Based on the indoor physical scale model test,this paper studies the subgrade foundation loading failure test under the conditions of different layers,width and buried depth of the first layer of soilbags.By analyzing the distribution of cracks on the slope surface of the subgrade foundation and the crack rate,the load-settlement relationship curve,as well as the distribution law of the internal earth pressure in the subgrade foundation along the horizontal direction and the vertical direction,the paper studies the influence and law of the number of layers,width and buried depth of the first layer of soilbags on the reinforcement effect of the subgrade foundation.The results show that the soilbags have a significant impact on the distribution of the internal earth pressure of the foundation,and the greater the load,the more obvious the reinforcement effect of the soilbags;the more layers and the larger the width of soilbags,the better the effect of subgrade foundation reinforcement,but it is not the case under the condition of ensuring economic cost;the closer the top soilbag is to the loading plate,the more beneficial it is to control the settlement of the subgrade foundation,but not to control the development of cracks.Therefore,it is suggested that a certain buried depth of the first layer should be appropriately reserved in the actual project to facilitate the control of the development of cracks.
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