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降雨入渗条件下土壤非饱和特性研究(孙元元)

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降雨入渗条件下土壤非饱和特性研究水利论文!_2tf&{;\uT D$Db

t*X8m'AQyz0【作者】孙元元 【导师】陶同康; 李定方水利论文!Q&@"A F9QZ$C
【作者基本信息】南京水利科学研究院,水力学及河流动力学,2006年,硕士水利论文&na1V nR t|

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【中文摘要】 滑坡是主要的地质灾害之一,因其作用因素及运动机理多变且复杂,预测比较困难,一直是世界各国研究的重要工程问题之一。近年来,降雨所导致的边坡失稳越来越频繁,引起了越来越多专家学者的重视。降雨引起边坡失稳的主要原因在于降雨入渗改变了边坡土壤的非饱和特性,从而改变了整个渗流场,使得边坡的稳定性发生变化。因此,对于降雨入渗条件下土壤非饱和特性变化的研究具有十分重要的意义。 本文阐述了非饱和土中的流动规律和土—水特征曲线的特征及其应用,分别以含水量和毛细水头为未知量推导了非饱和渗流的控制方程。阐述了降雨入渗的理论,建立降雨入渗条件下的蓄满产流模式数学概化模型,提出了降雨入渗边界条件的处理方法,以及初始条件的概化。 用基于Gardner的假定的含水层无限深度的土壤所导出在非恒定降雨入渗条件下的理论解,和对含水层深度有限的土壤在非恒定降雨入渗条件下进行数值解,对不同的土壤在各种的非恒定降雨入渗条件下分别编制程序模拟,并分析比较,从而得出土壤非饱和特性随非恒定降雨入渗强度、含水层的情况以及土壤物理特性的变化规律。 为了深入研究降雨入渗条件下土壤非饱和特性,文中对恒定降雨有限含水层深度的土壤在垂直和水平入...更多渗条件下进行数值解,研究了不同的土壤在不同的恒定降雨入渗条件下土壤非饱和特性,通过比较分析,不仅得出重力对土壤入渗的影响,而且得出土壤的非饱和特性的变化随恒定降雨入渗强度、含水层深度(厚度)以及土壤物理特性的变化规律。 通过本文的研究,初步分析探讨了土壤非饱和特性在不同降雨入渗条件下的变化规律,并得出含水层情况、降雨入渗强度、土壤物理特性以及重力的有无等对其变化的影响,具有一定的理论意义。  还原

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$s"Ig dc%m)\0【英文摘要】 Landslide is one of the important geological hazards, for its factors and mechanism are variable and complex, it is difficult to be predicted, and it have been under research over the world. Recently, landslide that induced by rainfall become more and more, it result in regard of more and more expert and scholar. The main reason that rainfall induce landslide is rainfall and infiltration change the soil's unsaturated character and the whole seepage field, make the land's stabilization change. Therefore, Research to change of soil's unsaturated character under rainfall and infiltration is very important.The rule about water flow in unsaturated soil and the soil-water characteristic curve are described in this papsr, and it respectively regards moisture content and capillarity head as basic variable to deduce unsaturated seepage control equation. It sets up mathematics general model under rainfall and seepage, puts forward manage method of boundary condition and initial condition.It uses...更多 the theoretic solution to the soil whose aquifer depth is infinite under unsteady rainfall seepage which based on Gardner's hypothesis, and the numerical solution to the soil whose aquifer depth is finite under the same condition, it develops program to model different soil under different intensity unsteady rainfall seepage, and gets soil unsaturated character change rule with unsteady rainfall intensity, aquifer condition and soil physical character by analysis and compare.For studying deeply soil unsaturated character under rainfall seepage, numerical solution to the soil whose aquifer depth is .finite under steady vertical and horizontal rainfall seepage is in the paper, it study different soil unsaturated character under different steady rainfall seepage, and gets not only gravity's influence to soil seepage but also soil unsaturated character change rule with steady rainfall intensity, aquifer depth(thickness) and soil physical character by analysis and compare.In the paper, soil unsaturated character's change rule under different rainfall seepage is discussed, and the influence to its change of aquifer condition, rainfall seepage intensity, soil physical character and gravity's exist is get, so it has certain theoretic significance.  还原

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【中文关键词】 降雨入渗; 基质吸力; 土-水特征曲线; 非饱和渗流; 有限差分
d o/?6h j mc0【英文关键词】 rainfall seepage; matric suction; soil water characteristic curve; unsaturated seepage; finite difference method水利论文fugTpg

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TAG: 非饱和 入渗 特性 孙元元 土壤
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