从长期沉降观测资料看反分析固结计算的误差趋向

根据实测沉降过程线推算最终沉降量S∞及固结参变量β是排水加固工程的常规分析方法,但国内研究其与实际值的差异及其误差趋向的文章并不多见。文中通过对有830 d沉降观测资料的某预压加固工程实例进行分析,得到了该工程主固结时间及相应的实际最终沉降量S∞,证明了固结度表达式Ut=1-αe-βt中的参变量β在固结过程中并非常数。分析结果表明,用＂三点法＂反分析计算最终沉降量S∞和参变量β在工程实际应用中是偏于安全的。

To See the Trend of Back Analysis of Consolidation Calculation from Long-term Settlement Observation Data

Based on the measurement of settling progress,calculating the final settlement S∞ and consolidation parameter β is a conventional analysis on drainage consolidation under stress can rarely see in papers about the errors between calculation and actual value of final settlement and consolidation parameter β in china.Through making an analysis of a real case of preloading consolidation project,which project is with settlement observation data for 830 d,it turns out to be found consolidation time and the final settlement S∞,it is proved that the parameter β in the expression of consolidation degree of Ut = 1-αe-β t is not a constant.The analysis result indicates that it is safer to calculate the final settlement S∞ and parameter β by＂three point＂back analysis method in practical application of projects.