中文摘要：

随着城市规模的发展，密集建筑群所引起的工程性地面沉降问题越来越引起重视。借助离心模型试验手段，探讨建筑容积率因素对上海软土地区密集建筑群区工程性地面沉降的影响规律。试验结果表明：软土地层沉降是工程性地面沉降的主要组成部分，地层及区域各点随时间的沉降变化量均符合指数函数关系；密集建筑群区的地面沉降存在明显的叠加效应，并随建筑容积率的增大呈增加趋势；在试验指定的建筑容积率下，地面沉降的叠加效应存在明显的时间效应；建筑容积率需控制在一定的范围内，以防止地面沉降超过其容许沉降量，而成为引起城市环境问题的不稳定因素。

英文摘要：

With the development of city scale, engineering land subsidence caused by dense buildings has been paid more and more attention to. According to different floor area ratios, the rule of engineering land subsidence caused by dense buildings in soft soil area of Shanghai is discussed by means of centrifugal model test. Results show that the subsidence of soft soil layers is a main component of land subsidence. The subsidence variation with time of strata and regional points accords with exponential function. The superimposition effect of dense buildings on land subsidence is obvious and increases with the floor area ratios. In a certain floor area ratio, the superimposition effect of land subsidence has a significant time effect. The floor area ratio should be controlled in a certain extent to prevent land subsidence exceeding allowable value, which will cause instability of urban environment.