关键词: 软土路基, 后期沉降, 推算方法, 误差

Abstract: Seven methods of calculating the post-construction settlement for soft soil embankment are introduced; and the prediction accuracy of each method is analyzed based on actual measuring settlements. For each prediction method, the influences of calculation starting time and time span on the accuracy are studied; and each method’s advantages and applicability are analyzed. The research results show that hyperbola method and exponent curve method’s predicting errors are larger, after three months’ permanent load as the time starting point is proposed; a longer period of settlement data prediction can effectively improve predicting accuracy. Three-point method’s, settlement rate method’s and Hushino method’s predicting precisions are higher, and the calculation starting point and time span do not have much relation, but require special treatment to the original observation data , the calculation is more complex. The predicting results of Asaoka method is closest to truth value; its shortcoming is unable to predict the settlement which after a certain stage of stop load-on.

Key words: soft ground, post-construction settlement, prediction method, calculation error