Response Difference of Aeolian Sand and Gravel Soil Low Embankment under Vehicle Loading

Aeolian sand and gravel soil are commonly used as subgrade fillers in oasis-desert area of Xinjiang. In order to find out the difference of stress and strain response of low embankment of aeolian sand and gravel soil under vehicle loading, 1:1 full scale models of low embankment were established by using aeolian sand and gravel soil as subgrade fillers, and the model tests of low embankment under static load, short-term dynamic load and long-term dynamic load were carried out with the foundation moisture content of 18%, 23% and 28% respectively. The test results show that the stress and strain of low embankment are the largest under long-term dynamic load, and the minimum under short-term dynamic load. Under static load, short-term dynamic load and long-term dynamic load, the stress of gravel soil and aeolian sand low embankment decreases with the increase of depth, and the attenuation speed of gravel soil low embankment is faster. There is a dividing point in the stress response at 0.6~1.0 m from the top of the subgrade. The stress of the gravel soil low embankment from the top of the subgrade to the dividing point is greater than that of the aeolian sand low embankment, and the stress of the aeolian sand low embankment below the dividing point is greater than that of the gravel soil low embankment. The strain of each structural layer of gravel soil low embankment is smaller than that of aeolian sand low embankment. With the increase of foundation moisture content, the strain of aeolian sand low embankment foundation increases greatly.