高速公路地基沉降反演分析

基于竖向排水体饱和土地基固结理论解答,提出了考虑地基排水井加固区下卧层修正的路堤沉降数据反演地基固结特性的计算方法.比较了室内实验数据与对应现场反演计算参数,得出了反演分析固结系数相对高出室内固结试验成果1～2个数量级.运用这一成果,预测路堤中线下地基固结沉降历时曲线与实测沉降曲线很好吻合.因此,反演计算分析得到的海相沉积土的固结系数相对室内固结试验数据更加合理.

Back-calculation of ground settlement for freeway

Based on the theoretical solution for vertical drain consolidation, an approach of the backanalysis of the test embankments to evaluate the field consolidation behaviour is proposed, in which the consolidation affected by underlying stratum below the subsoil improved with prefabricated vertical drains is modified. Then a comparision is made between coefficient of consolidation measured in the laboratory and corresponding back-calculated field values of the parameters, and from which the coefficient of consolidation for the sandy loams derived from the back-calculated approach is 1 -2 magnitude greater than that measured in the laboratory. The back-calculated results are further used to predict the settlement versus time curves under the embankment centerline which coincides well with those measured in field. Therefore it is believed that the coefficient of consoildation for natural marine soils derived from back-calculation is more rational than that measured in the laboratory