高桩码头三维效应影响区域的缺陷检测分析

由于上部结构的影响，当采用低应变反射波法进行高桩码头桩基检测时，会出现不满足一维应力波基本假定的情况。利用LS—DYNA有限元软件模拟高桩码头群桩结构，发现桩顶以下10m深度范围内都会受到三维效应的严重影响，检测结果呈现出类似于浅部缺陷的特征。利用各种浅部缺陷的定位方法对该区域进行检测，得出纵波改进方法在该区域不再有效，只有结合扭转波检测等方法才能有效定位缺陷，对于实现高桩码头桩基质量的全面检测具有重要的借鉴意义。

Defect Detection and Analysis of 3D Effect Zone of High-piled Wharf

Being influenced by the superstructure, when low-stress reflect wave method is used to detect high-piled wharf foundation, basic assumed condition of one-dimension stress wave may not be satisfied. LS-DYNA finite element software is used to simulate the structure of high-piled wharf, which shows that the signal is seriously influenced by 3D effect in the extent of 10 meters under the pile head. The detection result is characterized with superficial defects. The superficial defect positioning methods will be used to detect the area, it is found that the improved longitudinal wave method is no longer valid, and the defects can be positioned effectively only by combining with torsional wave detection method. The above conclusion will play an important role in overall quality detection of high-pile wharf foundation.