鲁地拉水电站枯木A滑坡降雨入渗非饱和渗流分析

发布时间：2018-05-04 21:53

本文选题：边坡 + 降雨入渗　；参考：《天津大学》2014年硕士论文

【摘要】：边坡失稳引起滑坡是全球性的地质灾害之一，对人类社会和经济建设构成巨大危害，降雨是引起边坡稳定性降低，导致边坡失稳的最主要和最普遍的外界因素，降雨类型的滑坡约占滑坡总数的70％，而且降雨类型的滑坡中95％的滑坡发生在雨季。可见研究降雨入渗对边坡地下水位及土体饱和度的影响，是边坡稳定性研究的重要内容。论文首先介绍了非饱和渗流的基本概念、基本微分方程以及饱和—非饱和渗流的有限元解法。其次，以一个理想土坡模型为对象，研究了降雨量、土体渗透系数、基质吸力、土水特征曲线（渗透系数与基质吸力关系曲线、体积含水量与基质吸力关系曲线）等参数对入渗结果的影响。降雨条件下土体中的浸润线有单线和双线两种形式，浸润线的形式是土体渗透系数、降雨量、降雨持时、孔隙比、基质吸力以及边坡几何尺寸的多元函数，当降雨量小、渗透系数大、降雨持时短、基质吸力小、边坡高度低时，浸润线易呈单线形式，，相反则易呈双线形式。然后，分析了鲁地拉水电站枯木A滑坡区的工程地质条件、滑坡的形态及规模、滑坡的边界特征、滑坡的结构特征、滑坡的变形破坏特征及形成机制。在此基础上，以滑坡体中的天然稳定水位线为判据，以设计基础参数为初值，反演分析了枯木A滑坡堆积体非饱和土力学参数，包括基质吸力与饱和度的关系，饱和度与相对渗透系数的关系；以反演参数为依据，研究了滑坡体原始地下水位线分布；研究了天然河水位和正常蓄水位在无、有渗控措施（排水洞+上仰排水孔）条件下，滑坡体内地下水位线、非饱和区含水量、孔隙水压力等的变化规律，指出该边坡处于欠稳定状态，必须进行工程治理；排水洞+上仰排水孔工程治理措施是有效的，对于饱和度和含水量虽有很大减小，但对于降低非饱和区的饱和度和含水量效果有限。
[Abstract]:Slope instability caused by landslide is one of the global geological disasters, which constitutes a great harm to human society and economic construction. Rainfall is the most important and universal external factor causing slope stability reduction and slope instability. The rainfall type landslides account for about 70% of the total number of landslides, and 95% of the landslides in the rainfall type landslides. In the rainy season, we can see that the influence of rainfall infiltration on groundwater level and soil saturation is an important part of slope stability research.
The basic concept of unsaturated seepage, basic differential equation and finite element method for saturated unsaturated seepage are introduced. Secondly, the rainfall, soil permeability coefficient, matrix suction, soil water characteristic curve (relation curve of permeability coefficient and matrix suction, volume water content and matrix) are studied. The infiltration line in the soil has two forms of single and double lines, and the infiltration line is the coefficient of soil permeability, rainfall, rainfall holding, pore ratio, matrix suction and the geometric dimensions of the slope, when the rainfall is small, the permeability coefficient is large, the rain holding is short, matrix is short. When the suction is small and the height of the slope is low, the infiltration line is easy to form a single line, but on the contrary, it is prone to double line form. Then, the engineering geological conditions, the shape and scale of the landslides, the boundary characteristics of landslides, the structural characteristics of landslides, the characteristics of the landslide and the formation mechanism of the landslide are analyzed. On the basis of this, the landslide body is made. The natural stable water level line is considered as the criterion, and the basic parameters are designed as the initial value. The mechanical parameters of unsaturated soil in the A landslide accumulation body of the dead wood are analyzed, including the relationship between the base suction and saturation, the relation of saturation to the relative permeability coefficient, and the distribution of the original groundwater level line of the landslide body is studied based on the inversion parameters, and the days of the study are studied. However, the water level of the river and the normal water level are not. Under the conditions of seepage control (drainage hole + upside drainage hole), the groundwater level line, water content in unsaturated zone, pore water pressure and so on in the landslide, point out that the slope is in the under stable state and must be treated by engineering, and the treatment measures of drainage hole + upside drainage hole are effective, Although saturation and water content decrease greatly, the effect of reducing saturation and water content in unsaturated zone is limited.

【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV223.4

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