Large deformation analysis of vibratory probe compaction process of loess foundations based on particle finite element method
A numerical simulation of the large deformation process of sandy loess foundation reinforced by the vibratory probe compaction method was conducted using the particle finite element method(PFEM)combined with the constitutive model of structured soil.The distribution rules of displacement field,stress field,velocity field and plastic body strain of surrounding soil during the process of the probe penetration were analyzed.The mechanism of deep vibratory compaction of sandy loess foundation was revealed.The results show that the trend of the peak value of the ground vertical vibration velocity obtained from the field measurement is consist-ent with that from numerical simulation,which verifies the reliability of the PFEM.The vertically excited probe can cause the changes of displacement field,stress field and velocity field in the vertical and horizontal directions of soil.The soil in the horizontal direction within 5R(R represents the radius of the vibratory probe)expands outward in a half shuttle shape and tends to compact,while the horizontal stress increases sig-nificantly and produces a preloading effect on the soil.Using the plastic body strain as the evaluation criterion of the reinforcement range,the results show that the radial reinforcement range of the soil increases slightly with the increase of the penetration depth of the probe,and the maximum radial reinforcement range is about 3.2R,and 1R-2R below the bottom of the probe also has the compacting effect.
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