格形地下连续墙基坑施工阶段侧向变形

为获得格形地下连续墙受力和变形的一般规律,结合实际工程,采用离心模型试验和现场监测方法对其侧向变形规律、设计参数对墙体位移的影响、围护结构最大侧向位移与开挖深度的关系进行了分析.结果表明:墙顶水平位移较大,墙体发生重力式位移模式;前后墙的变形规律相似,开挖深度、前后墙间距、隔墙间距、土质和临时支撑对墙体位移有显著影响;与拉锚地下连续墙相比,格形地下连续墙整体刚度大,抗水平变形能力强,最大侧向位移(平均值)为开挖深度的0.15%~0.50%,满足软土地区深基坑变形的基本要求. 

Lateral Deformation of Cellular Diaphragm Wall at Excavation Stage

To get the general rules of stress and deformation of cellular diaphragm wall, a centrifugal model test and field monitoring were made to analyze the lateral deformation rule, effects of design parameters on wall deformation, and relationship between maximum lateral displacement and excavation depth. The research results show that horizontal displacement of wall top is large and gravitated, and front and back walls have a similar deformation rule. Excavation depth, front and rear walls' spacing, partition wall spacing, soil property and temporary bracing have great effects on the horizontal displacement. Compared with anchored diaphragm wall, cellular diaphragm wall has large and strong integral rigidity and resistance, its maximum lateral displacement is on average about 0.15% to 0.5% of excavation depth, meeting the basic deformation requirement of deep foundation pit in soft soil areas.