| In recent years, high-speed railway in China has been rapid development. However, it will create many high fill embankment slope and excavation of the cutting slope in the mountain when built high-speed railway. Rainfall will have a huge impact on the stability of the natural slope and the retaining slope, according to statistics, more than90%of the landslide caused by rainfall. Therefore, it is of great significance for high-speed rail operations safety of the bedding rock slope stability under the rainfall conditions.The thesis is based on the operational safety of the key scientific research projects of the Ministry of Railways-High and Steep Slope Disaster Prevention and Monitoring and Alarm System Technology (2010G018-E-4). Used of two-dimensional numerical analysis software Midas-GTS rainfall analysis model to study the internal pore water pressure variation and the slope deformation law under rainfall condition. Set the K307workers point of Gui-Guang high-speed railway as the prototype to create the indoor rainfall model test. Create the indoor large-scale rainfall physical model test based on the mixture ratio test to explore the variation law of the pore water pressure volumetric water content, slope deformation variation in the process of rainfall with rainfall time. Research the variation law of the retaining structure stress, strain of supported retaining structure slope. The main results of the paper are as follows:1. Using Midas-GTS software to establish the rainfall analysis model. Obtained in the process of rainfall infiltration, the negative pore water pressure of the slope increased with the increases of duration and intensity of the rainfall. There are some transient saturated zones near the surface of the slope, and the stability of the slope reduced. The displacement of the slope is increased with the increase of rainfall intensity. The slope will failure along the soft clamp level slippage-tensile in the condition of rainfall.2. We obtained the physical similarity criterion through the analysis of similarity theory of elastic mechanics, the equilibrium differential equation, the physical equation, geometrical equations, boundary conditions and kinematics, hydraulics basic theory.3. The similar materials of the rock mass and weak interlayer which can meet the test requirements was determined. The optimum mix ratio of the similar material and the relationship of similar material content and similar rock correlations between physical and mechanical parameters of soft interlayer obtained through lots of mix ratio test. based on the research on similar material, better simulate the weak dissection of the similar material mixture ratio was determined, and through direct shear test of weak interlayer material similar, the influence of each component on sandwich properties was acquire; weak intercalation intensity parameter variation in the different moisture content condition was explored.4. The modeling methods, the collected data, acquisition means and acquisition theory were described. Slope displacement sensor satisfied the test requirements of was designed. Through indoor bedding rock slope rainfall model test, pore water pressure and slope displacement of natural slope and retaining structure slope during rainfall of weak interlayer water was obtained. Through the rainfall model test of the retaining structures of slope anchor frame beam and anti-slide pile internal force was achieved. The axial force of the anchor cable was measured by through the bare fiber Bragg grating. |
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