高层建筑群对地面沉降影响的模型试验研究

Model Test Study of Influence of High-Rise Building on Ground Subsidence

通过室内模型试验,研究了上海地区典型地质条件下高层建筑群工程环境效应对地面沉降的影响,探讨了在高层建筑群工程环境效应作用下不同土层的变形特点、相邻建筑物之间的相互影响状况、高层建筑群对中心及周边区域地面沉降的影响以及沉降影响范围、土层中应力(包括土压力、孔隙水压力)的变化规律等.试验研究结果表明:上海软土层是地面沉降的主要组成部分;高层建筑群工程环境效应造成的城区地面沉降的特点是距建筑物1倍基础宽度范围内的地面沉降大于建筑本身的沉降,尤以相邻建筑之间中心区域地表的沉降量最大;密集高层建筑群之间地表变形存在明显的沉降叠加效应,并使沉降量超过容许值,从而带来不稳定因素.

Based on a model test, the engineering-environment effect of high-rise building group area on ground subsidence is discussed under the typical geological condition in Shanghai. The paper discusses the problems including the deformation characteristic of different soil layers, the mutual influence of adjacent buildings, the influence of high-rise building groups on ground subsidence of central and circumjacent area, the ground subsidence range and the change rule of stress in soil layer（ including soil pressure, pore pressure） due to the high-rise building group engineering-environmental effect. Soft soil layer is the main eomponent of the ground subsidence in Shanghai. The ground subsidence around the building in one time foundation breadth range is larger than that of building itself, and the subsidence of the central area is the largest. The stress superimposition effect is obvious in ground deformation caused by dense high-rise buildings. As a result, the subsidence exceeds allowance and may cause trouble.