周边建筑对深基坑支护结构的影响分析

为研究城市高大建筑和市政设施等对深基坑支护结构的影响,以沈阳金融中心大厦深基坑工程为研究对象,研究了周边建筑荷载对在建深基坑支护结构稳定性的影响。通过现场监测,研究基坑水平和竖直位移变化规律,验证支护结构的有效性;利用大型有限元分析软件MIDAS/GTS为计算工具对基坑进行多次数值模拟,得到建筑物作用力、建筑距离等作用的改变与支护结构变形之间的关系。研究结果表明:当基坑周边存在建筑物时,基坑变形量明显加大;随着基坑周边建筑物作用力的增大,基坑变形量呈线性增加;在2倍基坑开挖深度范围内,建筑距离对基坑的影响呈幂级数增加,建筑物"细高"时对基坑的影响较大,"矮胖"时较小。上述研究成果对基坑支护结构方案的优化有一定的指导意义。

Effect of surrounding buildings on supporting structure of deep foundation pit

In order to research the effect of tall buildings and public service on supporting structures of deep foundation pit, the paper studied the influence of surrounding building loads on supporting structure stability of deep foundation pit by taking the deep foundation pit project of Asian Finance Building in Shenyang as the research object. It also researched the change law of vertical and horizontal displacement of supporting structures of deep foundation pit by means of field monitoring and verified the effectiveness of its supporting structure. The supporting structures of deep foundation pit were simulated many times by using finite element analysis software MIDAS/GTS and the relationship between parameters and deformation of supporting structures was summed up by changing the distance from the building etc. The research results show that the deformation of deep foundation has significantly increased when there are buildings around the foundation; the deformation value of the deep foundation pit increased linearly with the increase of buildings force surrounding deep foundation pit ; The impact of building distance on the deep foundation pit was increased power series in 2 times depth of excavation. The impact of fine and high building on deep foundation pit is larger than that of chunky building. The result can offer some guiding significance for optimization of supporting structural scheme of foundation pit.