上海港外高桥港区地基处理后堆场沉降

Yard settlement after ground treatment in Shanghai Port Waigaoqiao Port Area

考虑因软黏土的流变而产生的次固结沉降问题,结合Singh-Mitchell蠕变模型和双曲线型应力-应变模型得到上海淤泥质黏土的Mesri蠕变模型型式,该模型能较好地模拟上海地区软土在任意剪应力水平下的流变特性。基于现场的工后沉降测试和分层沉降数据,可知用该模型所得的计算值和实测值基本吻合。并进一步运用观测资料的回归分析法对现场工后沉降实测结果进行了拟合,得出了场地工后沉降的经验公式,该经验公式可用于类似地质条件下工程的沉降预测;得到了一些有益的结论,对类似工程有一定的借鉴意义。

Considering the secondary consolidation settlement problem caused by the evolution of soft clay, combining with the Singh-Mitchell creep model and the hyperbolic type of stress-strain model, Mesri creep model type of Shanghai silty clay is obtained, which can better simulate the rheological behavior of Shanghai soft soil at any shear concluded that the stress level. Based on the settlement calculated value and measured value after construction and stratified settlement is basically the same. Furthermore, using the the spot settlement from the regression analysis of the observation data, an empirical formula of data, it is results of the post- construction settlement is obtained; the empirical geological conditions. Some useful conclusions may formula can predict the settlement under similar engineering serve as references for similar engineerings.