多层支撑深基坑变形数值模拟正交试验设计研究

分析了多层支撑深基坑设计中的多个参数，对诸如挡墙和支撑的刚度指标等参数选取进行了分析。对深开挖进行了多因素多水平的有限元数值模拟，在此基础上进行了支撑刚度、位移柔度数、土体变性及强度参数等5因素的4水平正交试验设计，得出了深开挖中的各个参数对多层支撑深开挖变形的影响程度和各个参数的灵敏度。分析结果表明，墙体的位移柔度数是控制基坑开挖变形的主要参数，其他的参数诸如土体的弹性模量等对基坑变形的影响较小。

Orthogonal design study for numerical modeling of deformation of multipropped deep foundation pit

Some parameters in the design of multipropped deep foundation pit are analyzed;and the selection of flexibility parameters of prop and retaining wall is compared.Using FEM,an orthogonal design test of the excavation of deep foundation pit is carried out considering 4 levels of the prop stiffness,displacement flexibility number;elasticity modulus and so on,and the influences of these parameters on the excavation deformation are obtained.It is concluded that the displacement flexibility number of retaining wall is primary parameter which controls the deformation of foundation pit;other parameters,such as stiffness of soil,etc.,have little influence on deformation of deep excavation.