Surface Wave-Based Health Monitoring Method for a Sheet Pile Quay Wall
Surface Wave-Based Health Monitoring Method for a Sheet Pile Quay Wall
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DOI：
10.1142/s0219455414400094
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发表时间：
2014-06
影响因子：
3.6
通讯作者：
K. Ichii;K. Kitade;Mayumi Kawano;Ikuo Taguchi
中科院分区：
文献类型：
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作者：
K. Ichii;K. Kitade;Mayumi Kawano;Ikuo Taguchi
港口结构，如桩支撑墩和码头墙，通常面临严峻的条件，并经常观察到港口结构的恶化。以板桩码头墙为例，板桩是一种易腐蚀的结构构件。由于板桩劣化，回填土在潮汐作用下会被冲出。泛洪是指细颗粒被冲出和土层松动的现象，是码头护岸过程中需要考虑的问题。因此，有必要对板桩岸墙回填体进行健康监测。本文研究了面波法在板桩码头墙健康监测中的适用性。首先，通过弯折单元试验，测量了渗流和含水率变化对地面横波速度的影响。在此基础上，对板桩码头墙进行了二维有限元动力分析。从分析结果来看，基于表面波法估计的剪切波速剖面与假设的土壤剖面吻合较好。最后，对某板桩码头墙体进行了面波测量，并将测量结果与瑞典测深试验结果进行了比较。此外，用面波法成功地测量了退潮时与涨潮时横波速度剖面的差异。从而验证了面波法在板桩码头墙分析中的适用性。
Port structures such as pile supported piers and quay walls generally face severe conditions, and deterioration of port structures is often observed. For an example, at a sheet pile quay wall, sheet pile is a structural component which is easily deteriorated by corrosion. As a result of deterioration of sheet pile, the backfilled soil would be washed out due to the tidal action. Suffusion, the phenomena of the washed out of fine particles and loosening of soil layer, is a problem to be considered in the maintenance of a quay wall. Therefore, a health monitoring method for the backfill of a sheet pile quay wall is necessary. In this study, the applicability of a surface-wave method for health monitoring of a sheet pile quay wall was examined. First, the variation of shear wave velocity in the ground due to suffusion and variation in water content is measured from bender element tests. Then, 2D finite element method (FEM) dynamic analysis was conducted to simulate a surface-wave measurement on a sheet pile quay wall. From the result of the analysis, the estimated shear wave velocity profile based on surface-wave method agrees fairly well with the assumed soil profile. Finally, surface-waves were measured at a sheet pile quay wall, and the measured results were compared with the result of Swedish weight sounding test at the site. Furthermore, the difference between the shear wave velocity profiles at ebb tide and that at high tide was successfully measured by the surface-wave method. Thus, the applicability of the surface-wave method for a sheet pile quay wall is demonstrated in this study.