高应变曲线拟合法在PHC管桩检测中的研究

发布时间：2018-05-21 04:32

本文选题：单桩承载力 + 高应变动测　；参考：《福州大学》2014年硕士论文

【摘要】：桩基础目前在工程中的应用日益广泛,由于桩基础属于隐蔽工程,桩基础的设计、计算、施工、检测等方面往往比上部建筑结构更加复杂,因此,桩基的质量检测成为了工程质量控制的一个重要组成部分,单一的静载法日益显得无法满足桩基工程质量诊断的需要,因此高应变法被大量用来检测桩基工程质量。本文在前人研究的基础上,结合高应变试验,对高应变CSAE法的阻尼系数和高应变曲线拟合法的参数进行了深入的研究,通过破坏性静载荷试验对高应变CSAE法和高应变曲线拟合法的准确性进行了验证,并提出了两种持力层下CASE系数的取值范围。主要研究成果和结论如下：(1)总结了杆的一维波动方程、波动方程的解。对无限杆长、有限杆长、变阻截面、摩阻力杆等情况分类和讨论,为桩基高应变法的研究提供了严格的理论依据。(2)研究了高应变检测法的三种分析计算方法：SMITH法、CASE法、曲线拟合法,并对三种方法的基本原理、技术方法以及桩—土模型做出总结。(3)采用高应变试验,对试验场地内的九根桩PHC管桩的高应变实测曲线进行拟合,并计算出了相应的单桩极限承载力。分别单独改变曲线拟合法模型的相关参数,进行计算,得到某个参数对计算曲线产生的影响及其变化规律。(4)对于高应变CASE法,通过PHC管桩的静动对比试验,得到不同持力层CASE阻尼系数的最优值。(5)对于高应变曲线拟合法法,通过PHC管桩的静动对比试验,高应变曲线拟合法的精确度相对较为准确。该试验证明,高应变动力测试法能够有效的补充,甚至部分取代传统静载荷试验。
[Abstract]:Pile foundation is widely used in engineering at present. Because pile foundation belongs to hidden engineering, the design, calculation, construction and inspection of pile foundation are often more complicated than that of upper building structure. The quality detection of pile foundation has become an important part of engineering quality control, and the single static load method is increasingly unable to meet the needs of quality diagnosis of pile foundation engineering, so the high strain method is widely used to detect the quality of pile foundation engineering. In this paper, the damping coefficient of the high strain CSAE method and the parameters of the high strain curve fitting method are deeply studied on the basis of previous studies and combined with the high strain test. The accuracy of the high strain CSAE method and the high strain curve fitting method are verified by the destructive static load test, and the range of CASE coefficients under the two kinds of bearing layers is proposed. The main research results and conclusions are as follows: (1) the one-dimensional wave equation and the solution of the wave equation are summarized. The classification and discussion of infinite bar length, finite bar length, variable resistance section and frictional resistance bar provide a strict theoretical basis for the study of high strain method of pile foundation. (2) three analytical and computational methods of high strain detection method, called: Smith method and case method, are studied. Curve fitting method, and summarizing the basic principle, technical method and pile-soil model of the three methods. The high strain test is used to fit the high strain measured curves of nine PHC pipe piles in the test site. The corresponding ultimate bearing capacity of single pile is calculated. By changing the relevant parameters of the curve fitting model separately and calculating, the influence of a certain parameter on the calculation curve and its variation law are obtained. For the high strain CASE method, the static and dynamic comparison test of PHC pipe pile is carried out. The optimum value of CASE damping coefficient of different bearing layers is obtained. For the high strain curve fitting method, the accuracy of the high strain curve fitting method is relatively accurate through the static and dynamic contrast test of PHC pipe pile. It is proved that the high strain dynamic test method can supplement or even partially replace the traditional static load test.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU473.1

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