【作者】 贺会团；

【导师】 张献民；

【作者基本信息】 河北工业大学 ， 结构工程， 2004， 硕士

【摘要】 目前，关于复合地基承载力的检测方法有很多，但大多采用静载试验或原位测试方法获取复合地基承载力，费时费力，而且不能进行大面积、整体的检测和评价。因此本文建立了一种新的、快速的利用瑞雷面波检测复合地基承载力的方法。文章通过分析国内外标准贯入击数与剪切波速、标准贯入击数与变形模量、剪切波速与地基土承载力之间的关系模型，并考虑到地区性和土质类别的差异，分别选用日本公路桥梁抗震设计新规程模型(日本模型)、武汉地区模型、下辽河平原模型三种模型建立了新的桩土应力比计算模型——应用瑞雷波速求解桩土应力比之间的计算模型。文章结合实例对桩土应力比的影响因素进行了讨论，并重点分析了置换率、桩土模量比、碎石桩变形模量、桩间土瑞雷波速对桩土应力比的影响。分析表明：面积置换率对桩土应力比的取值影响不大，桩土模量比是影响应力比取值的重要因素。通过对17根碎石桩变形模量的研究发现，在施工质量得以保证的情况下，变形模量取值变化范围不大，对n的取值影响不大，对此我们给出碎石桩变形模量随荷载变化的关系模型。因此，桩间土的变形模量，即桩间土的瑞雷波速成为影响n取值的主要因素。根据复合地基承载力应力比计算公式，基于本文提出的应力比计算模型的基础上推导了瑞雷波速和碎石桩复合地基承载力之间的关系模型，建立了日本模型、武汉地区模型、下辽河平原模型三种模型的碎石桩复合地基承载力计算公式。为进一步对本文提出的计算模型进行检验，文章以廊坊市检察院办公楼、三河市华泰花园B座、三河市北关三个碎石桩复合地基场地为基础，通过和静载荷试验结果进行对比，对所建立的模型进行验证。实践表明：应用瞬态瑞雷波技术，通过快速检测桩间土的剪切波速，可以快捷全面地对复合地基的承载力进行检测和评价。通过与静载试验结果进行对比，证明了该方法的有效性，从而为复合地基的检测提供了一种新的途径。与静载试验、钻孔法等原位测试方法相比，瞬态瑞雷波检测复合地基技术具有成本显著降低、效率高、无破损等特点，可节省大量的人力物力，从而可以实现复合地基承载力大范围、全面的检测和评价，打破以往只能局部抽检的局面。更多还原

【Abstract】 Now there are many inspecting method of compound foundation bearing capacity, but most of them are base on the static load test or the original place test to obtain the compound foundation bearing capacity. These methods are time-consuming and laboursome, and they can’t give the compound foundation a wide-ranging, integral inspection and evaluation. So a new and fast method that applying Rayleigh surface wave to inspect the bearing capacity of compound foundation is given in this thesis. In the thesis domestic and foreign relation model of standard penetration blow count and shearing velocity, standard penetration blow count and deformation modular, shearing velocity and foundation bearing capacity are analyzed. On base of these analysis a new calculation model that applying Rayleigh wave velocity to calculate the stress ratio of pile and soil between piles is established. Because of the difference of region and soil character, the new model own three branch model, ie, Japan Model, Wuhan Model, Xia Liaohe Model, in three different conditions. Associating example, the influence factors of the stress ratio of pile and soil are discussed, especially the replacement rate, the modular ratio of pile and soil, deformation modular of gravel pile, Reyleigh wave velocity of soil between piles are given more effort. The analysis show that the influence given by the area replacement rate is very little, while the modular ratio of pile and soil is a important influence factor. The research about the deformation modular of 17 gravel piles show that the variation rage of gravel pile deformation modular is little, so long as the construction quality is good. So the deformation modular of soil between piles, that is the Rayleigh wave velocity of soil between piles is the capitally influence the sampling of n. According to the calculation formula of the ratio of pile and soil of compound foundation bearing capacity, and base on the calculation formula of the ratio of pile and soil given in this thesis, the relation model of Rayleigh wave velocity and gravel pile compound foundation bearing capacity is deduced. Three models, ie, Japan Model, Wuhan Model, Xia Liaole Model about gravel pile compound foundation bearing capacity are established. To verify the three model established above, the calculation results are contrasted to the result of static load test base on such three yard as Langfang City Law building, Sanhe City Huatai Garden building B, Sanhe City North Pass. The contrast result show that the methodgiven in this thesis is available. Thus, it offer a new method to inspect the compound foundation. Contrast to such original place test method as static load method and drilling method, the method that applying transient Rayleigh surface wave to inspect the compound foundation own many virtues as low cost, high efficiency, non-destruction, and it also can save much labour and effort. Furthermore, it can implement the large-wide and comprehensive inspection and evaluation of compound foundation bearing capacity. Consequencely, it break the old situation that the inspection of compound foundation bearing capacity only can be partial and selective.更多还原