【作者】 李世涌；

【导师】 吴继敏；

【作者基本信息】 河海大学 ， 地质工程， 2004， 硕士

【摘要】 桩基础通常在地下或水下，属隐蔽工程，施工程序繁、技术要求高、施工难度大，容易出现质量问题。而桩基础，特别是大型桩基的质量直接关系到整个建筑物的安危，所以为确保人民生命和财产的安全，必须严格控制桩基的质量。这就要求把更先进的检测方法应用到桩基检测中来，而层析成像技术就是一种非常先进的检测方法，它在医学中应用的非常成熟和广泛，最近二十年才应用到地球物理探测和无损检测中来的，它能精确反演被测物体的内部构造，得到清晰的图像。 目前，工程中常用的桩基检测方法很多，但都存在着一些弊端：有的对桩破坏性严重，例如抽芯检测；有的耗时、耗财、耗力，例如静载荷试验；还有的如低应变、高应变等检测技术由于受到桩长、桩径以及现场一些特殊情况的限制，操作很不方便，而且采集到的波形要经过比较复杂的处理分析方能得出结论，而这个结论却还要辅助取芯手段加以验证。 针对这些问题，本文将医学上常用的层析成像技术应用到桩基检测中来，用超声波扫描桩身，根据接收到的声时读数和一些相关信息反演超声波在桩身各个部位的传播速度，再根据超声波速来确定桩身强度以及缺陷的范围、形状、大小等，非常直观、全面、准确。这些结果的得出主要是通过作者编制的层析成像系统来完成的。文章的最后，运用超声波层析成像技术检测了苏通大桥F1标24前左1号桩以及宿淮高速公路五河口斜拉桥26号墩26-3号桩，取得了很好的效果，验证了层析成像技术的可靠性、先进性和优越性。更多还原

【Abstract】 The piles are usually laid under the ground or the water, which are convert projects. The problem of quality is easy to come with the various processes, high technology, and great difficult of the projects. The piles, especially the quality of huge piles play a very important role in the safety of the whole construction. Therefore, in order to keep the safety of people’s life and property, the quality of the piles should be strictly controlled. Then the more advantaged detection technique is needed to be used in the pile detection. Computed Tomography is just such an advantaged technique, which has been widely and maturely used in iatrology, and in exploration of geophysics and scatheless detection in recent twenty years. It can reflect the inside structure of the inspected object precisely and gain the clear figure.Nowadays, the ways to detect the piles are various, and all of them are limited in some aspects. For instance, Coring Test do large scathe on the piles, and Static Load Test will waste much time, money and energy, while some ways are hard to operate as the limitation of the length and the diameter of the piles, and the special condition on the spots, such as high-Strain, low-Strain, and so on. Furthermore, the result can only be gained under the complex analysis of the collected wave, and under the validation of the Coring Test.According to all the above problems, this paper, states the application of Computed Tomography, which is widely used in iatrology, in pile detection. By using the ultrasonic to scan the pile, and reflecting the transmitting-speed of ultrasonic in each part of pile according to the readout of voice and some relative information, and the speed of ultrasonic, the strength of the pile and the range, shape and size of the objection are confirmed directly, roundly and precisely. All the results are gained through the Computed Tomography System, which is authorized by the author. At last, the successful using of Computed Tomography in No. 1 Pile in the left of Honest 24 of F1 Bid of Su-Tong Bridge and No. 3 Pile of Honest 26 of Wuhekou Bridge of Su-Huai Speedway, validate the reliability, advantage, and superiority of the Computed Tomography.更多还原