【作者】 王丽；

【导师】 李海龙；

【作者基本信息】 辽宁师范大学 ， 应用数学， 2009， 硕士

【摘要】 本文研究了临海包气带中由海潮波动引起的一维气流.所考察的包气带系统由三层构成:上层和中间层为非饱和半渗透层,且上层很薄,渗透性比中间层低;下层具有良好的透水性,潜水面位于其中.我们建立了描述此系统的非线性气水两相流模型,然后通过对模型的线性化假设,推导出地下一维垂直气流气压波动的解析解,并且论证了该解析解的正确性和适用性.利用该解析解,分析解释了香港国际机场沥青路面下由海潮引起的气压波动,并且说明了雨水入渗会使表层路面空气渗透系数减小,从而会产生异常大的气压,导致沥青路面的拱起和破坏.更多还原

【Abstract】 This paper investigated one-dimensional subsurface vertical airflow induced by the sea tide fluctuation in a coastal unsaturated zone. The system consists of three layers. The upper and the middle layers are unsaturated and semi-permeable. The upper layer is thin and much less permeable than the middle layer, while the lower layer is very permeable. Water table is located in the lower layer. The original nonlinear model of air-water two-phase flow was built firstly. Then model was linearized based on some reasonable assumptions, and finally the analytical solution to the model was derived to describe the air pressure fluctuation. The analytical solution was used to analyze the relation between the tide-induced air pressure fluctuation and the hydraulic head fluctuation below the asphalt pavement at Hong Kong International Airport. It was found that abnormally high air pressure can be caused beneath the surface pavement when its air permeability decreases due to rainfall infiltration, which may lead to heaving problem.更多还原