超声波透射法在桩身检测中的应用

发布时间：2018-04-27 06:31

本文选题：桩基 + 超声波　；参考：《湖北工业大学》2017年硕士论文

【摘要】：桩基础是处理软弱地基、减少建筑物沉降的有效方法之一。随着我国建筑业事业的迅速发展,桩基得到挂广泛的应用。但由于桩基是地下隐蔽工程,受施工工艺、地质条件、建筑材料等诸多因素影响,任一环节的失误,都有可能影响到桩身的质量,从而直接影响上部结构的安全。目前桩基质量检测的方法有很多,其中,采用超声波检测混凝土强度和缺陷,是在不影响结构或构件受力性能或其他使用功能的前提下,直接进行检测并推定混凝土强度或评估混凝土缺陷,由于混凝土无损检测技术具有直接、快速、灵活、重复、可靠、经济等优点,在工程检测中得到了日益广泛的应用。本文首先阐述了国内外关于超声波桩基质量检测的历史与进展,以及灌注桩常见的缺陷问题,其次,通过介绍超声波的基本原理,结合具体的工程实例,详细分析混凝土中的声学参数与混凝土质量的关系。最后将灰色理论引入到超声波质量判定中,对超声波质量检测中的各种声学参数采用灰色聚类综合评价的方法,并且采用了实例分析和验证。得到灰色聚类判断结果与传统方法判断结果一致,证明了综合判别法的准确性;对于使用传统方法判断不准确甚至无法判断的现象,灰色聚类综合判别法能达到一定的判别效果,显示了其优越性。
[Abstract]:Pile foundation is one of the effective methods to deal with soft foundation and reduce building settlement. With the rapid development of China's construction industry, pile foundation is widely used. However, the pile foundation is an underground hidden project, which is affected by many factors, such as construction technology, geological conditions, building materials and so on. The failure of any link may affect the quality of pile body and directly affect the safety of superstructure. At present, there are many methods for testing the quality of pile foundation. Among them, ultrasonic testing of concrete strength and defect is done without affecting the mechanical performance of structure or component or other functions. Because of the advantages of direct, rapid, flexible, repetitive, reliable, economical and so on, the nondestructive testing technology of concrete has been widely used in engineering testing because of its direct, fast, flexible, repeatable, reliable and economical advantages, such as direct detection and estimation of concrete strength or evaluation of concrete defects. This paper first describes the history and progress of ultrasonic pile foundation quality inspection at home and abroad, as well as the common defects of cast-in-place pile. Secondly, by introducing the basic principle of ultrasonic wave, combined with concrete engineering examples, The relationship between acoustic parameters and concrete quality is analyzed in detail. Finally, the grey theory is introduced into the ultrasonic quality evaluation, and the grey cluster comprehensive evaluation method is used to evaluate the acoustic parameters in ultrasonic quality detection, and an example is used to analyze and verify it. The result of grey clustering is consistent with that of the traditional method, which proves the accuracy of the comprehensive discriminant method, and for the phenomenon that the traditional method is not accurate or even can not be judged. The grey clustering comprehensive discriminant method can achieve certain discriminant effect and shows its superiority.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU473.16

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