背拉板式地下连续墙支护结构设计及优化研究  

Research on structural design and optimizationof underground continous retaining wall with back tension plate

作　　者：杨波[1] 乐茂华[2] 周立[2] 

机构地区：[1]长江水利委员会设计院,湖北武汉430010 [2]深圳市治理深圳河办公室,广东深圳518038

出　　处：《人民长江》2004年第11期33-34,40,共3页Yangtze River

摘　　要：背拉板式地下连续墙为首次在深圳河治理工程采用的新型深基坑支护结构,由墙体、背拉板、插筋、搅拌桩和地基土等5部分组成,具有多种功能,而且施工方便,适应性强,墙体沉降比较均匀,沉降量和倾斜度小。结合工程实践进行研究,提出了其设计要点和优化方向,并进行了多工况比较计算和机理分析,结果表明,插筋的作用明显,背拉板靠近趾部密布插筋比均布插筋更为有效;当背拉板的刚度为地连墙刚度的0.5倍时,结构受力性能较好,工程造价也较合理。An underground continuous retaining wall with a back tension plate was firstly used in the Shenzhen river harnessing project as a new-type support structure of deep foundation pits. This structure consists of wall body, back tension plate, dowel bars, mixed cement-earth piles, and foundation soil, is characterized by its multifunction, extensive adaptability, uniform and small wall settlement, small inclination, and is convenient for construction. This paper deals with this kind of support structure in combination with project practice and puts forward the main points of design and the optimization considerations, also conducts comparative computations and mechanism analyses for several cases. Research results show that the effect of dowel bars is remarkable and a dense dowel bars arrangement near the toe end of the back tension plate is more effective than a uniform dowel bar arrangement along the whole plate, and that when the ratio of the back tension plate's stiffness to the wall's stiffness is (0.5), the stressing behaviors are better and the project cost is also reasonable.

关 键 词：深基坑 地下连续墙 支护结构 设计 优化研究 

分 类 号：TU476.3[建筑科学—结构工程]