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为了研究干旱地区黄土土基包气带内水分分布状态,依据非饱和渗流理论,研究了干旱地区黄土土基包气带内水分分布规律,得出了水分分布的理论规律,并用3个工程的实测数据验证了该理论规律。研究结果表明:干旱地区降雨量少且大气蒸发能力强,地下水位埋深超过6m时,土基中水分分布可近似处于稳定状态;非饱和渗流理论分析结果表明,正常毛细水带高度等于土基的进气值,包气带内土基的饱和度S与深度z呈幂指数关系;干旱地区的3个黄土工程实测值与包气带水分分布规律吻合度高,相关系数达到0.821~0.981,包气带水分分布规律适用于黄土原状土基和填土土基;依据3个工程实例得到水分分布规律参数α和β值,α在3.40~5.13m之间,β在-1.32~-1.08之间;研究成果能为干旱地区土基水分分布规律的进一步研究与黄土强度变形参数测试时含水量控制提供参考依据。
In order to study the distribution of water content in the loess bedded zone in arid areas, the distribution law of moisture in the embalzonized zone of loess in arid areas was studied based on the theory of unsaturated seepage. The theoretical law of the distribution of moisture was obtained. The measured data verify the theoretical rules. The results show that: the rainfall in arid areas is small and the evaporation capacity of the atmosphere is strong. When the groundwater table depth exceeds 6m, the water distribution in the soil foundation can be approximately in a steady state. The theoretical analysis of unsaturated seepage shows that the height of normal capillary water zone is equal to that of the foundation , And the saturation index S and depth z of expansive zone in aeration zone showed a power exponential relationship. The measured values of three loess projects in arid area were in good agreement with the distribution of moisture in the aeration zone, and the correlation coefficient reached 0.821-0.981, The law of moisture distribution in aeration zone is applicable to the original loess-like soil foundation and filling earth; According to three engineering examples, the parameters α and β of water distribution are obtained, α is between 3.40 and 5.13m, β between -1.32 and -1.08 The results of this study can provide reference for the further study on the law of soil moisture distribution in arid areas and the control of water content in loess strength and deformation parameters testing.