考虑降雨影响的框锚支护结构稳定性动态分析

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Abstract Abstract：Research purposes： The existing overall stability analysis methods of grillage flexible supporting structure with prestressed anchors （referred to as "frame supporting structure with prestressed anchors "）have not considered the effect of rainfall infiltration. In order to explore influence rule of the rainfall infiltration on grillage flexible supporting structure with prestressed anchors, based on the GeoStudio software, the soil-water characteristic curve and coefficient of permeability characteristic curve of the unsaturated loess are fitted with the Van Genuchten model, then unsaturated loess slope seepage field under the condition of rainfall is simulated. The strength of loess is determined by means of unsaturated soil strength theory. A method to calculate the ultimate extraction bearing capacity of the friction type routing anchor with different soil water content is raised, and the dynamic stability of grillage flexible supporting structure with prestressed anchors under the condition of rainfall infiltration is analyzed. Research conclusions：(1) The frictional resistance of the anchor and the ultimate extraction bearing capacity of the anchor decrease rapidly with the increase of soil water content. (2) Effect of rain infiltration on the bearing capacity of the anchor is obvious when rainfall duration exceeds 12h. (3) Considering or not considering effects of moisture content on the frictional resistance of the anchor, the differences of slope safety coefficient are large. (4) The influence of rainfall infiltration on stability of grillage flexible supporting structure with prestressed anchors can not be ignored, the influence of moisture content on the ultimate extraction bearing capacity of the anchor should be considered. (5) The research results can be the guidance of the design and construction of grillage flexible supporting structure with prestressed anchors considering the influence of rainfall in unsaturated loess area.

Key words： Key words: unsaturated soil rainfall infiltration grillage flexible supporting structure with prestressed anchors dynamic stability analysis

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2015/V32/I5/23

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