上海软土地区多层建筑物长期沉降特性

通过对50幢多层建筑沉降观测资料的分析，研究了上海软土地区多层建筑的长期沉降。对竣工以后的观测数据采用指数模型进行回归分析，可以反映软黏土的流变特性，较好地模拟建筑物后期的沉降发展过程，从而预测得到最终沉降量和沉降稳定时间。根据指数模型的分析结果，并引入地基压缩层内的软黏土厚度所占比例的概念，研究了多层建筑长期沉降与地基土层特性的关系。结果表明，最终沉降和沉降持续时间随着软黏土厚度比例的增加而增大，竣工时沉降占总沉降的比例随着软黏土厚度比例的增大而下降，并且具有线性关系。

Long-term settlement of multi-story buildings on soft clay foundation in Shanghai

The long-term settlement behavior of multi-story buildings on soft clay foundation in Shanghai is analyzed based on the long-term observed data of 50 multi-story buildings.Exponential model can reflect creep deformation of soft clay,which has obvious physical meaning of rheology.The long-term settlement of building is simulated well by analyzing the observed settlements after construction with the exponential model;and the final settlement and settlement duration are predicted.Considering the variation of thickness ratio(Ks) of very soft clay layers in the four types of subsoil,relationship between Ks and long-term settlement of building is obtained from analysis of all records.With the increase of Ks,the final settlement and settlement duration increase,while the ratio of settlement finished during construction is decreasing.