Stability analysis of geosynthetics-reinforced soil retaining wall subjecting to the footing load at the top surface
In order to study the performance of the geosynthetics-reinforced soil(GRS)retaining wall subjecting to the footing load at the top surface,the shear strength reduction(SSR)method based on finite element was used to calculate the safety factor of stability and the reliability of results was verified by the model tests.Furthermore,a series of stability analysis were carried out to analyze the effect of width and offset distance of footing,shear strength index of back-fills,layout of reinforcement and wall height H on the stability and failure mode of GRS walls.The calculated results show that the safety factors of stability are related closely with width and offset distance of footing,and the bearing capacity of the footing and the stability of GRS walls can reach the best when the footing with the width of 0.2H is located at the middle of the reinforced zone at the top surface of wall.In addition,to increase the shear strength index or reduce the vertical spacing of reinforcement can improve significantly the stability of GRS walls,and when the length of reinforcement is greater than 0.7H,the bearing capacity of GRS walls is insensitive to the change of reinforcement length.Finally,there are two main failure modes for GRS walls subjecting to footing load at the top surface,that is,shallow failure of the foot-ing,and the potential slip surface formed through the edge of footing and the wall facing panels.
万方数据
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