高填方地基蠕变沉降计算方法研究

STUDY OF CREEP SETTLEMENT COMPUTATION METHODS FOR HIGH EMBANKMENTS

高填方地基的工后蠕变沉降计算是判断其沉降稳定与否的重要方法,也是安排后续施工的重要依据。针对通过有限沉降观测数据进行沉降预报的问题,提出高填方蠕变沉降实用计算方法。为进一步论证该方法的合理性与实用性,结合承德机场的工后沉降监测数据对蠕变实用算法进行深入分析。然后为检验该方法的优越性,分别以承德机场和陕西某黄土高填方地基为例比较了所提出方法和三点法、星野法及双曲线法的计算结果。结果表明:蠕变实用算法在已知有限数据的情况下可以更好地预测有限时间内高填方的蠕变沉降。

Computation of post-construction creep settlement is important in judging whether the settlement reaches its stability in high embankments. It is also an important basis for the arrangement of following constructions. To solve the problems in predicting settlement when the observed data is limited,it was proposed a practical creep deformation computation method for high embankments（ practical creep computation method）. To further discuss the justifiability and practicability of the practical creep computation method,monitoring data in Chengde Airport was used in deep analysis of the method. Next,computation was conducted using limited monitoring data in Chengde Airport and a loess embankment in Shaanxi to examine the excellence of the practical creep deformation computation method for high embankments. The results were compared with the results of 2 other computation methods. It was shown that practical creep computation method could better predict the creep settlement of high embankments in a period of time after construction with a small number of settlement data known.