一种针对岩土工程缺陷检测问题的冲击映像方法及应用研究

发布时间：2018-01-03 23:33

本文关键词：一种针对岩土工程缺陷检测问题的冲击映像方法及应用研究　出处：《岩土力学》2017年09期 　论文类型：期刊论文

【摘要】：采用各种探测手段揭示目标介质内部构造的信息一直是工程界所关心的重要课题。以弹性波在不同介质交界面传递特性为理论基础,明晰冲击映像检测方法的基本原理。采用有限差分数值模拟方法,针对含有低速夹层的水平层状介质模型,获得各工况下响应波形数据,并对其进行振幅大小、主频能量及时频分析,从而揭示当低速夹层介质的物理参数改变时,在模型表面一定位置所接收到的响应波形的振幅、频谱及时频的变化规律,验证冲击映像检测方法有效性和精确性。在数值计算的基础上,将冲击映像法应用于天津滨海海河沉管隧道底板注浆效果检测分析,根据现场采集的实测响应波形数据,通过对响应波形可视化处理、频谱分析及时频分析,比较注浆前、后的弹性波特性变化,实现对沉管隧道底板注浆效果的综合评价,获得了良好的检测效果。
[Abstract]:It has been an important topic in engineering field to reveal the information of the internal structure of the target medium by various detection methods. The theory is based on the transfer characteristics of elastic wave at the interface of different media. Using the finite difference numerical simulation method, for the horizontal layered medium model with low velocity intercalation, the response waveform data under each working condition are obtained, and the amplitude of the response waveform is obtained. When the physical parameters of low-speed interlayer medium change, the amplitude of the response waveform and the variation law of the spectrum time-frequency are revealed in a certain position on the surface of the model. On the basis of numerical calculation, the impact image method is applied to the detection and analysis of grouting effect on the bottom plate of Tianjin Binhai River tube sinking tunnel. According to the measured response waveform data collected in the field, the changes of elastic wave characteristics before and after grouting were compared by visualizing the response waveform and analyzing the frequency spectrum in time. The comprehensive evaluation of the grouting effect of the bottom plate of the immersed tunnel is realized, and a good test result is obtained.
【作者单位】：上海交通大学船舶海洋与建筑工程学院;上海城建市政工程(集团)有限公司;
【基金】：国家自然科学基金面上项目(No.11372180)~~
【分类号】：U456.3;U459.5
【正文快照】： 在岩土工程领域,利用弹性波反射技术进行地质勘察和无损检测一直是国内外学者和工程师所关注的课题。冲击映像法作为一种基于弹性波反射原理的无损检测方法,它是根据地下介质的弹性和密度差异,通过观测和分析地层对人工激发产生弹性波的振幅和走时响应推断地下岩层介质的性质

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