Research On The Stability Of Seasonal Seepage Slope

The stability analysis of slopes is one of the significant projects in Geotechnical engineering world. It is related to many factors, such as geological structure, character of the rock and soil, construction disturbance, groundwarter, and so on, of which grougwater is one of the most main factors. In view of this, the paper takes the Wangjianglin slope as a backing. Based on the widespread collection of local hydrogeologic data and method of in-situ monitoring combined with numerical simulation, the stability of the slope in groundwater seepage has been evaluated. The following results have been obtained:1. Common principle of the monitor systems design and application has been proposed. The monitor system has been designed based on the characters of the Wangjianglin slope, and acquires relevant data. Then by analyzing the data, three mayor factors, infiltration of the rainfall, outer load and construction perturbation have been found to cause the slope local displacement very large.2. The paper sets up 3-D numerical model of Wangjianglin slope, then it utilizes FLAC3D to calculate fluid-solid coupling model, finally it compares the displacement in rainy season with that in dry season .The results indicate the displacement in rainy season is over twice as large as that in dry season, and that the stability in rainy season is poorer. From the results, the place where the largest displacement happens has been found and the largest displacement has been calculated. The global stability of the slope has been also analyzed.3. By analyzing the model and the data, it shows the rainfall is the main induced factor bringing on the slope instability. The infiltration of rainwater makes saturation of the slope soil increase, and the water produces dynamic hydropower in course of the seepage. That changes the stress in the soil, which causes the change of soil displacement.4. Through in-situ monitoring and numerical simulation analyzing, it plays a very key role to provide theoretical basis and data support for the slope dynamic design and construction which ensure slope construction smoothly.