Settlement prediction of stage constructed embankment on soft ground based on the geophysical method

摘要

Based on the validation of correctness of Biot consolidation theory with geophysical data, pre-construction and post-construction settlements of highway were simulated and calculated under the condition of actual embankment stage construction. The model-based analysis results indicate that: ① at the stages of embankment construction (Ⅰ), embankment settlement increases at first and then decreases with depth, but roadbed settlement decreases all along and its settlement outside is negative. After embankment construction ends (Ⅱ), the settlements of embankment and roadbed increase, but apophysis of roadbed outside decreases and then consolidates as time passes. The maximal settlement is 8.5 centimeter (cm); ②pore pressures of embankment and roadbed increase and have the maximal value (123MPa) in Ⅰ stage, but decreases in Ⅱ stage. The maximal point goes down to the bottom of roadbed in both stages; ③ lateral displacements of embankment and roadbed increase in Ⅰ stage. The lateral displacement of embankment is negative but it is positive of roadbed. The maximal lateral displacement is located at the outside bottom of roadbed. The lateral displacement of embankment increases continually in Ⅱ stage and has the relative big value at slope. The lateral displacement of roadbed turns from positive to negative with depth as time passes; ④consolidation settlement of highway attains steady state for one year and the lateral deformation achieves maximum.