【摘要】 桩基质量检测,特别是桩体完整性及损伤程度的评估,一直是岩土工程界十分重要的问题,目前常规物探方法难以取得良好的成像效果。采用电磁波层析成像技术(EWCT)进行钻孔灌注桩质量检测是一个新的手段。该方法是通过分析桩体缺陷的二维图像分布,实现桩基质量检测。本文设计并测试了适合桩基质量检测应用的电磁波层析成像的观测系统、数据采集技术以及资料处理方法等问题,并结合一个成功的工程实例说明该方法的应用效果。在该工程中,作者将CT反演结果加以钻孔资料验证。分析结果表明,电磁波层析成像技术(EWCT)具有较高的精度和可信度。当桩体存在多层各类缺陷时,该方法能有效、精确的反演出井间桩体的不均匀分布,成像层次清晰,异常分布明显直观,结合相关工程资料,可对桩体混凝土的内部结构与质量作出准确的评价。更多还原

【Abstract】 Quality inspection of pile foundations, is very important in the field of geotectonic engineering, especially engineering evaluation of integrality and damage degree. Electromagnetic wave computerized tomography (EWCT) is a new geophysics method for quality inspection of pile foundations. The main technological objective of EWCT is to acquire 2D images of defect distribution in the pile foundation and to evaluate the quality of pile foundation. This paper designs and tests the observation system and technique of data collections in EWCT as well as data processing of EWCT to the quality inspection of pile foundations. With a practical engineering example of successful application, the paper illustrates the effectiveness of this method. In the engineering demonstration, through the field tests data, the author acquire the CT images derived from the data inversion, then combined the result of CT technology and the result of drilling survey data. The comparative result shows that EWCT has the advantages of higher precision and credibility. When the pile foundations have inhomogeneous defects of layers, this method can efficiently and accurately make precise image of the defects distribution between wells. Electromagnetic tomography levels is clear, defects distribution is obvious and intuitive. Combining with other engineering geologic data, the interior structure and quality of concrete can be evaluated accurately through qualitative analysis and quantitative analysis.更多还原