強降雨觸發(fā)淺層黃土滑坡的水文作用機制研究
[Abstract]:Slope stability is a frequently studied engineering geological problem in engineering construction. Loess is a special soil with water sensitivity. China's loess is famous for its wide distribution, continuous, complete stratum and large thickness. In the Loess Plateau region, the loess landslide has brought serious harm to the people's life and property safety in this area. It is of great significance to study the hydrological mechanism of the loess landslide under the condition of rainfall for the study of the mechanism and early warning of the shallow loess landslide. In this paper, the hydrologic process of loess slope under natural and artificial rainfall is monitored synthetically by means of artificial slicing in typical loess distribution area of Jingyang, Shaanxi Province, by means of water content meter, tension meter, rainfall meter and other instruments, and the hydrologic process of loess slope under natural and artificial rainfall conditions is monitored comprehensively. The stability of the slope is analyzed by laboratory test and numerical calculation. The main contents of this paper are as follows: (1) the actual rainfall of natural and artificial rainfall is obtained by the rainfall meter placed on the artificial slope, and the actual rainfall is obtained by the platform on the slope. The changes of moisture and matrix suction at different depths were obtained by the water meter and tensimeter embedded at the slope surface and the foot of the slope. The hydrologic process of loess slope under natural and artificial rainfall conditions and the soil-water characteristic curves of undisturbed soil at various depths are obtained. (2) the basic physical and hydraulic properties of undisturbed soil are studied by experiments. The basic parameters such as soil density, water cut and permeability are obtained, and the soil water characteristic parameter curve and permeability coefficient curve are obtained based on the field monitoring data. And compared with the soil water characteristic curves obtained in the laboratory. (3) through the direct shear test under the condition of natural and saturated moisture content of undisturbed soil with different depth, the shear strength parameters under two different water content conditions were obtained. According to the soil-water characteristic curve and the shear strength index of soil under saturated water content, the shear strength under different water content is estimated. (4) the Rain Water infiltration law and slope stability of loess slope are calculated and analyzed by Geostudio2007.
【學(xué)位授予單位】:華北水利水電大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P642.22
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