带水平支撑长短桩组合排桩工作性状模型试验研究  

Model tests on work behaviors of retaining piles with different lengths and horizontal support

作　　者：李竹[1] 郑刚[2] 王海旭[2] 

机构地区：[1]天津城投建设有限公司,天津300010 [2]天津大学土木工程系,天津300072

出　　处：《岩土工程学报》2010年第S1期440-446,共7页Chinese Journal of Geotechnical Engineering

基　　金：天津市科技创新专项资金资助项目(07FDZDSF01200)

摘　　要：针对带水平支撑的长短桩组合排桩,在砂土中进行了11组模型试验。在模拟开挖过程中对等长排桩以及长短桩组合排桩的桩身应变和桩身位移进行了测量。对比了相同桩距下等长桩与长短桩组合排桩在不同开挖深度下的桩身应力,以及在不同外加水平荷载下的桩身位移,并分析了长短桩组合排桩随开挖进行的桩身应变规律。研究结果表明,当长短桩中的短桩具有一定的插入深度时,在单点水平支撑条件下,不等长桩与等长桩排桩的水平位移相近,长桩比短桩分担更多的弯矩。条件适宜时,长短桩组合排桩的使用可节约一定工程造价。A new type of contiguous piles with different lengths as retaining structure is developed.Eleven groups of model tests on the new type of retaining piles with horizontal support are performed.The strain and the displacement of the piles are measured during the process of excavation.The behaviors of contiguous piles with the same length for all piles and those with different lengths are compared.The results of model tests show that the capacity of the two types of retaining piles in terms of displacement control is similar when the embedded length of short piles is not too small.This new type of contiguous piles is effective and leads to low cost.

关 键 词：基坑 支护结构 长短桩组合排桩 水平支撑 

分 类 号：TU473.1[建筑科学—结构工程]