柔性路面在非破坏性检测中的力学性质研究

发布时间：2018-03-03 04:08

本文选题：非线性　切入点：非破坏性检测　出处：《兰州大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国现在处于经济高度发展的时期,每一项基础建设都在如火如荼的进行当中,作为保障经济快速发展的命脉之一的公路建设也不例外。结合我国国情,我国幅员辽阔,每个地区的地理自然条件,经济发展条件都不尽相同,所以我国公路建设发展呈现不平衡的状态,相比经济发达地区我国的某些西部地区的交通发展还相对滞后。建设公路网需要设计,建造,养护,检测,管理等许多方面共同发展。在大量公路已建成的情况下,路面检测将成为今后工程和科学界研究的热点,在众多现有的路面检测手段之中,非破坏性检测(NDT, Non-destructive Testing)有着巨大的优势并在我国得到广泛的推广。顾名思义,它能够在不破坏路面结构的基础上进行检测试验并根据所测量的结果对路面材料进行力学性质研究。国内外对这个领域的发展也已经持续了几十年。在已有的路面力学非线性模型的基础上刘明楼老师对理论提出改进,并结合力学和物理实际对原有本构做了合理简化,本研究通过反算计算证明模型大大减少了计算量和分析时间,提高了效率,同时理论与实际的误差也在合理的范围之内。虽然我国的非破坏性检测技术已得到长足发展,但是限于实验条件和数据收集的准确性,本研究从国内外众多的公路的检测之中采用美国联邦公路管理局长期路面评估计划(LTPP, Long-Term Pavement Performance)的实验数据进行力学性质研究。首先,从数据库中挑选出符合非线性本构的路面弯沉数据,结合本研究改进的有限元反算程序可以计算得到路面材料的力学性质。其次,根据这些力学性质采用随机有限元理论并结合路面非线性力学模型计算出理论情况下的路面各项力学性质统计参数。最后利用正算和反算得到的各项计算结构探讨材料变异性线性和非线性对结构分析的影响。
[Abstract]:Our country is now in a period of high economic development, and every basic construction is in full swing. Highway construction, as one of the lifeblood of ensuring rapid economic development, is no exception. According to the national conditions of our country, our country has a vast territory. The geographical and natural conditions and economic development conditions of each region are different, so the development of highway construction in China presents an unbalanced state. Compared with the economically developed areas, the traffic development in some western areas of China is still relatively lagging behind. The construction of the highway network requires the joint development of many aspects, such as design, construction, maintenance, inspection, management, etc. Under the condition that a large number of highways have been built, Pavement detection will become a hot spot in the future engineering and scientific research. Among the many existing pavement detection methods, non-destructive detection (Non-destructive testing) has great advantages and has been widely promoted in China. As the name implies, It can detect and test the pavement structure without destroying the pavement structure and study the mechanical properties of the pavement material based on the measured results. The development of this field at home and abroad has been going on for several decades. On the basis of nonlinear model of plane mechanics, teacher Liu Minglou proposed to improve the theory. Combined with mechanics and physical practice, the original constitutive structure is reasonably simplified. The model is proved by inverse calculation to greatly reduce the calculation amount and analysis time, and improve the efficiency. At the same time, the theoretical and practical errors are within a reasonable range. Although the non-destructive detection technology in China has made great progress, it is limited to the experimental conditions and the accuracy of data collection. In this study, the mechanical properties of the long term pavement Assessment Program (LTPP, Long-Term Pavement performance) of the Federal Highway Administration are studied from many highway tests both at home and abroad. The pavement deflection data which accord with the nonlinear constitutive model are selected from the database, and the mechanical properties of the pavement materials can be calculated by using the improved finite element inverse calculation program. According to these mechanical properties, the statistical parameters of the pavement mechanical properties are calculated by using the stochastic finite element theory and the nonlinear mechanical model of the pavement. Finally, by using the positive calculation and the inverse calculation, the structure of each calculation is explored. The influence of linear and nonlinear variability on structural analysis is discussed.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U418.6

【相似文献】