预应力孔道灌浆饱满度弹性波属性特征研究

发布时间：2018-01-24 11:06

本文关键词： 孔道灌浆无损检测数值模拟弹性波属性　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：预应力混凝土结构由于使用了高强材料，不但节省大量的钢材和混凝土，还提升了结构的刚度、耐久性等，在我们国家的整个基础设施建设领域得到了广泛的应用，但由此带来的预应力筋锈蚀问题显得格外突出，并且由此引发的质量事故也在逐年增加。对于预应力孔道灌浆饱满度的无损检测，国内外的研究者们经过多年的理论研究和现场检测，取得了大量宝贵的理论成果和试验经验，在一些工程实践中，也有了一些应用；但是受到理论研究、技术水平、检测设备等多方面因素的限制，且缺乏相应的技术规程，在这一领域的研究没有取得实质性进展。本文是根据浆体与岩体的相似性，基于地球物理勘探原理，通过数值模拟分析弹性波在浆体中的传播规律，研究弹性波属性的变化规律，既而为孔道灌浆饱满度检测工作提供新思路、新方法。文章首先介绍了当前孔道灌浆的施工工艺，从工艺入手分析了孔道灌浆病害的种类以及产生的原因，为模拟孔道灌浆后的病害种类提供依据；接着分析总结了弹性波属性在实际工程中的应用，通过对这些应用的分析研究，可以为建立弹性波属性评价理论提供依据；通过数值模拟技术，研究弹性波在不同饱满度状况下的转播规律，经过处理分析，从中找出与饱满度有相关关系的弹性波属性参数，通过建立实体物理模型进行验证，，并将其应用到实际饱满度检测中。基于弹性波的地震属性技术在石油勘探领域的应用已经很成熟，而在交通土建无损检测领域，弹性波属性的应用还存在较大的局限性，近些年来这一领域的研究并没有实质性进展；作者在研读了大量地震属性方面的资料后，试着从地球物理勘探的技术思路出发，把地震属性技术移植到工程无损检测领域，可为预应力孔道灌浆饱满度检测提供了新的思路。
[Abstract]:Because of the use of high-strength materials, prestressed concrete structures not only save a lot of steel and concrete, but also improve the stiffness and durability of the structure. In our country, the whole field of infrastructure construction has been widely used, but the problem of the corrosion of prestressed tendons is particularly prominent. And the quality accident caused by it is also increasing year by year. For the non-destructive testing of the filling degree of prestressed hole grouting, researchers at home and abroad have been through many years of theoretical research and field testing. A large number of valuable theoretical results and experimental experience have been obtained, in some engineering practice, there are also some applications; However, limited by many factors, such as theoretical research, technical level, testing equipment and so on, and lack of corresponding technical regulations, no substantial progress has been made in this field. According to the similarity between slurry and rock mass and based on the principle of geophysical exploration, this paper analyzes the propagation law of elastic wave in slurry by numerical simulation, and studies the variation law of elastic wave attribute. Therefore, this paper provides a new idea and method for detecting the filling degree of hole grouting. Firstly, this paper introduces the construction technology of hole grouting at present, and analyzes the types and causes of the defects of hole grouting. It provides the basis for simulating the disease types after grouting. Then, the application of elastic wave attribute in practical engineering is analyzed and summarized. Through the analysis and research of these applications, the evaluation theory of elastic wave attribute can be established. Through numerical simulation technology, the relaying law of elastic wave under different degree of fullness is studied, and through processing and analysis, the attribute parameters of elastic wave which are related to the degree of fullness are found out. The physical model is established and applied to the actual fullness detection. Seismic attribute technology based on elastic wave is very mature in the field of petroleum exploration, but in the field of non-destructive detection of traffic civil engineering, the application of elastic wave attribute is still limited. No substantial progress has been made in this area in recent years; After reading a lot of seismic attribute data, the author tries to transplant seismic attribute technology to engineering nondestructive testing field based on the technical thinking of geophysical exploration. It can provide a new idea for detecting the filling degree of prestressed channel grouting.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.551

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