强夯加固地基承载力与变形模量原位测试的试验研究

发布时间：2019-04-25 21:08

【摘要】：原位测试是解决岩土工程特性必要的工程技术手段,其中平板载荷试验方法是最直接反应岩土体工程性质,是岩土工程界历来推崇的最可靠方法。但平板载荷试验仅反映平板宽度或直径的2倍左右深度范围内的土层工程特性,完全采用大型平板载荷试验确定各土层工程特性则所需检测费用过高而且所耗时过长。现场标贯、动力触探试验和瑞利波试验等原位测试方法能比较快捷、经济的反映岩土工程特性,可以很好的弥补平板载荷试验的缺陷。因此,根据现场试验数据建立平板载荷试验法与动力触探、瑞利波试验等快捷、经济试验方法之间的相关关系,建立承载力和变形模量表,可以通过动力触探和瑞利波测试来反映岩土工程特性,这对工程实际有着深远的意义。本文将通过工程实例对其展开研究。本文首先逐一介绍平板载荷试验,动力触探试验和瑞利波试验的技术理论及数据统计方法。其次根据抚顺某碎石类强夯处理工程的原位测试数据按不同夯击能统计强夯后地基承载力特征值和变形模量。最后,进行了平板载荷试验与超重型动力触探试验、平板载荷试验与瑞利波试验统计分析,并建立碎石类强夯地基承载力特征值与超重型动力触探击数,地基承载力特征值与瑞利波速的相关关系。根据所得成果与同类土天然地基经验关系进行了对比分析，，得到了折减系数,可用来指导今后强夯地基的检测实践。
[Abstract]:The in-situ test is a necessary engineering method to solve the geotechnical characteristics. The plate load test method is the most direct reaction to the engineering properties of rock and soil and the most reliable method which has always been respected in geotechnical field. However, the plate load test only reflects the engineering characteristics of the soil layer in the depth range of about 2 times the width or diameter of the plate, and the testing cost is too high and the time consuming is too long to determine the engineering characteristics of each soil layer by the full use of the large-scale plate load test. The in-situ testing methods, such as in-situ standard penetration test, dynamic penetration test and Rayleigh wave test, can reflect the geotechnical characteristics economically and quickly, and can make up for the defects of plate load test. Therefore, according to the field test data, the correlation between plate load test method and dynamic penetration test, Rayleigh wave test and other fast and economical test methods is established, and the bearing capacity and deformation model table is established. The characteristics of geotechnical engineering can be reflected by dynamic sounding and Rayleigh wave testing, which has far-reaching significance for engineering practice. This article will carry on the research to it through the engineering example. In this paper, the technical theory and statistical method of plate load test, dynamic sounding test and Rayleigh wave test are introduced one by one. Secondly, according to the in-situ test data of a gravel-like dynamic compaction treatment project in Fushun, the characteristic value of bearing capacity and deformation modulus of the foundation after dynamic compaction are calculated according to different tamping energy. Finally, the plate load test, superheavy dynamic penetration test, plate load test and Rayleigh wave test were carried out, and the characteristic value of bearing capacity and the number of super heavy dynamic penetration were established. The correlation between the characteristic value of foundation bearing capacity and Rayleigh wave velocity. Based on the comparison and analysis of the empirical relationship between the results obtained and the natural foundation of the same kind of soil, the reduction coefficient is obtained, which can be used to guide the testing practice of the dynamic compaction foundation in the future.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU472.31

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