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The mechanism of rainfall-induced landslides and abroad has always been academics, engineering is an important topic of great concern. Landslide burst loose sand to human life and property caused significant damage, so the landslide-induced factors such studies to reveal its landslide mechanism, to control or predict rainfall-induced landslides such geological disasters has important practical significance. Affect slope stability by many factors, this paper studied the slope model tests only the thickness of two factors on the rainfall intensity and loose sand slope stability, both model tests as the prototype, using numerical analysis of its on loose sand slope stability. First, the characteristics for this test was developed to meet the test requirements of rainfall systems and improved in the past for small model test monitoring systems; Then, by four model test, when compared hold rainfall, pore water pressure changes, slope Turkey displacement and the destruction of forms, analyze slope thickness and rainfall intensity on loose sand slope stability. Studies show: loose sand slope under rainfall in strong static liquefaction may occur, resulting in a sudden slope landslide; rainfall conditions, rainfall intensity, the greater the soil pore water pressure changes sooner, the greater the change soil displacement, while Slope stability decreases the faster, more prone to static liquefaction; Meanwhile, the thicker the soil, the soil pore water pressure changes faster, although its initial displacement is small, but as the rain continued, the displacement will vary growing thick slope, slope stability decreases the faster, the more prone to static liquefaction. Loose sand on the slope, the continuous rainfall, the rainfall greater, may make the situation more severe rain erosion, slope will reduce the likelihood of sudden instability; same condition, if not severely affected by rain erosion, then rain the greater the likelihood of occurrence of static liquefaction increases. Finally, according to the model used in the test characteristics of sand through the SEEP / W and SLOPE / W combination of analysis, comparing the rainfall duration, rainfall intensity in thickness and slope during rainfall on slope stability safety factor, the results showed that: the same rainfall intensity, rainfall same time, the thicker the slope safety factor slower decline in the later; slope at the same thickness, the same time rainfall, rainfall intensity, the greater the safety factor decreased faster.
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