深基坑变形影响因素的正交分析

随着基坑向大、深方向发展,对变形控制也越来越严格,深基坑变形已成为基坑设计中的首要因素。综合深基坑设计中影响变形的多个常见因素,在单因素影响基坑变形基础上,进行了多因素组合下的8个因素4个水平的正交设计,分别对地面沉降、建筑物基础沉降差、围护结构水平位移、基坑隆起值4个指标进行考察,研究各因素的敏感性大小和显著性分析。分析结果表明,支撑间距、土体变形模量、开挖深度是基坑设计中较为重要的因素,其他因素对深基坑变形影响较小。

Orthogonal experimental analysis for influencing factors of deep excavation deformation

With the excavations developing for deep and large, the control of the excavations deforma- tion become very stringent and the deformation control of excavation have became the primary factor in excavations design. This paper has analyzed muti - factors in excavations＇ design basing on the single - factor, an orthogonal design test of excavation deformation is carried out considering 8 factors and 4 levels in FEM simulation. Analysis of 4 indexes of the ground settlement, foundation settlement dis- parity, maximal lateral displacement of wall and upheaval in the bottom of the excavation are made, discussing the sensitivity and eminence of these factors. It is concluded that the strut distance, exca- vation depth and the soil stiffness are the main parameters which control the excavations deformation, while other parameters have little influence on excavations deformation.