基于弯沉的道面结构分析系统研究

发布时间：2019-06-14 20:11

【摘要】：HWD(Heavy Weight Deflectometer)弯沉测试是机场道面结构性能测试与分析的最重要技术手段。由于HWD测试技术引入我国尤其是民航机场领域的历史很短,所以对其测试的理论与方法、测试结果的可靠性等问题缺乏系统研究,这些问题也一直是工程及学术界研究的热点。基于上述背景,本论文开展了如下工作:(1)对弯沉盆面积指数法进行了理论分析、试验验证并对该方法进行了修正。采用美国NAPTF(National Airport Pavement Test Facility)模型道面弯沉测试数据,将目前我国民航机场道面采用的弯沉盆面积指数法与国际上主要的4种类似方法进行了对比分析,结果表明我国目前采用的弯沉盆面积指数法分析的基顶模量值最大高出实际值35%。针对弯沉盆面积指数wA与相对刚度半径l、相对刚度半径l与荷载中心处弯沉系数lw)(的理论关系存在矛盾、公式形式不合理等问题,基于弹性地基板理论对弯沉盆面积指数wA与相对刚度半径l、相对刚度半径l与荷载中心处弯沉系数lw)(之间的理论关系进行了数值计算和分析,修正了目前的我国经验公式。结果表明,修正后的弯沉盆面积指数法分析的基顶模量值最大误差为16.7%。(2)对HWD测试方法的可靠性进行了试验验证与分析。采用美国机场试验中心NAPTF公布的模型道面弯沉测试数据,对不同弯沉测试设备测试成果之间的差异范围进行了分析。主要包括冲击劲度模量ISM、接缝传荷能力、基层顶面反应模量三个方面,其波动范围分别为-13.7%~24.5%、-28.5%~10.9%、-44.5%~62%。然后结合实际机场道面弯沉测试数据,对导致弯沉测试的误差进行了系统分析,得到误差对冲击劲度模量ISM、接缝传荷能力、基层顶面反应模量三个方面的波动范围影响分别为-8.5%~33.9%、-21.8%~20.1%、-54.2%~51.2%。根据这两大因素对测试结果的影响,制定了均匀性定量评价指标。(3)为解决板边弯矩影响图法无法适用B777及A380系列等大型宽体客机的缺点,同时保持适合反复试算、原理简单、便于工程人员接受等优点,采用有限元方法分析了飞机总重量G、相对刚度半径l与板边弯矩的相关关系,在此基础上绘制了常见民航飞机的板边弯矩计算曲线。
[Abstract]:HWD (Heavy Weight Deflectometer) deflection test is the most important technical means to test and analyze the structural performance of airport pavement. Due to the short history of the introduction of HWD testing technology into China, especially in the field of civil aviation airports, there is a lack of systematic research on the theory and method of HWD testing and the reliability of test results, which have always been the focus of engineering and academic research. Based on the above background, the following work has been carried out in this paper: (1) the area index method of curved basin is analyzed theoretically, verified by experiments and modified. Based on the deflection test data of NAPTF (National Airport Pavement Test Facility) model in the United States, the bending basin area index method used at present in civil aviation airports in China is compared with four similar methods in the world. The results show that the base top modulus value analyzed by the bending basin area index method currently used in China is 35% higher than the actual value. In view of the contradiction between the bending basin area index wA and the relative stiffness radius l, the relative stiffness radius l and the bending settlement coefficient lw) (at the center of the load, and the unreasonable formula, the theoretical relationship between the bending basin area index wA and the relative stiffness radius l, the relative stiffness radius l and the deflection coefficient lw) (at the center of the load is calculated and analyzed based on the elastic foundation plate theory. The current empirical formula of our country has been revised. The results show that the maximum error of the base top modulus value of the modified deflection basin area index method is 16.7%. (2) the reliability of the HWD test method is verified and analyzed by experiments. Based on the deflection test data of model pavement published by NAPTF, the difference range of test results of different deflection test equipment is analyzed. The fluctuation ranges of impact stiffness modulus ISM, joint load transfer capacity and base top response modulus are-13.7% 24.5%, 28.5% 10.9% and 44.5% 62%, respectively. Then, combined with the actual airport pavement deflection test data, the error leading to the deflection test is systematically analyzed, and the influence of the error on the impact stiffness modulus ISM, joint load transfer capacity is obtained. The influence of the error on the impact stiffness modulus ISM, joint load transfer capacity is-8.5% 33.9%, 鈮，

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