基于横波传播特性的无损检测方法及在沉管隧道基础灌砂检测中的应用  

An non-destructive detecting method based on the shear wave propagation characteristics and its application on grouting quality of an immersed tube tunnel foundation base

作　　者：张腾瑜 车爱兰[1] 惠祥宇 冯少孔[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《振动与冲击》2017年第20期30-36,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(11372180)

摘　　要：采用各种探测手段揭示目标介质内部构造一直是工程界所关心的重要课题。以三维层状介质中的弹性场传播特性为基础,建立基于横波传播特性的无损检测方法。采用有限元数值模拟方法,针对含有低速夹层的水平层状介质模型,获得下部介质变化时横波响应波形数据,并对其进行波形形态、响应能量等特性分析,揭示当低速夹层介质的物理参数改变时,在模型表面接收到的横波响应特性与下部介质的相对密实度等参数的关系,明确基于横波传播特性的无损检测方法的有效性和精确性。在数值计算的基础上,开展沉管隧道底板灌砂全尺寸模型试验研究,采集灌砂施工前后的横波响应波形数据,通过对横波响应波形形态及响应能量分布进行可视化处理,实现对沉管隧道底板灌砂效果的评价。Using a variety of detection means to reveal the internal structure of underground medium has always been an important issue in geotechnical engineering. A non-destructive detecting method based on the propagation characteristics of shear wave in three-dimensional layered media was presented. To verify the method, it was applied into a numerical three-dimensional stratified model and a series of dynamic responses were obtained when the physical parameters of interlayer were changed. With a series of waveform treatments including filter process, waveform energy normalization and waveforms mitigation based on correlation analysis, the relationship between shear wave response characteristics and relative compactness of interlayer was established. A n d its feasibility and accuracy for recovering the unknown parameters of low-velocity layer were certified. Based on the results of numerical cases, this method was used for the grouting quality detection in full-scaled model tests of an immersed tube tunnel. The relative compactness of interlayer under the tunnel floor was obtained using visual processing. As a result, the grouting quality was effectively evaluated.

关 键 词：横波 传播特性 响应能量 相对密实度 灌砂效果 

分 类 号：TU435[建筑科学—岩土工程]