five meters deep from the land surface, the top of the wall vibrates firstly and has the largest intensity; stress distributes uniformly along the wall in the vertical direction; due to the influence of the layered foundation on Rayleigh wave, when the dominant frequency descends, wave velocity and wave length increase, so do the maximum instantaneous energy and the energy at the dominant frequency.

关 键 词：强夯 塑性混凝土防渗墙 振动测试 时频分析 

分 类 号：TV32[水利工程—水工结构工程]